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Volcano Hazard Program images.
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.
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.
Mount Rainier 2014 Teacher Workshop
Mount Rainier 2014 Teacher Workshop
For Volcano Preparedness Month in Washington State, Carolyn Driedger (USGS-Cascades Volcano Observatory) and Zane Gibson (Fire Chief, Orting Valley Fire and Rescue) share the story of their visit to Colombia's Nevado del Ruiz volcano and valuable lessons learned for resident near Mount Rainier.
For Volcano Preparedness Month in Washington State, Carolyn Driedger (USGS-Cascades Volcano Observatory) and Zane Gibson (Fire Chief, Orting Valley Fire and Rescue) share the story of their visit to Colombia's Nevado del Ruiz volcano and valuable lessons learned for resident near Mount Rainier.
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
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
Flow chart illustrating the many variables influencing ash-induced insulator flashover.
Flow chart illustrating the many variables influencing ash-induced insulator flashover.
Streamflow measurement and water sampling at Paradise Creek are part of the regular measurements taken during hydrothermal monitoring campaigns at Mount Rainier, Washington.
Streamflow measurement and water sampling at Paradise Creek are part of the regular measurements taken during hydrothermal monitoring campaigns at Mount Rainier, Washington.
Village of Belalcázar along the Páez River in Colombia. Photograph taken in 2006 - note river bank vegetation and soccer pitch is restored in 12 years after 1994 lahar.
Village of Belalcázar along the Páez River in Colombia. Photograph taken in 2006 - note river bank vegetation and soccer pitch is restored in 12 years after 1994 lahar.
Scientists monitor data in the California Volcano Observatory operations room, Menlo Park, California.
Scientists monitor data in the California Volcano Observatory operations room, Menlo Park, California.
Graph shows thickness of ash (and larger-sized particles within 20-40 km) that fell to the ground downwind of Mount St. Helens during the eruption on May 18, 1980. The volcano ejected a minimum of 1.1 km3 of uncompacted tephra, which is equivalent to 0.20-0.25 km3 of magma or solid rock.
Graph shows thickness of ash (and larger-sized particles within 20-40 km) that fell to the ground downwind of Mount St. Helens during the eruption on May 18, 1980. The volcano ejected a minimum of 1.1 km3 of uncompacted tephra, which is equivalent to 0.20-0.25 km3 of magma or solid rock.
Heavy ashfall (20-30 mm) from Tungurahua, Ecuador, 2006.
Heavy ashfall (20-30 mm) from Tungurahua, Ecuador, 2006.
Dusting of Klyuchevskoy ash on camera bag, 2006.
Dusting of Klyuchevskoy ash on camera bag, 2006.
USGS-CVO building sign, Vancouver, Washington.
USGS-CVO building sign, Vancouver, Washington.
Geologic Map of Three Sisters Volcanic Cluster, Cascade Range, Oregon
Geologic Map of Three Sisters Volcanic Cluster, Cascade Range, Oregon
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 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.