[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

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

[Graphic,22K,InlineGIF]
Mount St. Helens Seismicity, 2003, -- 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,22K,InlineGIF]
Mount St. Helens Seismicity, 2002, -- 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,22K,InlineGIF]
Mount St. Helens Seismicity, 2001, -- 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,22K,InlineGIF]
Mount St. Helens Seismicity, 2000, -- 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,22K,InlineGIF]
Mount St. Helens Seismicity, 1999, -- 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,30K,InlineGIF]
Mount St. Helens Seismicity, 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,23K,InlineGIF]
Mount St. Helens Seismicity, 1997, -- 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,25K,InlineGIF]
Mount St. Helens Seismicity, 1996, -- 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,25K,InlineGIF]
Mount St. Helens Seismicity, 1995, -- 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,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

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

[Graphic,20K,InlineGIF]
Mount Rainier Seismicity, 2003, Time vs. Depth
-- Modified from: University of Washington Geophysics Program

[Graphic,20K,InlineGIF]
Mount Rainier Seismicity, 2002, Time vs. Depth
-- Modified from: University of Washington Geophysics Program

[Graphic,20K,InlineGIF]
Mount Rainier Seismicity, 2001, Time vs. Depth
-- Modified from: University of Washington Geophysics Program

[Graphic,15K,InlineGIF]
Mount Rainier Seismicity, 2000, Time vs. Depth
-- Modified from: University of Washington Geophysics Program

[Graphic,15K,InlineGIF]
Mount Rainier Seismicity, 1999, Time vs. Depth
-- Modified from: University of Washington Geophysics Program

[Graphic,15K,InlineGIF]
Mount Rainier Seismicity, 1998, Time vs. Depth
-- Modified from: University of Washington Geophysics Program

[Graphic,20K,InlineGIF]
Mount Hood Seismicity, 2003, Time vs. Depth
-- Modified from: University of Washington Geophysics Program

[Graphic,20K,InlineGIF]
Mount Hood Seismicity, 2002, Time vs. Depth
-- Modified from: University of Washington Geophysics Program

[Graphic,20K,InlineGIF]
Mount Hood Seismicity, 2001, Time vs. Depth
-- Modified from: University of Washington Geophysics Program

[Graphic,20K,InlineGIF]
Mount Hood Seismicity, 2000, Time vs. Depth
-- Modified from: University of Washington Geophysics Program

[Graphic,20K,InlineGIF]
Mount Hood Seismicity, 1999, Time vs. Depth
-- Modified from: University of Washington Geophysics Program

[Graphic,15K,InlineGIF]
Mount Hood Seismicity, 1998, Time vs. Depth
-- Modified from: University of Washington Geophysics Program

[Graphic,25K,InlineGIF]
Mount Hood Seismicity, 1990-1999, Time vs. Depth

[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

[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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