[Graphic,20K,GIF]
Four major types of seismograms - Tectonic, Volcanic, Surface, and Tremor
-- From: Brantley and Topinka, 1984, Earthquake Information Bulletin

[Graphic,28K,GIF]
Seismograms of Volcanic Earthquakes vs. Tectonic Earthquakes, P, S, and Surface Waves
-- Courtesy of: Noson, et.al., 1988, Washington State Earthquake Hazards: Washington State Department of Natural Resources, Washington Division of Geology and Earth Resources Information Circular 85, p.9., Modified by: Topinka, USGS/CVO, 1997

[Map,30K,InlineGIF]
Earthquakes and Plate Tectonics -- Earthquakes around the world for the past 5 years as of July 7, 1999. The distribution of seismicity over the past 5 years defines boundaries of tectonic plates.
-- "Flat" color version

[Map,115K,InlineGIF]
Earthquakes and Plate Tectonics -- Earthquakes around the world for the past 5 years as of July 7, 1999. The distribution of seismicity over the past 5 years defines boundaries of tectonic plates.
-- "Topographic" version

[Map,35K,InlineGIF]
Earthquakes, Active Volcanoes, and Plate Tectonics

[Map,40K,InlineGIF]
University of Washington's Pacific Northwest Seismic Network
-- Modified from: University of Washington Geophysics Program, 1998, includes seismic station location map and link to PNSN

[Map,30K,InlineGIF]
Oregon and Southern Washington - University of Washington's Pacific Northwest Seismograph Network
-- Modified from: University of Washington Geophysics Program, 1999, includes seismic station location map and link to PNSN

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

[Map,16K,InlineGIF]
Mount St. Helens - University of Washington's Pacific Northwest Seismograph Network
-- Modified from: University of Washington Geophysics Program, 1997

[Graphic,20K,InlineGIF]
Mount St. Helens Seismicity, 2007, -- 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).
-- Modified from: University of Washington's Geophysics Program

[Graphic,29K,InlineGIF]
Mount St. Helens Energy Release, 2007, -- Each point represents the sum of energy released by all earthquakes in a 14 day period, Energy is computed in 14 day time windows, every 7 days, Strain energy is plotted in ergs1/2, Green triangles, if shown, represent phreatic explosions, Cyan triangles, if shown, represent dome-building eruptions, and Red triangles, if shown, represent explosive magmatic eruptions.
-- Modified from: University of Washington's Geophysics Program

[Graphic,25K,InlineGIF]
Mount St. Helens Seismicity, 1980-1998, -- 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).
-- Modified from: University of Washington's Geophysics Program

[Graphic,651K,InlineJPG]
Mount St. Helens Seismogram, May 18, 1980, -- from Station CPW, 70 miles to the northwest.

MORE Mount St. Helens -- includes yearly seismic plots since 1995, and energy release plots since 2005, scroll down to "Seismicity"

[Map,13K,InlineGIF]
Mount Rainier - University of Washington's Pacific Northwest Seismograph Network
-- Modified from: University of Washington Geophysics Program, 1997

[Graphic,19K,InlineGIF]
Mount Rainier Seismicity, 2007, Time vs. Depth
-- Modified from: University of Washington Geophysics Program

[Graphic,25K,InlineGIF]
Mount Rainier Seismicity, 1998-2007
-- Modified from: University of Washington Geophysics Program

MORE Mount Rainier -- includes yearly seismic plots since 1998, scroll down to "Seismicity"

[Graphic,19K,InlineGIF]
Mount Hood Seismicity, 2007, Time vs. Depth
-- Modified from: University of Washington Geophysics Program

[Graphic,25K,InlineGIF]
Mount Hood Seismicity, 1998-2007
-- Modified from: University of Washington Geophysics Program

[Graphic,25K,InlineGIF]
Mount Hood Seismicity, 1990-1999, Time vs. Depth
-- Modified from: University of Washington Geophysics Program

MORE Mount Hood -- includes yearly seismic plots since 1998, scroll down to "Seismicity"

[Map,29K,InlineGIF]
Earthquake Epicenters and Magnitudes in the Crater Lake Region, 1920-1995
-- Modified from: Bacon, et.al., 1997, USGS Open-File Report 97-487

[Graphic,25K,InlineGIF]
Crater Lake Seismicity, 1997-2007
-- Modified from: University of Washington Geophysics Program

[Map,18K,InlineGIF]
Yellowstone National Park -- showing caldera rim and location of 1959 and 1975 quakes
-- Modified from: Dzurisin, et.al., 1995, USGS Open-File Report 95-59

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