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Images related to natural hazards.

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Mount Hood in the not-so-far distance beyond Downtown Portland, Ore...
Mount Hood in the not-so-far distance beyond Downtown Portland, OR....
Mount Hood in the not-so-far distance beyond Downtown Portland, OR....
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.

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 ...
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 ...

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...
Glacier Peak volcano, WA reflected in pond below the Whitechuck Gla...
Glacier Peak volcano, WA reflected in pond below the Whitechuck Gla...
Stratified 275-m (900-ft) thick mid-Holocene pyroclastic flow and l...
Stratified 275-m (900-ft) thick mid-Holocene pyroclastic flow and l...
Stratified 275-m (900-ft) thick mid-Holocene pyroclastic flow and l...
Stratified 275-m (900-ft) thick mid-Holocene pyroclastic flow and l...

Visible relief in the hillside exposure is about 800-900 ft. Dusty assemblage deposit occurred approximately between 5100 and 5500 yr B.P. Magma volume of >5 km3, which is a lot for what was probably one eruptive stage. The source lava dome is gone, apparently having disintegrated entirely during extrusion and subsequent glacial interaction.

Visible relief in the hillside exposure is about 800-900 ft. Dusty assemblage deposit occurred approximately between 5100 and 5500 yr B.P. Magma volume of >5 km3, which is a lot for what was probably one eruptive stage. The source lava dome is gone, apparently having disintegrated entirely during extrusion and subsequent glacial interaction.

Hualālai Volcano (center) above Kīholo Bay on Hawai‘i Island's West...
Hualālai Volcano above Kīholo Bay on Hawai‘i Island's West Coast is...
Hualālai Volcano above Kīholo Bay on Hawai‘i Island's West Coast is...
Hualālai Volcano above Kīholo Bay on Hawai‘i Island's West Coast is...

Hualālai Volcano (center) above Kīholo Bay on Hawai‘i Island's West Coast is flanked by lava flow erupted from the volcano around 1800 (right) and 1859 Mauna Loa flow (left).

Tom Sisson At Harrat Rahat Volcanic Field...
Tom Sisson At Harrat Rahat Volcanic Field
Tom Sisson At Harrat Rahat Volcanic Field
Tom Sisson At Harrat Rahat Volcanic Field

CalVO scientist Tom Sisson studies a lava flow in the Harrat Rahat Volcanic Field in Saudi Arabia for an international collaboration with the Saudi Geological Survey to conduct a seismic and volcanic hazard assessment for the volcanic field.

CalVO scientist Tom Sisson studies a lava flow in the Harrat Rahat Volcanic Field in Saudi Arabia for an international collaboration with the Saudi Geological Survey to conduct a seismic and volcanic hazard assessment for the volcanic field.

Photograph of fractures and subsidence that occurred in a flour mix...
Photograph of fractures and subsidence that occurred in a flour mix...
Photograph of fractures and subsidence that occurred in a flour mix...
Photograph of fractures and subsidence that occurred in a flour mix...

Simulated fractures and subsidence above a widening dike (dark area at bottom) were generated in a small-scale model using a box filled with flour, sugar, and corn meal. The simulated dike (tip is dark area bottom center of photograph) consisted of two linoleum sheets taped together.

Simulated fractures and subsidence above a widening dike (dark area at bottom) were generated in a small-scale model using a box filled with flour, sugar, and corn meal. The simulated dike (tip is dark area bottom center of photograph) consisted of two linoleum sheets taped together.

Leveling measurements of the slope of the Mount St. Helens' crater ...
Leveling measurements of the slope of the Mount St. Helens' crater ...
Leveling measurements of the slope of the Mount St. Helens' crater ...
Leveling measurements of the slope of the Mount St. Helens' crater ...

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 ...
Locations of Jan 17, 2010, earthquake swarm on Madison Plateau, YNP
Locations of Jan 17, 2010, earthquake swarm on Madison Plateau, YNP
Locations of Jan 17, 2010, earthquake swarm on Madison Plateau, YNP

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 YNP, Wyoming.
Mammoth Hot Springs at YNP, Wyoming.
Mammoth Hot Springs at YNP, Wyoming.

Mammoth Hot Springs at Yellowstone National Park, Wyoming.

CalVO staff assembled in the Rambo Auditorium, Menlo Park, CA...
CalVO staff
CalVO staff
CalVO staff

CalVO staff assembled in the Rambo Auditorium, Menlo Park, CA

CalVO staff assembled in the Rambo Auditorium, Menlo Park, CA

Location of magma formation, accumulation, and storage beneath Moun...
Location of magma formation, accumulation, and storage beneath Moun...
Location of magma formation, accumulation, and storage beneath Moun...
Location of magma formation, accumulation, and storage beneath Moun...

Magma forms above the subducting slab of oceanic crust and accumulates at the base of Earth's rigid crust before collecting in a storage zone 13 km (8 mi) beneath the volcano prior to eruption.

Magma forms above the subducting slab of oceanic crust and accumulates at the base of Earth's rigid crust before collecting in a storage zone 13 km (8 mi) beneath the volcano prior to eruption.

Topographic map, Mount St. Helens, C.E. 1919 annotated with locatio...
Topographic map, Mount St. Helens, C.E. 1919 annotated with locatio...
Topographic map, Mount St. Helens, C.E. 1919 annotated with locatio...
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.

Dusty Creek drainage experiences regular lahars. Gamma Ridge Format...
Dusty Creek drainage experiences regular lahars. Gamma Ridge Format...
Dusty Creek drainage experiences regular lahars. Gamma Ridge Format...
Dusty Creek drainage experiences regular lahars. Gamma Ridge Format...

Non-volcanic peaks of the North Cascades lie in the background. Dusty Creek drainage experiences regular lahars. Gamma Ridge Formation are hydrothermally altered rocks on left ridge. Loose pyroclastic fill deposits cap right ridge; Eastern view, Glacier Peak, Washington.

Non-volcanic peaks of the North Cascades lie in the background. Dusty Creek drainage experiences regular lahars. Gamma Ridge Formation are hydrothermally altered rocks on left ridge. Loose pyroclastic fill deposits cap right ridge; Eastern view, Glacier Peak, Washington.

Exposed rock ridges are thick Pleistocene lava flows that were conf...
Exposed rock ridges are thick Pleistocene lava flows that were conf...
Exposed rock ridges are thick Pleistocene lava flows that were conf...
Exposed rock ridges are thick Pleistocene lava flows that were conf...

Exposed rock ridges are thick Pleistocene lava flows that were confined between large glaciers. Glacier Peak, Washington, view north.

Tracking the advance of Crater Glacier at Mount St. Helens, Washing...
Tracking the advance of Crater Glacier at Mount St. Helens, WA
Tracking the advance of Crater Glacier at Mount St. Helens, WA
Tracking the advance of Crater Glacier at Mount St. Helens, WA

Information regarding volume and rates of advance for the crevassed Crater Glacier at Mount St. Helens, Washington, are extracted from Digital Elevation Models created from aerial photography. The red line shows the extent of Crater Glacier in 2012. Since 2012, the glacier has advanced about 50 m (160 ft) down the Loowit channel.

Information regarding volume and rates of advance for the crevassed Crater Glacier at Mount St. Helens, Washington, are extracted from Digital Elevation Models created from aerial photography. The red line shows the extent of Crater Glacier in 2012. Since 2012, the glacier has advanced about 50 m (160 ft) down the Loowit channel.

Technologies track surface changes at Yellowstone....
Technologies track surface changes at Yellowstone.
Technologies track surface changes at Yellowstone.
Technologies track surface changes at Yellowstone.

Summer geology intern Mindy Juergenson climbs over downed lodgepole pine trees killed in the fire of 1988 as she packs a GPS station out of the field (inset). Nine temporary stations are deployed each April/May and retrieved in October/November. The temporary stations supplement a network of permanent stations that record ground deformation data year-round.

Summer geology intern Mindy Juergenson climbs over downed lodgepole pine trees killed in the fire of 1988 as she packs a GPS station out of the field (inset). Nine temporary stations are deployed each April/May and retrieved in October/November. The temporary stations supplement a network of permanent stations that record ground deformation data year-round.

Silica sinter (an amorphous form of silicon dioxide) forms from the...
Silica sinter (an amorphous form of silicon dioxide) forms from the...
Silica sinter (an amorphous form of silicon dioxide) forms from the...
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.

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