Images

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

The station is a lahar monitoring station with a broadband seismometer and video camera. Data from the station use radio telemetry to send real time information to the Instituto Geofisico of Ecuador.

Join us July 25-29, 2016, for a 5-day educator workshop at Mount Rainier. The workshop features informative talks on Cascade volcanoes and volcanic processes, ideas for classroom activities, hikes into the field, and tips for organizing school field trips to visit the volcano. There is no charge for this workshop and camping is available to participants.

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

Ash buries cars and buildings after the 1984 eruption of Rabaul, Papua New Guinea.

Pyroclastic flow cartoon depicting the flow moving down the slope of a volcano through a valley.

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.

Vent activity, typical of that in summer and fall 1969 between episodes of high fountaining. The spattering is from one of two compartments that contained lava. Typically lava levels in the two compartments were different, and gas pistons might work in both but at different times.

Map showing area covered by lava flows of Mauna Ulu eruption. Note that the map was made in 1997, before diacritical marks were being used in Hawaiian place names. The two colors designate the 1969-71 and 1972-1974 parts of the eruption, respectively. In the scale, 3 km is equal to about 2 mi.

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.

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.

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.

Examples of seismograms of different types of earthquakes and tremor (constant ground shaking) recorded in Hawai‘i.

Geologic Map of Three Sisters Volcanic Cluster, Cascade Range, Oregon

CVO Open House

Mount Rainier Teacher Workshop Participants 2011

USGS-CVO building sign, Vancouver, Washington.

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