CVO Website - Mount St. Helens Current Activity

USGS/Cascades Volcano Observatory, Vancouver, Washington

Mount St. Helens, Washington
Summary of Mount St. Helens Seismic Activity,
August 2006

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.

Mount St. Helens Seismicity - Time vs. Depth

Graph showing relationship between time and depth of earthquakes beneath Mount St. Helens from August 2005 through August 2006. In this graph, 0 depth is referenced to 1.5 kilometers (about 1 mile) below the current summit of Mount St. Helens (8,363 feet above sea level).

Energy of Mount St. Helens' Earthquakes

Plot, Mount St. Helens Seismicity, Energy Release

Mount St. Helens Seismicity - Energy Release

Graph showing energy release for Mount St. Helens from September 2005 through August 2006. Each point represents the sum of energy released by all earthquakes in a 24 hour period -- Energy is computed in 24 hour time windows, every 12 hours -- Strain energy is plotted in ergs1/2 -- Green triangles, if shown, represent phreatic explosions -- Cyan triangles, if shown, represent dome-building eruptions -- Red triangles, if shown, represent explosive magmatic eruptions.

For More Information:
Link to: Mount St. Helens Seismicity Information -- Link courtesy University of Washington Geophysics Program

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10/06/06, Lyn Topinka