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.
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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
Thema: Mount St. Helens rumort (Gelesen 3922 mal)