Images

Mount Adams viewed from the southeast in Klickitat Valley, Washington.

Map of horizontal displacement vectors for Global Positioning System (GPS) stations in and around Mount St. Helens. Blue arrows show the direction and magnitude of horizontal movement, as measured at the GPS station from 2008-2014. The total horizontal displacement is indicated in millimeters (mm) and inches (in).

The Uwekahuna WT (water-tube) instrument is still measured today, providing one of the longest records of deformation for any volcano. The tiltmeter is read by looking into the portal on each pot and adjusting the sight until two pins appear to touch.

The Uwīkahuna WT (water-tube) instrument is still measured today, providing one of the longest records of deformation for any volcano. The tiltmeter is read by looking into the portal on each pot and adjusting the sight until two pins appear to touch.

Big Pine Volcanic Field, California, from southwest cinder cone, with US Route 395 and Owens River in view

Coconut grove and campground on the southern shoreline of Kīlauea Volcano at Halapē before 1975 magnitude 7.7 earthquake. Halapē was a popular hiking destination in Hawai‘i Volcanoes National Park.

Recent light detection and ranging (lidar) imagery has allowed us to identify and map a large number of previously unrecognized landslides, or slides, in heavily forested terrain in the western Columbia Gorge, Skamania County, Washington, and it has revealed that the few previously recognized areas of instability are actually composites of multiple smaller landslide

Shaded relief map of Kīlauea Volcano's summit with caldera bounding faults delineated.

Seismic hazard across the State of Hawaii, with high seismic hazards depicted with warm colors (red-orange) and relatively low seismic hazards depicted with cool colors (green). Engineers use these types of maps to prescribe building codes known as Seismic Design Codes (SDC) and create earthquake resistant structures.

Vectors indicate Pacific Plate motion relative to presumed fixed mantle hot spot in millimeters per year. Gray lines indicate fracture zones. Isochrons along the Emperor Seamounts chain show the age of volcanism in millions of years. Ocean floor ages from imagery available on EarthByte.

Mount Adams elevation is 3,745 m (12, 286 ft). Mount St. Helens was the smallest of five major volcanic peaks in Washington State.

Family Emergency Preparedness Plan

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 Three Sisters Volcanic Cluster, Cascade Range, Oregon

USGS-CVO building sign, Vancouver, Washington.

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

Eruption of Soufriere Hills, Montserrat, November 2009

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.

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.