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

Water pressure/depth, velocity, and turbidity time-series data from SPA14 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...

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 ocean-currents projections: 20-year storm in Ventura County

Model-derived ocean current velocities (in meters per second) 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

Date published: January 1, 2017

Bathymetry hillshade--Offshore of Gaviota Map Area, California

This part of DS 781 presents data for bathymetry for several seafloor maps of the Offshore of Gaviota Map Area, California. The vector data file is included in "BathymetryHS_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 water-level projections: 1-year storm in Orange County

Model-derived total water levels (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 Souther

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 flood-hazard projections: 1-year storm in Los Angeles County

Projected Hazard: Geographic extent of projected coastal flooding, low-lying vulnerable areas, and maxium/minimum flood potential (flood uncertainty) associated with the sea-level rise and storm condition indicated.
Model Summary: The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of sto

Date published: January 1, 2017

Reprocessed boomer 3D seismic-reflection data of field activity P-04-11-CC in Estero Bay, offshore of Morro Bay, central California, 2012-08-12 to 2012-10-05

This dataset includes reprocessed boomer 3D seismic data collected by the Fugro Consultants Inc. in 2012, in Estero Bay, offshore of Morro Bay, central California.

Date published: January 1, 2017

Geology and geomorphology--Offshore of Point Conception Map Area, California

This part of DS 781 presents data for the geologic and geomorphic map of the Offshore of Point Conception map area, California. The vector data file is included in "Geology_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

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

Contour--Offshore of Point Conception Map Area, California

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

Date published: January 1, 2017

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

Geographic extent of projected coastal flooding, low-lying vulnerable areas, and maxium/minimum flood potential (flood uncertainty) associated with the sea-level rise and storm condition indicated.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosi

Date published: January 1, 2017

Water pressure/depth, velocity, and turbidity time-series data from SPB14 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

Filter Total Items: 481
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Year Published: 1994

Method to identify wells that yield water that will be replaced by Colorado River water in Arizona, California, Nevada, and Utah

Accounting for the use of Colorado River water is required by the U.S. Supreme Court decree, 1964, Arizona v. California. Water pumped from wells on the flood plain and from certain wells on alluvial slopes outside the flood plain is presumed to be river water and is accounted for as Colorado River water. A method was developed to identify wells...

Wilson, Richard P.; Owen-Joyce, Sandra J.
Method to identify wells that yield water that will be replaced by Colorado River water in Arizona, California, Nevada, and Utah; 1994; WRI; 94-4005; Wilson, Richard P.; Owen-Joyce, Sandra J.

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Year Published: 1993

Chapter C. The Loma Prieta, California, Earthquake of October 17, 1989 - Preseismic observations

The October 17, 1989, Loma Prieta, Calif., Ms=7.1 earthquake provided the first opportunity in the history of fault monitoring in the United States to gather multidisciplinary preearthquake data in the near field of an M=7 earthquake. The data obtained include observations on seismicity, continuous strain, long-term ground displacement, magnetic...

Johnston, Malcolm J. S.
Chapter C. The Loma Prieta, California, Earthquake of October 17, 1989 - Preseismic Observations; 1993; PP; 1550-C; The Loma Prieta, California, Earthquake of October 17, 1989: Earthquake Occurrence; Edited by Johnston, Malcolm J. S.

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Year Published: 1993

The Loma Prieta, California, Earthquake of October 17, 1989: Earthquake occurrence

Professional Paper 1550 seeks to understand the M6.9 Loma Prieta earthquake itself. It examines how the fault that generated the earthquake ruptured, searches for and evaluates precursors that may have indicated an earthquake was coming, reviews forecasts of the earthquake, and describes the geology of the earthquake area and the crustal forces...

Coordinated by Bakun, William H.; Prescott, William H.
The Loma Prieta, California, Earthquake of October 17, 1989: Earthquake Occurrence; 1993; PP; 1550; Coordinated by Bakun, William H.; Prescott, William H.

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Year Published: 1993

The Loma Prieta, California, Earthquake of October 17, 1989: Societal response

Professional Paper 1553 describes how people and organizations responded to the earthquake and how the earthquake impacted people and society. The investigations evaluate the tools available to the research community to measure the nature, extent, and causes of damage and losses. They describe human behavior during and immediately after the...

Coordinated by Mileti, Dennis S.
The Loma Prieta, California, Earthquake of October 17, 1989: Societal Response; 1993; PP; 1553; Coordinated by Mileti, Dennis S.

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Year Published: 1993

The Loma Prieta, California, earthquake of October 17, 1989 - Public response: Chapter B in The Loma Prieta, California, earthquake of October 17, 1989: Societal Response (Professional Paper 1553)

Major earthquakes provide seismologists and engineers an opportunity to examine the performance of the Earth and the man-made structures in response to the forces of the quake. So, too, do they provide social scientists an opportunity to delve into human responses evoked by the ground shaking and its physical consequences. The findings from such...

Bolton, Patricia A.
Chapter B. The Loma Prieta, California, Earthquake of October 17, 1989 - Public Response; 1993; PP; 1553-B; The Loma Prieta, California, Earthquake of October 17, 1989: Societal Response; Edited by Bolton, Patricia A.

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Year Published: 1992

Accounting System for Water Use by Vegetation in the Lower Colorado River Valley

The Colorado River is the principal source of water in the valley of the Colorado River between Hoover Dam and the international boundary with Mexico (fig. 1). Agricultural, domestic, municipal, industrial, hydroelectric-power genera-tion, and recreation are the primary uses of river water in the valley. Most of the consumptive use of water from...

Owen-Joyce, Sandra J.
Accounting System for Water Use by Vegetation in the Lower Colorado River Valley; 1992; OFR; 92-83; Owen-Joyce, Sandra J.

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Year Published: 1992

Chapter F. The Loma Prieta, California, Earthquake of October 17, 1989 - Marina district

During the earthquake, a total land area of about 4,300 km2 was shaken with seismic intensities that can cause significant damage to structures. The area of the Marina District of San Francisco is only 4.0 km2--less than 0.1 percent of the area most strongly affected by the earthquake--but its significance with respect to engineering, seismology,...

O'Rourke, Thomas D.
Chapter F. The Loma Prieta, California, Earthquake of October 17, 1989 - Marina District; 1992; PP; 1551-F; The Loma Prieta, California, Earthquake of October 17, 1989: Strong Ground Motion and Ground Failure; Edited by O'Rourke, Thomas D.

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Year Published: 1992

The Loma Prieta, California, Earthquake of October 17, 1989: Strong ground motion and ground failure

Professional Paper 1551 describes the effects at the land surface caused by the Loma Prieta earthquake. These effects: include the pattern and characteristics of strong ground shaking, liquefaction of both floodplain deposits along the Pajaro and Salinas Rivers in the Monterey Bay region and sandy artificial fills along the margins of San...

Coordinated by Holzer, Thomas L.
The Loma Prieta, California, Earthquake of October 17, 1989: Strong Ground Motion and Ground Failure; 1992; PP; 1551; Coordinated by Holzer, Thomas L.

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Year Published: 1991

The Loma Prieta earthquake, ground motion, and damage in Oakland, Treasure Island, and San Francisco

The basis of this study is the acceleration, velocity, and displacement wave-forms of the Loma Prieta earthquake (18 October 1989; M = 7.0) at two rock sites in San Francisco, a rock site on Yerba Buena Island, an artificial-fill site on Treasure Island, and three sites in Oakland underlain by thick sections of poorly consolidated Pleistocene...

Hanks, Thomas C.; Brady, A. Gerald

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Year Published: 1990

Ascension-Monterey Canyon system: history and development

No abstract available.

Greene, H. Gary; Hicks, Karen R.
Ascension-Monterey Canyon system: history and development; 1990; Book chapter; Book; Geology and tectonics of the central California coastal region; Greene, H. Gary; Hicks, Karen R.

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Year Published: 1990

National water summary 1987: Hydrologic events and water supply and use

Water use in the United States, as measured by freshwater withdrawals in 1985, averaged 338,000 Mgal/d (million gallons per day), which is enough water to cover the 48 conterminous States to a depth of about 2.4 inches. Only 92,300 Mgal/d, or 27.3 percent of the water withdrawn, was consumptive use and thus lost to immediate further use; the...

Carr, Jerry E.; Chase, Edith B.; Paulson, Richard W.; Moody, David W.
Attribution: Water, Central Midwest Water Science Center, Dakota Water Science Center, , , Kansas Water Science Center, Minnesota Water Science Center, Pennsylvania Water Science Center, Oklahoma-Texas Water Science Center, Utah Water Science Center, , Upper Midwest Environmental Sciences Center, Upper Midwest Water Science Center, Water Resources, Water Availability and Use Science Program, , , Region 4: Mississippi Basin, Region 6: Arkansas-Rio Grande-Texas-Gulf, , Region 7: Upper Colorado Basin, Region 1: North Atlantic-Appalachian, Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Puerto Rico, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, U.S. Virgin Islands, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, United States of America
National water summary 1987: hydrologic events and water supply and use; 1990; WSP; 2350; Carr, Jerry E.; Chase, Edith B.; Paulson, Richard W.; Moody, David W.

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Year Published: 1990

A water-resources data-network evaluation for Monterey County, California; Phase 3, Northern Salinas River drainage basin

This report evaluates existing data collection networks and possible additional data collection to monitor quantity and quality of precipitation, surface water, and groundwater in the northern Salinas River drainage basin, California. Of the 34 precipitation stations identified, 20 were active and are concentrated in the northwestern part of the...

Templin, W.E.; Schluter, R.C.
A water-resources data-network evaluation for Monterey County, California; Phase 3, Northern Salinas River drainage basin; 1990; WRI; 89-4123; Templin, W. E.; Schluter, R. C.

Filter Total Items: 1,116
View from the sky of a steep mountainous coastline with a massive landslide that's taken out the road.
May 27, 2017

Mud Creek landslide May 27 2017

View from an airplane looking at the Mud Creek landslide on the Big Sur coast that occurred May 20, 2017.

May 25, 2017

PubTalk 5/2017 — Underwater secrets of the Hayward fault zone

Title: Underwater Secrets of the Hayward Fault Zone: Integrated 3D imaging to understand earthquake hazards 

  • Underwater imaging provides a unique opportunity to study urban fault hazards.
  • How do we link surface structures to depths where earthquakes occur?
  • How does "acoustic trenching" help us understand earthquake history?
View of a beach from up high on a roof with a pier, gentle waves, lots of people on the sand, amusement park in background.
May 18, 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.

Man in orange vest stands knee-deep in stream with a net
May 15, 2017

An ecologist uses a net to collect a sample of aquatic invertebrates

As part of the Regional Stream Quality Assessments (RSQA), hydrologists, ecologists, and technicians did ecological surveys of aquatic biota and stream habitat.  Here, an ecologist uses a net to collect a sample of aquatic invertebrates for ennumeration and identification.

Stormwater flows from a graffiti-decorated outfall into urban Sausal Creek
May 14, 2017

Urban outfall to Sausal Creek

Graffiti adorns an outfall pipe discharging stormwater into Sausal Creek. Sausal Creek was one of the many urban creeks sampled by the Regional Stream Quality Assessment (RSQA).

Hydrologic technician holds up tile colonized by biofilm
May 13, 2017

Biofilms colonize a deployed tile

Biofilms take up pesticides in streams. Here, a hydrologic technician hold ups an unglazed ceramic tile that has been colonized by biofilm over 60-90 days. Learn more about biofilms as integrative samplers of pesticides here.

Attribution: Water Resources
Hydrologic technician collects biofilm from a ceramic tile
May 13, 2017

Biofilms colonize a deployed tile

Biofilms take up pesticides in streams. Here, a hydrologic technician collects a sample of biofilm that has colonized an unglazed ceramic tile over 60-90 days. Learn more about biofilms as integrative samplers of pesticides here.

Hydrologic technician collects biofilm from a ceramic tile
May 13, 2017

Biofilms colonize a deployed tile

Biofilms take up pesticides in streams. Here, a hydrologic technician collects a sample of biofilm that has colonized an unglazed ceramic tile over 60-90 days. Learn more about biofilms as integrative samplers of pesticides here.

Two men are waist-deep in a creek
May 13, 2017

Hydrologic technicians survey and record streambed characteristics

As part of the Regional Stream Quality Assessments (RSQA), hydrologists, ecologists, and technicians did ecological surveys of aquatic biota and stream habitat.  Here, two hydrologic technicians record characteristics of stream habitat.

Superimposed on beach photo: dense grid of blue dots across sandy beach and over ocean. Ditto 3 lines that cross the shore.
May 13, 2017

“Pixel instruments” on photo of beach in Santa Cruz, California

Frame from video of Cowells Beach in Santa Cruz, California, showing “pixel instruments” measured continuously during the video and used to estimate different coastal processes. The blue dots represent an array of pixels used by a computer program called cBathy to estimate seafloor depths (bathymetry). The red, orange, and yellow lines are cross-shore arrays of pixels used

...
Urban creek with concrete banks
May 12, 2017

Concrete channelization of urban creek

Sausal Creek in central Oakland, California, is an urban creek that has been extensively modified for flood control. The USGS Regional Stream Quality Assessment assessed the water quality and ecological integrity of small streams like Sausal Creek in five major regions of the country. Learn more about flow modification of U.S

...
Urban creek with concrete banks
May 12, 2017

Concrete channelization of urban creek

Sausal Creek in central Oakland, California, is an urban creek that has been extensively modified for flood control. The USGS Regional Stream Quality Assessment assessed the water quality and ecological integrity of small streams like Sausal Creek in five major regions of the country. Learn more about flow modification of U.S

...
Filter Total Items: 987
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...

USGS
February 29, 2012

SACRAMENTO, Calif.— Scientists at the U.S. Geological Survey have, for the first time, demonstrated how aquifer composition can affect how excessive levels of phosphorous (an essential nutrient contained in fertilizers) can be carried from fertilized agricultural fields via groundwater to streams and waterways. 

USGS
February 27, 2012

Waterfowl in California can spread low pathogenic avian influenza viruses during summertime when wetland temperatures are warm and waterfowl densities are low, according to a recent U.S. Geological Survey study.

USGS
February 21, 2012

MENLO PARK, Calif. — The U.S. Geological Survey and National Weather Service have developed the new FloodPath mapping system which allows scientists to produce maps of tomorrow's floods today – up to 3 days in advance of rising floodwaters.

USGS
February 9, 2012

The U.S. Geological Survey announces the establishment of the USGS California Volcano Observatory, or CalVO, headquartered within existing USGS facilities in Menlo Park, Calif. Establishing CalVO will increase awareness of and resiliency to the volcano threats in California, many of which pose significant threats to the economy and well being of the state and its inhabitants.

USGS
January 24, 2012

MENLO PARK, Calif. — Lassen Peak, the southernmost active volcano in the Cascade Range, erupted explosively in 1915 devastating nearby areas and sending volcanic ash as far away as 200 miles to the east.

Meeting between California Emergency Management Agency, CalVO, and ...
January 10, 2012

Welcome to the new USGS California Volcano Observatory website! The USGS Volcano Science Center recently restructured observatory operations to optimize volcano monitoring, eruption forecasting, and hazard mitigation efforts throughout California.

USGS science for a changing world logo
December 1, 2011

Differences in seismic activity along the San Andreas fault appear to be related to strength variations in the lower crust and upper mantle, as suggested by new findings in the Dec. 1 edition of Nature. 

CalVO staff assembled in the Rambo Auditorium, Menlo Park, CA...
November 30, 2011

During FY11, Long Valley Observatory's jurisdiction was expanded to encompass all California volcanoes and one volcanic center in Nevada. The Observatory's name will change to California Volcano Observatory (CalVO), which will correspond to a new website launch in early 2012.

USGS science for a changing world logo
November 15, 2011

New insights from recent Glen Canyon Dam high-water flow experiments on the Colorado River will be shared by USGS scientists on Wednesday night. They will discuss the results from these high-water flows in Grand Canyon National Park and describe the challenge of adaptively managing a highly regulated river.

USGS science for a changing world logo
November 7, 2011

Nearly 124,000 high resolution scans of the more than 200,000 historical USGS topographic maps, some dating as far back as 1884, are now available online. TheHistorical Topographic Map Collection includes published U.S. maps of all scales and editions, and are offered as a georeferenced digital download or as a scanned print from the USGS Store.

USGS science for a changing world logo
November 2, 2011

USGS scientists and academic colleagues investigated how California's interconnected San Francisco Bay and Sacramento-San Joaquin Delta (the Bay-Delta system) is expected to change from 2010 to 2099 in response to both fast and moderate climate warming scenarios.