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: March 4, 2016

Current Alerts for U.S. Volcanoes

Volcano-alert notifications are produced by Volcano Observatory scientists based on analysis of data from monitoring networks, direct observations, and satellite sensors. They are issued for both increasing and decreasing volcanic activity and include text about the nature of the unrest or eruption and about potential or current hazards and likely outcomes.

Date published: March 3, 2016

California State Waters Map Series Data Catalog--Offshore of Monterey, California

Each GIS data file for the Offshore of Monterey map area is listed below with a brief description, a small image, and links to the metadata files and the downloadable data files. The data were compiled in ArcMap (version 10.2.2, ESRI, 2014). Raster data layers are registered TIFF images and are in the UTM Zone 10 coordinate system. Point, line, and polygon features are in shapefile format and...

Date published: January 4, 2016

Marine geophysical data—Point Sal to Refugio State Beach, southern California

This data release includes approximately 1,032 km of marine single-channel seismic-reflection data collected by USGS on a research cruise in July and August, 2014, between Point Sal and Refugio State Beach. The dataset includes 168 profiles, most of which were collected on tracklines roughly perpendicular to the coast at 1 km line spacing; additional profiles were collected...

Date published: January 1, 2016

Transgressive Contours--Point Conception to Hueneme Canyon, California

This part of DS 781 presents data for the transgressive contours for the Point Conception to Hueneme Canyon, California, region. The vector file is included in "TransgressiveContours_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

Swell-filtered, high-resolution seismic-reflection data collected between Fort Bragg and Point Arena (northern Califrnia) during field activity C-1-10-NC from 08/09/2010 to 08/15/2010

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 Fort Bragg and Point Arena in northern California.

Date published: January 1, 2016

Raw, high-resolution seismic-reflection data collected between Fort Bragg and Point Arena (northern California) during field activity C-1-10-NC from 08/09/2010 to 08/15/2010

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 Fort Bragg and Point Arena in northern California.

Date published: January 1, 2016

Navigation data for marine geophysical 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 navigation data for marine geophysical 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

Sediment Thickness--Point Conception to Hueneme Canyon, California

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

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

Date published: January 1, 2016

Navigation data for marine geophysical 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 navigation data for marine geophysical 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

Raw, 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 raw, 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

Navigation data for marine geophysical data collected collected between Fort Bragg and Point Arena (northern Califrnia) during field activity C-1-10-NC from 08/09/2010 to 08/15/2010

This dataset includes navigation data for marine geophysical data jointly collected by the U.S. Geological Survey (USGS) and Oregon State University in 2010, between Fort Bragg and Point Arena in northern California.

Date published: January 1, 2016

Navigation data for 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 navigation data for chirp seismic-reflection data collected in 2014 by the U.S. Geological Survey (USGS) in San Pablo Bay, northern California.

Filter Total Items: 1,109
man pointing to image on computer screen in an office setting
December 31, 2016

Geologist explains photo analysis of Calif. coastal cliffs

USGS research geologist Jon Warrick explains how his team applied structure-from-motion analysis to photos from the California Coastal Records Project to measure coastal change. Jon Warrick explains a “difference map” constructed from structure-in-motion data. Red areas indicate loss of material (erosion); blue areas show addition of material (deposition).

December 13 - 14, 2016 Long Valley Caldera earthquake swarm recorde...
December 14, 2016

Dec. 13 - 14, 2016 Long Valley Caldera earthquake swarm recorded on...

December 13 - 14, 2016 Long Valley Caldera earthquake swarm recorded on instrument MDH1 webicorder. Swarm begins at 23:28 PST.

Two USGS Hydrologists taking water sample
November 28, 2016

Discover the great things going on in the Bay-Delta

Two USGS Hydrologists taking water sample

November 17, 2016

PubTalk 11/2016 — Ecological Stressors

Ecological Stressors: It's a Lot of 'WERC'
"There's is no place like California" by A. Keith Miles, Center Director, USGS Western Ecological Research Center

Highlights of the science of the USGS Western Ecological Research Center: 

  • Wildlife, drought, sea level rise
  • Endangered species, species of concern
  • Alternate energy,
October 27, 2016

PubTalk 10/2016 — Rockfalls in California's Sierra Nevada

Rock falls in California’s Sierra Nevada - Pursuing explanations for exfoliation and seemingly spontaneous fracture of rock
 

Two sea otters floating on their backs in water.
October 21, 2016

Sea Otters

Three of the nine wild sea otter populations in the U.S. are federally listed as threatened. In California, USGS biologists have lead an annual population census to assess the local populations' recovery, working closely with state agencies and the Monterey Bay Aquarium.

October 19, 2016

B-roll Sampling and Coring in San Pablo Bay

All clips show the deck of a barge in San Pablo Bay, California.

  • Clip 1 - USGS technicians lower and raise a grab sampler
  • Clips 2, 3, 4 - USGS technicians lower and raise a vibracore
  • Clip 5 - Tanker passes as USGS technicians work on anchor lines
  • Clip 6 - USGS technicians raise anchor, while another works on a vibracore tube
People standing on a boat preparing an instrument for deployment, into the water.
October 6, 2016

Sediment trap deployment

Sediment trap is being prepared for deployment into Monterey Canyon offshore of Monterey, California.

Men stand on a boat wearing safety gear and they are deploying instrumentation into the water using cables and ropes.
October 6, 2016

Deploying instrument package into Monterey Canyon

On October 6, 2016, scientists lower an instrument package on a taut-wire mooring into the canyon. The sediment trap (long funnel-shaped device) is designed to capture mud and sand carried in turbidity flows; the other sensors measure currents and suspended sediment.

September 30, 2016

Alluvial Thickness Model, Yucaipa area, California

To help visualize the Yucaipa groundwater basin geometry, this animation of the elevation of the top of the basement rocks was created. The animation allows the viewer to “fly” over the Yucaipa groundwater basin, viewing the land surface, geology (grouped by major geologic perioid and colored by deposit type), faults (color coded based on location), wells in different

a person stands on a rocky beach wearing sunglasses and a backpack with an antenna.
September 16, 2016

Christie Hegermiller geared up for beach elevation survey

Christie gears up to survey beach elevation in Santa Cruz, CA with a precise and accurate GPS unit mounted to her backpack. The GPS unit on her backpack communicates with a nearby "base station" to minimize errors in location.

Filter Total Items: 985
USGS science for a changing world logo
December 7, 2009

At a loss for gift ideas? Or just plain lost? The Map and Publication Sales office (MaPS) is offering unusual, free holiday wrapping paper, in the form of outdated topographical maps to promote recycling and to save the colorful but space-consuming maps from landfill.

USGS science for a changing world logo
December 2, 2009

Native Americans of the Miwok tribe in the northern Sierra Nevada, California, were one of the first groups to move from a hunter-gatherer activity to manufacturing, producing salt for trade.

USGS science for a changing world logo
November 20, 2009

Toxins in coal-tar-based sealcoats in parking lots may be the culprit in contaminated house dust, according to a USGS study. PAHs – or polycyclic aromatic hydrocarbons – are large molecules found in oil, coal and tar deposits, and can have toxic effects.

USGS science for a changing world logo
November 4, 2009

Greater sage-grouse populations have declined substantially in many areas in the West, though populations in some locations remain relatively stable, according to a comprehensive publication written by federal, state, and non-governmental organizations. The population assessment is one of numerous sage-grouse topics covered in the 24 chapters released today.

USGS science for a changing world logo
October 17, 2009

Twenty years after the Loma Prieta earthquake caused loss of life and widespread property damage, advances in science, technology and engineering have the San Francisco Bay Area better prepared for the next big earthquake. When the Loma Prieta quake hit just after 5 p.m. October 17, 1989 – 20 years ago Saturday – the digital age was in its infancy.

USGS science for a changing world logo
October 15, 2009

As people in northern California begin to assess damage from the high winds and heavy rain of October 13 and 14, they may wonder what hit them.

USGS science for a changing world logo
October 13, 2009

On October 17, minutes before the scheduled start of the third game of the 1989 World Series in San Francisco, a magnitude 6.9 earthquake rocked the California coast from Monterey to San Francisco.

USGS science for a changing world logo
October 8, 2009

On October 17, minutes before the scheduled start of the third game of the 1989 World Series in San Francisco, a magnitude 6.9 earthquake rocked the California coast from Monterey to San Francisco. Centered near Loma Prieta peak in the mountains south of San Jose, the quake killed 63 people and caused an estimated $6 billion to $10 billion in property loss.

USGS science for a changing world logo
October 6, 2009

Rainstorms this year in the area burned by the Station Fire have the potential to trigger debris flows that may impact neighborhoods at the base of the San Gabriel Mountains as well as areas in Big Tujunga Canyon, Pacoima Canyon, Arroyo Seco, West Fork of the San Gabriel River, and Devils Canyon, according to an assessment released today by the U.S. Geological Survey.

USGS science for a changing world logo
September 24, 2009

USGS will Grant Universities $5 Million to Beef Up Public Safety Grants totaling $5 million under the American Recovery and Reinvestment Act are being awarded to 13 universities nationwide to upgrade critical earthquake monitoring networks and increase public safety.

USGS science for a changing world logo
September 23, 2009

Keeping up with plants: the challenge for Arctic geese: A large-scale redistribution of geese seems to be occurring in boreal and tundra ecosystems, perhaps because of the changing balance and distribution of the plants they eat.