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Volcano Hazard Program images.

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Crater Lake bathymetric map showing the geology of the caldera floo...
Crater Lake bathymetric map showing the geology of the caldera floo...
Crater Lake bathymetric map showing the geology of the caldera floo...
Mount Baker summit, Washington. Coleman Glacier to the left and Eas...
Mount Baker summit, WA. Coleman Glacier to left and Easton Glacier ...
Mount Baker summit, WA. Coleman Glacier to left and Easton Glacier ...
Mount Baker summit, WA. Coleman Glacier to left and Easton Glacier ...

Mount Baker summit, Washington. Coleman Glacier to the left and Easton Glacier to the right. Lower peak on the right is the edge of Sherman Crater. View to east.

Norris-2003. Panoramic photo of the area impacted during the explos...
Panoramic photo of area impacted during explosions at Norris in 2004
Panoramic photo of area impacted during explosions at Norris in 2004
Panoramic photo of area impacted during explosions at Norris in 2004

View to the southeast through the area affected by the increased thermal output at Norris' Back Basin in the summer of 2003. The foreground shows steaming areas where boiling water and steam have approached the surface, resulting in increased ground temperatures.

View to the southeast through the area affected by the increased thermal output at Norris' Back Basin in the summer of 2003. The foreground shows steaming areas where boiling water and steam have approached the surface, resulting in increased ground temperatures.

Black Buttes (jagged and pointed peaks to the left) and Mount Baker...
Black Buttes and Mount Baker in WA.
Black Buttes and Mount Baker in WA.
Black Buttes and Mount Baker in WA.

Black Buttes stratovolcano and south side of ice-mantled Mount Baker. Aerial view northeastward. For Black Buttes, strata of the two highest crags (Lincoln Peak, left, and Colfax Peak) display opposing 308 dips that frame the gutted edifice.

Black Buttes stratovolcano and south side of ice-mantled Mount Baker. Aerial view northeastward. For Black Buttes, strata of the two highest crags (Lincoln Peak, left, and Colfax Peak) display opposing 308 dips that frame the gutted edifice.

Eruption cloud, from the east crater of Anatahan Volcano
Eruption cloud Anatahan Volcano
Eruption cloud Anatahan Volcano
Eruption cloud Anatahan Volcano

Eruption cloud, from the east crater of Anatahan Volcano, rising to a height of about 15,000 feet, on May 10, 2003. View from the NE side of the island, looking in a southwesterly direction.

Eruption cloud, from the east crater of Anatahan Volcano, rising to a height of about 15,000 feet, on May 10, 2003. View from the NE side of the island, looking in a southwesterly direction.

Bathymetric map of Yellowstone Lake
Bathymetric map of Yellowstone Lake
Bathymetric map of Yellowstone Lake
Bathymetric map of Yellowstone Lake

Bathymetric map of Yellowstone Lake showing hydrothermal features in the north part of the lake, including Elliott's Crater, Mary Bay, and Deep Hole.  Colors correspond to lake depth, with cooler colors indicating greater depths.

Plantation forestry on the slopes of Mt Etna during the 2002 erupti...
Plantation forestry on the slopes of Mt Etna during the 2002 erupti...
Plantation forestry on the slopes of Mt Etna during the 2002 erupti...
Plantation forestry on the slopes of Mt Etna during the 2002 erupti...

Plantation forestry on the slopes of Mt Etna during the 2002 eruption, unaffected by several millimetres of fallen ash.

Example output from VolatileCalc for rhyolite.
Example output from VolatileCalc
Example output from VolatileCalc
Example output from VolatileCalc

Isobars (gray) represent locus of values for dissolved H2O andCO2 in rhyolitic melt in equilibrium with H2O–CO2 vapor at 800°C and selected pressures. Isopleths represent locus of rhyolitic melt compositions in equilibrium with the given vapor compositions (20, 50 and80 mol% H2

Isobars (gray) represent locus of values for dissolved H2O andCO2 in rhyolitic melt in equilibrium with H2O–CO2 vapor at 800°C and selected pressures. Isopleths represent locus of rhyolitic melt compositions in equilibrium with the given vapor compositions (20, 50 and80 mol% H2

Aerial View of the Quito International Airport During an Eruption o...
Quito Intl. Airport During an Eruption of Reventador
Quito Intl. Airport During an Eruption of Reventador
Quito Intl. Airport During an Eruption of Reventador

Quito's international airport was covered with 3-5 mm of ash from the 3 November 2002 eruption of Reventador Volcano, located ~60 miles to the east of the Ecuadorean capital. The airport was closed for 8 days while clean up took place.

Quito's international airport was covered with 3-5 mm of ash from the 3 November 2002 eruption of Reventador Volcano, located ~60 miles to the east of the Ecuadorean capital. The airport was closed for 8 days while clean up took place.

MODIS satellite image of New Zealand’s North Island
MODIS satellite image of New Zealand’s North Island
MODIS satellite image of New Zealand’s North Island
MODIS satellite image of New Zealand’s North Island

MODIS satellite image of New Zealand’s North Island acquired on October 23, 2002 (https://earthobservatory.nasa.gov/images/3101/new-zealand).  Lake Taupō is located in the center of North Island.

Map of the northwestern U.S., showing the approximate locations of Yellowstone hotspot volcanic fields (orange) and Columbia Riv
Locations of Yellowstone hotspot volcanic fields
Locations of Yellowstone hotspot volcanic fields
Locations of Yellowstone hotspot volcanic fields

Map of the northwestern U.S., showing the approximate locations of Yellowstone hotspot volcanic fields (orange) and Columbia River Basalts (gray). Boundary of Yellowstone National Park is shown in yellow. Modified from Barry et al. (GSA Special Paper 497, p.

Map of the northwestern U.S., showing the approximate locations of Yellowstone hotspot volcanic fields (orange) and Columbia River Basalts (gray). Boundary of Yellowstone National Park is shown in yellow. Modified from Barry et al. (GSA Special Paper 497, p.

Scientist from the USGS collects a gas sample into an evacuated/vac...
Scientist from the USGS collects a gas sample into an evacuated/vac...
Scientist from the USGS collects a gas sample into an evacuated/vac...
Scientist from the USGS collects a gas sample into an evacuated/vac...

Scientist from the USGS collects a gas sample into an evacuated/vacuum flas from a steam vent near the Shoshone Geyser Basin.

image related to volcanoes. See description
Kīlauea summit
Kīlauea summit
Kīlauea summit

Collapse of Kīlauea's caldera floor has exposed South Sulphur Bank, prominent in the mid-19th century but covered as lava flows filled the caldera. The flat top of the white deposit shows how high the caldera fill reached. As the caldera floor dropped in mid-June 2018, South Sulphur Bank was again exposed.

Collapse of Kīlauea's caldera floor has exposed South Sulphur Bank, prominent in the mid-19th century but covered as lava flows filled the caldera. The flat top of the white deposit shows how high the caldera fill reached. As the caldera floor dropped in mid-June 2018, South Sulphur Bank was again exposed.

Obsidian Cliff, Yellowstone National Park....
Obsidian Cliff, YNP.
Obsidian Cliff, YNP.
Obsidian Cliff, YNP.

Obsidian Cliff exposes the interior of a thick rhyolite lava flow erupted about 180,000 years ago. The vertical columns are cooling fractures that formed as the thick lava flow cooled and crystallized. The flow consists of obsidian, a dark volcanic glass.

Obsidian Cliff exposes the interior of a thick rhyolite lava flow erupted about 180,000 years ago. The vertical columns are cooling fractures that formed as the thick lava flow cooled and crystallized. The flow consists of obsidian, a dark volcanic glass.

Color photograph of island from space
NASA Astronaut image of Ta'u Island
NASA Astronaut image of Ta'u Island
NASA Astronaut image of Ta'u Island

NASA Astronaut image of Ta'u Island (Manu'a Islands, American Samoa) in the South Pacific Ocean.

NASA Astronaut image of Ta'u Island (Manu'a Islands, American Samoa) in the South Pacific Ocean.

Interferogram image made from InSAR monitoring, showing 1995-2001 ground uplift.
Interferogram image made from InSAR monitoring, showing 1995-2001 ground uplift in the Three Sisters.
Interferogram image made from InSAR monitoring, showing 1995-2001 ground uplift in the Three Sisters.
Interferogram image made from InSAR monitoring, showing 1995-2001 ground uplift in the Three Sisters.

About 130 mm (5 inches) of peak uplift from 1995 to 2001 is shown in this interferogram in the Three Sisters Wilderness. Magma accumulating at about 7 km (about 4.5 mi) depth is the likely cause of uplift. The area of uplift, about 20 km (12 miles) in diameter, is almost entirely within the wilderness area.

About 130 mm (5 inches) of peak uplift from 1995 to 2001 is shown in this interferogram in the Three Sisters Wilderness. Magma accumulating at about 7 km (about 4.5 mi) depth is the likely cause of uplift. The area of uplift, about 20 km (12 miles) in diameter, is almost entirely within the wilderness area.

Sherman Crater, to the left of the true summit, at Mount Baker, Was...
Sherman Crater, to left of the true summit, at Mount Baker, WA
Sherman Crater, to left of the true summit, at Mount Baker, WA
Man with hat and sunglasses.
James Vallance.jpeg
James Vallance.jpeg
James Vallance.jpeg

James (Jim) Vallance is a Geologist with the USGS Volcano Science Center. He is based at the Cascades Volcano Observatory.

James (Jim) Vallance is a Geologist with the USGS Volcano Science Center. He is based at the Cascades Volcano Observatory.

Glacier Peak eruption history for the past 15,000 years....
Glacier Peak eruption history for the past 15,000 years.
Glacier Peak eruption history for the past 15,000 years.
Glacier Peak eruption history for the past 15,000 years.

Known eruptive episodes at Glacier Peak during the past 15,000 years. Each episode (depicted by a single icon) represents many individual eruptions. The ages of these episodes, in calendar years before present are corrected from dates based on a radiocarbon time scale.

Known eruptive episodes at Glacier Peak during the past 15,000 years. Each episode (depicted by a single icon) represents many individual eruptions. The ages of these episodes, in calendar years before present are corrected from dates based on a radiocarbon time scale.

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