Unified Interior Regions


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.

States L2 Landing Page Tabs

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Mount Konocti viewed from Cinder Cone, Clear Lake Volcanic Field.
December 31, 1905

Mount Konocti viewed from Cinder Cone, Clear Lake Volcanic Field.

Mount Konocti, the most distinct volcanic feature of the Clear Lake Volcanics as viewed to the west from Cinder Cone.

old black and white photo of collapsed building, with inset image of the building before collapse
December 31, 1868

Alameda County Courthouse (Calif.) before and after 1868 Earthquake

Strong shaking during the 1868 Hayward Fault earthquake caused the second story of the Alameda County Courthouse in San Leandro to collapse (photo courtesy of the Bancroft Library, University of California). The inset photo shows the courthouse before the quake

Santa Cruz Main Beach, El Nino

Photographs are of the Santa Cruz Main Beach before and after the December 11, 2014, “Super Soaker” storm that brought 2.5 inches of rain in just a few hours to Santa Cruz and 9 inches to Boulder Creek, along with big waves and swell. While the human eye may notice changes to the beach, ground-based lidar can create surface maps of precise elevation changes over time.

View from a building top looking down on a sandy beach with beachgoers, pier extending into water, amusement park in background.

Santa Cruz Main Beach video camera 1 snapshot

Video camera snapshot overlooking Main Beach in Santa Cruz, California, looking eastward. Learn more about the cameras and how we're using them to study coastal change.

A view from atop a coastal bluff looking at a sandy beach, waves, and ocean, dark shows no movement and light shows movement.

Sunset Beach Camera 2 Variance

Video camera variance image at Sunset State Beach in Watsonville, California, looking north. Learn more about the cameras and their imagery, and how we're using them to study coastal change.


TNMCorps Mapping Challenge: Fire Stations in CA, NV, AZ as of 02/11/21

TNMCorps Mapping Challenge: Fire Stations in CA, NV, AZ as of 02/11/21

View from the sky of a landscape with a river running through it, and the river is winding back and forth.

Mokelumne River Bathymetry

A winding strip of rainbow colors shows the bathymetry (depth) of the bed of the Mokelumne River just above its confluence with the San Joaquin in the Sacramento-San Joaquin River Delta east of San Francisco Bay. USGS scientists mapped the channel as part of a project to