Images

Minor ashfall on hay field, Augustine eruption, Homer area, Alaska, 1986.

Oceanic crust forms by eruptions along the Juan de Fuca ridge. As the Juan de Fuca plate drifts eastward, it cools, becomes more dense, and eventually dives under the less dense continental plate at the Cascadia trench.

Aerial view of Mount St. Helens, taken from the southwest.

Lava-flow hazard zone map, Hawai‘i Island

Streamflow measurement and water sampling at Paradise Creek are part of the regular measurements taken during hydrothermal monitoring campaigns at Mount Rainier, Washington.

May is Volcano Preparedness Month in Washington State.

Three images of crop damage, ash plume and cleanup for the homepage

Bariloche sand filters

During the cleanup after the 18 August 1992 eruption of Mt Spurr volcano, Alaska. The population of Anchorage used mostly wet methods to clean up the ash, creating a peak water demand which resulted in water shortages and loss of pressure in some parts of the city due to bottlenecks in the distribution system.

Early on the morning of May 18, 1980, the landslide swept into the upper North Fork Toutle River valley and came to rest within about 22 km of the volcano. The landslide deposit, however, was saturated with water, and contained snow and ice blocks from the volcano's former glaciers.

Eruption of Soufriere Hills, Montserrat, November 2009

Pyroclastic flow cartoon depicting the flow moving down the slope of a volcano through a valley.

Hood to protect air intake from ashfall for GenSet equipment in Bariloche, Argentina, following 2011-2012 eruption of Cordon Caulle volcano, Chile.

The station is a lahar monitoring station with a broadband seismometer and video camera. Data from the station use radio telemetry to send real time information to the Instituto Geofisico of Ecuador.

Geologic Map of Three Sisters Volcanic Cluster, Cascade Range, Oregon

Mount Rainier Teacher Workshop Participants 2011

USGS-CVO building sign, Vancouver, Washington.

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.

Columbian photographer Reid Blackburn's camera, recovered from the Mount St. Helens blast zone in 1980. The film in it was too damaged to yield images.

Map showing locations of airports impacted by volcanic activity. From 1980 through 2006, an average of five airports per year have been affected by volcanic activity