• 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 Lyn Topinka, USGS/CVO

• World 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

• World 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

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

• Map [40K,InlineGIF]: University of Washington's Pacific Northwest Seismic Network -- Washington and Oregon -- Modified from: University of Washington Geophysics Program, September 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, 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 [32K,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 Geophysics Program

• Graphic [561K,InlineJPG]: Mount St. Helens May 18, 1980 Seismogram -- 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, Time vs. Depth -- 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, Time vs. Depth -- 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, Time vs. Depth -- 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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