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.

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Filter Total Items: 501
Date published: January 1, 2015

Seafloor character from air-photo data-Santa Barbara Channel

Seafloor character was derived from interpretations of aerial photograph-derived kelp-distribution data available for Santa Cruz Island in the Santa Barbara Channel, California (Kushner and others 2013). The number of substrate classes was reduced because rugosity could not be derived for all areas.

Date published: January 1, 2015

Seafloor character from multibeam echo sounder data-Santa Barbara Channel

Substrate was classified using the method of (Cochrane 2008) for this study multibeam sonar. Sea floor character derived from multibeam sonar data is available for the mainland coast within the study area from the California State Waters Mapping Program (Johnson and others, 2012; Johnson and others, 2013a; Johnson and others, 2013b; Johnson and others, 2013c). The number of

Date published: January 1, 2015

Seafloor character from lidar data-Santa Barbara Channel

Seafloor character was derived from interpretations of lidar data available for the mainland coast within the study area from the California State Waters Mapping Program (Johnson and others, 2012; Johnson and others, 2013a; Johnson and others, 2013b; Johnson and others, 2013c). The number of substrate classes was reduced because rugosity could not be derived for all areas.

Date published: January 1, 2015

Seafloor character from sidescan sonar data-Santa Barbara Channel

Substrate was classified using the method of (Cochrane and Lafferty, 2002) for this study. Sea floor character derived from towed sidescan sonar data is available for the mainland coast within the study area from USGS online publications (Cochrane and others, 2003; Cochrane and others, 2005). The number of substrate classes was reduced because rugosity could not be derived for all

Date published: February 26, 2014

Soil Water Deficit Estimates (California Drought) for the Basin Characterization Model

Soil water deficit was calculated from soil moisture storage simulated for Jan. 1, 2014 for 23 water-supply basins surrounding the California Central Valley that drain to the Bay-Delta by using the monthly California Basin Characterization Model and ArcGIS. 

Date published: January 1, 2014

CoSMoS Southern California projected flooding hazards

ZIP file (3.6 MB) contains three files when uncompressed: 

  • an essential readme.txt file and
  • model projections of two Southern California flooding hazard scenarios:
     - ARkStorm, and
     - January 2010 El Niño and Sea-Level Rise.

For more information, see ...

Date published: January 1, 2014

Bathymetry--Drakes Bay and Vicinity, California

This part of DS 781 presents data for the bathymetry map of Drakes Bay and Vicinity, California (raster data file is included in "Bathymetry_DrakesBay.zip," which is accessible from https://pubs.usgs.gov/ds/781/DrakesBay/data_catalog_DrakesBay.html. These data accompany the pamphlet and map sheets of Watt, J.T.,...

Date published: January 1, 2014

Isopachs--Bolinas to Pescadero, California

This part of DS 781 presents data for the isopachs for the Bolinas to Pescadero, California, region. The vector data file is included in "Isopachs_BolinastoPescadero.zip," which is accessible from https://pubs.usgs.gov/ds/781/BolinasToPescadero/data_catalog_BolinasToPe....

As part of the...

Date published: January 1, 2014

Transgressive Contours--Bolinas to Pescadero, California

This part of DS 781 presents data for the depth-to-transition map of the Bolinas to Pescadero, California, region. The raster data file is included in "TransgressiveContours_BolinasToPescadero.zip," which is accessible from https://pubs.usgs.gov/ds/781/BolinasToPescadero/data_catalog_BolinasToPe......

Date published: January 1, 2014

Seafloor character--Drakes Bay and Vicinity, California

This part of DS 781 presents the seafloor-character map of the Drakes Bay and Vicinity map area, California (raster data file is included in "SeafloorCharacter_DrakesBay.zip," which is accessible from https://pubs.usgs.gov/ds/781/DrakesBay/data_catalog_DrakesBay.html). These data accompany the pamphlet and map...

Date published: January 1, 2014

Depth to Transition--Bolinas to Pescadero, California

This part of DS 781 presents data for the depth-to-transition map of the Bolinas to Pescadero, California, region. The raster data file is included in "DepthToTransition_BolinastoPescadero.zip," which is accessible from https://pubs.usgs.gov/ds/781/BolinasToPescadero/data_catalog_BolinasToPe......

Date published: January 1, 2014

Sediment Thickness--Bolinas to Pescadero, California

This part of DS 781 presents data for the sediment-thickness map of the Bolinas to Pescadero, California, region. The raster data file is included in "SedimentThickness_BolinastoPescadero.zip," which is accessible from http://pubs.usgs.gov/ds/781/BolinastoPescadero/data_catalog_BolinastoPes......

Filter Total Items: 969
Man gestures to a map hanging on a wall, like he's telling a story about it.
June 11, 2015

Sam Johnson explains details of a fault zone

Sam Johnson explaining details of the Hosgri fault zone at USGS offices in Santa Cruz.

May 21, 2015

PubTalk 5/2015 — Breaking Badly:Forecasting California Earthquakes

by Morgan Page, USGS Research Geophysicist

  • Scientists cannot currently predict the precise time, location, and size of future damaging earthquakes.
  • Historical records of earthquakes in California date back over 150 years.
  • Geologists have dug trenches to extend the known history on some faults back to around 1,000 years before
Computer simulation that shows water depth of a large bay, deeper water highlighted by darker colors.
May 18, 2015

Colored Shaded-Relief Bathymetry of San Francisco

 This colored shaded-relief bathymetry map of the Offshore of San Francisco map area in northern California was generated from bathymetry data collected by California State University, Monterey Bay (CSUMB) and by Fugro Pelagos (fig. 1). Most of the area was mapped by CSUMB in 2004, 2005, 2007, and 2008; a small offshore portion near the southern boundary of the map area

...
May 2, 2015

Mojave Golden Eagles

This short video features incredible and graphic images and video of golden eagle prey. These birds are eating machines. USGS biologist-rock climbers install nest cameras to study the eating habits of golden eagles and their young in the Mojave Desert. This work goes towards creating a Prey Availability Habitat Model to better site green energy projects so that they will

April 23, 2015

PubTalk 04/2015—"Fearfully Grand" Eruptions: Lassen Peak, CA, 1914-17

Title: A Sight "Fearfully Grand" Eruptions of Lassen Peak, California, 1914 to1917

  • A summary of the eruptions and their effects
  • Illustrated with historical photographs
Experimental laboratory setup to study uranium uptake by aquatic organisms
April 16, 2015

Experimental laboratory setup to study uranium uptake

Bio-Uptake Research Laboratory — Menlo Park, California. Experimental laboratory setup to study uranium uptake by aquatic organisms.

Plot of earthquakes in Mount Shasta region greater than M1.0 from A...
April 3, 2015

Plot of quakes in Mount Shasta region greater M1.0 from 2010 to 2016

Plot of earthquakes in Mount Shasta region greater than M1.0 from April 3, 2010 to April 3, 2015.

Earth As Art image of California's Mohave Desert
April 3, 2015

Contrails

Like scratches on a marble table, airplane contrails cut across the southern California Mojave Desert. The shadows from the contrails cast dark lines across the ground. Contrails form when cold, dry air mixes with warmer aircraft exhaust. Mountains and a few dry lakebeds provide a backdrop to this scene, along with bright green spots of agriculture along the Colorado River

...
March 26, 2015

PubTalk 3/2015 — The Environmental Legacy of California's Gold Rush

by Andrea Foster, USGS Research Geologist & Christopher Kim, Associate Professor, Chapman University

  • Why are arsenic and mercury associated with California's gold mines?
  • What types of arsenic and mercury contamination can be directly related to historic mining?
  • How are geochemists studying the distribution and
USGS Research Geologist uses a field meter to measure magnetic susceptibility of basalt flows in the Mojave Desert.
March 12, 2015

Measuring magnetic susceptibility in the field

Research Geologist Geoff Phelps measuring basalt flow thickness and magnetic susceptibility of individual basalt flows of the Broadwell Mesa Basalt in the central Mojave Desert near Ludlow, CA. 

Research geologist using satellite imagery on tablet computers to conduct geologic mapping on a mule pack train.
March 10, 2015

Digital mapping supported by mule team

Research Geologist Kevin Schmidt and Geoff Phelps examine satellite imagery on tablet computers during geologic mapping field work near Broadwell Mesa while supported by mule pack train.  

Tubes used for collecting groundwater samples protruding from a nested groundwater well
March 8, 2015

Groundwater Sampling

A groundwater well that is outfitted with equipment to collect samples to test for several water quality parameters.

Filter Total Items: 927
USGS science for a changing world logo
September 21, 2009

Idaho Developed Mapping Method Garners Prestigious Award. Data from earth observing Landsat satellites plays a central role in a new, award-winning type of mapping that tracks water use. Water-use maps help save taxpayer money by increasing the accuracy and effectiveness of public decisions involving water – for instance, in monitoring compliance with legal water rights. The maps are especially

USGS science for a changing world logo
September 16, 2009

New hydrologic studies in the Walker River basin and Walker Lake will guide policy makers in the management of scarce water resources. Agricultural practices between 1882 and 2008 resulted in a significant drop in Walker Lake's water level, and caused the Lake to become more saline.

USGS science for a changing world logo
September 9, 2009

The winter distribution of Pacific brant, a small, dark sea goose, has shifted northward from low-temperate areas such as Mexico to sub-Arctic areas as Alaska's climate has warmed over the last four decades, according to a just-released article in Arctic.

USGS science for a changing world logo
September 4, 2009

USGS will track cause and extent of ground sinking near California Aqueduct. The latest satellite tracking data will be used to help scientists gain a better understanding of how land subsidence is affecting the state-owned California Aqueduct in California's San Joaquin Valley.

USGS science for a changing world logo
August 14, 2009

Climate change, ecosystem health, bird populations, food webs, and sea-level rise are a few of the topics considered in a scientific symposium about San Francisco Bay.

USGS science for a changing world logo
August 13, 2009

Residents and critical infrastructure in the nation's six highest-risk volcanic areas—including the Southwest region of the United States -- will benefit from increased monitoring and analysis as a result of Recovery Act funds being channeled into volcano monitoring, Secretary Salazar announced today.

USGS science for a changing world logo
July 29, 2009

Large trees have declined in Yosemite National Park during the 20th century, and warmer climate conditions may play a role. The number of large-diameter trees in the park declined 24 percent between the 1930s and 1990s.

USGS science for a changing world logo
July 28, 2009

The Salton Sea is California's largest lake. Its salinity is about 30% greater than the Pacific Ocean. Because of its location, the Salton Sea is critical to more than 400 species of migratory birds on the Pacific and Central flyways.
USGS public lecture on restoring California's "Inland Sea" -- the role of science in restoration of the unique Salton Sea environment.

USGS science for a changing world logo
July 24, 2009

For the first time in nearly 50 years, a population of a nearly extinct frog has been rediscovered in the San Bernardino National Forest's San Jacinto Wilderness.

USGS science for a changing world logo
July 10, 2009

Celebrating the 125th anniversary of its national topographic mapping program, the U.S. Geological Survey will showcase its latest high-resolution geospatial data and state-of-the-art mapping technology at the annual ESRI Users Conference in San Diego, California, July 13 – 17, at the San Diego Convention Center.

USGS science for a changing world logo
July 9, 2009

125th Anniversary of the USGS Topographic Mapping Program
In a bold, visionary statement to Congress on December 5, 1884, USGS Director, John Wesley Powell announced, "A Government cannot do any scientific work of more value to the people at large than by causing the construction of proper topographic maps of the country."

USGS science for a changing world logo
June 30, 2009

The sluggish recovery of the southern sea otter of California, a threatened population on the Endangered Species list, appears to have stalled once again. U.S. Geological Survey scientists say the latest 3-year average (2,813 sea otters) was 0.5 percent lower than last year, the first time the trend has been negative since the late 1990s.