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

Filter Total Items: 533
Date published: September 20, 2011

1:1,000,000-scale potentiometric contours and control points for the Great Basin carbonate and alluvial aquifer system of Nevada, Utah, and parts of adjacent states

This dataset consists of potentiometric contours, control points used to guide the creation of the contours, and a grid of 2 square-mile cells used to average the water-level value of selected control points. Control points are based on water-level measurements at well and spring locations from the USGS National Water Information System (NWIS).

Date published: September 20, 2011

Three-dimensional hydrogeologic framework for the Great Basin carbonate and alluvial aquifer system of Nevada, Utah, and parts of adjacent states

This dataset was created in support of a study focusing on groundwater resources in the Great Basin carbonate and alluvial aquifer system (GBCAAS). The GBCAAS is a complex aquifer system comprised of both unconsolidated and bedrock formations covering an area of approximately 110,000 square miles. The aquifer system is situated in the eastern portion of the Great Basin Province of the western...

Date published: September 20, 2011

1:1,000,000-scale estimated outer extent of areas of groundwater discharge as evapotranspiration for the Great Basin carbonate and alluvial aquifer system of Nevada, Utah, and parts of adjacent states

This dataset was created in support of a study focusing on groundwater resources in the Great Basin carbonate and alluvial aquifer system (GBCAAS). The GBCAAS is a complex aquifer system comprised of both unconsolidated and bedrock formations covering an area of approximately 110,000 square miles. The aquifer system is situated in the eastern portion of the Great Basin Province of the western...

Date published: January 1, 2009

1:1,000,000-scale Hydrographic Areas of the Great Basin

This data set consists of hydrographic area and major flow system boundaries and polygons delineated at 1:1,000,000-scale for the Great Basin.

Date published: November 8, 2004

1:250,000-scale geology of the Dry Valley Hydrographic Area, Nevada and California

This dataset consists of digital geologic data for the Dry Valley Hydrographic area, Nevada and California. It was compiled from individual 1:250,000-scale geologic data for Washoe County, Nevada, 1:62,500-scale geologic data for the Chilcoot and Doyle 15' quadrangles in California and the results of field mapping within the study area in 2004. 

Filter Total Items: 1,076
USGS technician releases a male pintail as part of a study.
February 19, 2016

USGS WERC Scientist Releasing Tagged Male Pintail

A photo of USGS biological science technician releasing a male pintail in Suisun Marsh, CA. USGS Western Ecological Research Center scientists based out of Dixon, CA are marking and tagging waterfowl with GPS transmitters as part of an ongoing study.

Winter sunset at Lake Tahoe
February 2, 2016

Winter sunset at Lake Tahoe

Winter sunset at Lake Tahoe

Winter at Ward Creek, CA
February 2, 2016

Winter at Ward Creek, CA

Winter at Ward Creek, CA

Winter squall at Lake Tahoe
February 2, 2016

Winter squall at Lake Tahoe

Winter squall at Lake Tahoe

Long Valley Caldera Range Front Fault Diagram...
January 22, 2016

Long Valley Caldera range-front faults terminate at the caldera bou...

This is a simplified diagram of regional range front faults as they intersect the Long Valley Caldera. The Hartley Springs Fault and Hilton Creek Fault are range-front faults caused by regional Basin and Range extension (Earth's crust is pulling apart, and the Sierra Nevada mountains are lifting up and moving to the west as the Basin and Range drops down to the east).

...
Cars, pedestrians, and homes alongside a coast with big waves hitting the cliffs and sections of the cliff have collapsed.
January 8, 2016

Santa Cruz coastal erosion

The coastal bluff along East Cliff Drive in Santa Cruz, California are especially vulnerable to rising sea level during big storms. Sometimes even the rip-rap, put in place to protect roadways and homes, cannot protect the bluffs from erosion.

Photograph of Santa Cruz Beach Boardwalk and Main Beach in winter of 2016 when big storms hit the California coast.
January 7, 2016

Santa Cruz, California's Main Beach in winter

View of the Santa Cruz Beach Boardwalk amusement park in Santa Cruz, California. Photo was taken from the bluff on East Cliff Drive, east of the San Lorenzo River mouth. Sand on the beach gets eroded, redistributed, and deposited due to the dynamic conditions brought about by storms and changing river flow.

A buckle in the concrete lining of the Delta-Mendota canal.
December 31, 2015

Land Subsidence Along the Delta-Mendota Canal

Reduced surface-water availability (associated with droughts) during 1976-77, 1986-92, 2007-09, and 2012-current caused groundwater-pumping increases, water-level declines to near or beyond historic lows, and renewed aquifer compaction. The resulting land subsidence has canal buckling and reduced flow capacity of the Delta-Mendota Canal (pictured), the California Aqueduct

...
Two photos showing people standing near some kind of pole, collecting data up on top of a cliff overlooking the ocean.
December 31, 2015

GPS data collection along the Big Sur coast in 2007 (L), and 2015 (R)

Left: USGS research hydrologist Mark Reid (left) and USGS research geologist Kevin Schmidt collect GPS data along the Big Sur coast on September 19, 2007. Photo credit: Maiana Hanshaw, USGS (now with swisstopo).

Right: Kevin Schmidt collects GPS data near Harlan Rock on the Big Sur coast on March 19, 2015. Rain Rocks Rock Shed, near Pitkins Curve Bridge, can be seen

...
Geologic field-trip guide to Lassen Volcanic National Park and vici...
December 31, 2015

Geologic field-trip guide to Lassen Volcanic National Park

Geologic field-trip guide to Lassen Volcanic National Park and vicinity, California

A man navigates a personal watercraft with equipment mounted on it through choppy waves, he's looking over his left shoulder.
December 31, 2015

PWC bathymetric survey

Engineering technician Tim Elfers of the USGS Pacific Coastal and Marine Science Center navigates a personal watercraft (PWC) through waves offshore of central California. The PWC is equipped with sonar and GPS in order to map the nearshore seafloor.

Filter Total Items: 963
USGS science for a changing world logo
June 4, 2009

Residents should not be alarmed to witness a low-flying airplane over parts of southeastern California covering the western edge of the Mojave National Preserve and extending toward Barstow starting around June 6.

USGS science for a changing world logo
May 14, 2009

Open House at the USGS Science Center in Menlo Park, California.
"USGS enthusiastically opens its doors this weekend to show its Bay Area neighbors the great science that we do," said Anne Kinsinger, USGS Western Region Director "It's an honor to welcome the State Geologist as we celebrate the many important partnerships that add vitality to our science."

USGS science for a changing world logo
May 13, 2009

Entertainment and education await visitors of all ages at the U.S. Geological Survey's (USGS) Menlo Park Science Center Open House on Saturday, May 16 and Sunday, May 17. Along with taking in science, visitors can relax and listen to live bands performing old-time bluegrass, folk, rock, pop, jazz, Native American, spiritual, Celtic, and French.

USGS science for a changing world logo
May 8, 2009

Gold-Panning to Earthquake Simulations...Satellite Imagery to Microfossils...Science for the whole Family
Entertainment and education await visitors of all ages at the U.S. Geological Survey's (USGS) Menlo Park Science Center Open House on Saturday, May 16 and Sunday, May 17. The Open House will be from 10:00 a.m. until 4:00 p.m. both days, and admission is free of charge.

USGS science for a changing world logo
May 1, 2009

Residents should not be alarmed to witness a low-flying airplane over parts of the northern California Coast and Mendocino National Forest starting around May 8.

USGS science for a changing world logo
May 1, 2009

Five-million dollars in grants and cooperative agreements are being awarded in 2009 for earthquake research to 84 recipients including universities, state geological surveys and private firms, the U.S. Geological Survey (USGS) announced today. In addition, applications are being accepted for up to $7 million in grants and cooperative agreements for earthquake research in 2010.

USGS science for a changing world logo
April 16, 2009

USGS at Pacific Climate Workshop
New studies about the timing and geographic distribution of terrestrial, marine, and atmospheric climate connections will be the focus of the 24th Pacific Climate Workshop (PACLIM). The conference will be held April 19-22, 2009 at the Asilomar Conference Grounds, Pacific Grove, California.
 

USGS science for a changing world logo
March 18, 2009

The U.S. Geological Survey (USGS) will award up to $7 million in grants and cooperative agreements for earthquake research in 2010.
Interested researchers can apply online at GRANTS.GOV under the funding opportunity number 10HQPA0001. Applications are due May 13, 2009.

USGS science for a changing world logo
February 18, 2009

A new report from the U.S. Geological Survey (USGS) shows that the impacts of ground-water pumping and of changes in land and water use on streamflow in the Carson River upstream of Lahontan Dam were too small to be measured or were masked by variations in annual precipitation.

USGS science for a changing world logo
February 6, 2009

A U.S. Geological Survey (USGS) webcam is providing live views of water crashing down San Pedro Creek in Santa Barbara County – a watershed that is at high risk of flooding or debris flows as heavy rains arrive in Southern California.
Much of the watershed was severely burned in the Gap fire of July 2008. 
 

USGS science for a changing world logo
January 27, 2009

New hazard maps that describe the probability of earthquake-induced liquefaction in Northern Santa Clara Valley are now available from the U.S Geological Survey (USGS.)

USGS science for a changing world logo
January 26, 2009

Sea-level rise, severe winter storms, salmon populations, carbon sequestration, invasive plants, and migratory birds are among the many issues of concern to natural resource managers that are affected by changing climate. Climate change and its impact on coastal ecosystems is the focus of a 2-day workshop that will bring together more than 450 scientists and policy-makers.