Images

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.

Michael Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory.

Featured speaker from Colombia discusses lahars at Orting, Washington, event.

Mount Rainier 2018 Teacher Workshop

The USGS-Cascades Volcano Observatory opens its doors to the public on Saturday, May 12, for a one-day open house. Scientists will be on-hand from 10:00 am to 5:00 pm to share the results of their research and talk about volcano hazards. Hands-on activities and equipment demonstrations will be featured.

View of Mount Baker from the west. Summit area draped with aerial imagery from National Agriculture Imagery Program (NAIP) collected in September 2015. Digital topography from High-resolution digital elevation dataset for Mount Baker and vicinity, Washington, based on lidar surveys of 2015: U.S.

Relative explosiveness and resulting height of eruption columns typically associated with different styles of eruption

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

Map Showing Outbreak Progression In 1956

Scientists monitor data in the California Volcano Observatory operations room, Menlo Park, California.

Table of ash fall severities based on accumulated thickness.

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

Collapsed roofs after severe ashfall from Galunggung Volcano, West Java, Indonesia.

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

Dusting of Klyuchevskoy ash on camera bag, 2006.

Trace of Augustine ash on car hood, Homer, Alaska, January 2006.