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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February 24, 2014

PubTalk 2/2014 — 1964 Great Alaska Earthquake and Tsunami 50th Anniv.

By George Plafker, USGS Geologist Emeritus

 

  • March 27th, 1964, one of the most violent earthquakes of all time rocked southern Alaska.
  • More than 50,000 square miles of the state was tilted to new elevation, and the resulting property damage disrupted the state's economy.
  • Within 24 hours, a team of USGS geologists
Attribution: Region 11: Alaska
Illustration showing the contours of the bay floor underwater and the relief of surrounding hills, and dots.
December 31, 2013

Sediment sample locations

Gray shaded-relief image (or map) is used to provide a 3D representation of the floor of San Francisco Bay, or bathymetry (water depth). The land surrounding San Francisco Bay is colored to also provide a 3D representation of relief, or topography (land elevation). Locations of USGS sediment samples collected in winter 2008 within the San Francisco Bay study area are shown

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Map of land subsidence in the San Joaquin Valley form 1926-1970, shaded by amount of subsidence in meters
December 31, 2013

Land subsidence in the San Joaquin Valley, California, 1926–70

The extensive withdrawal of groundwater from the unconsolidated deposits of the San Joaquin Valley has caused widespread land subsidence—locally exceeding 8.5 meters (m) between 1926 and 1970 (Poland and others, 1975; fig. 2), and reaching 9 m by 1981 (Ireland, 1986). Long-term groundwater-level declines can result in a vast one-time release of “water of compaction” from

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map of the Anza-Terwilliger area shaded by geologic type
December 31, 2013

Geology of the Anza-Terwilliger Area, California

Generalized surface geology of the Anza–Terwilliger study area, Riverside and San Diego Counties, California (modified from
Rogers, 1965).

December 31, 2013

2013 United Launch Alliance ULA L8 Launch Highlights

A highlights video from the 2013 launch of Landsat 8.
 

A narrow waterway, in a wet, marshy area with brown grasses, winds its way to a larger body of water, hills in the background.
December 4, 2013

Estuarine salt marsh of San Francisco Bay

Photo for upcoming seminar titled, “Sediment delivery across the bay-marsh interface of an estuarine salt marsh,” by Jessie Lacy.

October 7, 2013

Animal Interactions at Wind Energy Facilities – Gray Fox

There were two documented gray fox visits at the burrows, making them the third most documented predator. Gray foxes are implicated predators of various life stages of desert tortoises, but it is difficult to catch them in the act. In this case, a gray fox approaches a burrow, and thoroughly investigates the burrow mouth. The fox develops an arch in its tail (slight

October 5, 2013

Animal Interactions at Wind Energy Facilities – Western Spotted Skunk

There was one documented skunk event captured on camera - the least documented predator. Here, a western spotted skunk is thoroughly investigating the burrow of one of the marked female tortoises in the study population. Western spotted skunks are known predators of turtle eggs. The skunk investigated the area within the burrow for a full minute before it appears outside

Image: Rocky and Sandy Seafloor Offshore California
September 30, 2013

Rocky and Sandy Seafloor Offshore California

Image of ripples in sand, next to a rocky surface on the seafloor 2.5 km (1.5 miles) offshore San Mateo County, California at a depth of 24.6 meters (81 feet). The two red dots in the image (from lasers mounted on the camera and used as reference points) are 15 cm (6 inches) apart.

 

Attribution: Natural Hazards
Tephra provides clues to eruptive history of Medicine Lake Volcano,...
September 17, 2013

Tephra provides clues to eruptive history of Medicine Lake Volcano, CA

Geologists examine tephra deposits to better understand the early eruptive behavior of the Medicine Lake Volcano, evidence of which can be found as far away as central Oregon. Widespread tephra deposits form stratigraphic markers that help decipher eruptive histories at other volcanoes in the region and are sometimes used by archeologists to help determine the age of

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August 31, 2013

Busy Day in the Sed Lab

Time lapse video of Angela Tan working in a USGS sediment analysis laboratory. More at https://walrus.wr.usgs.gov/labs/coresedlab.html

two men wearing hard hats carrying a 4-foot long auger in a grassy field
August 17, 2013

USGS scientists carrying an auger to a drill hole for seismic survey

USGS scientists Robert Sickler (left) and Rufus Catchings (right) carrying an auger to a drill hole for seismic survey.

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USGS
March 9, 2006

The U.S. Geological Survey has a new website that offers a virtual tour of the Hayward fault.

USGS science for a changing world logo
February 24, 2006

Two new maps give first responders, land use planners, decision makers and Bay Area residents a new and more detailed look at the risk of "liquefaction" in the soils underlaying buildings and other important components of the Bay Area infrastructure, such as roads and pipelines.

USGS
February 24, 2006

Two new maps give first responders, land use planners, decision makers and Bay Area residents a new and more detailed look at the risk of "liquefaction" in the soils underlaying buildings and other important components of the Bay Area infrastructure, such as roads and pipelines.

Satellite image showing fire in California.
February 20, 2006

These images show the nearly 11,000 acres affected by the Sierra fire in Orange County, California, in February 2006.

USGS science for a changing world logo
February 17, 2006

Schoolyard Geology, the newest U.S. Geological Survey education website, (http://education.usgs.gov/schoolyard/) got its start in San Quentin State Prison from a USGS scientist teaching Geology 101 to inmates there.

USGS
February 17, 2006

Schoolyard Geology, the newest U.S. Geological Survey education website, (http://education.usgs.gov/schoolyard/) got its start in San Quentin State Prison from a USGS scientist teaching Geology 101 to inmates there.

USGS
February 8, 2006

Ensuring stable water supplies has grown more complex as the challenges facing water managers continue to mount, especially in the West. Informed decisions of water users and public officials will be necessary to ensure sufficient freshwater resources in the future to support a growing population and economy. 

USGS science for a changing world logo
February 7, 2006

Reproducible images for this news release can be downloaded by clicking the thumbnail images below or visiting our image preview gallery (http://online.wr.usgs.gov/ocw/htmlmail/200601_werc/images.html ) which contains additional images for this release.

USGS science for a changing world logo
February 7, 2006

Lights enable humans to use the outside environment at night, but what does artificial illumination mean to wildlife?

USGS
February 7, 2006

Lights enable humans to use the outside environment at night, but what does artificial illumination mean to wildlife? Artificial night lighting may affect behavior of wildlife in complex ways, and may even contribute to declines in some reptile species, according to a study by the U.S. Geological Survey (USGS) and Texas Tech University published in a chapter in a new book by Island Press.

USGS science for a changing world logo
February 1, 2006

MENLO PARK, CA – The U.S. Geological Survey (USGS) is releasing two new educational resources to help teachers explain earthquake science. The educational tools are part of the USGS commemoration of the 100th anniversary of The Great Quake of 1906.

USGS
February 1, 2006

MENLO PARK, CA – The U.S. Geological Survey (USGS) is releasing two new educational resources to help teachers explain earthquake science. The educational tools are part of the USGS commemoration of the 100th anniversary of The Great Quake of 1906.