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.

States L2 Landing Page Tabs

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Bubbling Spring, a feature of Hot Creek in the Long Valley Caldera,...
August 17, 2009

Bubbling Spring, a feature of Hot Creek in the Long Valley Caldera,...

Bubbling Spring, a feature of Hot Creek in the Long Valley Caldera, California, occasionally "boils" due to high water temperature.

Soil-temperature measurement at Hot Creek in Long Valley Caldera, C...
August 17, 2009

Soil-temperature measurement at Hot Creek in Long Valley Caldera, CA.

Soil-temperature measurement at Hot Creek in Long Valley Caldera, California.

July 30, 2009

PubTalk 7/2009 — Restoring California's "Inland Sea"

Status of efforts to restore the Salton Sea

by Lee Case, Chief Scientist, USGS Salton Sea Science Office 

 

  • The Salton Sea is California's largest lake and has a surface elevation about 230 feet below sea level
  • The Salton Sea is a terminal lake - it has no outlets, inflows are principally from agricultural
water discharging from a well along the All-American Canal
July 28, 2009

All-American Canal

The All-American Canal in Imperial County, California near the border of Arizona and Mexico. Water discharging from well LCWSP2 can be seen on the far side of the canal.

Image: California Cliffs and Coastline
July 1, 2009

California Cliffs and Coastline

Colorful vegetated clifftop near Half Moon Bay, California.

Attribution: Water Resources
Marine terraces in California
June 30, 2009

Marine Terraces near Santa Cruz, CA

Marine terraces North of Santa Cruz, California.  For information on terrace formation https://pubs.er.usgs.gov/publication/fs20183002 

Forster Tern standing
June 30, 2009

Forster's Tern Attraction Tape

A sample of the audio file of Forster's tern colony calls that will be broadcast to attract breeding terns to islands in south San Francisco Bay.

June 25, 2009

PubTalk 6/2009 — Tracking Mercury from Ore to Organism

Mercury Cycling and Bioaccumulation In a Mine-Dominated Ecosystem

By Tom Suchanek, USGS Western Ecological Research Center

 

  • Nearly 300 abandoned mercury mines and prospects are found in the California Coast Range-- the Sulphur Bank Mercury Mine at Clear Lake, CA is one of them
  • Clear Lake is one of the most
GPS station mounded on a tripod next to a groundwater well in the desert
June 18, 2009

Groundwater Monitoring, Imperial County, California

Recording location and water-level data at a groundwater monitoring site in the Imperial Sand Dunes Recreation area, Imperial County, California. The work is being done as part of a water quality and groundwater system characterization study along the All-American Canal that runs through the area.

Image: California Brown Pelican
June 11, 2009

California Brown Pelican

Birds found in and around the Salton Sea, California.

Attribution:
Image: California Brown Pelican
June 11, 2009

California Brown Pelican

Birds found in and around the Salton Sea, California.

Image: California Brown Pelicans
June 11, 2009

California Brown Pelicans

Birds found in and around the Salton Sea, California.

Attribution:
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USGS
June 20, 2002

The application of the pesticide diazinon on orchards, and the amounts found in rivers and streams in the Sacramento and San Joaquin Basins in Northern California, were considerably lower in 2000 than in the 1990s according to two recently released reports by the U.S. Geological Survey (USGS).

USGS science for a changing world logo
June 11, 2002

Equipped with binoculars and spotting scopes, scientists and skilled volunteers paired up onshore. Other crews were airborne. Together they scanned 375 miles along the California coast for sea otters during May, from Half Moon Bay south to Santa Barbara.

USGS
June 11, 2002

Equipped with binoculars and spotting scopes, scientists and skilled volunteers paired up onshore. Other crews were airborne. Together they scanned 375 miles along the California coast for sea otters during May, from Half Moon Bay south to Santa Barbara.

USGS
April 26, 2002

Unexploded shells. Contaminated soils. Polluted groundwater. Military bases across the country are working to restore and protect the environment.

USGS science for a changing world logo
April 24, 2002

While it is known that pre-Columbian peoples of North America used fire as a tool to manage natural resources, scientists have long debated the impact of this usage of fire on the landscape. 

USGS
April 24, 2002

While it is known that pre-Columbian peoples of North America used fire as a tool to manage natural resources, scientists have long debated the impact of this usage of fire on the landscape.

USGS science for a changing world logo
February 25, 2002

Above the water it’s a rugged shoreline and a few jagged rocks adorned with bird droppings. Below the surface, however, the Gulf of the Farallones, west of the Golden Gate Bridge, encompasses an area of 4,000 square miles of sea floor, marine life and mysterious objects that may be affecting the area’s environment.

USGS
February 25, 2002

Above the water it’s a rugged shoreline and a few jagged rocks adorned with bird droppings. Below the surface, however, the Gulf of the Farallones, west of the Golden Gate Bridge, encompasses an area of 4,000 square miles of sea floor, marine life and mysterious objects that may be affecting the area’s environment.

USGS science for a changing world logo
February 6, 2002

The United States and the People’s Republic of China share a common problem ? elevated nitrate concentrations in water supplies used for drinking water, according to a recently released report by the U.S. Geological Survey (USGS). While elevated concentrations of nitrate in water have been known to cause illness in babies, there is also indirect evidence that they can cause cancer. 

USGS science for a changing world logo
January 30, 2002

University of Utah seismologists will be on duty around-the-clock during the Olympics, armed with a new $1.2 million system so they can quickly supply public safety information if any disruptive earthquakes shake the 2002 Winter Games.

USGS science for a changing world logo
December 13, 2001

There is science and there is spirit. Sometimes the two twine at apt times. So it is that, in the spirit of an ancient, but ageless Santa Claus, the General Grant Tree-- officially designated in 1926 as the Nation’s Christmas tree by President Calvin Coolidge -- just keeps getting younger.

USGS science for a changing world logo
December 13, 2001

 

Stress changes produced by the 1906 San Francisco earthquake had a profound effect on Bay Area seismicity by dramatically reducing it in the 20th century, according to David Schwartz, of the U.S. Geological Survey in Menlo Park, Calif.