Images

LOS = Line of Sight

Example of an event-tree schematic used when forecasting the probable scenarios that may play out in the event of volcanic unrest or eruption. Scenarios are updated as events unfold.

Emergency response planning exercise for a volcanic event with Washington State and local government officials.

Drill records have found traces of previously formed shorelines (strandlines) depressed below the current sea level - further evidence of subsidence due to the added weight of the volcano.

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

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

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

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

Family Emergency Preparedness Plan

White Salmon River (Washington) at USGS gauge site, 2.3 km downstream of Condit Dam, looking downstream: (a) 53 min before breaching; (b) 20 min after breaching, at discharge peak; (c) 76 min after breaching, at peak sediment concentration, with high water line evident; (d) ~2.5 h after breaching, discharge has returned to background and sediment concentration is f

Lahar devastation after the eruption of Mount Pinatubo, Philippines.

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

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.

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.

USGS-CVO building sign, Vancouver, Washington.

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.

Geologic Map of the Washougal Quadrangle, Clark County, Washington and Multnomah County, Oregon (Scientific Investigation Map 3257).

Map showing global ash and aviation encounters

Bariloche sand filters

Eruption of Soufriere Hills, Montserrat, November 2009