USGS/Cascades Volcano Observatory, Vancouver, Washington
Mount St. Helens, Washington -
Summary of Mount St. Helens Volcanic Activity, March 1998
The following information is provided by the U.S. Geological
Survey's Cascades Volcano Observatory and by the
University of Washington's Geophysics Program.
The U.S. Geological Survey and University of Washington monitor
earthquakes and other activity at Mount St. Helens as part of the
USGS Volcano Hazards Program.
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Mount St. Helens Seismicity - Map and Cross-Section
Cross-sectional view showing the locations of earthquakes beneath Mount St.
Helens during March 1998. The cross-section represents a vertical slice
of the crust downward from line A-A' in the map view. The earthquakes
occurred in and around the magma conduit system that leads from the magma
reservoir to the dome. In this graph, 0 depth is referenced to 1.5 km
(about 1 mile) below the current summit of Mount St. Helens (8,363 feet
above sea level).
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Mount St. Helens Seismicity - Time vs. Depth
Graph showing relationship between time and depth of earthquakes beneath
Mount St. Helens from
April 1997 to March 1998.
In this graph, 0 depth is referenced to 1.5 km (about 1
mile) below the current summit of Mount St. Helens (8,363 feet above sea
level).
For More Information:
Link to:
Mount St. Helens Seismicity Information
-- Link courtesy
University of Washington Geophysics Program
Return to:
[Mount St. Helens Menu] ...
[Mount St. Helens Current Activity Menu]
[Mount St. Helens Monitoring Menu]
URL for CVO HomePage is:
<http://vulcan.wr.usgs.gov/home.html>
URL for this page is:
<http://vulcan.wr.usgs.gov/Volcanoes/MSH/CurrentActivity/1998/summary_mar98.html>
If you have questions or comments please contact:
<GS-CVO-WEB@usgs.gov>
04/10/98, Lyn Topinka
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