• Interactive Imagemap [InlineGIF]: Cascade Range Volcanoes -- Graphic by: Lyn Topinka, 1996 ... [Map,150K,GIF]

• Map [20K,InlineGIF]: Major West Coast Volcanoes - Washington, Oregon, and California

• Map [27K,InlineGIF]: Potentially Active Volcanoes of the Western United States -- Modified from: Brantley, 1994, Volcanoes of the United States: USGS General Interest Publication

• Graphic [70K,InlineGIF]: Cascades Eruptions During the Past 4000 Years

• 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 [18K,InlineGIF]: Washington State and the Columbia River -- includes major volcanoes

• 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 [26K,InlineGIF]: Mount St. Helens Location -- Modified from: Costa, 1994, USGS OFR94-313

• Interactive Imagemap [Map,31K,InlineGIF]: Location of the Mount St. Helens National Volcanic Monument -- Lyn Topinka, 1997

• Interactive Imagemap [Map,47K,InlineGIF]: Mount St. Helens and Vicinity - Points of Interest -- Lyn Topinka, 1997

• Interactive Imagemap [Map,29K,InlineGIF]: Mount St. Helens National Volcanic Monument -- Lyn Topinka, 1997

• Map [33K,InlineGIF]: Index to 7.5-minute-USGS-Topographic Quadrangles surrounding Mount St. Helens National Volcanic Monument -- Modified from: USDA/USFS, 1990

• Map [20K,InlineGIF]: Major Hydrologic Features in the Mount St. Helens Region -- Basemap from: Crandell and Mullineaux, 1978, USGS Bulletin 1383-C

• Schematic,13K,InlineGIF: Windy Ridge Viewpoint - Looking West -- Modified from: Doukas, 1990, USGS Bulletin 1859

• Annotated NASA Image [106K,InlineJPG]: Looking South at Mount Adams, Mount St. Helens, and the Columbia River, Washington, August 1989 -- NASA Photo, courtesy NASA Earth From Space; Modified with text by USGS/CVO.

• Annotated NASA Image [86K,InlineJPG]: Mount St. Helens and Vicinity, Washington, September 1992 -- NASA Photo, courtesy NASA Earth From Space; Modified with text by USGS/CVO.

• Annotated NASA Image [99K,InlineJPG]: Mount St. Helens, Washington, September 1994 -- NASA Photo, courtesy NASA Earth From Space; Modified with text by USGS/CVO

• Annotated NASA Image [168K,InlineJPG]: Columbia River and Mount St. Helens, Washington, October 1994 -- NASA Photo, courtesy NASA Earth From Space; Modified with text by USGS/CVO

• Graphic [20K,InlineGIF]: Generalized North-South Geologic Cross Sections Through Mount St. Helens -- Modified from: Doukas, 1990, USGS Bulletin 1859

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

• Map [21K,InlineGIF]: Mount St. Helens area showing May 18, 1980 devastation -- Modified from: Tilling, Topinka, and Swanson, 1990

• Map [14K,InlineGIF]: Distribution within the United States of May 18, 1980 ash fallout from Mount St. Helens -- Modified from: Tilling, Topinka, and Swanson, 1990

• Map [22K,InlineGIF]: May 18, 1980 Ash Plume Path -- Modified from: Sarna-Wojcicki, et.al., 1981, IN: USGS Professional Paper 1250

• Map [32K,InlineGIF]: Lakes North of Mount St. Helens Affected by the May 18, 1980 Eruption -- Modified from: Dion and Embrey, 1981, USGS Circular 850-C, and Embrey and Dion, 1988, WRI-87-4263

• Graphic [18K,GIF]: Surface-water temperatures of Spirit Lake before (1974) and after (1980) the May 18, 1980 eruption of Mount St. Helens -- Modified from: Dion and Embrey, 1981, USGS Circular 850-G

• Graphic [18K,InlineGIF]: Plot of thickness vs. distance from vent for several tephras from Cascade Range volcanoes. -- Modified from: Hoblitt, et.al., 1987, USGS Open-File Report 87-297

• Schematic [13K,GIF]: stratigraphic section in Harry Gardner Park. -- L, lithic-rich layer; P, pumice-rich layer. -- Modified from: Doukas, 1990, USGS Bulletin 1859

• Schematic [22K,GIF]: Dome Growth 1980-83 - Ground Profile -- Taken from tracings of photographs from fixed photo station on crater floor, approximately 1 kilometer north of center of dome. Products of each extrusive episode include talus that accumulated during that episode. Scale varies owing to perspective view; true east-west basal diameter of dome in December 1983 was about 830 meters. -- Modified from: Swanson, et.al., 1987, IN: GSA Special Paper 212

• Schematic [10K,GIF]: Dome Growth 1980-86 - Yearly Ground Profile -- Taken from tracings of photographs from fixed photo station on crater floor, approximately 1 kilometer north of center of dome. Includes accumulated talus. Scale varies owing to perspective view. Approximate 1986 east-west basal diameter of dome was about 860 meters. -- Modified from: Topinka, 1992, IN: USGS Bulletin 1966

• Schematic [14K,GIF]: Lobe Development - Aerial View - Schematic drawings of lobe development in the growth of a lava dome, as traced off aerial photographs of Mount St. Helens Lava Dome, 1980-1981. -- Modified from: Swanson, et.al., 1987, IN: GSA Special Paper 212

• Schematic [12K,GIF]: Emerging New Lobe, August 1982 -- Taken from tracings of photographs from photo station on crater floor, showing 1-day and 2-week intervals. -- Modified from: Topinka, 1992, IN: USGS Bulletin 1966

• Hazards Report and Map Menu: Volcanic-Hazard Zonation for Mount St. Helens, Washington, 1995 -- [Map,2.14M,PDF] -- Wolfe and Pierson, 1995, USGS Open-File Report 95-497

• Map [18K,GIF]: Map showing 1982 Mount St. Helens Monitoring Sites -- Modified from: E. Iwatsubo, 1996, and Brantley and Topinka, 1984

• Map [20K,GIF]: Map showing 1995 Mount St. Helens Dome Deformation EDM Lines -- Modified from: E. Iwatsubo, 1996

• Map [30K,GIF]: Map showing Mount St. Helens "OuterNet" Flank Deformation Trilateration Lines -- Modified from: E. Iwatsubo, 1996

• 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 [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 [16K,InlineGIF]: University of Washington's Pacific Northwest Seismograph Network - Mount St. Helens Vicinity -- 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 [20K,InlineGIF]: Mount St. Helens Seismicity, 2006 -- 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 [26K,InlineGIF]: Mount St. Helens Energy Release, 2006 -- 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 [20K,InlineGIF]: Mount St. Helens Seismicity, 2005 -- 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 [28K,InlineGIF]: Mount St. Helens Energy Release, 2005 -- 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 [22K,InlineGIF]: Mount St. Helens Seismicity, 2004 -- 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, 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 [20K,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 [20K,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 [22K,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

• Graphic [25K,InlineGIF]: Mount St. Helens Seismicity, 1980-1996 -- 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 [651K,InlineJPG], Mount St. Helens Seismogram, May 18, 1980 -- from Station CPW, 70 miles to the northwest.

• [Map,InlinedGIF]: Location Map, Major Hydrologic Data Collection Sites Surrounding Mount St. Helens -- Current and Historical

• Map [16K,GIF]: Location Map, Castle Lake Piezometers -- Modified from: Roeloffs, 1994, USGS WRI-94-4075

• Table [14K,GIF]: Summary of drainage basin and channel characteristics, Lewis River system -- From: Martinson, et.al., 1985, USGS Open-File Report 85-631

• Table [15K,GIF]: Summary of eruptive effects, Lewis River system -- From: Martinson, et.al., 1985, USGS Open-File Report 95-631

• Table [14K,GIF]: Drainage basin characteristics and volcanic impacts, Toutle River system -- From: Meyer and Dodge, 1987, USGS Open-File Report 87-549

• Graphic [12K,GIF]: Erosion of North Fork Toutle River at Loowit Confluence, 1982 vs. 1990 -- Graphic by: Lyn Topinka, 1996

• Graphic [11K,GIF]: Flood of February 1996 - Cowlitz River at Castle Rock -- stage adjusted to feet above sea level (NAVD88)

• Graphic [12K,GIF]: Flood of February 1996 - Toutle River at Tower Road -- stage in feet above gage (1929NGVD)

• Graphic [70K,InlineGIF]: Cascades Eruptions During the Past 4000 Years

• Graphic [14K,GIF]: Post-A.D. 1400 segment of eruptive history of Mount St. Helens -- From: Tilling et.al., 1990

• Table [27K,GIF]: Simplified Eruptive History of Mount St. Helens -- Modified from: Swanson, et.al., 1989, AGU Field Trip Guidebook T106, Original Simplified from: Crandell, 1987

• Schematic [25K,GIF]: West-East Geologic Section of gully bank near NE base of Mount St. Helens, south of Windy Ridge. -- Modified from: Doukas, 1990, USGS Bulletin 1859

• Schematic [25K,GIF]: Generalized stratigraphic section of outcrop at Muddy River-Pine Creek Fan (near Lahar Viewpoint). -- Modified from: Doukas, 1990, USGS Bulletin 1859

• Graphic [18K,InlineGIF]: Plot of thickness vs. distance from vent for several tephras from Cascade Range volcanoes. -- Modified from: Hoblitt, et.al., 1987, USGS Open-File Report 87-297

• MORE Cascade Range Maps and Graphics
• MORE Washington State Maps and Graphics
• MORE Annotated NASA Images

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