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USGS/Cascades Volcano Observatory, Vancouver, Washington

Mount St. Helens, Washington -
Summary of Mount St. Helens Volcanic Activity, June 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.


In the month of June, 318 well-located (quality BB or better), high-frequency earthquakes occurred beneath Mount St. Helens, with the largest earthquake having a magnitude of 1.8.

[Map,11K,GIF]
Mount St. Helens Seismicity - Time vs. Depth
Graph showing relationship between time and depth of earthquakes beneath Mount St. Helens from July 1997 to June 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:

Mount St. Helens Volcanic Activity Information Statement, July 1, 1998

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]



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07/08/98, Lyn Topinka