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Images related to natural hazards.
Researchers map the bottom of Castle Lake, near Mount St. Helens. For three days, researchers ran a small boat over the lake surface equipped with an acoustic Doppler current profiler (ADCP). The ADCP bounces an acoustic wave off the bottom that is reflected back to a mobile receiver in the boat.
Researchers map the bottom of Castle Lake, near Mount St. Helens. For three days, researchers ran a small boat over the lake surface equipped with an acoustic Doppler current profiler (ADCP). The ADCP bounces an acoustic wave off the bottom that is reflected back to a mobile receiver in the boat.
South Sister northwest flank. Right shoulder at skyline is thin sheet of mafic material from 22ka summit eruption. Red cinders in headwall cirques are layered with dipping lava flows.
South Sister northwest flank. Right shoulder at skyline is thin sheet of mafic material from 22ka summit eruption. Red cinders in headwall cirques are layered with dipping lava flows.
Geologic Map of Three Sisters Volcanic Cluster, Cascade Range, Oregon
Geologic Map of Three Sisters Volcanic Cluster, Cascade Range, Oregon
USGS-CVO building sign, Vancouver, Washington.
USGS-CVO building sign, Vancouver, Washington.
Geologic Map of the Washougal Quadrangle, Clark County, Washington and Multnomah County, Oregon (Scientific Investigation Map 3257).
Geologic Map of the Washougal Quadrangle, Clark County, Washington and Multnomah County, Oregon (Scientific Investigation Map 3257).
Eruption of Soufriere Hills, Montserrat, November 2009
Eruption of Soufriere Hills, Montserrat, November 2009
Map showing global ash and aviation encounters
Map showing global ash and aviation encounters
Bariloche sand filters
Postshield eruption are the fourth stage of a Hawaiian volcano's evolution. A cap of evolved magma erupts to cover the surface of the volcano. Not all volcanoes have evidence for this phase.
Postshield eruption are the fourth stage of a Hawaiian volcano's evolution. A cap of evolved magma erupts to cover the surface of the volcano. Not all volcanoes have evidence for this phase.
Rejuvenated stage volcanism occurs after the volcano has moved away from the mantle hot spot. Eruptions occur in sporadic locations and may be interspersed with long periods of erosion.
Rejuvenated stage volcanism occurs after the volcano has moved away from the mantle hot spot. Eruptions occur in sporadic locations and may be interspersed with long periods of erosion.
Examples of seismograms of different types of earthquakes and tremor (constant ground shaking) recorded in Hawai‘i.
Examples of seismograms of different types of earthquakes and tremor (constant ground shaking) recorded in Hawai‘i.
An American exchange participant views the former hospital in Amero where the entire first floor was buried by lahars from Nevado del Ruiz (the second floor is visible).
An American exchange participant views the former hospital in Amero where the entire first floor was buried by lahars from Nevado del Ruiz (the second floor is visible).
U.S. and Chilean scientists prepare for a research flight during the 2008 VDAP eruption response at Chaitén.
U.S. and Chilean scientists prepare for a research flight during the 2008 VDAP eruption response at Chaitén.
Michael Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory.
Michael Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory.
View of Mount Baker from the west. Summit area draped with aerial imagery from National Agriculture Imagery Program (NAIP) collected in September 2015. Digital topography from High-resolution digital elevation dataset for Mount Baker and vicinity, Washington, based on lidar surveys of 2015: U.S.
View of Mount Baker from the west. Summit area draped with aerial imagery from National Agriculture Imagery Program (NAIP) collected in September 2015. Digital topography from High-resolution digital elevation dataset for Mount Baker and vicinity, Washington, based on lidar surveys of 2015: U.S.
Table of ash fall severities based on accumulated thickness.
Table of ash fall severities based on accumulated thickness.
Collapsed roofs after severe ashfall from Galunggung Volcano, West Java, Indonesia.
Collapsed roofs after severe ashfall from Galunggung Volcano, West Java, Indonesia.
Block diagram showing subduction of the Juan de Fuca Plate beneath the North American Plate along the Cascadia Trench, which is the western edge of the Cascadia subduction zone. Oceanic crust forms by eruptions along the Juan de Fuca Ridge.
Block diagram showing subduction of the Juan de Fuca Plate beneath the North American Plate along the Cascadia Trench, which is the western edge of the Cascadia subduction zone. Oceanic crust forms by eruptions along the Juan de Fuca Ridge.
Mount Jefferson viewed from Highway 26, Oregon.
Mount Jefferson viewed from Highway 26, Oregon.
InSAR (Interferometric Synthetic Aperture Radar) is a technique for mapping subtle ground deformation using radar images from Earth-orbiting satellites. With its global coverage and all-weather imaging capability, InSAR has become an increasingly important technique for studying volcanoes in remote regions such as the Aleutian Islands.
InSAR (Interferometric Synthetic Aperture Radar) is a technique for mapping subtle ground deformation using radar images from Earth-orbiting satellites. With its global coverage and all-weather imaging capability, InSAR has become an increasingly important technique for studying volcanoes in remote regions such as the Aleutian Islands.