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: 583
Date published: January 1, 2017

Geology and geomorphology--Offshore of Gaviota Map Area, California

This part of DS 781 presents data for the geologic and geomorphic map of the Offshore of Gaviota map area, California. The vector data file is included in "Geology_OffshoreGaviota.zip," which is accessible from https://doi.org/10.5066/F7TH8JWJ. These data accompany the pamphlet and map sheets of Johnson, S.Y., Dartnell, P., Cochrane, G.R.,...

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 flood-hazard depth and duration projections: average conditions in Ventura County

Maximum depth of flooding surface (in cm) in the region landward of the present day shoreline that is inundated for the storm condition and sea-level rise (SLR) scenario indicated. Note: Duration datasets may have occasional gaps in open-coast sections.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of k

Date published: January 1, 2017

Folds--Offshore of Point Conception Map Area, California

This part of DS 781 presents fold data for the geologic and geomorphic map of the Offshore of Point Conception Map Area, California. The vector data file is included in "Folds_OffshorePointConception.zip," which is accessible from https://doi.org/10.5066/F7QN64XQ. These data accompany the pamphlet and map sheets of Johnson, S.Y., Dartnell, P.,...

Date published: January 1, 2017

Water pressure/depth and turbidity time-series data from CHC16 Marsh and mudflat stations in San Pablo Bay and China Camp Marsh, California

Files contain hydrodynamic and sediment transport data for the location and deployment indicated. Time-series data of water depth, velocity, turbidity, and temperature were collected in San Pablo Bay and China Camp Marsh as part of the San Francisco Bay Marsh Sediment Experiments. Several instruments were deployed in tidal creek, marsh, mudflat, and Bay locations, gathering data on

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 wave-hazard projections: 100-year storm in Orange County

Model-derived significant wave height (in meters) for the given storm condition and sea-level rise (SLR) scenario.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenarios. CoSMoS v3.0 for So

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 flood-hazard depth and duration projections: 100-year storm in Los Angeles County

Projected Hazard: Maximum depth of flooding surface (in cm) in the region landward of the present day shoreline that is inundated for the storm condition and sea-level rise (SLR) scenario indicated. Note: Duration datasets may have occasional gaps in open-coast sections.
Model Summary: The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) o

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 wave-hazard projections: average conditions in Ventura County

Model-derived significant wave height (in meters) for the given storm condition and sea-level rise (SLR) scenario.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenarios. CoSMoS v3.0 for So

Date published: January 1, 2017

Seasonal vegetation characteristics in a Spartina foliosa- and Salicornia pacifica-dominated salt marsh at China Camp State Park

As part of the San Francisco Bay Marsh Sediment Experiments and hydrodynamic investigations in San Pablo Bay and China Camp Marsh, California, vegetation sampling measurements were taken over several periods at numerous locations. This portion of the data release presents physical characteristics and percent cover data from vegetation plots sampled in China Camp State Park salt marsh (north...

Date published: January 1, 2017

Reprocessed boomer 3D seismic-reflection data of field activity P-04-11-CC, in San Luis Obispo Bay, offshore of Pismo Beach, central California, 2011-12-06 to 2012-10-05

This dataset includes reprocessed boomer 3D seismic data collected by the Fugro Consultants Inc. in 2012, in San Luis Obispo Bay, offshore of Pismo Beach, central California.

Date published: January 1, 2017

Faults--Offshore of Gaviota Map Area, California

This part of DS 781 presents fault data for the geologic and geomorphic map of the Offshore of Gaviota map area, California. The vector data file is included in "Faults_OffshoreGaviota.zip," which is accessible from https://doi.org/10.5066/F7TH8JWJ. These data accompany the pamphlet and map sheets of Johnson, S.Y., Dartnell, P., Cochrane, G.R.,...

Date published: January 1, 2017

Water pressure/depth, velocity, and turbidity time-series data from CHC13 Bay shallows stations in San Pablo Bay and China Camp Marsh, California

Files contain hydrodynamic and sediment transport data for the location and deployment indicated. Time-series data of water depth, velocity, turbidity, and temperature were collected in San Pablo Bay and China Camp Marsh as part of the San Francisco Bay Marsh Sediment Experiments. Several instruments were deployed in tidal creek, marsh, mudflat, and Bay locations, gathering data on

Date published: January 1, 2017

Bathymetry hillshade--Offshore of Point Conception Map Area, California

This part of DS 781 presents data for bathymetry for several seafloor maps of the Offshore of Point Conception Map Area, California. The vector data file is included in "Bathymetry_OffshorePointConception.zip," which is accessible from https://doi.org/10.5066/F7QN64XQ. These data accompany the pamphlet and map sheets of Johnson, S.Y., Dartnell, P...

Filter Total Items: 481
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Year Published: 1996

Riparian vegetation and its water use during 1995 along the Mojave River, Southern California

The extent and areal density of riparian vegetation, including both phreatophytes and hydrophytes, were mapped along the 100-mile main stem of the Mojave River during 1995. Mapping was aided by vertical false-color infrared and low-level oblique photographs. However, positive identification of plant species and plant physiological stress required...

Lines, Gregory C.; Bilhorn, Thomas W.
Riparian vegetation and its water use during 1995 along the Mojave River, Southern California; 1996; WRI; 96-4241; Lines, Gregory C.; Bilhorn, Thomas W.

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Year Published: 1996

Recent introduction of the foraminifer Trochammina hadai Uchio into San Francisco Bay, California, USA

[No abstract available]

McGann, M.; Sloan, D.
Recent introduction of the foraminifer Trochammina hadai Uchio into San Francisco Bay, California, USA; 1996; Article; Journal; Marine Micropaleontology; McGann, M.; Sloan, D.

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Year Published: 1995

Water-resources data network evaluation for Monterey County, California; Phase 2, northern and coastal areas of Monterey County

This report presents an evaluation of water- resources data-collection networks in the northern and coastal areas of Monterey County, California. This evaluation was done by the U.S. Geological Survey in cooperation with the Monterey County Flood Control and Water Conservation District to evaluate precipitation, surface water, and ground water...

Templin, W.E.; Smith, P.E.; DeBortoli, M.L.; Schluter, R.C.
Water-resources data network evaluation for Monterey County, California; Phase 2, northern and coastal areas of Monterey County; 1995; WRI; 95-4210; Templin, W. E.; Smith, P. E.; DeBortoli, M. L.; Schluter, R. C.

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Year Published: 1995

Land use and water use in the Antelope Valley, California

Urban land use and water use in the Antelope Valley, California, have increased significantly since development of the valley began in the late 1800's.. Ground water has been a major source of water in this area because of limited local surface-water resources. Ground-water pumpage is reported to have increased from about 29,000 acre-feet in 1919...

Templin, William E.; Phillips, Steven P.; Cherry, Daniel E.; DeBortoli, Myrna L.; Haltom, T.C.; McPherson, Kelly R.; Mrozek, C.A.
Land use and water use in the Antelope Valley, California; 1995; WRI; 94-4208; Templin, W. E.; Phillips, S. P.; Cherry, D. E.; DeBortoli, M. L.; Haltom, T. C.; McPherson, K. R.; Mrozek, C. A.

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Year Published: 1995

Look before you build; geologic studies for safer land development in the San Francisco Bay area

This Circular provides a general description of the types of geologic hazards that exist throughout the United States. In nontechnical language this book describes how geologic information can be incorporated in the land-use development process and contains useful discussion of several examples from the San Francisco Bay area and elsewhere in the...

Blair-Tyler, Martha
Look before you build; geologic studies for safer land development in the San Francisco Bay area; 1995; CIR; 1130; Blair-Tyler, Martha

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Year Published: 1994

Accounting for Consumptive Use of Lower Colorado River Water in Arizona, California, Nevada, and Utah

In the Colorado River valley between the east end of Lake Mead and the international boundary with Mexico (see figure), the river is the principal source of water for agricultural, domestic, municipal, industrial, hydroelectric-power generation, and recreational purposes. Water is stored in surface reservoirs and in the river aquifer---permeable...

Owen-Joyce, Sandra J.; Wilson, Richard P.
Accounting for Consumptive Use of Lower Colorado River Water in Arizona, California, Nevada, and Utah; 1994; FS; 074-94; Owen-Joyce, Sandra J.; Wilson, Richard P.

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Year Published: 1994

Chapter A. The Loma Prieta, California, Earthquake of October 17, 1989 - Loss estimation and procedures

This Professional Paper includes a collection of papers on subjects ranging from evaluation of building safety, to human injuries, to correlation of ground deformation with building damage. What these papers share is a common goal to improve the tools available to the research community to measure the nature, extent, and causes of damage and...

Tubbesing, Susan K.
Chapter A. The Loma Prieta, California, Earthquake of October 17, 1989 - Loss Estimation and Procedures; 1994; PP; 1553-A; The Loma Prieta, California, Earthquake of October 17, 1989: Societal Response; Edited by Tubbesing, Susan K.

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Year Published: 1994

Chapter A. The Loma Prieta, California, Earthquake of October 17, 1989 - Strong ground motion

Strong ground motion generated by the Loma Prieta, Calif., earthquake (MS~7.1) of October 17, 1989, resulted in at least 63 deaths, more than 3,757 injuries, and damage estimated to exceed $5.9 billion. Strong ground motion severely damaged critical lifelines (freeway overpasses, bridges, and pipelines), caused severe damage to poorly constructed...

Borcherdt, Roger D.
Chapter A. The Loma Prieta, California, Earthquake of October 17, 1989 - Strong Ground Motion; 1994; PP; 1551-A; The Loma Prieta, California, Earthquake of October 17, 1989: Strong Ground Motion and Ground Failure; Edited by Borcherdt, Roger D.

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Year Published: 1994

Chapter C. The Loma Prieta, California, Earthquake of October 17, 1989 - Fire, police, transportation and hazardous materials

The papers in this chapter discuss some of the failures and successes that resulted from the societal response by a multitude of agencies to the Loma Prieta earthquake. Some of the lessons learned were old ones relearned. Other lessons were obvious ones which had gone unnoticed. Still, knowledge gained from past earthquakes spawned planning and...

Van Anne, Craig; Scawthorn, Charles R.
Chapter C. The Loma Prieta, California, Earthquake of October 17, 1989 - Fire, Police, Transportation and Hazardous Materials; 1994; PP; 1553-C; The Loma Prieta, California, Earthquake of October 17, 1989: Societal Response; Edited by Van Anne, Craig; Scawthorn, Charles R.

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Year Published: 1994

Chapter E. The Loma Prieta, California, Earthquake of October 17, 1989 - Hydrologic disturbances

Seismic events have long been known to cause changes in the level of oceans, streams, lakes, and the water table. The great San Francisco earthquake of 1906 induced significant hydrologic changes that were qualitatively similar to those changes observed for the Loma Prieta earthquake. What is different is that the hydrologic data sets collected...

Rojstaczer, Stuart A.
Chapter E. The Loma Prieta, California, Earthquake of October 17, 1989 - Hydrologic Disturbances; 1994; PP; 1551-E; The Loma Prieta, California, Earthquake of October 17, 1989: Strong Ground Motion and Ground Failure; Edited by Rojstaczer, Stuart A.

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Year Published: 1994

Chapter F. The Loma Prieta, California, Earthquake of October 17, 1989 - Tectonic processes and models

If there is a single theme that unifies the diverse papers in this chapter, it is the attempt to understand the role of the Loma Prieta earthquake in the context of the earthquake 'machine' in northern California: as the latest event in a long history of shocks in the San Francisco Bay region, as an incremental contributor to the regional...

Simpson, Robert W.
Chapter F. The Loma Prieta, California, Earthquake of October 17, 1989 - Tectonic Processes and Models; 1994; PP; 1550-F; The Loma Prieta, California, Earthquake of October 17, 1989: Earthquake Occurrence; Edited by Simpson, Robert W.

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Year Published: 1994

Irrigation water supply and demand data for 1976, 1980, and 1984 for the western San Joaquin Valley, California

This report presents the irrigation water supply and demand data for 1976, 1980, and 1984 for 32 water districts in the western San Joaquin Valley, California. Data are provided for each water district or each of the three years if the data were available. The complete data base is given by water district or each township, range, and section in...

Templin, W.E.; Haltom, T.C.
Irrigation water supply and demand data for 1976, 1980, and 1984 for the western San Joaquin Valley, California; 1994; OFR; 94-335; Templin, W. E.; Haltom, T. C.

Filter Total Items: 1,116
USGS Scientist sampling soil gasses from a grassy hilltop on Santa Rosa Island, CA, with fog draping coast in background.
July 6, 2017

Sampling soil carbon dioxide on Santa Rosa Island

USGS Scientist sampling soil gasses from a grassy hilltop soil on Santa Rosa Island, Channel Islands National Park, California. The composition of soil gasses is indicative of the number and variety of microorganisms in the soil and what type of material they are digesting. Santa Rosa Island was heavily impacted by grazing animals and learning about soil microorganisms

...
A series of images shows the height of a landslide and how it erodes over time.
June 28, 2017

Mud Creek landslide shoreface erosion

In 2017, the massive Mud Creek landslide buried a quarter-mile of the famous coastal route, California’s Highway 1, with rocks and dirt more than 65 feet deep. USGS monitors erosion along the landslide-prone cliffs of Big Sur, collecting aerial photos frequently throughout the year. By analyzing overlapping photos, they made precise maps of the slopes and calculated

...
Profiles of the front edge of a landslide at water's edge along a cliff.
June 28, 2017

3D Point Cloud Profiles at Landslide Toe

In 2017, the massive Mud Creek landslide buried a quarter-mile of the famous coastal route, California’s Highway 1, with rocks and dirt more than 65 feet deep. USGS monitors erosion along the landslide-prone cliffs of Big Sur, collecting aerial photos frequently throughout the year. By analyzing overlapping photos, they made precise maps of the slopes and calculated

...
June 22, 2017

PubTalk 6/2017 — Effects of Climate Change: A Scientific Path Forward

Title: The Effects of Climate Change: A Scientific Pathway Forward

  • The frequency of extreme and unpredictable weather events is increasing.
  • What are the effects of an increase or decrease in carbon emissions?
  • What is scientific research projecting for the future of climate change?
A series of images showing a steep cliff along the coast from two different dates and the change between them.
June 14, 2017

Mud Creek 2017 May 27-June 13 Erosion View 2

In 2017, the massive Mud Creek landslide buried a quarter-mile of the famous coastal route, California’s Highway 1, with rocks and dirt more than 65 feet deep. USGS monitors erosion along the landslide-prone cliffs of Big Sur, collecting aerial photos frequently throughout the year. By analyzing overlapping photos, they made precise maps of the slopes and calculated

...
A series of images showing a steep cliff along the coast from two different dates and the change between them.
June 14, 2017

Mud Creek 2017 May 27-June 13 Erosion View 3

In 2017, the massive Mud Creek landslide buried a quarter-mile of the famous coastal route, California’s Highway 1, with rocks and dirt more than 65 feet deep. USGS monitors erosion along the landslide-prone cliffs of Big Sur, collecting aerial photos frequently throughout the year. By analyzing overlapping photos, they made precise maps of the slopes and calculated

...
A series of images show the height of the ground and how it changes over 17 days.
June 14, 2017

Mud Creek landslide "pyramid rock" profile and shoreface erosion

In 2017, the massive Mud Creek landslide buried a quarter-mile of the famous coastal route, California’s Highway 1, with rocks and dirt more than 65 feet deep. USGS monitors erosion along the landslide-prone cliffs of Big Sur, collecting aerial photos frequently throughout the year. By analyzing overlapping photos, they made precise maps of the slopes and calculated

...
A series of images showing a steep cliff along the coast from two different dates and the change between them.
June 14, 2017

Mud Creek 2017 May 27-June 13 Erosion View 1

In 2017, the massive Mud Creek landslide buried a quarter-mile of the famous coastal route, California’s Highway 1, with rocks and dirt more than 65 feet deep. USGS monitors erosion along the landslide-prone cliffs of Big Sur, collecting aerial photos frequently throughout the year. By analyzing overlapping photos, they made precise maps of the slopes and calculated

...
Illustration shows how photos over a landslide are used to create a digital model for comparison over time.
May 31, 2017

Measuring topographic change with 4D photogrammetry

Provisional data subject to revision. From the USGS Remote Sensing Coastal Change Project, illustration describes how the USGS measures topographic change with 4D photogrammetry utilizing the techniques of Warrick et al., 2017. A digital terrain model of a coastal cliff is shown with its ground control points. The figure shows the locations in space where aerial

...
A series of images takes a tour of the area of a large catastrophic landslide and shows the unstable slope before the event.
May 31, 2017

Mud Creek topographic point clouds

Imagery shows topographic point clouds from photos, first from September 11, 2015 courtesy of California Coastal Records Project, second from March 8, 2017 (USGS photo), third from May 19, 2017 (USGS photo), and fourth from May 27, 2017 (USGS photo) 7 days following the catastrophic Highway 1 landslide. Last image shows the change in topography from the 2015 photo

...
3D maps created by computer processing of air photos show what the Mud Creek area looked like before and after the landslide
May 27, 2017

3D maps of air photos show views from before and after the landslide

Topographic “point clouds” (or 3D maps) created by computer processing of air photos show what the Mud Creek area looked like on March 8, 2017 (top), May 19 (center), and May 27 (bottom).

Filter Total Items: 986
USGS
May 23, 2012

CARNELIAN BAY, Calif. — Results of a new U.S. Geological Survey study conclude that faults west of Lake Tahoe, Calif., referred to as the Tahoe-Sierra frontal fault zone, pose a substantial increase in the seismic hazard assessment for the Lake Tahoe region of California and Nevada, and could potentially generate earthquakes with magnitudes ranging from 6.3 to 6.9. 

USGS
May 22, 2012

SANTA CRUZ, Calif. — The results of an innovative collaboration that paired artists from California's central coast and the greater San Francisco Bay Area with scientists from the U.S. Geological Survey's Pacific Coastal and Marine Science Center, will be on display at the R. Blitzer Gallery in Santa Cruz during June. 

Lassen Peak viewed from the south at the summit of Brokeoff Volcano...
May 22, 2012

On May 22, 1915 an explosive volcanic eruption occurred at Lassen Peak, California.

USGS
May 18, 2012

MENLO PARK, Calif. – Members of the news media are invited to attend the U.S. Geological Survey Open House in Menlo Park this weekend.  This event includes over 80 exhibits that highlight the work USGS scientists do. Join them in action as they share the excitement of their scientific work and discoveries with the general public. 

USGS
May 16, 2012

PORTLAND, Ore.­– The U.S. Geological Survey has developed models to help water managers identify strategies to use groundwater for meeting competing water demands in the semi-arid upper Klamath Basin. 

USGS
May 9, 2012

MENLO PARK, Calif. – Many Bay Area residents know what it’s like to experience an earthquake, but fewer of them know why earthquakes happen. The concepts behind earthquakes and living safely in earthquake country are as simple as a fishing line hooked to a stack of bricks, explains USGS geophysicist Ross Stein, whose family-friendly seismic demos and models are part of the...

USGS
May 7, 2012

CONTRA COSTA COUNTY, Calif. -- For the first time, scientists have measured the amounts of mercury flowing into the San Francisco estuary from tidal wetlands using a new technique that can measure concentrations of mercury in water every few minutes, which is essential for understanding mercury flows in a complex tidal estuarine environment. 

USGS
May 3, 2012

MENLO PARK, Calif. – Education and entertainment await visitors of all ages at the U.S. Geological Survey's Menlo Park Campus Open House on Saturday, May 19 and Sunday, May 20, from 10 a.m. to 4 p.m.

USGS
April 16, 2012

Building an Earthquake Early Warning System for California

USGS
March 22, 2012

SAN DIEGO —Organic solvents were detected at high concentrations in 18 percent of the aquifer system used for public supply in the San Fernando and San Gabriel basins. However, groundwater is not directly used as drinking water; water purveyors may treat groundwater before delivering it to customers to ensure compliance with water quality standards.

USGS
March 20, 2012

MENLO PARK, Calif. Decisions made by the global community about emissions will directly impact the future of the western United States.  On March 22nd, Tom Suchanek, U.S. Geological Survey climate change coordinator, will discuss how increasing atmospheric carbon dioxide might affect human land-use and environmental systems in California and the Bay Area. 

USGS
March 8, 2012

MENLO PARK, Calif.— The El Mayor-Cucapah earthquake in northern Baja California, Mexico on April 4, 2010 triggered surface movement on several Southern California faults. Detailed mapping of these small movements by the U.S. Geological Survey, California Geological Survey, and other institutions, revealed previously unknown faults in the greater Salton Sea area...