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: 580
Date published: January 1, 2016

Depth to Transition--Point Conception to Hueneme Canyon, California

This part of DS 781 presents data for the depth-to-transition map of the Point Conception to Hueneme Canyon, California, region. The raster data file is included in "DepthToTransition_PointConceptionToHuenemeCanyon.zip," which is accessible from http://dx.doi.org/10.5066/F7891424.

As part of the USGS's California State Waters Mapping...

Date published: January 1, 2016

Fluctuating Asymmetry in Waterbirds in Relation to Mercury Exposure

The dataset includes the bird species, sex, mercury concentration in breast feathers and whole blood, and the composite measure of fluctuating asymmetry. Statistical models were developed for each species to analyze the relationship between mercury exposure in either breast feathers or whole blood and the composite measure of fluctuating asymmetry, while accounting for the sex of each bird....

Date published: January 1, 2016

Raw, high-resolution, chirp seismic-reflection data collected in San Pablo Bay (northern California) during field activity 2014-639-FA from 10/06/2014 to 10/10/2014

This dataset includes raw, high-resolution chirp seismic-reflection data collected in 2014 by the U.S. Geological Survey (USGS) in San Pablo Bay, northern California.

Date published: January 1, 2016

Bullet fragments in Belding's ground squirrels in Oregon and California in 2014-2015

The dataset includes specifics on fragments of bullets recovered from shot Belding's ground squirrels from Oregon and California. Ground squirrels were radiographed and then we used ImageJ software to count and measure the area of those bullet fragments.

Date published: January 1, 2016

Isopachs--Point Conception to Hueneme Canyon, California

This part of DS 781 presents data for the isopachs for the Point Conception to Hueneme Canyon, California, region. The vector data file is included in "Isopachs_PointConceptionToHuenemeCanyon.zip," which is accessible from https://doi.org/10.5066/F7891424.

As part of the USGS's California State Waters Mapping Project, a 50-m grid of...

Date published: January 1, 2016

Raw, high-resolution seismic-reflection data collected between Shelter Cove and Fort Bragg (northern California) during field activity B-5-10-NC from 09/20/2010 to 10/01/2010

This dataset includes raw, high-resolution seismic-reflection data jointly collected by the U.S. Geological Survey (USGS) and Oregon State University in 2010, between Shelter Cove and Fort Bragg in northern California.

Date published: January 1, 2016

Processed, high-resolution, chirp seismic-reflection data collected in San Pablo Bay (northern California) during field activity 2014-639-FA from 10/06/2014 to 10/10/2014

This dataset includes processed, high-resolution chirp seismic-reflection data collected in 2014 by the U.S. Geological Survey (USGS) in San Pablo Bay, northern California.

Date published: January 1, 2016

Swell-filtered, high-resolution seismic-reflection data collected between Shelter Cove and Fort Bragg (northern Califrnia) during field activity B-5-10-NC from 09/20/2010 to 10/01/2010

This dataset includes swell-filtered, high-resolution seismic-reflection data jointly collected by the U.S. Geological Survey (USGS) and Oregon State University in 2010, between Shelter Cove and Fort Bragg in northern California.

Date published: January 1, 2016

Bathymetric measurements of Little Holland Tract, Sacramento-San Joaquin Delta, California, 2015, from personal watercraft

Bathymetric data were collected by the U.S. Geological Survey (USGS) in 2015 for Little Holland Tract in the Sacramento-San Joaquin River Delta, California. The data were collected using a personal watercraft (PWC) platform that consisted of Trimble R7 Global Navigation Satellite System (GNSS) receivers with Zephyr 2 antennas, combined with Odom Echotrac CV-100 single-beam echosou

Date published: January 1, 2016

Swell-filtered, high-resolution seismic-reflection data collected between Punta Gorda and Fort Bragg (northern California) during field activity B-04-12-NC from 09/17/2012 to 09/25/2012

This dataset includes swell-filtered, high-resolution seismic-reflection data jointly collected by the U.S. Geological Survey (USGS) and Oregon State University in 2012, between Punta Gorda and Fort Bragg in northern California.

Date published: January 1, 2016

Magnetic-field level data collected between Punta Gorda and Fort Bragg (northern California) during field activity B-04-12-NC from 09/17/2012 to 09/25/2012

This dataset includes Magnetic-field level data jointly collected by the U.S. Geological Survey (USGS) and Oregon State University in 2012, between Punta Gorda and Fort Bragg in northern California.

Date published: December 28, 2015

Coastal and Marine Geology Program video and photograph portal

This portal contains video and photography of the seafloor and aerial imagery along much of the coastal U.S. For the first time, this portal makes many video and photo datasets available to explore in an easy-to-use geospatial viewer. This portal was originally developed to serve imagery from the USGS's Coastal and Marine Hazards and Resources Program Seafloor Mapping projects and Hurricane...

Filter Total Items: 1,109
Wind turbines at the Altamont Pass Wind Farm
September 8, 2016

Wind turbines at the Altamont Pass Wind Farm

The Altamont Pass Wind Far is located in northern California.

September 1, 2016

What is the Delta?

This short video is intended to serve as an introduction to the Sacramento and San Joaquin Delta, and is the first in a series of four short videos highlighting USGS science in the San Francisco Bay and Sacramento-San Joaquin Delta Estuary. This video serves to orient the viewer to physical characteristics of the Delta, the challenges facing it, and the work the USGS is

August 25, 2016

Tarantula Hawk

Tarantula hawk wasps sting and paralyze tarantulas to feed their young. USGS Ecologist Todd Esque captured this video of a tarantula hawk wasp dragging a tarantula through the desert in Mexico. 

August 25, 2016

Public Lecture Series — The New Eyes in the Sky

Putting Drones to Work for Scientific Research
By: Jeff Sloan, Geographer, Project Leader — USGS National Unmanned Systems Project Office

  • Why is there so much interest in unmanned technology?
  • What are the rules to legally  y within the National Airspace?
  • How does this technology increase safety, lower costs, and
A few tiny leaves on a branch
August 24, 2016

New tamarisk leaves re-grow after tamarisk leaf beetle defoliation

Tamarisk leaves regrow following defoliation by the biological control agent, tamarisk leaf beetle (Diorhabda spp.).

August 23, 2016

Golden Eagle Flight

Golden eagles can be killed by colliding with a number of human-made objects, including wind turbines. USGS research wildlife biologist Todd Katzner describes his studies of golden eagle flight. This research is being done to model flight behavior which might help managers understand how placement of wind turbines might pose significant risks to golden eagles.

 

Dead and living trees near a river
August 22, 2016

Defoliated nonnative tamarisk with native cottonwood trees

Nonnative tamarisk can form mixed stands with native trees, such as cottonwoods, and other nonnative trees, such as Russian olive. 

A mostly dead bush with one living branch
August 22, 2016

Tamarisk re-grows new leaves after tamarisk leaf beetle defoliation

Tamarisk can re-grow new leaves after being defoliated by the biocontrol agent tamarisk leaf beetle (Diorhabda spp.).

mostly dead bush re-sprouting after fire
August 22, 2016

Nonnative tamarisk is fire resistant

Nonnative tamarisk is resistant to wildfire, in part due to its abilty to resprout from the its roots.

Satellite image showing the spread of the Soberanes Fire
August 14, 2016

Landsat Shows Spread of Soberanes Fire

A wildfire near Soberanes Creek along the Pacific coast of California started July 22, 2016, and spread to over 86,000 acres one month later. Landsat images from July 13, July 29, and August 14 show the dramatic progression as active fire burns orange in the latter two scenes, and smoke appears as a blue haze.

Model of reservoirs underneath Long Valley Caldera...
August 8, 2016

Model of reservoirs underneath Long Valley Caldera

Main hydrothermal features of the new (2016) 3-D model of the subsurface at Long Valley Caldera. This schematic is based on a survey of the electrical properties of the earth (magnetotellurics) below. Arrows show subsurface water flow, with colors keyed to changing water temperature, from blue (cold) to red (hot). Purple arrows show an extinct hot water pathway. See 2016

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July 28, 2016

July Public Lecture — USGS CalVO: It's not just earthquake country!

Volcanic eruptions occur int he State about as frequently as the large San Andreas Fault Zone earthquakes. California's "watch list" volcanoes are dispersed throughout the State and future eruptions are inevitable—the likelihood of renewed volcanism is on the order of one in a few hundred to one in a few thousand annually.

With Margaret Mangan, Scientist-in-Charge,

Filter Total Items: 985
USGS science for a changing world logo
September 22, 2009

On October 17, the San Francisco Bay Area will be marking the 20th anniversary of the 1989 Loma Prieta earthquake -- the Bay Area's most significant and destructive earthquake during recent times. As part of the anniversary commemoration, the U.S. Geological Survey is holding an evening public lecture about scientific and technological advances in earthquake studies achieved since 1989.

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."