usa-reise.de Forum
Unterhaltung & aktuelle Hinweise => Aktuelle Meldungen / Radio- & Fernsehtipps => Thema gestartet von: Daniel am 28.09.2004, 18:53 Uhr
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US-Geologen beunruhigt
Mount St. Helens rumort
Ungewöhnliche Beben am Mount St. Helens im US-Bundesstaat Washington lassen amerikanische Forscher aufhorchen. Möglicherweise sind im Innern des Vulkans Gase explodiert. Im schlimmsten Fall ist auch Lava beteiligt - und ein Ausbruch in naher Zukunft möglich.
http://www.spiegel.de/wissenschaft/erde/0,1518,320469,00.html
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Das sieht der zuständige US Forest Service anders:
http://www.fs.fed.us/gpnf/volcanocams/msh/
"There is no immediate cause for concern beyond the normal awareness that earthquakes and small steam explosions and/or small debris flows are always a possibility in the crater of the volcano."
Nur der Gipfer ist gesperrt.
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Als Vulkaninteressierte bekomme ich regelmäßige Updates.
Vielleicht interessiert das hier jemanden:
Mount St. Helens Daily Update 9/27/04 7:00 PM PDT
Seismic activity has very slowly increased throughout the day. All
earthquake locations are still shallow and beneath the dome. The
largest earthquake recorded in the past 24 hours has been about a M1.5
and no M2 earthquakes have been detected in the past 24 hours.
Cascades Volcano Observatory (CVO) crews installed GPS equipment today
to monitor any ground movement on the dome, crater floor and the
slopes of the volcano. Preliminary results from a gas flight late this
afternoon did not detect any magmatic gas around the lava dome.
For past updates and yesterday's Notice of Volcanic Unrest see past
updates at:
http://vulcan.wr.usgs.gov/Volcanoes/Cascades/CurrentActivity/framework.html
A few photographs of today's fieldwork and of the volcano can be found
on our website can be obtained from:
http://vulcan.wr.usgs.gov/News/framework.html
Daily updates of earthquake data and other information can be found on
the WORLD WIDE WEB at URL:
http://vulcan.wr.usgs.gov/Volcanoes/MSH/CurrentActivity
(CVO Menu - Monthly Summaries and Updates)
and
http://www.pnsn.org/HELENS/welcome.html
Viele Grüße,
Angie
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Hallo Angie,
vielen Dank für den Artikel. Kleiner Hinweis: Vielleicht hinter dem http:// des zweiten Links das Leerzeichen rausnehmen, dann kann man ihn auch anklicken.
Vielen Dank.
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Hallo Thorsten,
danke für deinen Hinweis :!:
Ich habe den Fehler nun korrigiert, war aber nur indirekt meiner, denn ich hatte es kopiert.
Viele Grüße,
Angie
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Hallo Angie
Danke fuer die sehr interessanten Links.
Jetzt weiss ich auch, was Dein Bild darstellen soll. :lol:
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Hallo zusammen,
anscheinend wird es jetzt ernst.....
Mount St. Helens Volcano Advisory (Alert Level Two)
September 29, 2004 10:40A.M., PDT
Over night, seismic activity at Mount St. Helens has accelerated significantly,
which increases our level of concern that current unrest could culminate in an
eruption. We are increasing the alert level to the second of three levels,
which is similar to Color Code Orange of the alert system used by the Alaska
Volcano Observatory and analogous totheNational Weather Service's hazardwatch.
Earthquakes are occurring at about four per minute. The largest events are
approaching Magnitude 2.5 and they are becoming more frequent. All are still at
shallow levels in and below the lava dome that grew in the crater between 1980
and 1986. This suggests that the ongoing intense earthquake activity has
weakened the dome, increasing the likelihood ofexplosions or perhaps the
extrusion of lava from the dome.
The cause and outcome of the accelerating unrest is uncertain. Explosions from
the lava dome could occur suddenly and without further warning. During such
explosions the dome and crater floor are at greatest risk from ballistic
projectiles, but the rim of the crater and flanks of the volcano could also be
at risk. Explosions would also be expected to produce ash clouds that rise
several thousand feet above the crater rim and drift downwind. During today,
wind forecasts from the National Weather Service, combined with eruption
models, show that ash clouds will move in a southeasterly direction and could
dust areas tens of miles or more from the volcano with ash. Landslides and
debris flows from the crater that are large enough to reach the Pumice Plain
are also possible. If the current unrest is being driven by a small slug of
magma at shallow depth, extrusion of lava could also occur. At present there is
no evidence that new gas-rich magma has ascended to shallow levels and could
generate a large sustained eruption. But we are being especially vigilant to
become aware of such evidence should it appear.
We continue to monitor the situation closely and will issue additional updates
as warranted, whether activity escalates or returns to background levels.
Daily updates of earthquake data and other information can be found on the
WORLD WIDE WEB at URL:
http://vulcan.wr.usgs.gov/Volcanoes/MSH/CurrentActivity
(CVO Menu - Monthly Summaries and Updates)
and
http://www.pnsn.org/HELENS/welcome.html
(University of Washington - Earthquake Update)
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see also:
http://story.news.yahoo.com/news?
tmpl=story&cid=578&ncid=578&e=8&u=/nm/20040929/ts_nm/environment_volcano_dc
"Mount St. Helens on Higher Eruption Alert"
excerpt:
SEATTLE (Reuters) - Mount St. Helens could erupt within days, government
scientists said on Wednesday, raising the alert after movement in the volcano's
lava crust was detected following a week of small earthquakes.
Viele Grüße,
Angie
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Es geht immer weiter. Folgenden Artikel habe ich hier (http://de.news.yahoo.com/041001/3/48a7a.html) gefunden.
Zahlreiche Erdbeben am Vulkan Mount St. Helens
Seattle (dpa) - Die Gefahr eines Ausbruchs des Vulkans Mount St. Helens im US-Bundesstaat Washington hat sich am Donnerstag (Ortszeit) weiter verschärft. Wissenschaftler gehen nun mit 70-prozentiger Wahrscheinlichkeit von einer Eruption in den nächsten Tagen oder Wochen aus.
Ein alarmierendes Zeichen sei die immer stärker werdende Serie kleiner Erdbeben, die nun mit einer Häufigkeit von drei bis vier Erdstößen pro Minute gemessen werden. Nach Angaben der Wissenschaftler der Bundesbehörde Geological Survey (USGS) hat sich der Lavadom im Krater des Vulkans seit Montag um mehr als sechs Zentimeter bewegt.
Die Forscher rechnen aber nicht mit einer großen Explosion wie im Jahr 1980, als nach einem stärkeren Erdbeben die Bergspitze weggerissen wurde und eine Aschewolke über 20 Kilometer hoch in den Himmel schoss. 57 Menschen kamen bei dem verheerenden Vulkanausbruch ums Leben. Eine breite Schutt- und Schlammlawine verwüstete hunderte Quadratkilometer Wald.
Die Wissenschaftler halten eine «kleine bis mittelgroße» Explosion für wahrscheinlich, die Asche und Gestein einige Kilometer hoch in die Luft schleudern und damit auch den Flugverkehr beeinträchtigen könnte.
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Aus sicherer Entfernung würde ich solch einen Ausbruch ja gerne mal miterleben. Aber welche Entfernung ist schon sicher? Wohl erst die, aus der man die Urgewalten nicht mehr spürt. :?
@Angie,
wenn du so interessierst bist, hast du schon persönliche Erfahrungen mit Vulkanausbrüchen gemacht?
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@Heinz
mit einem richtigen Vulkanausbruch, also einer Lavafontäne, die weiß Gott wieviele Meter hoch geht, habe ich leider noch keine Erfahrung. Wenn ich die Möglichkeit hätte, würde ich, so wie das Ehepaar Kraft, das allerdings 1991 bei einem Vulkanausbruch ums Leben kam, jedem drohenden Vulkanausbruch hinterher jagen :wink:
Meine bzw. unsere einzigen Erfahrungen beschränken sich auf den seit 1983 aktiven Vulkan Kilauea auf Hawaii bzw. dessen Krater Pu'u O'o. Wir sind auch heuer, so wie in den letzten Hawaii-Urlauben, zum aktiven Lavafluss gewandert und ich muss sagen, es war traumhaft schön. Zeitweise glühte in nur 2 m von uns entfernt die Lava, das dabei hörbare Knistern war fast schon unheimlich und nebenbei war es natürlich sehr heiß, was uns aber weder vom Filmen noch vom Fotografieren abhielt.
Dzt. ist auch der Mauna Loa auf Big Island etwas "unruhig", ich hoffe, er wartet so lange, bis wir wieder kommen. Der Haleakala auf Maui ist ebenfalls überfällig und ein uns bekannter Vulkanologe, der auf der University of Honolulu unterrichtet, hat uns bereits 2001 erklärt, woran man einen "baldigen" Ausbruch des Haleakala erkennen kann. Auf der damals von uns gemachten Wanderung am Skyline Trail konnten wir die Anzeichen tatsächlich sehen.
Nebenbei - das gehört aber nicht zu den USA - habe ich vorhin im TV gesehen, dass der Ätna ausgebrochen ist. Ich bin mal wieder zur falschen Zeit am falschen Ort :cry:
Viele Grüße,
Angie
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Soeben bekam ich wiederum ein Update zum Mount St. Helens:
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Mount St. Helens updates
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U.S. Geological Survey, Vancouver, Washington
University of Washington, Pacific Northwest Seismograph Network, Seattle,
Washington
http://vulcan.wr.usgs.gov/Volcanoes/Cascades/CurrentActivity/
Mount St. Helens Update
October 1, 2004 8:00 A.M., PDT
The alert remains at a Volcano Advisory. The seismic energy level remains
elevated with a rate of 3-4 events per minute and earthquakes as large as
magnitude 3.3. All earthquake locations are still shallow and in or below the
lava dome. Data from a single GPS instrument on the east side of the lava dome
suggest that total movement is ont the order of 7 cm (<3 inches) since Monday.
Such movement is not surprising in light of the high seismicity levels. A USGS
field crew collected additional data from GPS equipment deployed to monitor any
ground movement on the lava dome, crater floor, or lower slopes of the volcano.
A gas flight Thursday again failed to detect any significant volcanic gas, as
was the case on Monday and Wednesday. Today, field crews will use a thermal-
imaging device (FLIR) to look for any thermal anomalies on the dome, and will
install additional seismometers on the flanks of the volcano to enhance our
ability to detect earthquakes. We are examining images of cracks on the crater
glacier to determine how they are related to the current activity. A press
conference will be held Friday at CVO at 9:30 am to update the media.
The current hazard outlook is unchanged from that outlined in Wednesday's
Volcano Advisory.
Confusion regarding Alert Levels resulted in numerous calls to emergency
management agencies from the public about which is the correct level. We are at
Alert Level Two-Volcano Advisory. Explanation of the alert- level scheme can be
found on the "News and Current Events" webpage below.
Our "News and Current Events" webpage now contains "Quick Links" to the current
update, current photos, and the University of Washington Mount St. Helens
seismicity information, plus other useful "Background" webpages on Mount St.
Helens, including an explanation of the Cascade Range alert-level scheme.
========
Mount St. Helens Update
September 30, 2004 5:45 P.M., PDT
The alert remains at a Volcano Advisory. Today the seismic energy level
remained elevated with a rate of 3-4 events per minute and included events as
large as magnitude 3.3. All earthquake locations are still shallow and in or
below the lava dome. Data from a single GPS instrument on the east side of the
lava dome suggest that the site moved a few inches northward Monday and
Tuesday, but has since been stable. Such movement is not surprising in light of
the high seismicity levels. A USGS field crew collected additional data from
GPS equipment deployed to monitor any ground movement on the lava dome, crater
floor, or lower slopes of the volcano. A gas flight today again failed to
detect any significant volcanic gas, as was the case on Monday and Wednesday.
Tomorrow, field crews will use a thermal- imaging device (FLIR) to look for
thermal anomalies on the dome, and will install additional seismometers on the
flanks of the volcano to enhance our ability to detect earthquakes. A press
conference will be held Friday at CVO at 9:30 am to update the media.
The current hazard outlook is unchanged from that outlined in yesterday's
Volcano Advisory. Updated wind forecasts from the National Oceanic and
Atmospheric Administration coupled with an eruption model indicate that the
wind direction are out of the northeast. Therefore any ash clouds produced
today will drift southwestward.
Confusion at yesterday's press briefing at CVO regarding Alert Levels resulted
in numerous calls to emergency management agencies from the public about which
is the correct level. We are at Alert Level Two-Volcano Advisory. Explanation
of the alert- level scheme can be found on the "News and Current Events"
webpage below.
Our "News and Current Events" webpage now contains "Quick Links" to the current
update, current photos, and the University of Washington Mount St. Helens
seismicity information, plus other useful "Background" webpages on Mount St.
Helens, including an explanation of the Cascade Range alert-level scheme.
Viele Grüße,
Angie
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Mount St. Helens eruption
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Mount St. Helens erupted at 12:03pm PDT. The activity continued for about
24 minutes, creating a steam and dust plume that reached about 10,000 feet
elevation and drifted SSW toward Portland, OR and the Pacific coast.
Steam vented from a location at the southern edge of the dome where the
dome edge is covered by glacial ice and debris from the southern crater
wall. On Thursday afternoon N-S linear cracks were observed in the glacier
ice there, implying a slight uplift beneath the ice. Video images of the
eruption showed steam, some possibly superheated, venting from a limited
area and carrying blocks and fines upward into a mostly-white steam plume.
A USGS helicopter flight at the time of the eruption detected no thermal
anomaly with a thermal IR device, implying that this was a steam explosion
only, without magma being directly involved. Live video images taken by
helicopter at roughly 2:00pm PDT show a large hole in the glacial ice at
the edge of the dome, with a layer of gray ash and ejected blocks extending
from it over the ice only toward the SW.
The ongoing seismic activity decreased substantially during the eruption,
but then has rebounded at least slightly since the eruption ceased.
There have been no reported mudflows, but a possibility of slightly
increased flow of water out of the crater.
A USGS team was installing a seismometer on the NW flank of the volcano at
the time, but they were not affected by the event and were not in the path
of the plume.
Presumably an update will soon be posted at:
http://vulcan.wr.usgs.gov/Volcanoes/Cascades/CurrentActivity/
Viele Grüße,
Angie
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Vielleicht interessiert Euch die Webcam am Mt. St. Helens:
Mount St. Helens VolcanoCam (http://www.fs.fed.us/gpnf/volcanocams/msh/)
Gruss,
Mona
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Danke Angie, für die ausführlichen Infos hinsichtlich Mt. St. Helens.
Anette
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Die Web-Cam zeigt nur Bildrauschen. Schade! Der diesmal kalte Ausbruch soll ja schon vorbei sein.
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habe gerade versucht, mir das webcam -Bild anzusehen. Aber das nichtssagende Bild ließ mich fragen, ob dort vielleicht zur Zeit Dunkelheit herrscht und daher die webcam nichts aufnehmen kann. weiß das jemand?
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Sonnenaufgang vor Ort um ca. 7 Uhr 15 Ortszeit. Man kann ab ca. 15.30 Uhr unserer Zeit etwas auf der Page erkennen.
Kann aber auch sein, dass der Server zwischendurch überlastet ist weil zu viele Leute die aktuellen Bilder sehen wollen.
Gruss Eisi
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Jetzt (16.30 Uhr) funktioniert sie. Aber von einem Ausbruch oder aufsteigendem Dampf ist nichts zu erkennen.
Gruss,
Mona
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Heute gegen Mittag sah ich im CNN Filmaufnahmen von der gestrigen Eruption. Auch wenn keine Lava floss, geschweige denn eine Lavafontäne zu sehen war, so war die Asche, die ca. 3 km in die Höhe geschleudert wurde und die Dampfsäule auch ganz schön beeindruckend. Die Dampfsäule war bis in die 80 km entfernte Stadt Portland (Oregon) sichtbar.
Viele Grüße,
Angie
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http://vulcan.wr.usgs.gov/Volcanoes/Cascades/CurrentActivity/
Mount St. Helens Notice of Volcano Alert, October 2, 2004
A notice of Volcano Alert (Alert Level 3) was issued today at 2:00 p.m. PDT
Immediately after the small steam emission at 12:15, seismic activity changed
from principally rock breakage events to continuous low-frequency tremor, which
is indicative of magma movement. We are increasing the alert level to Volcano
Alert the highest alert level indicating that an eruption could be imminent.
The cause and outcome of the accelerating unrest is uncertain. Explosions from
the vent could occur suddenly and without further warning. During such
explosions the dome and crater floor are at greatest risk from ballistic
projectiles, but the rim of the crater and flanks of the volcano could also be
at risk. Explosions would also be expected to produce ash clouds that rise
several to tens of thousands of feet above the crater rim and drift downwind.
Currently wind forecasts from the National Weather Service, combined with
eruption models, show that ash clouds will move to the northwest. If ash
emissions are large, drifting ash could affect downwind communities. Minor
melting of the glacier could trigger debris flows from the crater that are
large enough to reach the Pumice Plain. There is very low probability that
downstream communities would be impacted by these hydrologic events. .
We continue to monitor the situation very closely and will issue additional
updates as warranted, whether activity escalates or returns to background
levels.
===========
Mount St. Helens Update, October 2, 2004, 7:30 A.M.
Current status is Alert-Level 2-Volcano Advisory
Yesterday the increasingly energetic seismic swarm of the past week culminated
in a small 25-miunute-long eruption around noon from a vent just south of the
lava dome. Seismicity dropped to a low level for several hours after the
eruption, but quickly increased with earthquakes reaching a peak around 11 pm
last night. Currently earthquakes are occurring at a rate of 1-2 per minute
with maximum earthquake magnitudes about M3. All earthquake locations remain
shallow. The current level of seismic energy release is slightly above where it
was prior to the eruption yesterday. We infer that the system has
repressurized. As a result, additional steam-and-ash eruptions similar to
yesterdays's could occur at any time.
Yesterday field crews in a helicopter took thermal images of the dome and
crater both during and several hours after the eruption. Temperatures were
consistent with those expected from the steam explosion and well below magmatic
temperatures. Another flight for thermal imagery will occur this morning. A
deformation crew will be in the field today to collect data. Yesterday's gas
flight detected no magmatic gases in the area of the eruptive vent, but did
detect some carbon dioxide (CO2) from a small fumarole on the NW face of the
dome. The amount of CO2 will probably be too small to quantify. At times the
flight crew thought they smelled a weak sulfurous odor in the vicinity of this
fumarole, but the sensors did not detect any SO2 or H2S.
Updated wind forecasts from the National Oceanic and Atmospheric Administration
coupled with an eruption model indicate that the wind direction are from the
east so that any ash clouds produced today will drift westwardly.
There will be a press conference at CVO this morning at 9:30 am.
Viele Grüße,
Angie
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Bericht von heute Morgen - T-Online:
Evakuierung am Mount St. Helens angeordnet
Mount St. Helens spuckt wieder Asche
Aus Angst vor einem Ausbruch des Mount St. Helens haben die US-Behörden am Samstag die Evakuierung der direkten Umgebung des Vulkans angeordnet. Wissenschaftler warnen, der Mount St. Helens im US-Bundesstaat Washington könne innerhalb von 24 Stunden ausbrechen. Hunderte von Besucher des Johnston Ridge Observatoriums mussten ihren Aussichtspunkt rund acht Kilometer vom Krater entfernt verlassen.
Starke Eruption befürchtet
Die Eruption könne stärker als zuvor angenommen sein, berichtete CNN. Ein Ausbruch des Bergs hatte sich am Samstag durch mehrere Beben angekündigt. Der Vulkan stieß den zweiten Tag in Folge Dampf aus. Ein Geologe der US-Bundesbehörde Geological Survey (USGS) sagte, es gäbe Anzeichen für eine Aufwärtsbewegung von Magma.
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Mount St. Helens update
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U.S. Geological Survey, Vancouver, Washington
University of Washington, Pacific Northwest Seismograph Network, Seattle,
Washington
http://vulcan.wr.usgs.gov/Volcanoes/Cascades/CurrentActivity/
Mount St. Helens Update, October 3, 2004, 8:00 A.M.
Current status is Volcano Alert (Alert Level 3); aviation color code RED
Overnight (about 3 am) there was a tremor burst that lasted about 25 minutes.
No eruptive plume was detected as a result of this tremor. Following the
tremor, seismic activity dropped, but now is at a level similar to that before
the tremor burst. Earthquakes are occurring at a rate of 1-2 per minute with
maximum earthquake magnitudes of about M3. All earthquake locations remain
shallow. During yesterday's gas flight, scientists saw an increase in the
number of fumaroles on the lava dome and detected some carbon dioxide. The
total amount awaits further data reduction. Scientists also reported
intermittently the smell of hydrogen sulfide (rotten-egg smell) over the
crater. Data from the GPS instruments on the flanks of the volcano show no
significant changes. Results from the FLIR (thermal imagery) data to date show
no significant thermal anomalies in the crater or on the dome. Scientists will
be in the field today to harden GPS sites, do another FLIR flight, and conduct
another gas flight.
---
"U.S. Warns of Mount St. Helens Eruption"
excerpt:
MOUNT ST. HELENS NATIONAL MONUMENT, Wash. - Scientists kept a watchful eye on
Mount St. Helens Sunday after government officials raised the volcano's alert
level, cleared hundreds of visitors from the area and warned a major eruption
was imminent.
Viele Grüße,
Angie
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Das nächste Update, soeben erhalten:
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Mount St. Helens update
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From: Curtis R Manley <crmanley@mindspring.com>
New steam release & images of Mount St. Helens activity
New Steam Release
Another steam release began at 9:40 am PDT today, October 4, 2003,
generating a steam and ash/dust plume that rose above the summit (to about
10,000 to 11,000 feet altitude) and was carried slowly to the NE by very
gentle winds. Steam releases continued at a lower rate after the initial
release, but after 15-20 muntes the activity ceased. More dust/ash was
released than on October 1, and an ashfall advisory is in effect until 1 pm
PDT for the southern Washington Cascades. Seismicity continued without
interruption through the steam release.
A gentle small steam release also occurred at 10:40 pm PDT October 3, but
it was smaller than the October 1 event. As on Friday, the seismicity
decreased and then resumed afterward.
Visual and GPS observations on October 3 indicates that at least part of
the dome and the glacier adjacent to the dome have been uplifted between 50
and 100 feet.
Current Update at:
http://vulcan.wr.usgs.gov/Volcanoes/Cascades/CurrentActivity/current_updates.htm
l
Online Images
Photographs of the current activity at Mount St. Helens are being posted
online at irregular intervals. These were taken by USGS personnel on the
ground and during helicopter and airplane reconnaissance and sampling
flights. The images clearly show uplift of the dome glacier before the
October 1 steam release. More current images were temporarily available and
may be re-posted.
The images are high quality (1 to 3 megabytes) and so will take
considerable time to download over low-bandwidth connections.
Note that this is an FTP site:
ftp://ftpext.usgs.gov/pub/wr/wa/vancouver/MSH_Images/
Bei mir funktionieren die Links nicht, hoffentlich habt ihr mehr Glück.
Viele Grüße,
Angie
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Leider funktionieren diese Bilder von den letzten Aktivitäten des Mt. St. Helens bei mir auch nicht. Und das aktuelle Bilder (aufgrund des links von Mona auf s. 1) ist immer gleich, wenn nicht gerade Nacht ist, und man nichts sieht.
Trotzdem verfolge das Ganze mit großem Interesse, da ich zwei mal vor Ort war (1990 und 1997) und die enorme Veränderung durch die nachwachsende Natur sehr beeindruckend fand.
Auch bezüglich der Veränderungen durch die derzeitige Vulkantätigkeit bin ich richtig neugierig. Gibt es da schon Bilder von?
grüße von
ursel-grete
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Hallo ursel-grete,
sieh' dir mal diesen Link an:
http://www.msnbc.msn.com/id/6092368/
Scrolle ein wenig nach unten, dann findest du auf der linken Seite einen kleinen Videofilm von gestern. Das Laden dauert bei mir trotz DSL ein wenig, also Geduld und dann nochmal Geduld, denn vor dem Mt. St. Helens-Video kommt Werbung :wink:
Viele Grüße,
Angie
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Danke Angie, jetzt habe ich eine ganze Reihe von Dias gesehen, die in den letzten Tagen gemacht wurden. Spannend, was sich da so tut. Ich bin gespannt auf den weiteren Verlauf.
Die Videos konnte ich leider nicht gucken, da die computersoftware nicht mit der von NBC kompatibel ist. Aber macht nichts, die bilder waren schon eindrücklich genug.
Danke für alle die Tipps und Infos, die du zum Mt. St. Helens mir (und anderen) zugänglich machst.
Viele Grüße
ursel-grete
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Hallo,
ich war 1996 am Mt. St. Helens und bin mit dem Hubschrauber über den Krater geflogen.
Es ist jetzt ein richtig eigenartigs Gefühl wenn ich mir die Bilder von damals anschaue.
Bin gespannt wie es weitergeht. Hoffenlich kommt niemand zu Schaden.
Gruß
Bettina
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Hallöchen an alle Interessierten,
sobald ich das nächste Update bekomme, werde ich es ehestmöglich hier posten.
@ursel-grete
Auch ich bin gespannt, wie es weiter geht. Schade, dass du das Video nicht ansehen konntest, war/ist schon echt beeindruckend.
@BettinaW
Ich glaube dir aufs Wort, dass es für dich ein eigenartiges Gefühl ist, wenn du for 8 Jahren über den Mt. St. Helens geflogen bist und die damaligen Bilder mit den jetzigen vergleichst. Uns geht es mit dem Pu'u O'o auf Hawaii genauso - der Hubschrauberflug über dem aktiven Pu'u O'o von 2001 hatte mit dem diesjährigen Heli-Flug nicht viel Gemeinsames. Der Krater hat sich in den 3 Jahren so verändert, unglaublich.
Viele Grüße,
Angie
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Auf dem Foto der Webcam ist inzwischen deutlich mehr Dampf zu sehen. Es scheint so, als ob sich die Lage verschärft.
Gruss,
Mona
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Webmaster Update - October 05, 2004 at 12:30 pm PDT - We will soon make available here a number of VolcanoCam images of eruptions from last Friday, yesterday and today. We also have a VolcanoCam movie of Friday's first eruption we will post here soon.
You may notice a greater time difference between your computer's time clock and the time stamp on the VolcanoCam images. We implemented a five minute cache on the web server to help reduce the overload. So while images may be ten to 15 minutes behind real-time (instead of just five minutes), we significantly increase the opportunities you will see regular image updates here and not receive the dreaded "File Not Found" error message caused by a server overload.
We apologize for the tardiness of any VolcanoCam web page updates. Please understand our first priority is making sure the VolcanoCam continues to operate. We are inundated with phone calls and emails, as well as performing our normal web updates.
We remain in close contact with USGS/Cascades Volcano Observatory, in Vancouver, Washington and the University of Washington Pacific Northwest Seismograph Network.
For the latest information, check our Special Conditions Report for any current activity.
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Mount St. Helens update
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Larger Steam and Ash Release at Mount St. Helens
A steam release began at 9:03 am PDT today, October 5, 2003, generating a
steam and ash plume that completely filled the crater and rose above the
summit (to about 12,000 to 13,000 feet altitude) and was carried to the NNE
by the prevailing wind. Steam and ash release continued for roughly an
hour. More ash was released than on October 4, and an ashfall advisory was
in effect until 2 pm PDT for the southern Washington Cascades, but then was
cancelled around noon as the plume dispersed. Light ashfall was reported in
several small communities downwind. Seismicity decreased significanly
during and after the event but did not cease.
After the air in the crater cleared, it was possible to see the Oct. 1 vent
in the glacial ice adjacent to the southern edge of the dome. The vent has
widened and is filled with a meltwater pond about 120 feet across filled
with floating ice blocks and possibly bubbling with gas. The water itself
is not boiling.
Uplift has continued at the interface of the glacier and dome immediately
East of the Oct. 1 vent. Estimates by the USGS are that this portion of the
dome has been uplifted about 150 feet since the beginning of the current
unrest. A new, vigorous fumarole has developed in a small vent on the dome
just North of the Oct. 1 vent.
Todays ash will be sampled and analyzed for a juvenile magmatic component.
Viele Grüße,
Angie
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*************************
Mount St. Helens updates
*************************
U.S. Geological Survey, Vancouver, Washington
University of Washington, Pacific Northwest Seismograph Network, Seattle,
Washington
Mount St. Helens Alert Level Change
Past Alert Level: Volcano Alert (Alert Level 3); aviation color code RED
New Alert Level: Volcano Advisory (Alert Level 2); aviation color code ORANGE
October 6, 2004 9:15 A.M., PDT
Following yesterday morning's steam-and-ash eruption, seismicity dropped to a
low level and has remained low. Low-level tremor observed following the
eruption is also gradually declining. Lack of earthquake and rockfall signals
suggest that deformation of the uplift area on the south side of the 1980-86
lava dome has slowed. Brief visual observations this morning from Coldwater
Visitor Center showed weak steam emissions from the crater. We infer that the
vigorous unrest of the past few days has lessened and that the probability of
an imminent eruption that would endanger life and property is significantly
less than at any time since Saturday, October 2, when the alert level was
raised to Volcano Alert (Level 3). Therefore, we are lowering the alert level
to Volcano Advisory (Alert Level 2).
Such decreases in the level of unrest, which may reflect a decrease in the rate
of magma movement, have been common at Mount St. Helens during eruptions in
1980-86 and also at similar volcanoes elsewhere. Episodic changes in level of
unrest over periods of days to weeks, or even months, are possible. We don't
think that the current episode of unrest is over and we expect fluctuations in
the level of unrest to continue during coming days and months. Everyone should
be aware that escalation in unrest and perhaps an eruption could occur suddenly
or with very little warning. There may be little time to raise the Alert Level
before a hazardous event occurs. Therefore, we continue to monitor the
situation closely and will issue additional updates and changes in Alert Level
as warranted.
------
Mount St. Helens Update, October 6, 2004, 7:00 a.m, PDT
Current status is Volcano Alert (Alert Level 3); aviation color code RED
Seismicity overnight has remained at very low levels. After the vigourous steam-
and-ash emission of yesterday morning, seismicity dropped with individual
events becoming smaller. By about 5 p.m. PDT yesterday, individual events
became rare and as of 11:00 p.m., seismicity has been stable at a low level.
Yesterday, field crews continued to harden GPS sites for the approaching winter
and retrieved data. The GPS sites on the dome survived the steam-and-ash
emission and data are being received and processed at the observatory. The
station on the northern flank of the dome, shows a trend of northward
displacement totaling 2 cm in the last three days. This is the same sense of
movement recorded by the nearby station that was destroyed by the first steam-
and-ash emission on 1 October. Data from the other two stations on the dome,
which were installed on 4 October are currently being analyzed. Data from GPS
instruments on the outer flanks of the volcano show no movement of the outer
flanks.
No gas measurements were made yesterday. A seismic crew installed an additional
broadband seismometer on the northwest flank of the volcano which will help
show a broader range of seismic energy release. With the help of the U.S.
Forest Service, field crews installed an antenna mast for a VSAT uplink which
will improve our ability to retrieve data from the field.
It began raining t the mountain at about 7:30 p.m. PDT. By about 9:30 p.m.
about 0.1 inch of rain had fallen. Overnight, the acoustic flow monitoror (AFM)
in the crater indicated that several small debris flows had moved past the
site. By midnight, higher flows were recorded at a station on the pumice plain,
but none were large enough to trigger an automatic alert. We expect these types
of flowage events to recur during intense rainstorms.
Wind forecasts from the National Oceanic and Atmospheric Administration (NOAA),
combined with eruption models, show winds this morning are from the west-
southwest such that any ash clouds will drift to the east-northeast.
We continue to monitor the situation closely and will issue additional updates
and Alert Level changes as warranted.
Press conferences will continue to be held at the Headquarters office of the
Gifford Pinchot National Forest. The morning press conference is at 9:30 AM. If
activity remains low, we will do a show-and-tell of some of the instruments
were are using to monitor the volcano at the press conference.
Viele Grüße,
Angie
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10. Oktober 2004
Neuer Dampf vom Mount St. Helens
10. Oktober 2004 Der Vulkan Mount St. Helens hat am Sonntag eine neue Dampfwolke aus seinem Krater geschleudert. Dunkler Rauch stieg gut 100 Meter über dem Berg im amerikanischen Staat Washington auf. Ob darin auch Asche enthalten war, konnten die Geologen vor Ort zunächst nicht feststellen.
Sie registrierten aber seit Samstag zunehmende Erderschütterungen im Bereich des rund 2.550 Meter hohen Vulkans. Alle ein bis zwei Minuten komme es zu Erdstößen bis zur Stärke von 2,4 auf der Momentmagnitude, erklärten die Wissenschaftler, die seit dem 23. September schon Tausende kleine Erdbeben gemessen haben. Ihrer Ansicht nach gibt es aber keine Anzeichen, daß eine größere Eruption unmittelbar bevorsteht.
Die Alarmstufe wurde deshalb auch nicht angehoben, doch wurden seit Anfang Oktober schon Tausende Anrainer evakuiert. Auf der Südseite des Vulkans wurde eine Lavablase beobachtet, die inzwischen auf mindestens 100 Meter anwuchs.
Die jüngsten Aktivitäten des Mount St. Helens waren die stärksten seit 18 Jahren. Ein etwaiger Ausbruch würde nach den Vermutungen der Wissenschaftler allerdings weit schwächer ausfallen als der vom 18. Mai 1980. Damals wurden 57 Menschen getötet, und die Wucht der Eruption riß etwa 390 Meter von der Vulkanspitze weg.
Text: FAZ.NET mit Material von AP
Bildmaterial: AP, Reuters
Neuigkeiten per Mail von Lisa Koenig habe ich leider dzt. nicht.
Viele Grüße,
Angie
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Mt. St. Helens update 13. 10., 23:53:
Following a steam-and-ash emission at St. Helens on 5 October, seismicity dropped to low levels and CVO reduced the warning from Volcano Alert (Alert Level 3: aviation color code Red), to Volcano Advisory (Alert Level 2: aviation color code Orange). During 6-12 October, seismicity was at low-to-moderate levels, with the highest magnitude earthquakes (M 2.4) occurring at a rate of one every 2 minutes on 8 October.
On 6 October only weak steam puffs were emitted from the volcano and CVO scientists confirmed that the top of the area of intense uplift was at or slightly above the highest point on the lava dome, which suggested that some uplift occurred during the period of low seismicity. Scientists also confirmed that small lahars spilled out of the crater and onto the Pumice Plain during a rainstorm the evening of 5 October. Lahars traveled a short distance toward Spirit Lake and the North Fork Toutle River. CVO received reports that a light dusting of ash from the emission on 5 October affected the eastern part of Mount Rainier National Park, ~110 km NNE of St. Helens. A new steam vent opened during the evening of 6 October, joining two that had been present for several days.
Measurements from recent photographs and LIDAR (LIght Detection And Ranging) showed that as of 7 October the intensely deformed and uplifted area on the S side of the 1980-86 lava dome was ~400 m (N-S) by ~490 m (E-W) with a maximum uplift of about 90-120 m. Additional analysis revealed that the total volume change represented by the deformation between late September and 6 October was ~16 million cubic meters. The average rate of change was ~2 million cubic meters per day. On 11 October, thermal imaging of the western part of the uplifting area revealed temperatures of 500 to 600 degrees C on a large pinkish-gray fin of rock and in nearby fumaroles and cracks. These observations are consistent with new lava having reached the surface of the uplift. A gas-sensing flight on 11 October measured fluxes of sulfur dioxide and carbon dioxide that were similar to, or slightly smaller than, those measured on 7 October.
CVO reported on 13 October, "As a result of the intense unrest of the past two and one-half weeks and recent observations, we infer that magma is at a very shallow level and is extruding onto the surface. Incandescence from hot rock or gases reflects off steam clouds and is visible from north of the volcano.
During times of unrest, Mount St. Helens and similar volcanoes elsewhere typically go through episodic changes in level of unrest over periods of days to weeks, or even months. Such changes are in part driven by variations in the rate of magma movement. We expect fluctuations in the level of unrest to continue during coming days. Escalation in the degree of unrest could occur suddenly or with very little warning. There may be little time to raise the alert level before a hazardous event occurs."
Background. Prior to 1980, Mount St. Helens formed a conical, youthful volcano sometimes known as the Fuji-san of America. During the 1980 eruption the upper 1,400 m of the summit was removed by slope failure, leaving a 2 x 3.5 km horseshoe-shaped crater now partially filled by a lava dome. Mount St. Helens was formed during nine eruptive periods beginning about 40-50,000 years ago, and has been the most active volcano in the Cascade Range during the Holocene.
The modern edifice was constructed during the last 2,200 years, when the volcano produced basaltic as well as andesitic and dacitic products from summit and flank vents. Historical eruptions in the 19th century originated from the Goat Rocks area on the N flank, and were witnessed by early settlers.
Viele Grüße,
Angie
-
Update vom 22. 10. 04, 9:54:
During 13-18 October, seismicity was at low levels at St. Helens and growth of the new lava dome inside the volcano's crater continued. Gas-sensing flights on 13 October detected low levels of sulfur dioxide and hydrogen sulfide, but no carbon dioxide. Measurements of flow rate and temperatures in streams draining the crater showed no significant change from late September values. On 14 October, visual observations and thermal imaging of the crater showed enlargement of both the section of intense deformation and uplift on the S side of the 1980-86 lava dome, and the new lobe of lava in the W part of that area.
Temperatures of almost 700 degrees C were measured in parts of the new lobe from which ash-rich jets rose tens of meters. Abundant steam continued to rise from the area of lava extrusion to the crater rim, where it dispersed southwestward in strong winds. On the 14th only sulfur-dioxide flux was detected, and there was no detectable carbon dioxide or hydrogen sulfide.
Thermal imaging showed slow extrusion of lava continuing on the 14th. Global Positioning System (GPS) measurements on 15 October continued to indicate only minor deformation of the northern part of the 1980-86 dome and no deformation of the volcano's outer flanks. Parts of the area of uplift and new lava dome were higher than when previously seen on 14 October. On the evening of 16 October, rainfall triggered a small debris flow that traveled N from the crater and changed rapidly into a muddy stream flow within 5 km of the volcano.
Through 18 October, the level and character of seismicity was consistent with a continuing rise of magma driving uplift of the crater floor and feeding the surface extrusion of lava. According to CVO, low rates of seismicity and gas emission suggested that the lava reaching the surface was gas poor.
CVO stated on 18 October that as long as this eruption is in progress, episodic changes in the level of activity can occur over days, weeks, or even months.
Increase in the intensity of eruption could occur suddenly or with very little
warning and may include explosive events that produce hazardous conditions within several kilometers of the volcano. Small lahars (volcanic debris flows) could suddenly descend the Toutle River valley if triggered by heavy rain or by interaction of hot rocks with snow or glacier ice. These lahars pose a negligible hazard below the Sediment Retention Structure (SRS), but could pose a hazard to people along the river channel upstream of the SRS. At this time of year, it is not unusual for rivers draining the volcano to contain high concentrations of sediment that turn the water murky. Although considered less likely at this time, the current eruptive activity could evolve into a more explosive phase that affects areas farther from the volcano and sends significant ash thousands of feet above the crater where it could be a hazard
to aircraft and to downwind communities.
Viele Grüße,
Angie
-
Update 27. 10. 04, 20:30 pm bei mir eingelangt:
MOUNT ST. HELENS VOLCANO
Current status is Volcano Advisory (Alert Level 2); aviation color code
ORANGE
Growth of the new lava dome inside the crater of Mount St. Helens continues. As long as this eruption is in progress, episodic changes in the level of activity can occur over days, weeks, or even months. Increase in the intensity of eruption could occur suddenly or with very little warning and may include explosive events that produce hazardous conditions within several miles of the volcano. Small lahars (volcanic debris flows) could suddenly descend the Toutle River valley if triggered by heavy rain or by interaction of hot rocks with snow or glacier ice. These lahars pose a negligible hazard below the Sediment Retention Structure (SRS), but could pose a hazard to people along the river channel upstream of the SRS.
At this time of year, it is not unusual for rivers draining the volcano to contain high concentrations of sediment that turn the water murky.
Although considered less likely at this time, the current eruptive activity could evolve into a more explosive phase that affects areas farther from the volcano and sends significant ash thousands of feet above the crater where it could be a hazard to aircraft and to downwind communities.
Wind forecasts from the National Oceanic and Atmospheric Administration (NOAA), coupled with eruption models, show that ash clouds that rise above the crater rim today would drift southwest from the volcano.
Seismicity remains at a low level compared to that observed early in this unrest. The current seismicity is consistent with a continuing, slow rise of magma driving uplift of the crater floor and feeding a surface extrusion of lava. The overall low rates of seismicity and gas emission suggest that the lava reaching the surface is gas poor, thereby reducing the probability of highly explosive eruptions in the near term.
Samples of the new dacite lava collected on 20 October are mostly similar chemically and texturally to lava erupted during the late period of dome growth in the 1980's (1984-1986). This is consistent with slow rise, degassing, and cooling of magma within the volcano's conduit. However, a minor component of the 10/20/04 sample has textures and mineral compositions indicative of rapid ascent of magma from a region at greater depth and greater temperature (900º C).
Crews did not go to the field yesterday, but field work including geologic and thermal-imaging observations, a gas-measurement flight, and telemetry maintenance is under way.
The U.S. Geological Survey and the University of Washington continue to monitor the situation closely and will issue additional updates and changes in alert level as warranted.
For additional information, background, images, and other graphics:
http://vulcan.wr.usgs.gov/News/framework.html
Viele Grüße,
Angie
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Hi an alle Interessierten,
soeben bekam ich einen Bericht vom Mt. St. Helens Ausbruch 1980. Ich weiß nicht, ob das jemanden interessiert, ich stelle es einfach mal in diesen Thread.
„Vancouver, Vancouver, this is it!“
Am 18. Mai 1980 explodierte der Mount St. Helens. Rückblick auf ein Ereignis, das sich jederzeit wiederholen kann.
Sonntag, 18. Mai 1980. Noch vor Sonnenaufgang beginnt die tägliche Routine. Ein Flugzeug der „Oregon National Guard“ überfliegt den Vulkan und macht Infrarotaufnahmen. Die Entwicklung der Filme und die Auswertung der relativen Temperaturverteilung der Oberfläche wird noch einige Stunden dauern; die Ergebnisse aber werden nicht mehr relevant sein. Die Seismizität in den frühen Morgenstunden ist moderat, ohne besonderen Befund.
Am ständig besetzten Beobachtungsstützpunkt „Coldwater II“, 9,2 Kilometer nordnordwestlich des Gipfels und innerhalb der Sperrzone, unternimmt der Geologe David Johnston seine morgendlichen Laser-Distanzmessungen von der sich in den letzten Wochen ständig weiter aufblähenden Nordflanke und sendet diese gegen 7 Uhr nach Vancouver: keine signifikanten Veränderungen.
Der Himmel über der Region ist wolkenlos. Hobby-Angler, einige Waldarbeiter und andere Frühaufsteher erfreuen sich der klaren Luft und einer warmen Brise aus Westen. Manche der Amateurbeobachter und -funker sind bereits auf ihren Posten, ausserhalb der roten Sperrzone. Unter ihnen Gerald Martin, einen Höhenzug weiter weg als Johnston, Position 11,5 km N, der Photograph Reid Blackburn vom „Vancouver Columbian“, der einen Auftrag für das Magazin „National Geographic“ in der Tasche hat, Position 13,7 km NW, Robert Rogers und die Kearneys, allesamt Amateurfunker, Position 12,2 km W sowie Gary Rosenquist, Amateurfotograph, und in seiner Nähe Keith Ronnholm, Geophysiker, Position 17,6 km NE.
Die Geologen Keith und Dorothy Stoffel, die gerade in der Gegend von Spokane arbeiten und an einer Konferenz in Yakima teilnehmen, entscheiden sich kurzfristig, nachdem ihnen eine Überflugerlaubnis erteilt wurde, den Vulkan aus der Luft zu beobachten. Um 7 Uhr 15 chartern sie in Yakima ein Flugzeug.
Etwa um 7 Uhr 50 dringen sie in den gesperrten Luftraum ein. Mehrmals umkreisen sie im Uhrzeigersinn die Gipfelregion und machen Beobachtungen und Photos. Beim vierten und letzten Überflug gegen halb neun sehen sie zunächst, wie Fels- und Eisblöcke des Gipfels vom Rand in den Innenkrater stürzen. Sekunden später beobachten sie, wie die gesamte Nordflanke des Berges in Bewegung gerät, durchgeschüttelt wird, sich kräuselt und dann in nördlicher Richtung auf den Spirit Lake zu hinab gleitet. Sie hatten die Initialsekunden eines gigantischen Bergsturzes miterlebt. Jetzt folgen die ersten Eruptionswolken, zunächst am unteren Ende der nun exponierten Erdrutsch-Gleitfläche, dann weiter oben, unterhalb des Gipfels; sie wachsen extrem schnell zu unglaublichen Dimensionen heran.
Um 8 Uhr 32 hat ein Erdbeben der Stärke 5,2 den Bergsturz ausgelöst. Etwa 20 bis 30 Sekunden später folgt die heftige, lateral nordwärts gerichtete Explosion. Am Boden ist Johnston mit der Erste, der den Bergrutsch wahrnimmt. Er schreit in sein Funkgerät: „Vancouver, Vancouver, this is it!” Ein weiterer Satz ist zu verstümmelt, als dass er verstanden werden könnte. Wegen atmosphärischer Störungen erreicht die Warnung nicht das Zentrum in Vancouver, andere Amateurfunker nehmen seine Nachricht auf.
Ein Naturlabor
Die katastrophischen Ereignisse und Prozesse rund um den Vulkanausbruch, hinterfragen unsere Denkweise über das Erdgeschehen. Verändert sich die Erde durch langsame und graduelle Prozesse, die durch Akkumulation im Verlauf langer Zeiträume kleine Änderungen bewirken? Oder haben rasche Prozesse innerhalb kürzester Zeit deutliche geologische Veränderungen hervorgerufen?
Die Geologie ist eine historische und keine exakte (Natur-)Wissenschaft. Die in der Vergangenheit abgelaufenen, grossräumigen oder gar globalen Prozesse der Veränderung der Erdkruste wiederholen sich in den wenigsten Fällen. Sie sind nicht reproduzierbar wie wir es beispielsweise aus der Physik kennen. Auch gibt es kein Testlabor der Grösse Erde. Aber geologische Ereignisse wie der Ausbruch des Mount St. Helens haben die Funktion und Grösse eines Miniatur-Labors.
So gesehen ist der Mount St. Helens ein Anschauungsobjekt aller erster Güte; doch nicht wegen seiner Eruption alleine, sondern wegen einer ungewöhnlichen Konzentration vielfältigster und auch bis dahin nie in diesem Spektrum beobachteter rascher Erosions- und Sedimentationsprozesse und dem Wissen, wie diese abgelaufen sind.
Obwohl der Ausbruch erwartet worden war, haben viele Wissenschaftler und Behörden die Dynamik der Eruption und seine Folgen unterschätzt. 57 Menschen kamen ums Leben. Auch daraus lässt sich ableiten, dass die geologischen Erkenntnisse über katastrophische Vorgänge noch unzureichend sind und deren Auftreten in der Erdgeschichte noch nicht ausreichend erforscht ist.
Es glich einer Kettenreaktion: Eingeleitet wurde die Explosion des Mount St. Helens durch ein Erdbeben und einen Erdrutsch, bei dem rund zwei Kubikkilometer Material bewegt wurden. Das Abgleiten des Gipfels und des Nordhangs senkte den Druck innerhalb des Vulkans, wobei sich überkritisches Wasser schlagartig in Dampf umwandelte. Die nordwärts gerichtete Dampfexplosion setzte ein Energieäquivalent von 20 Millionen Tonnen TNT frei; dabei wurde eine Waldfläche von fast 400 km2 umgeknickt.
Die pilzförmig heranwachsende Eruptionssäule stieg bis in 20 Kilometer Höhe auf. Die Magmenkammer im gipfelnahen Reservoir wurde durch die pausenlos explodierenden und hochschiessenden Gas- und Aschesäulen nach und nach entleert.
Die nach Osten über mehrere Bundesstaaten driftenden Aschewolken verfinsterten im Laufe des Tages ganze Regionen. Rund 150 Kilometer vom Mt. St. Helens entfernt verfinsterte sich in der Stadt Yakima (Bundesstaat Washington) am 18. Mai um die Mittagszeit der Himmel. Die Strassenbeleuchtung schaltete sich automatisch an. Die erste Lage des Aschenregens bestand aus “Salz und Pfeffer”. Das waren sandkorngrosse Teilchen von dunklem Gestein und helleren Feldspatfragmenten, über die sich eine dickere Schicht aus staubkorngrossen Glasteilchen legte.
30 Kilometer nördlich von Yakima lagerte sich die Asche mit ca. 20 mm Mächtigkeit ab. In der 330 Kilometer entfernten Stadt Ridswill erreichte die Aschenlage über 70 mm. Selbst in der 430 Kilometer vom Vulkan entfernten Stadt Spokane, wo lediglich 5 mm Asche fielen, wurde es um 15 Uhr finster, so dass die Sichtweite auf 3 Meter sank. Schlammströme verwüsteten über Dutzende von Kilometern - auch weit abseits der Explosionszone - Flüsse und Täler.
Gegen Abend klang die Eruptionstätigkeit ab. Während des neunstündigen Ausbruchs hatte der Vulkan eine Energie freigesetzt, die 400 bis 430 Millionen Tonnen TNT entsprach. Das ist vergleichbar mit der Gewalt von 20.000 Hiroschima-Atombomben. Die gesamte Nordflanke des Mount St. Helens war weggesprengt. Der Vulkan hat 400 Höhenmeter eingebüsst (von 2950 m auf 2550 m); ein Areal von 600 km2 war vollkommen verwüstet.
Viele Grüße,
Angie
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Mich interessiert das :P Ich verfolge auch Deine Updates immer mit. Momentan scheint sich am Vulkan nicht viel zu tun.
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Hi Angie,
ich schau auch immer rein- danke für Deine Informationen. :D
Wir waren schon einige Male dort und vielleicht nächsten Sommer wieder- mal sehen, was bis dahin so passiert.
Tschüß
Karin
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Hallo Mel und Karin,
dann war meine "Mühe" doch nicht ganz umsonst :wink:
Viele Grüße,
Angie
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Hi Angie
Nein, Deine Mühe war garantiert nicht umsonst. Auch ich verfolge das Geschehen am St.Helens. War selbst schon mehrmals da. Vulkane sind halt einfach etwas schönes.
Gruss Eisi
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Hi Eisi,
Vulkane sind halt einfach etwas schönes.
Du sprichst mir aus der Seele :D
Ich habe mir gerade zum x-ten Mal unseren diesjährigen Heli-Flug über den aktiven Pu'u O'o angesehen :D Muss jetzt direkt überlegen........ Wenn wir heute schon nach Frankfurt fliegen, warum dann nicht gleich weiter nach Hawaii :?: :D :D
Viele Grüße,
Angie
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Hi Angie,
wir wollen wahrscheinlich 2006 nach Hawaii- wegen der Vulkane. :wink:
Ich werde Dein Wissen bis dahin noch anzapfen müssen..... :D
Aber den Mt St Helens finden wir auch sehr aufregend und haben in den letzten Jahren von beiden Seiten das Neuwachstum der Vegetation und des Hügels im Krater verfolgt. Den Film kennen wir natürlich auch.
Bitte schreib weiter, was Du herausfindest.
Tschüß
Karin
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@Anne
wir wollen wahrscheinlich 2006 nach Hawaii- wegen der Vulkane.
Ich werde Dein Wissen bis dahin noch anzapfen müssen.....
Du kannst mein Wissen über Hawaii gerne anzapfen :wink: Dann werden wir sehen, ob ich die Prüfung bestehe oder nicht :wink:
Viele Grüße,
Angie
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So, weiter geht's mit dem Mt. St. Helens:
05 Nov 04 MSH Update
U.S. Geological Survey, Vancouver, Washington University of Washington, MOUNT ST. HELENS VOLCANO
Current status is Volcano Advisory (Alert Level 2); aviation color code ORANGE
Growth of the new lava dome inside the crater of Mount St. Helens continues. As long as this eruption is in progress, episodic changes in the
level of activity can occur over days, weeks, or even months. Increase in the intensity of eruption could occur suddenly or with very little warning and may include explosive events that produce hazardous conditions within several miles of the volcano. Small lahars (volcanic debris flows) could suddenly descend the Toutle River valley if triggered by heavy rain or by interaction of hot rocks with snow or glacier ice. These lahars pose a negligible hazard below the Sediment Retention Structure (SRS) but could pose a hazard to people along the river channel upstream of the SRS. At this time of year, it is not unusual for rivers draining the volcano to contain high concentrations of sediment that turn the water murky.
Although considered less likely at this time, the current eruptive activity could evolve into a more explosive phase that affects areas farther from the volcano and sends significant ash thousands of feet above the crater where it could be a hazard to aircraft and to downwind communities.
Wind forecasts from the National Oceanic and Atmospheric Administration (NOAA), coupled with eruption models, show that ash clouds that rise above the crater rim today would drift westward to southwestward.
Visibility is excellent and likely will remain so throughout the day. A steam plume is rising passively and drifting south and southwestward over the crater rim. The plume occasionally contains minor ash, which falls out in the crater and on the southern flank of the volcano, darkening the new snow.
Seismicity remains at a low level compared to that observed early in this unrest. The current seismicity is consistent with a continuing, slow rise of magma driving uplift of the crater floor and feeding a surface extrusion of lava. The overall low rates of seismicity and gas emission suggest that the lava reaching the surface is gas poor, thereby reducing the probability of highly explosive eruptions in the near term.
Crews were in the field yesterday, the first opportunity following a spate of inclement weather. Their findings:
Sulfur dioxide (SO2) emission rates continue to be low and consistent with previous measurements. No hydrogen sulfide (H2S) was detected. Ash in the steam plume prevented an accurate measurement of carbon dioxide (CO2).
The elongated new dome, which extends southward from the 1980-1986 dome, has undergone substantial vertical growth since October 27. A new mass of dacite has extruded upward by as much as 100 m. Exposed rock faces have temperatures in the range 400-500 degrees Celsius, creating the incandescence that may be seen from the north on clear nights. Field crews conducted geologic observation flights in the crater. To collect samples they landed a helicopter on the new dome for the second time in two weeks.
The new dacite lava contains visible crystals of plagioclase, hornblende and hypersthene. These samples are similar to those collected on October 27 and also to lava erupted at Mount St. Helens in the 1980s.
The steep new faces on the dome are generating small hot rockfalls and avalanches within the crater. The finer particulate from these deposits roils upward within the steam plume, rising to about 11,000 ft altitude, or about 2,600 ft above the crater rim. Consequently the south and southwest flank of the volcano have received a notable dusting of ash. This localized ash poses no threat beyond the near slopes of the volcano.
Most dome growth has been vertical, with only about 30 m of outward growth in some directions. The thick glacial ice that forms a buttress on the south and east sides of the dome remains largely intact. All dome growth is contained within the Mount St. Helens crater.
A continuous GPS station north of the volcano at Johnston Ridge Observatory has moved to the south by about 2 cm since late September or early October.
This slow shift may reflect a depletion of magma in the subsurface at 5-10 km depth. To confirm this result, five new GPS receivers were positioned around the volcano's flanks 5-10 km from the crater to better track hanges in the deeper parts of the magmatic system. Two additional units will be deployed today.
Viele Grüße,
Angie
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Nächstes Update:
**************************
Mount St. Helens updates
**************************
08 Nov 04 MSH Update
MOUNT ST. HELENS VOLCANO
Current status is Volcano Advisory (Alert Level 2); aviation color code ORANGE
Growth of the new lava dome inside the crater of Mount St. Helens continues, and is accompanied by intermittent emissions of steam and ash.
As long as this eruption is in progress, episodic changes in the level of activity can occur over days, weeks, or even months. Increase in the intensity of eruption could occur suddenly or with very little warning and may include explosive events that produce hazardous conditions within several miles of the volcano. Small lahars (volcanic debris flows) could suddenly descend the Toutle River valley if triggered by heavy rain or by interaction of hot rocks with snow or glacier ice. These lahars pose a negligible hazard below the Sediment Retention Structure (SRS) but could pose a hazard to people along the river channel upstream of the SRS. At this time of year, it is not unusual for rivers draining the volcano to contain high concentrations of sediment that turn the water murky.
Although considered less likely at this time, the current eruptive activity could evolve into a more explosive phase that affects areas farther from the volcano and sends significant ash thousands of feet above the crater where it could be a hazard to aircraft and to downwind communities.
Wind forecasts from the National Oceanic and Atmospheric Administration (NOAA), coupled with eruption models, show that ash clouds that rise above the crater rim today would drift northward to northeastward depending on their altitude.
Visibility is excellent and likely will remain so throughout the day. A steam plume is rising passively and drifting northward out of the crater. The plume occasionally contains minor ash, which falls out in the crater and on the flank of the volcano, darkening the snow.
Seismicity remains at a low level compared to that observed early in this unrest. The current seismicity is consistent with a continuing, slow rise of magma driving uplift of the crater floor and feeding a surface extrusion of lava. The overall low rates of seismicity and gas emission suggest that the lava reaching the surface is gas poor, thereby reducing the probability of highly explosive eruptions in the near term.
Aerial observations yesterday showed that the new dome continues to expand and move upward. Small aprons of rockfall debris are accumulating at several sites around the new dome. Some ash emissions may be caused by these rockfalls as collapsing hot dome lava disintegrates into smaller fragments. No field investigations are planned for today.
see also:
http://story.news.yahoo.com/news?tmpl=story&cid=519&e=15&u=/ap/mount_st__helens
Viele Grüße,
Angie
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MOUNT ST. HELENS UPDATE
Current Volcano Alert Level WATCH ; Aviation Color Code ORANGE : Growth
of the new lava dome inside the crater of Mount St. Helens continues,
accompanied by low rates of seismicity, low emissions of steam and
volcanic gases, and minor production of ash. During such eruptions,
changes in the level of activity can occur over days to months. The
eruption could intensify suddenly or with little warning and produce
explosions that cause hazardous conditions within several miles of the
crater and farther downwind. Small lahars could suddenly descend the
Toutle River if triggered by heavy rain or by interaction of hot rocks
with snow and ice. These lahars pose a negligible hazard below the
Sediment Retention Structure (SRS) but could pose a hazard along the
river channel upstream.
Potential ash hazards: Wind forecasts from the National Oceanic and
Atmospheric Administration (NOAA), coupled with eruption models, show
that any ash clouds rising above the crater rim today would drift
southeast.
Potential ash hazards to aviation: Under current eruptive conditions,
small, short-lived explosions may produce ash clouds that exceed 30,000
feet in altitude. Ash from such events can travel 100 miles or more
downwind.
Recent observations: Mount St. Helens is hidden by clouds this morning.
Weather forecasts for Columbus Day indicate sunny weather and excellent
opportunities to view the crater. Data from deformation-monitoring
instruments located on the 1980-86 and 2004-2006 lava domes indicate
that extrusion of the new lava dome continues, despite relatively low
seismicity levels. Mount Rainier's M 4.5 earthquake at about 7:50 PM
last night registered on the Mount St. Helens seismic network