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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Aerial view of lava tube across landscape
December 31, 2012

A lava tube trace (dark sinuous shape) along the ground surface.

Aerial view of a lava tube trace (dark sinuous shape) along the ground surface at Medicine Lake Volcano, California.

map of California shaded by GAMA shallow aquifer study units
December 31, 2012

USGS GAMA Domestic Well (Shallow Aquifer) Assessment Study Units

In 2012, the Groundwater Ambient Monitoring & Assessment Priority Basin Project (GAMA-PBP) began water-quality assessments of shallow aquifers, the groundwater resources typically used for private domestic and small system drinking-water supplies. These groundwater resources often are shallower than the groundwater resources used for public drinking-water supplies.

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Volcano hazard zone map for Lassen Volcanic Region in Northern Cali...
December 31, 2012

Volcano hazard zone map for Lassen Volcanic Region in Northern CA p...

Volcanic Hazard Assessment for the Lassen Region, California is based upon a comprehensive investigation of the eruptive history and possible future eruption scenarios with associated volcanic hazards.

Oblique-angle illustration showing the seafloor offshore of Half Moon Bay, California, with bumps of bedrock protruding.
December 31, 2012

Seafloor Offshore of Half Moon Bay

Perspective view of seafloor offshore of Half Moon Bay, showing scarp (arrows) along the eastern strand of the San Gregorio fault zone. Rocks are notably upwarped and folded adjacent to the fault.

Tumulus of basalt lava makes Captain Jack's stronghold.
December 31, 2012

A tumulus at Captain Jack's stronghold within Lava Beds National Mo...

A tumulus at Captain Jack's stronghold within Lava Beds National Monument .

December 13, 2012

PubTalk 12/2012 — Colorful South Pacific Species

--New Discoveries and Looming Threats

by Robert Fisher, Research Biologist

 

  • Exciting discoveries are spurring research to uncover hidden secrets deep within South Pacific tropical forests
  • A scientific expedition roaming the tropical forests of Papua New Guinea recently discovered a new species dubbed the "
November 15, 2012

PubTalk 11/2012 — Understanding Climate-Wildlife Relationships

-- are American pikas harbingers of changing conditions?

by USGS Research Ecologist Erik Beever

 

  • American pikas are denizens of rocky talus and lava-flow habitats in mountain ecosystems across western North America
  • Mountain environments, cauldrons of climatic harshness, exhibit sharp topographic, vegetative, and
October 25, 2012

PubTalk 10/2012 — Exploring Mars With Curiosity

by Ken Herkenhoff, USGS Astrogeology Science Center

 

  • The Mars Science Laboratory rover "Curiosity" landed successfully on August 5th to begin its 23 month mission
  • What have scientists discovered so far, particularly with respect to the geology of the Gale crater landing site?
  • Instruments aboard Curiosity are searching
September 27, 2012

PubTalk 9/2012 — Pacific Nearshore Ecosystem Mysteries

--from kelp forests to fisheries, sea otters aid in studying ocean vitality

by USGS Research Wildflife Biologist James Bodkin

 

  • Nearshore marine ecosystems face unprecedented challenges, regionally and globally, with threats from adjacent lands and oceans
  • Sea otter populations are experiencing reduced rates of
September 14, 2012

Living with Fire: Fire Decision Model

Southern California's fire ecology is unlike that of anywhere else in the United States. Fire control strategies developed for mountain forests don't have the same results here. So can science help uncover new answers to help Southern California communities manage and live with wildfires? This 10 minute film showcases ongoing USGS research supporting agencies on the

September 14, 2012

Living with Fire: Location Factors

Southern California's fire ecology is unlike that of anywhere else in the United States. Fire control strategies developed for mountain forests don't have the same results here. So can science help uncover new answers to help Southern California communities manage and live with wildfires? This 10 minute film showcases ongoing USGS research supporting agencies on the

September 14, 2012

Living with Fire: Prescribed Burning

Southern California's fire ecology is unlike that of anywhere else in the United States. Fire control strategies developed for mountain forests don't have the same results here. So can science help uncover new answers to help Southern California communities manage and live with wildfires? This 10 minute film showcases ongoing USGS research supporting agencies on the

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USGS
August 3, 2005

The San Andreas Fault Observatory at Depth (SAFOD) reached a significant goal on Aug. 2 when scientists drilled into a seismically active section of the fault approximately two miles below the surface of the Earth.

USGS
August 1, 2005

In its latest report on water use in the United States, the USGS looked at the nation's dependence on ground water. The report entitled Estimated Withdrawals from Principal Aquifers in the United States, 2000, provides details of ground-water withdrawals and use from principal aquifers in each state.

USGS science for a changing world logo
July 5, 2005

Observers tallied a total of 2,735 California sea otters for the 2005 spring survey, led by scientists at the U.S. Geological Survey (USGS). The 2005 total showed a 3.2 percent decrease in otters from the 2004 record high of 2,825.

USGS
July 5, 2005

Observers tallied a total of 2,735 California sea otters for the 2005 spring survey, led by scientists at the U.S. Geological Survey (USGS). The 2005 total showed a 3.2 percent decrease in otters from the 2004 record high of 2,825.

USGS science for a changing world logo
June 30, 2005

In a pioneering study, a USGS-led team has tracked a surf scoter from its coastal wintering area in San Francisco Bay to pinpoint its nest, 2000 miles away in the vast northern boreal forest of interior Canada.

USGS
June 30, 2005

In a pioneering study, a USGS-led team has tracked a surf scoter from its coastal wintering area in San Francisco Bay to pinpoint its nest, 2000 miles away in the vast northern boreal forest of interior Canada.

USGS
May 25, 2005

Infrequent but Deadly Earthquakes Pose Hazard, Show Need for Preparedness

USGS science for a changing world logo
May 18, 2005

The U.S. Geological Survey (USGS) announced today the release of new public web pages that show the probability of earthquake shaking in the next 24 hours in California. These maps graphically illustrate the change in earthquake probability during aftershock and possible foreshock sequences.

USGS
May 18, 2005

The U.S. Geological Survey (USGS) announced today the release of new public web pages that show the probability of earthquake shaking in the next 24 hours in California. These maps graphically illustrate the change in earthquake probability during aftershock and possible foreshock sequences.

USGS science for a changing world logo
May 5, 2005

Potential earthquakes on the Puente Hills fault beneath the Los Angeles area could result in 3,000 to 18,000 fatalities, 142,000 to 735,000 displaced households, and more than $250 billion in total damages, according to U.S. Geological Survey (USGS) and Southern California Earthquake Center (SCEC) research.

USGS science for a changing world logo
April 29, 2005

Reston, VA – The U.S. Geological Survey (USGS) today released the first ever comprehensive and systematic review of the 169 U.S. volcanoes and established a framework for a National Volcano Early Warning System (NVEWS) which calls for a 24-hour seven-day-a-week Volcano Watch Office and enhanced instrumentation and monitoring at targeted volcanoes.