Unified Interior Regions

California

The Southwest Region includes California, Nevada, and Arizona. The Regional Office, headquartered in Sacramento, provides Center oversight and support, facilitates internal and external collaborations, and works to further USGS strategic science directions.

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Bishop Tuff formed from the eruption that created the Long Valley C...
October 29, 1987

Bishop Tuff formed from eruption that created the Long Valley Caldera

This outcrop is exposed in a rock quarry in Chalfant Valley about 25 km (15 mi) southwest of Long Valley Caldera. The two main units of the Bishop Tuff deposit are visible here: (1) the lower 5 m (16 f) of the section consists of the pumice that fell to the ground (airfall pumice) downwind from the eruption; and (2) the upper 5-6 m (16-20 f) of the section consists of the

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Aerial view of Inyo Craters, CA.
December 31, 1984

Inyo Craters, part of the Mono-Inyo Chain, Long Valley region, Ca

Inyo Craters, part of the Mono-Inyo Chain, Long Valley region, California.

Red Cones near Mammoth Mountain, viewed from the air toward the eas...
December 31, 1982

Red Cones near Mammoth Mountain, viewed from the air toward east-NE

The breach in the rims of both Red Cones cinder cones occurred when lava poured through the breaches and spilled about 1.5 km (1 mi) down the east valley wall of the Middle Fork of the San Joaquin River (to the left of this image).

Hummocky terrain of the debris avalanche north of Mount Shasta. ...
September 22, 1982

Hummocky terrain of the debris avalanche north of Mount Shasta.

Hummocky terrain of the debris avalanche north of Mount Shasta.

Coso Range geothermal well...
January 1, 1980

Coso Range geothermal well

First geothermal well drilled at Coso geothermal area, south-central California, by private industry. It, together with a few other wells, has been developed to feed steam into the initial powerplant. Photo from USGS Circular 1249.

Negit Island in Mono Lake, California.
December 31, 1978

Negit Island in Mono Lake, CA viewed toward the NW.

Negit Island in Mono Lake, California viewed toward the NW. The three parallel dacite lava flows that form the island are clearly visible.

Mount Konocti on the western shore of Clear Lake, California
December 31, 1975

Mount Konocti on the western shore of Clear Lake, California

Mount Konocti, a mostly dacitic composite cone, on the western shore of Clear Lake, California. Thurston Lake is in the foreground.

asbestos
December 31, 1969

Tremolite Asbestos

Tremolite asbestos, Death Valley, California.

A building after an earthquake has crumbled the roof and brick walls, the interior is now visible.
March 26, 1933

Long Beach Earthquake Damage

View of John Muir School on Pacific Avenue in Long Beach, California, showing damage from the March 10, 1933 Long Beach earthquake. Photo taken 8 days after the earthquake, on March 18, 1933. Photo by W.L. Huber, USGS.

Coso hot springs, black and white image
February 4, 1920

Coso Hot Springs located at Coso Volcanic Field, CA

Coso Hot Springs in Coso volanic fields, Feb 4, 1920.

View from the sky of a city and its waterfront with various ships docked, and most buildings on land are ruined.
May 28, 1906

San Francisco in ruins, 1906

One of the most well-known photographs by George R. Lawrence, taken May 28, 1906, about 6 weeks after the Great San Francisco earthquake which occurred on April 18. The 160-degree panorama was taken from a camera suspended from a kite 2,000 feet in the air. The view looks up Market Street with the waterfront and Union Ferry Building in the foreground.

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