USGS/Cascades Volcano Observatory, Vancouver, Washington
Mount St. Helens, Washington
Earthquakes and Seismicity
- Current Activity
- Pacific Northwest Seismic Network (PNSN)
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Pacific Northwest Seismic Network (PNSN)
-- Information, Maps, includes link to the University of Washington PNSN Website
Earthquakes commonly provide the earliest warning of volcanic unrest, and earthquake swarms immediately precede most volcanic eruptions. Information on Pacific Northwest earthquake activity and hazards is provided by the Pacific Northwest Seismic Network (PNSN) which operates seismograph stations and locates earthquakes in Washington and Oregon. The PNSN is operated jointly by the University of Washington, the University of Oregon, and Oregon State University, and is funded by the U.S. Geological Survey, the Department of Energy, and the State of Washington. The PNSN is based at the Geophysics Program of the University of Washington in Seattle, and is a member of the Council of the National Seismic Systems (CNSS), a group of regional network operators who cooperate to locate and catalog earthquakes throughout the United States. -- Wright and Pierson, 1992; and the University of Washington's Geophysics Program
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2003, Seismic Monitoring at Cascade Volcanic Centers - The Big Picture
Informational text and shaded relief map
showing locations of all PNSN/NCSN seismic stations operating in the Pacific Northwest as of November, 2003. Map includes the 13 major Cascade volcanic centers.
-- Excerpt from: Moran, 2005, USGS Scientific Investigations Report 2004-5211
- Graphics
- -- Time/Depth, showing relationship between time and depth of earthquakes beneath Mount St. Helens. "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).
-- Graphics modified from: University of Washington's Geophysics Program
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2008, Time/Depth
-- [Graphic,20K,InlineGIF]
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2008, Energy Release, October 2007 through October 2008
-- [Graphic,29K,InlineGIF]
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2007, Time/Depth
-- [Graphic,20K,InlineGIF]
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2007, Energy Release
-- [Graphic,29K,InlineGIF]
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2006, Time/Depth
-- [Graphic,20K,InlineGIF]
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2006, Energy Release
-- [Graphic,26K,InlineGIF]
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2005, Time/Depth
-- [Graphic,20K,InlineGIF]
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2005, Energy Release
-- [Graphic,28K,InlineGIF]
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2004
-- [Graphic,22K,InlineGIF]
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2003
-- [Graphic,22K,InlineGIF]
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2002
-- [Graphic,22K,InlineGIF]
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2001
-- [Graphic,20K,InlineGIF]
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2000
-- [Graphic,20K,InlineGIF]
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1999
-- [Graphic,22K,InlineGIF]
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1998
-- [Graphic,30K,InlineGIF]
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1997
-- [Graphic,23K,InlineGIF]
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1996
-- [Graphic,23K,InlineGIF]
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1995
-- [Graphic,25K,InlineGIF]
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1980-1998
-- [Graphic,32K,InlineGIF]
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1980-1996
-- [Graphic,32K,InlineGIF]
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Monthly Graphics - 1996 to Current
-- Time/Depth, Energy Release, [InlineGIFs]
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May 18, 1980 Seismogram
-- [Graphic,561K,InlineJPG]
- Maps, Graphics, and Images
- Items of Interest
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Approximate event counts, by event type at five Cascade volcanoes, 1989-90
-- includes Mount St. Helens
-- Jonientz-Trisler, Myers, and Power, 1994, IN: USGS Bulletin 2047
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Archives
-- Monthly Seismicity Summaries for Mount St. Helens - Graphics
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Earthquakes and Seismicity, Signals and Tremor, Magnitude and Intensity - General Descriptions
-- General information about earthquakes and seismicity
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Graphics, Yearly Seismicity
-- includes Mount St. Helens, Mount Rainier, and Mount Hood
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Historical Seismic Work at Mount St. Helens
-- Excerpt from: Endo, et.al., 1981, IN: USGS Professional Paper 1250
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Locations, Magnitudes, and Statistics of the March 20 - May 18 Earthquake Sequence
-- Endo, et.al., 1981, IN: USGS Professional Paper 1250
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May 18, 1980 Seismogram
-- [Graphic,561K,InlineJpg]
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Monthly Updates
-- includes seismicity
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Pacific Northwest Seismic Network (PNSN)
-- Information and links
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Pacific Northwest Seismic Network - Oregon and Southern Washington - 1998 Map
-- [Map,30K,InlineGIF]
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Pacific Northwest Seismic Network - Washington and Oregon - 1998 Map
-- [Map,40K,InlineGIF]
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Pacific Northwest Seismic Network - Washington and Oregon - 2003 Information and Map
-- Moran, 2005, USGS Scientific Investigations Report 2004-5211
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Post-May 18 Seismicity; Volcanic and Tectonic Implications
-- Weaver, et.al., 1981, IN: USGS Professional Paper 1250
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CVO Photo Archives - Monitoring Images, 1980-2004
-- including AFMs
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CVO Photo Archives - Monitoring Images, 2004 to Current
-- including AFMs
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RSAM (Real-Time Seismic-Amplitude Measurement) and SSAM (Seismic Spectral-Amplitude Measurement) Systems
-- Description
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Seismic Event - Information Statement, November 3, 2001
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Seismic Event - Information Statement, August 14, 1998
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Seismic Event - Information Statement, July 1, 1998
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Seismic Event - Information Statement, June 2, 1998
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Seismic Event - Update: February 22, 1996
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Seismic Identification of Gas-and-Ash Explosions at Mount St. Helens -- Capabilities, Limitations, and Regional Application
-- Jonientz-Trisler, Myers, and Power, 1994, IN: USGS Bulletin 2047
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Seismic Monitoring at Cascade Volcanic Centers, 2004 -- Status and Recommendations
-- Moran, 2005, USGS Scientific Investigations Report 2004-5211
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Seismic Studies 1980 - 1983
-- Excerpt from: Brantley and Topinka, 1984, Earthquake Information Bulletin, v.16, n.2
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Seismogram, May 18, 1980
-- [Graphic,561K,InlineJpg]
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Summary of Important Seismic Events, March 20 - May 18, 1980
-- Excerpt from: Endo, et.al., 1981, IN: USGS Professional Paper 1250
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Summary of Mount St. Helens Seismic Activity, January through September 1995
-- [PDF Format, 1M]
-- IN: Washington Geology, December 1995, Vol.23, No.4, p.13-14.
- General Earthquake and Seismic Information
- Useful Links
Return to:
[Mount St. Helens Volcano Menu]
[Mount St. Helens Hazards Menu]
[Mount St. Helens Monitoring Menu]
[Cascade Range Earthquakes and Seismicity]
[Earthquakes and Seismicity 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/Seismicity/framework.html>
If you have questions or comments please contact:
<GS-CVO-WEB@usgs.gov>
04/01/09, Lyn Topinka