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: 419
Date published: July 26, 2016
Status: Active

HDgov: Multi-agency Website for Human Dimensions of Natural Resources

HDgov is an interactive and mobile-responsive online portal to interagency, academic, and non-government resources focused on the human dimensions of natural resource management. The web portal provides easy access to tools, publications, data, and methods that help ensure that the people side of natural resources is considered throughout the entire natural resource management process. The...

Date published: July 26, 2016
Status: Active

National Park Service Visitor Spending Effects

The National Park Service (NPS) manages the Nation’s most iconic destinations that attract millions of visitors from across the Nation and around the world. Trip-related spending by NPS visitors generates and supports a considerable amount of economic activity within park gateway communities. USGS economists collaborate with the National Park Service social science program to estimate NPS...

Date published: July 21, 2016
Status: Active

Using Quantile Regression to Investigate Ecological Limiting Factors

Unexplained heterogeneity in statistical models of animal responses to their physical environment is reasonable to expect because the measured habitat resources are a constraint on—but not the sole determinant of—abundance, survival, fecundity, or fitness. The ecological understanding and reliability of management predictions based on animal habitat models can be improved by shifting focus ...

Date published: July 21, 2016
Status: Active

North American Waterfowl Management Plan

The ultimate success of North American Waterfowl Management Plan (NAWMP) depends on maintaining relevance to stakeholders and society. In order to be relevant, a first step is to better understand what people value in regard to waterfowl and their habitats. 

Date published: July 19, 2016
Status: Completed

Quantitative and Statistical Research Collaboration

Mathematical and statistical models are powerful research tools that play several important roles in conceptualizing and understanding the structure and dynamics of complicated ecological systems, including developing mechanistic hypotheses pertaining to ecological systems, designing studies that elucidate ecosystem structure and function, and extracting information from data.

Date published: June 27, 2016
Status: Active

Using Cell Technology to Track Species Movement

The Information Science Branch explored and developed ways to track species locations using a standard cellular phone network. This technology provides more tracking data at a faster rate and lower cost than traditional satellite tracking systems. The initial implementation of this approach currently provides support for the California Condor recovery program and is being extended to include...

Contacts: Gail Montgomery
Date published: April 13, 2016

Understanding Coastal Change

Scientists perform a range of studies that document, assess, and model coastal change, risk, and vulnerability. Studies include historical shoreline change, the geologic structure and history of coastal regions, sediment supply and transport, sea-level rise, and how extreme storm events affect rates and impacts of coastal change.

Date published: April 13, 2016

Geologic Hazards and Catastrophic Events

We study the distribution and hazard potential of coastal and submarine events such as earthquakes and submarine landslides and associated tsunami potential, hurricane induced coastal inundation, extreme storms, sea-level rise and oil and gas spills. We also model development to help evaluate and forecast coastal hazard probability and occurrence.

Date published: April 13, 2016

Ocean Resources for America's Needs

Our scientists conduct research studies focused on geologic mapping, sampling and understanding of mineral and energy resources and studies of the geologic setting and processes to inform renewable energy development offshore.

Date published: April 12, 2016
Status: Active

USGS Library

The USGS Library, managed by CSAS&L, supports all fundamental scientific research conducted within USGS. It serves both internal and external customers with comprehensive access to literature, data, and information necessary understand USGS mission areas and make critical decisions about how to proceed with research initiatives and investigations in the earth and natural sciences.

Date published: March 17, 2016

Volcano Hazards Assessments Help Mitigate Disasters

The Volcano Hazards Program develops long-range volcano hazards assessments. These includes a summary of the specific hazards, their impact areas, and a map showing ground-hazard zones. The assessments are also critical for planning long-term land-use and effective emergency-response measures, especially when a volcano begins to show signs of unrest.

Date published: March 9, 2016
Status: Active

California Water Science Center

The Center's mission is to collect and analyze hydrologic data needed to manage water resources for the State of California. The CAWSC operates local and statewide networks to collect high-quality data that define natural and human hydrologic changes; analyzes hydrologic processes; maintains data bases; and publishes peer-reviewed reports to create unbiased hydrologic information.

Attribution:
Filter Total Items: 580
Date published: December 26, 2017

Hydrodynamic and sediment transport data from San Pablo Bay and China Camp marsh (northern San Francisco Bay), 2013-2016

The USGS Pacific Coastal and Marine Science Center collected data to investigate sediment dynamics in the shallows of San Pablo Bay (SP) and sediment exchange between bay shallows and the tidal salt marsh in China Camp State Park (CMC) in a series of deployments between December 2013 and June 2016. This data release includes two related groups of data sets, one for SP and one for CMC.

Date published: December 12, 2017

River-channel topography, grain size, and turbidity records from the Carmel River, California, before, during, and after removal of San Clemente Dam

The San Clemente Dam, built in the 1920s on the Carmel River in Monterey County, California, was removed during 2014 and 2015. The dam-removal project was the largest in California to date, and one of the largest in the U.S. The USGS collected data before, during, and after the removal of the dam to study how the river channel's topographic profiles and sediment distributions changed...

Date published: November 16, 2017

Multibeam bathymetry and acoustic-backscatter data collected in 2016 in Catalina Basin, southern California and merged multibeam bathymetry datasets of the northern portion of the Southern California Continental Borderland

In February 2016 the University of Washington in cooperation with USGS PCMSC collected multibeam bathymetry and acoustic-backscatter data in and near the Catalina Basin, southern California aboard the University of Washington's Research Vessel Thomas G. Thompson. Data was collected using a hull-mounted Kongsberg EM300 multibeam...

Date published: October 30, 2017

Hydrogen stable isotope data for: 'Mechanisms associated with an advance in the timing of seasonal reproduction in an urban songbird'

This dataset includes stable hydrogen isotope values of the nonexchangeable hydrogen contained in the outer most secondary feathers of dark-eyed juncos (Junco hyemalis thurberi) collected from the University of California San Diego campus in La Jolla, California in 2014.

Date published: September 20, 2017

Near-surface wind fields for San Francisco Bay--historical and 21st-century projected time series

To support CoSMoS in the San Francisco Bay, time series of historical and 21st-century near-surface wind fields (eastward and northward wind arrays) were simulated throughout the Bay. While global climate models provide useful projections of near-surface wind vectors into the 21st century, resolution is not sufficient enough for use in regional wave modeling projects, such as CoSMoS. Short-...

Date published: September 1, 2017

National Water Information System web interface (NWISweb)

The National Water Information System (NWIS) web application provides access to real-time and historical surface-water, groundwater, water-quality, and water-use data collected at approximately 1.5 million sites across all 50 states.

Date published: August 30, 2017

California spotted owl fledgling counts, climate, and landscape habitat at territories on the Lassen National Forest, CA 1991-2010

This is a comma separated values (CSV) file used to conduct the logistic quantile regression analyses in R provided by Cade et al. (2017). The data set consists of records of California spotted owl fledgling counts on 88 territories on the Lassen National Forest, CA from 1991-2010. Climatic condition data were obtained from PRISM and landscape habitat data were obtained from LANDFIRE.

Date published: August 24, 2017

Coastal Change Hazards Portal

Interactive access to coastal change science and data for our Nation’s coasts. Information and products are organized within three coastal change hazard themes: 1) extreme storms, 2) shoreline change, and 3) sea-level rise. Displays probabilities of coastal erosion.

Date published: August 4, 2017

San Diego Hydrogeology Data Map

Map of the San Diego Hydrogeology project study area with links to groundwater and surface water data for each of the monitoring sties. 

Date published: July 17, 2017

Multichannel sparker and minisparker seismic-reflection data of USGS field activity 2014-645-FA collected in the outer Santa Barbara Channel, California, between 2014-11-12 to 2014-11-25 (ver. 2.0, March 2020)

This data release contains 35 multichannel sparker and 24 multichannel minisparker seismic reflection (MCS) profiles that were collected in November of 2014 from the Catalina and Santa Cruz Basins offshore southern California by the U.S. Geological Survey Pacific and Coastal Marine Science Center. Data were collected aboard the University of California’s R/V Robert Gordon Sproul on

Date published: July 17, 2017

Chirp seismic-reflection data of USGS field activity 2014-645-FA collected in the outer Santa Barbara Channel, California, between 2014-11-12 to 2014-11-25 (ver. 2.0, March 2020)

This data release contains 43 chirp sub-bottom profiles that were collected in November of 2014 from the Catalina and Santa Cruz Basins offshore southern California by the U.S. Geological Survey Pacific and Coastal Marine Science Center. Data were collected aboard the University of California’s R/V Robert Gordon Sproul on USGS cruise 2014-645-FA. Chirp profiles were collected to assess

Date published: June 7, 2017

Bathymetry and acoustic backscatter data of the Sacramento River, from the Feather River to Knights Landing, California in February, 2011

On February 1, 2011, the USGS Pacific Coastal and Marine Science Center team carried out a project using interferometric sidescan sonar to characterize the riverbed and channel banks of a 12 mile reach of the Sacramento River near the town of Knights Landing, California (River Mile 79 through River Mile 91). The project was developed in coordination with the US Army Corps of Engineers as part...

Filter Total Items: 470
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Year Published: 2005

Landslide hazards at La Conchita, California

Jibson, Randall W.
Landslide hazards at La Conchita, California; 2005; OFR; 2005-1067; Jibson, Randall W.

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Year Published: 2005

Elevated mercury concentrations in failed eggs of Snowy Plovers at Point Reyes National Seashore

[No abstract available]

Schwarzbach, S.E.; Stephenson, M.; Ruhlen, T.; Abbott, S.; Page, G. W.; Adams, D.
Elevated mercury concentrations in failed eggs of Snowy Plovers at Point Reyes National Seashore; 2005; Article; Journal; Marine Pollution Bulletin; Schwarzbach, S. E.; Stephenson, M.; Ruhlen, T.; Abbott, S.; Page, G. W.; Adams, D.

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Year Published: 2005

Estimation of regional material yield from coastal landslides based on historical digital terrain modelling

High-resolution historical (1942) and recent (1994) digital terrain models were derived from aerial photographs along the Big Sur coastline in central California to measure the long-term volume of material that enters the nearshore environment. During the 52-year measurement time period, an average of 21 000 ?? 3100 m3 km-1 a-1 of material was...

Hapke, C.J.
Estimation of regional material yield from coastal landslides based on historical digital terrain modelling; 2005; Article; Journal; Earth Surface Processes and Landforms; Hapke, C. J.

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Year Published: 2005

Habitat restoration as a means of controlling non-native fish in a Mojave desert Oasis

Non-native fish generally cause native fish decline, and once non-natives are established, control or elimination is usually problematic. Because non-native fish colonization has been greatest in anthropogenically altered habitats, restoring habitat similar to predisturbance conditions may offer a viable means of non-native fish control. In this...

Scoppettone, G.G.; Rissler, P.H.; Gourley, C.; Martinez, C.
Habitat restoration as a means of controlling non-native fish in a Mojave desert Oasis; 2005; Article; Journal; Restoration Ecology; Scoppettone, G. G.; Rissler, P. H.; Gourley, C.; Martinez, C.

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Year Published: 2005

Relation of desert pupfish abundance to selected environmental variables in natural and manmade habitats in the Salton Sea basin

We assessed the relation between abundance of desert pupfish, Cyprinodon macularius, and selected biological and physicochemical variables in natural and manmade habitats within the Salton Sea Basin. Field sampling in a natural tributary, Salt Creek, and three agricultural drains captured eight species including pupfish (1.1% of the total catch),...

Martin, B.A.; Saiki, M. K.
Relation of desert pupfish abundance to selected environmental variables in natural and manmade habitats in the Salton Sea basin; 2005; Article; Journal; Environmental Biology of Fishes; Martin, B. A.; Saiki, M. K.

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Year Published: 2005

The composition of coexisting jarosite-group minerals and water from the Richmond mine, Iron Mountain, California

Jarosite-group minerals accumulate in the form of stalactites and fine-grained mud on massive pyrite in the D drift of the Richmond mine, Iron Mountain, California. Water samples were collected by placing beakers under the dripping stalactites and by extracting pore water from the mud using a centrifuge. The water is rich in Fe3+ and SO4...

Jamieson, Heather E.; Robinson, Clare; Alpers, Charles N.; Nordstrom, D. Kirk; Poustovetov, Alexei; Lowers, Heather A.
The composition of coexisting jarosite-group minerals and water from the Richmond mine, Iron Mountain, California; 2005; Article; Journal; Canadian Mineralogist; Jamieson, H. E.; Robinson, C.; Alpers, C. N.; Nordstrom, D. K.; Poustovetov, A.; Lowers, H. A.

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Year Published: 2005

Total mercury concentrations in fillets of bluegill, redear sunfish, largemouth bass, and other fishes from Lake Natoma, Sacramento County, California

This study was conducted during September-October 2002 to verify preliminary findings of elevated total mercury concentrations in skinless fillets of sportfishes inhabiting Lake Natoma. Although we measured total mercury concentrations, most mercury in fish flesh occurs in the methylated form. In August 2000, other investigators collected a small...

Saiki, M. K.; Martin, B.A.; May, T.W.; Alpers, Charles N.
Total mercury concentrations in fillets of bluegill, redear sunfish, largemouth bass, and other fishes from Lake Natoma, Sacramento County, California; 2005; Article; Journal; California Fish and Game; Saiki, M. K.; Martin, B. A.; May, T. W.; Alpers, C. N.

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Year Published: 2004

Science support for salt pond restoration and management in south San Francisco Bay

Swanson, Kathleen M.; Shellenbarger, Gregory; Henderson, Kathleen D.; DiLeo, Jeanne S.; Schoellhamer, David H.
Science support for salt pond restoration and management in south San Francisco Bay; 2004; FS; 2004-3135; Swanson, Kathleen M.; Shellenbarger, Gregory G.; Henderson, Kathleen D.; DiLeo, Jeanne S.; Schoellhamer, David H.

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Year Published: 2004

Chapter E. The Loma Prieta, California, Earthquake of October 17, 1989 - Geologic setting and crustal structure

Although some scientists considered the Ms=7.1 Loma Prieta, Calif., earthquake of 1989 to be an anticipated event, some aspects of the earthquake were surprising. It occurred 17 km beneath the Santa Cruz Mountains along a left-stepping restraining bend in the San Andreas fault system. Rupture on the southwest-dipping fault plane consisted of...

Wells, Ray E.
Chapter E. The Loma Prieta, California, Earthquake of October 17, 1989 - Geologic Setting and Crustal Structure; 2004; PP; 1550-E; The Loma Prieta, California, Earthquake of October 17, 1989: Earthquake Occurrence; Edited by Wells, Ray E.

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Year Published: 2004

Map showing coastal cliff retreat rates along the Big Sur coast, Monterey and San Luis Obispo Counties, California

The average coastal cliff retreat rate along the Big Sur coast is 18 ? 6 cm/yr as measured over a 52-year time period. The erosion reference features measured as the cliff edge include the well-defined cliff edges common to marine terraces, slight breaks in the slope defining the upper edge of the active lower slope, and the road grade. Cliff...

Hapke, Cheryl J.; Green, Krystal R.
Map showing coastal cliff retreat rates along the Big Sur coast, Monterey and San Luis Obispo Counties, California; 2004; SIM; 2853; Hapke, Cheryl J.; Green Krystal R.

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Year Published: 2004

Maps showing estimated sediment yield from coastal landslides and active slope distribution along the Big Sur coast, Monterey and San Luis Obispo Counties, California

The 1982-83 and 1997-98 El Ni?os brought very high precipitation to California?s central coast; this precipitation resulted in raised groundwater levels, coastal flooding, and destabilized slopes throughout the region. Large landslides in the coastal mountains of Big Sur in Monterey and San Luis Obispo Counties blocked sections of California State...

Hapke, Cheryl J.; Green, Krystal R.; Dallas, Kate
Maps showing estimated sediment yield from coastal landslides and active slope distribution along the Big Sur coast, Monterey and San Luis Obispo Counties, California; 2004; SIM; 2852; Hapke, Cheryl J.; Green, Krystal R.; Dallas, Kate

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Year Published: 2004

Preliminary report on using imaging spectroscopy to map ultramafic rocks, serpentinites, and tremolite-actinolite-bearing rocks in California

Airborne Visible/InfraRed Imaging Spectrometer (AVIRIS) data were collected in approximately 3- kilometer-wide swaths over selected areas in El Dorado and Plumas Counties that contain serpentinite and ultramafic rocks as part of an experiment to determine if potentially asbestos-bearing rocks could be identified spectrally. M ineral maps created...

Swayze, Gregg A.; Higgins, Chris T.; Clinkenbeard, John P.; Kokaly, Raymond F.; Clark, Roger N.; Meeker, Gregory P.; Sutley, Stephen J.
Preliminary report on using imaging spectroscopy to map ultramafic rocks, serpentinites, and tremolite-actinolite-bearing rocks in California; 2004; OFR; 2004-1304; Swayze, Gregg A.; Higgins, Chris T.; Clinkenbeard, John P.; Kokaly, Raymond F.; Clark, Roger N.; Meeker, Gregory P.; Sutley, Stephen J.

Filter Total Items: 1,107
Satellite showing the burn scars from the Thomas fire in California
December 25, 2017

Southern California Wildfires Update

In the Landsat 8 image acquired on December 9, smoke is carried west by strong winds, which also continued to spread fire through the dry terrain, mountain passes, and canyons. The diagonal lines are an airplane contrail and its shadow cast on the ground. Landsat 8’s December 25 image reveals the burn scar and shows

...
December 15, 2017

Image of the Week - Southern California Wildfires, December 2017

The Thomas fire has burned more than 230,000 acres and continues to blaze across souther California. These images show some of the burn scar left behind.

At the USGS EROS Center, we study land change, operate the Landsat satellites, and maintain the longest, continuously acquired collection of images of the Earth's land surface.

USGS EROS Center (

A woman facing the camera talks to two men with their backs to the camera.
December 9, 2017

USGS Open House discussions

Members of the PCMSC Marine Minerals Team, including physical science technician Kira Mizell (center), took turns describing the importance of seafloor minerals.

A man at right talks about and gestures at a rock on a table to another man who is squatting in front of the rock.
December 9, 2017

Talking about seafloor mineral deposits

Research geologist Jim Hein (right) gave a hands-on explanation of seafloor mineral deposits.

A woman shows visitors how she uses sediment sieves.
December 9, 2017

Sifting sand with sieves

During a USGS Open House in Santa Cruz, California, research geologist Amy East shows onlookers how to sift sand to determine its size.

A man and two women crouch around a table with a computer screen that one of the women is pointing to while she talks.
December 9, 2017

Sharing information on the screen

Visitors watched closely as Alicia Balster-Gee (in green vest) presented our research on marine geohazards in Alaska.

person bent over on barren ground over looking a lake and mountains. A jute net covers the foreground.
December 8, 2017

Scientist spreading moss fragments

A USGS scientist spreads moss fragments for a study to test the restoration potential of moss, an important component of biological soil crust. A jute net, foreground, helps stabilize the moss fragments as they adhere to the soil.

Coastal view of landslide area with sand, gravel, cobbles, and large rocks of all sizes on a slope.
December 7, 2017

Upper terrace of Mud Creek slide

Mud Creek slide from south side of north upper terrace (above north and south berms). Note tension cracks and offset on the terrace to the north.

November 30, 2017

2017 Nov. Pub. Lecture—Sea Otters: Confessions of a Keystone Carnivore

  • Sea otters are perhaps the best-known example of a "keystone predator".
  • Sea otter behavior -- in particular diet specialization and limited mobility -- can mediate their effects on ecosystem dynamics.
  • Other predators, especially large sea stars, can complement and reinforce the keystone role of sea otters: this became apparent with the loss of all
Attribution: Ecosystems
View of a beach from up high on a roof with a pier, gentle waves, and an amusement park far off in the distance.
November 7, 2017

Santa Cruz Main Beach

Still-image from video camera atop the Dream Inn looks eastward over Main Beach and boardwalk in Santa Cruz, CA.

A series of images from various sources of shaded-relief topography show the progression of the Mud Creek landslide area.
November 6, 2017

Mud Creek Shaded-Relief Topography, 2010-2017

A series of images from various sources of shaded-relief topography show the progression of the Mud Creek landslide area, from 2010 through October 12, 2017.

Sources:

  1. lidar data from 2010
  2. lidar data from 2016
  3. structure-from-motion (SfM), March 8, 2017
  4. SfM, May 19, 2017
  5. SfM, May 27, 2017
  6. SfM, May 31, 2017
...
October 26, 2017

2017 Oct. Public Lecture — Global Trends in Mineral Commodity Supplies

  • The U.S. is increasingly reliant on supply of mineral raw materials from other countries.
  • Advanced technologies are increasingly making use of nearly the entire periodic table of the elements.
  • Dynamic studies of critical and strategic mineral supply and demand can identify emerging potential supply risks.
  • The USGS - National Minerals
Filter Total Items: 984
Magnitude 3.8 earthquake (large purple dot) located about 18 km SE ...
October 21, 2013

A magnitude 3.8 earthquake occurred on October 21, 2013 at 10:04 PDT 18 km (11 miles) SE of the town of Mammoth Lakes in eastern California.

USGS
September 26, 2013

Nitrate was detected at high concentrations in 10 percent of the aquifer system used for public supply in coastal areas of Santa Barbara and San Luis Obispo counties, according to a new U.S. Geological Survey report.

USGS
September 12, 2013

California’s Sea Otter Numbers Continue Slow Climb

Tsunami Messaging Image
September 5, 2013

The fearsome aftermath of a tsunami striking California might cost at least $3.4 billion to repair, but neither of the state's nuclear power plants would be damaged, suggests a new analysis that could help officials and the public prepare for a tsunami and reduce risks before any such disasters happen.

USGS
September 4, 2013

While scientists can't predict when a great earthquake producing a pan-Pacific tsunami will occur, thanks to new tools being developed by federal and state officials, scientists can now offer more accurate insight into the likely impacts when tsunamis occur. This knowledge can lead officials and the public to reduce the risk of the future tsunamis that will impact California.

USGS
August 20, 2013

A new interagency report provides a plan for long-term scientific monitoring and assessment for California's Salton Sea. Monitoring of the Salton Sea ecosystem is critical for informed decision making and the success of restoration efforts. 

USGS
August 13, 2013

When California State University, East Bay demolishes its seismically unsafe Warren Hall on Aug. 17 on its Hayward campus, the landmark building's implosion will produce energy similar to a small earthquake that can be used to study and map the nearby Hayward Fault. 

USGS
August 9, 2013

Science and technology have peeled back a veil of water just offshore of California, revealing the hidden seafloor in unprecedented detail. New imagery, specialized undersea maps, and a wealth of data from along the California coast are now available.

USGS
July 26, 2013

A study on frogs in remote Sierra Nevada mountain habitats including Yosemite National Park and Giant Sequoia National Monument, detected concentrations of pesticides in frog tissue that potentially came from California's Central Valley sources. 

USGS
July 11, 2013

Initial findings will support a USGS hydrologic model to better understand area water-supply issues
 

Carbon dioxide gas detection instrument installed at Horseshoe Lake...
July 2, 2013

Since 1990, high levels of carbon dioxide (CO2) in the soil have killed trees within about a 75-acre area adjacent to Horseshoe Lake on the south side of Mammoth Mountain.

USGS
June 27, 2013

When it comes to weekend activities, many people make the tough choice between recreation and spending their time volunteering.  But recently, The Nature Conservancy and the U.S. Geological Survey (USGS) gave a group of local anglers a chance to do both at once.