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.
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![Geothermal ice cave at Mount Baker's summit formed by melting of a ...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1111.jpg?itok=0uz5q6mB)
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.
![Glacier Peak volcano, Washington reflected in pond below the Whitec...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1206.jpg?itok=DL13sIv9)
Glacier Peak volcano, Washington reflected in pond below the Whitechuck Glacier, view from the south in late summer.
Glacier Peak volcano, Washington reflected in pond below the Whitechuck Glacier, view from the south in late summer.
Guardian Geyser and Norris Geyser Basin, Yellowstone National Park.
Guardian Geyser and Norris Geyser Basin, Yellowstone National Park.
![Horizontal displacement vectors for GPS stations at Mount St. Helen...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1439.jpg?itok=C285Sqph)
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).
![Ice-chilled lava columns at the end of a Glacier Peak lava flow, Wa...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1205.jpg?itok=z41T_XKb)
Impressive columns like these form along the margins of ice-confined lava flows but usually are eroded off the sides due to continued glacial movement after an eruption ceases. Columns are better preserved at the ends of the flows (this photo) where they are protected somewhat from the ice.
Impressive columns like these form along the margins of ice-confined lava flows but usually are eroded off the sides due to continued glacial movement after an eruption ceases. Columns are better preserved at the ends of the flows (this photo) where they are protected somewhat from the ice.
![Lahar deposit cross section in the Trout Lake lowland, which origin...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1228.jpg?itok=za8_lDti)
Lahar deposit cross section in the Trout Lake lowland, which originated from Mount Adams. Thickness of deposit is about 2.5 m (8 ft).
Lahar deposit cross section in the Trout Lake lowland, which originated from Mount Adams. Thickness of deposit is about 2.5 m (8 ft).
![Leveling measurements of the slope of the Mount St. Helens' crater ...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img550.jpg?itok=okaDjlnY)
Tiltmeters allowed 24-hour monitoring as the information was telemetered back to CVO. Other instruments such as displacement meters for measuring cracks, seismometers for measuring earthquakes, gas sensors for measuring gas concentrations, and magnetometers for measuring the magnetic field, were also used for 24-hour monitoring.
Tiltmeters allowed 24-hour monitoring as the information was telemetered back to CVO. Other instruments such as displacement meters for measuring cracks, seismometers for measuring earthquakes, gas sensors for measuring gas concentrations, and magnetometers for measuring the magnetic field, were also used for 24-hour monitoring.
![Locations (Lat, Long, Depth) of January 17, 2010, earthquake swarm ...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img5463.jpg?itok=SsIfEipA)
Locations (Lat, Long, Depth) of January 17, 2010, earthquake swarm on Madison Plateau, Yellowstone National Park.
Locations (Lat, Long, Depth) of January 17, 2010, earthquake swarm on Madison Plateau, Yellowstone National Park.
Mammoth Hot Springs at Yellowstone National Park, Wyoming.
Mammoth Hot Springs at Yellowstone National Park, Wyoming.
![Mount Adams viewed from the southeast in Klickitat Valley, Washingt...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1155.jpg?itok=l24JuQjq)
Mount Adams viewed from the southeast in Klickitat Valley, Washington.
Mount Adams viewed from the southeast in Klickitat Valley, Washington.
![Mount Bachelor seen from South Sister across Sparks Lake. One of th...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1252.jpg?itok=ajLEQvnV)
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...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1253.jpg?itok=V6TSUvcB)
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.
![Mount Bachelor's east facing ski slopes at sunrise....](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1281.jpg?itok=gadAq5GO)
Mount Bachelor's east facing ski slopes at sunrise.
Mount Bachelor's east facing ski slopes at sunrise.
![Mount Baker's crater lake in 1976 formed due to glacial and snow me...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1110.jpg?itok=WP-ZLSEI)
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).
![Mount Hood dominates the skyline outside of Portland, Oregon on a c...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1115.jpg?itok=JdlHhBo1)
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, Ore...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1117.jpg?itok=aIVi_KxS)
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 Scott Lookout seismic and GPS volcano monitoring station, vie...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1266.jpg?itok=zbXYHNRd)
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.
![Mount St. Helens prior to the catastrophic eruption of May 18, 1980...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img992.jpg?itok=1wq7zUfn)
Mount St. Helens prior to the catastrophic eruption of May 18, 1980. Streams and lava flows also visible. View is looking southerly from oblique aerial view. Mount Hood in distance.
Mount St. Helens prior to the catastrophic eruption of May 18, 1980. Streams and lava flows also visible. View is looking southerly from oblique aerial view. Mount Hood in distance.
![Old Faithful geyser in eruption at Yellowstone National Park's Uppe...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img3306.jpg?itok=IismgaZw)
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.
Scientist collects a sample of gas in a vacuum sealed glass bottle near Nymph Lake, Yellowstone National Park.
Scientist collects a sample of gas in a vacuum sealed glass bottle near Nymph Lake, Yellowstone National Park.
![Shaded relief map of Kīlauea Volcano's summit with caldera bounding...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img4789.png?itok=oOe1XvHT)
Shaded relief map of Kīlauea Volcano's summit with caldera bounding faults delineated.
Shaded relief map of Kīlauea Volcano's summit with caldera bounding faults delineated.