Remnant of Villard Glacier is in cirque below. Thick summit lava flow makes up "Glisan Pinnacle," which overlies hundreds of thin rubbly lava flows that are intercalated with red-oxidized agglutinate and scoria falls exposed on 800-m- (2600-ft-) high face below. Flows that form ridge at upper right are thicker than those on most of edifice.
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North Sister's steep NE face, thick summit lava flow makes up "Glis...
Remnant of Villard Glacier is in cirque below. Thick summit lava flow makes up "Glisan Pinnacle," which overlies hundreds of thin rubbly lava flows that are intercalated with red-oxidized agglutinate and scoria falls exposed on 800-m- (2600-ft-) high face below. Flows that form ridge at upper right are thicker than those on most of edifice.
Mount Bachelor seen from South Sister across Sparks Lake. One of th...
Mount Bachelor seen from South Sister across Sparks Lake. One of the "Devils Chain" domes visible in lower image foreground. Oregon
Mount Bachelor seen from South Sister across Sparks Lake. One of the "Devils Chain" domes visible in lower image foreground. Oregon
Mount Bachelor viewed from the south. Sparks Lake and South Sister...
Mount Bachelor viewed from the south. Sparks Lake and South Sister visible in the background. Oregon.
Mount Bachelor viewed from the south. Sparks Lake and South Sister visible in the background. Oregon.
Three Sisters viewed from south to North from Broken Top, OR.
Three Sisters annotated photograph viewed from south to North from Broken Top, Oregon.
Three Sisters annotated photograph viewed from south to North from Broken Top, Oregon.
Mount Scott Lookout seismic and GPS volcano monitoring station, vie...
Mount Scott Lookout seismic and GPS volcano monitoring station, view from the southwest. Near Crater Lake, Oregon.
Mount Scott Lookout seismic and GPS volcano monitoring station, view from the southwest. Near Crater Lake, Oregon.
Deformation monitoring equipment—GPS antenna maintenance on south s...
Deformation monitoring equipment—GPS antenna maintenance on south side of Crater Lake National Park Boathouse on Wizard Island. Oregon
Deformation monitoring equipment—GPS antenna maintenance on south side of Crater Lake National Park Boathouse on Wizard Island. Oregon
Mount Bachelor's east facing ski slopes at sunrise.
Mount Bachelor's east facing ski slopes at sunrise.
Mount Bachelor's east facing ski slopes at sunrise.
Old Faithful geyser in eruption at YNP's Upper Geyser Basin.
Old Faithful geyser in eruption at Yellowstone National Park's Upper Geyser Basin.
Old Faithful geyser in eruption at Yellowstone National Park's Upper Geyser Basin.
Mount St. Helens
Mount St. Helens
Mount St. Helens
Silica sinter (an amorphous form of silicon dioxide) forms from the...
Silica sinter (an amorphous form of silicon dioxide) forms from the waters that flow from hot springs near Shoshone Lake, Yellowstone National Park. USGS photograph by Jake Lowenstern.
Silica sinter (an amorphous form of silicon dioxide) forms from the waters that flow from hot springs near Shoshone Lake, Yellowstone National Park. USGS photograph by Jake Lowenstern.
Dome building episode from 2004-2008 at Mount St. Helens can be obs...
Dome building episode from 2004-2008 at Mount St. Helens can be observed and measured with these two digital elevation models (DEMs) developed before and after the eruptive episode.
Dome building episode from 2004-2008 at Mount St. Helens can be observed and measured with these two digital elevation models (DEMs) developed before and after the eruptive episode.
Children pose with 8 ton ballistic block at Kīlauea, Hawai‘i.
Some of the large ballistic blocks from the Kīlauea eruption of 1924 later became visitor attractions. Many of these blocks remain in place today as evidence of the forces unleashed at Kīlauea during the eruption of 1924.
Some of the large ballistic blocks from the Kīlauea eruption of 1924 later became visitor attractions. Many of these blocks remain in place today as evidence of the forces unleashed at Kīlauea during the eruption of 1924.
Topographic map, Mount St. Helens, C.E. 1919 annotated with locatio...
Due to the cataclysmic eruption of May 18, 1980, many of the locations annotated on this map are now either covered or no longer visible.
Due to the cataclysmic eruption of May 18, 1980, many of the locations annotated on this map are now either covered or no longer visible.
Sherman Crater, Mount Baker, WA. Postcard photograph taken from sou...
No date exists for this photograph, but the image is likely circa 1900. Note the postcard copyright date of 1903.
No date exists for this photograph, but the image is likely circa 1900. Note the postcard copyright date of 1903.
Mount Baker's crater lake in 1976 formed due to glacial and snow me...
Mount Baker's crater lake in 1976 formed due to glacial and snow melt as a result of increased heat from magma beneath the surface. Fumarole on left ejecting gas at a velocity of 268 kph (167 mph).
Mount Baker's crater lake in 1976 formed due to glacial and snow melt as a result of increased heat from magma beneath the surface. Fumarole on left ejecting gas at a velocity of 268 kph (167 mph).
Geothermal ice cave at Mount Baker's summit formed by melting of a ...
Geothermal ice cave at Mount Baker's summit formed by melting of a glacier due to increased heat from subsurface magma and fumarole on the surface expelling hot gasses.
Geothermal ice cave at Mount Baker's summit formed by melting of a glacier due to increased heat from subsurface magma and fumarole on the surface expelling hot gasses.
Mount Hood dominates the skyline outside of Portland, OR on a clear...
Mount Hood dominates the skyline outside of Portland, Oregon on a clear day. An major eruption of Mount Hood would pose a great hazard to the regional economy.
Mount Hood dominates the skyline outside of Portland, Oregon on a clear day. An major eruption of Mount Hood would pose a great hazard to the regional economy.
Mount Hood in the not-so-far distance beyond Downtown Portland, OR....
Mount Hood in the not-so-far distance beyond Downtown Portland, Oregon. Photograph taken at the top of the Portland Aerial Tram line on Marquam Hill.
Mount Hood in the not-so-far distance beyond Downtown Portland, Oregon. Photograph taken at the top of the Portland Aerial Tram line on Marquam Hill.
Mount Adams viewed from SE in Klickitat Valley, WA.
Mount Adams viewed from the southeast in Klickitat Valley, Washington.
Mount Adams viewed from the southeast in Klickitat Valley, Washington.
Testing bathymetric equipment at Coldwater Lake, Mount St. Helens
Adam Mosbrucker tests equipment (Acoustic Doppler Current Profiler, survey-grade RTK-GPS and a map-grade GPS) in preparation for a lake bottom survey.
Adam Mosbrucker tests equipment (Acoustic Doppler Current Profiler, survey-grade RTK-GPS and a map-grade GPS) in preparation for a lake bottom survey.
Horizontal displacement vectors at Mount St. Helens (2008-2014)
Map of horizontal displacement vectors for Global Positioning System (GPS) stations in and around Mount St. Helens. Blue arrows show the direction and magnitude of horizontal movement, as measured at the GPS station from 2008-2014. The total horizontal displacement is indicated in millimeters (mm) and inches (in).
Map of horizontal displacement vectors for Global Positioning System (GPS) stations in and around Mount St. Helens. Blue arrows show the direction and magnitude of horizontal movement, as measured at the GPS station from 2008-2014. The total horizontal displacement is indicated in millimeters (mm) and inches (in).