Images

CVO Open House

Geologic Hazards at Volcanoes. To download the full poster click here.

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).

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.

Field-trip guide to Columbia River flood basalts, associated rhyolites, and diverse post-plume volcanism in eastern Oregon available at https://pubs.er.usgs.gov/publication/sir20175022O.

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).

American and Colombian exchange participants among the ruins in Amero, which was destroyed by an eruption of Nevado del Ruiz in 1985.

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.

Panoramic image of Belacázar Village eight years after the 2008 lahar innundation. Lahar deposits in the foreground of the town are now soccer fields and a dirt bike track.

U.S. and Chilean scientists prepare for a research flight during the 2008 VDAP eruption response at Chaitén.

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.

Sideromelane and tachylite shards collected 12 km from source at Mount Etna, 2002. The width of view is 1 mm

Heavy ashfall (20-30 mm) from Tungurahua, Ecuador, 2006.

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.