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Images related to natural hazards.
Village of Belacázar, adjacent to the river Paez. Photo taken four years after the 2008 lahar, but the trace of the deposit and destruction is still visible.
Village of Belacázar, adjacent to the river Paez. Photo taken four years after the 2008 lahar, but the trace of the deposit and destruction is still visible.
Unusually high tides, sometimes called "king tides," offer a preview of coastal flooding likely to result from rising sea level. In this photograph, taken during a king tide on February 17, 2011, waves overtop Pier 14 in San Francisco, California.
Unusually high tides, sometimes called "king tides," offer a preview of coastal flooding likely to result from rising sea level. In this photograph, taken during a king tide on February 17, 2011, waves overtop Pier 14 in San Francisco, California.
Since the opening of the Overlook vent in Halema‘uma‘u Crater in 2008, FTIR spectroscopy has been used to monitor summit eruptive-gas composition. Infrared energy emitted by the lava lake surface (top left) is absorbed by gases present in the path between the instrument and the lak surface.
Since the opening of the Overlook vent in Halema‘uma‘u Crater in 2008, FTIR spectroscopy has been used to monitor summit eruptive-gas composition. Infrared energy emitted by the lava lake surface (top left) is absorbed by gases present in the path between the instrument and the lak surface.
Thousands were saved by accurate eruption forecasts of Mount Merapi, Indonesia. House in the village of Kopeng, 6 km (3.7 miles) from summit of Mount Merapi, destroyed by the explosive eruption.
Thousands were saved by accurate eruption forecasts of Mount Merapi, Indonesia. House in the village of Kopeng, 6 km (3.7 miles) from summit of Mount Merapi, destroyed by the explosive eruption.
Blocky, non-vesicular ash particle indicative of water-magma interaction.
Blocky, non-vesicular ash particle indicative of water-magma interaction.
SEM Images of ash particles from the 1989 eruption of Redoubt Volcano, Alaska.
SEM Images of ash particles from the 1989 eruption of Redoubt Volcano, Alaska.
An HVO scientist wearing a gas mask collects GPS data using a roving instrument on the west flank of Pu‘u ‘Ō‘ō. USGS Photo.
An HVO scientist wearing a gas mask collects GPS data using a roving instrument on the west flank of Pu‘u ‘Ō‘ō. USGS Photo.
Sitka, AK.
Absolutes and variations buildings at Sitka, AK magnetic observatory.
Absolutes and variations buildings at Sitka, AK magnetic observatory.
Electronics building at Sitka magnetic observatory Alaska.
Electronics building at Sitka magnetic observatory Alaska.
Absolutes building at Sitka magnetic observatory Alaska.
Absolutes building at Sitka magnetic observatory Alaska.
An HVO scientist and volunteer work to upgrade the power system of a seismic station located in the Ka‘ū desert on Kīlauea's southwest rift zone. USGS Photo.
An HVO scientist and volunteer work to upgrade the power system of a seismic station located in the Ka‘ū desert on Kīlauea's southwest rift zone. USGS Photo.
Gas sampling from a fumarole on the rim of Halema‘uma‘u Crater within Kīlauea caldera, Hawai‘i.
Gas sampling from a fumarole on the rim of Halema‘uma‘u Crater within Kīlauea caldera, Hawai‘i.
An HVO geologist uses GPS to map and track the progress of an ‘A‘ā lava flow in Royal Gardens subdivision in 2008. USGS photo.
An HVO geologist uses GPS to map and track the progress of an ‘A‘ā lava flow in Royal Gardens subdivision in 2008. USGS photo.
An HVO scientist collects gravity data from a site on the rim of Kīlauea caldera. The active summit vent in Halema‘uma‘u Crater is visible in the background. USGS photo.
An HVO scientist collects gravity data from a site on the rim of Kīlauea caldera. The active summit vent in Halema‘uma‘u Crater is visible in the background. USGS photo.
Estimated coastal inundation (blue shading) at Mission Bay in San Diego, California, using the Coastal Storm Modeling System (CoSMoS) developed for ARkStorm. (From USGS Open-File Report 2010-1312.)
Estimated coastal inundation (blue shading) at Mission Bay in San Diego, California, using the Coastal Storm Modeling System (CoSMoS) developed for ARkStorm. (From USGS Open-File Report 2010-1312.)
Map of Kīlauea Volcano showing the south-southeast motion, as recorded by continuous GPS sites (arrows), and earthquake epicenter between February 1-3, 2010.
Map of Kīlauea Volcano showing the south-southeast motion, as recorded by continuous GPS sites (arrows), and earthquake epicenter between February 1-3, 2010.
Location of earthquakes as a function of depth and size in the northeastern Caribbean.
Location of earthquakes as a function of depth and size in the northeastern Caribbean.
Comparison of observed near-bed velocities and modeled near-bed velocities using several bottom-roughness formulations. Velocity vectors are overlaid on map of backscatter from the sea floor showing regions with coarse sand (light color) and fine sand (dark colors). White lines are bathymetry contours.
Comparison of observed near-bed velocities and modeled near-bed velocities using several bottom-roughness formulations. Velocity vectors are overlaid on map of backscatter from the sea floor showing regions with coarse sand (light color) and fine sand (dark colors). White lines are bathymetry contours.
Simulation results for geomorphic change in Suisun Bay, CA (Ganju and Schoellhamer, 2010)
Simulation results for geomorphic change in Suisun Bay, CA (Ganju and Schoellhamer, 2010)
The Instrumented Pressure Testing Chamber (IPTC). A device for measuring the physical properties of naturally-occurring, hydrate-bearing sediment at nearly in situ pressure conditions
The Instrumented Pressure Testing Chamber (IPTC). A device for measuring the physical properties of naturally-occurring, hydrate-bearing sediment at nearly in situ pressure conditions