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: 406
Date published: February 24, 2020
Status: Active

Science Seminar Series

Upcoming public seminars at the Pacific Coastal and Marine Science Center in Santa Cruz, California will be listed here. Get directions to our Center.
Also, check out our archive of past seminars.

Date published: February 18, 2020
Status: Active

Evaluation of groundwater resources of the Anza-Terwilliger area, Anza, California

Groundwater is the sole source for water use to the rural community and two Native American tribes in the Cahuilla Valley and Terwilliger Valley groundwater basins, which are located approximately 35 miles southwest of Palm Springs, California. The characteristics and sustainable yield of the basins are not well understood and are threatened by increasing water use and potential changes in...

Date published: January 22, 2020
Status: Active

Using Unmanned Aerial Systems (UAS) Capabilities to Help Identify Giant Salvinia (Salvinia molesta) and the effects of Salvinia weevil (Cyrtogagous salviniae)

USGS is collecting remotely sensed data to classify Salvinia molesta, a non-native aquatic species that reduces light and oxygen levels in water, making it unsuitable for fish and other aquatic plant life.

Date published: January 2, 2020
Status: Active

California Seafloor and Coastal Mapping Program

A Foundation for Characterizing Hazards, Monitoring Change, and Managing Resources

Date published: December 31, 2019
Status: Active

California Seafloor Mapping Program mapping progress

Table shows USGS California Seafloor Mapping Program progress by block number, as of August 2019.

Date published: December 11, 2019
Status: Completed

Tsunami Record from the Great 1906 San Francisco Earthquake

Shortly after the Great San Francisco earthquake of April 18, 1906, a sea level disturbance (tsunami) was recorded at the Presidio tide gauge station in San Francisco (the station is now located nearby at Ft. Point). What type of mechanism (earthquake rupture, landslide, other) generated the tsunami...

Contacts: Eric Geist
Date published: November 22, 2019
Status: Active

Creating a Model to Predict Future Carbon Levels in Tidally-driven Marshes

Tidal marshes are important ecosystems in the San Francisco-Bay Delta. They remove carbon from the atmosphere, they build up soils that buffer our communities from sea level rise, they provide critical habitat and food resources for a diversity of species, and they reduce excessive nutrients which have a negative impact on water quality. As a result of land-use change and urbanization, the San...

Date published: November 14, 2019
Status: Active

Attending Seminars at PCMSC

Check our schedule for upcoming seminars and dates.

Date published: November 13, 2019
Status: Active

Earthquake Early Warning Seismic Station Adjustment Terms - Annemarie Baltay

Earthquake early warning, live in California, aims to send user alerts before ground shaking arrives at their location. Work directly with a USGS team in implementing a ground-motion based early warning algorithm, and develop novel station-specific adjustment factors to improve the accuracy of ground-shaking estimates, a critical step in sending the most useful user alerts.

Date published: October 23, 2019
Status: Active

San Francisco Bay Area – SF Peninsula (BALT4) Site near Pacifica, CA

Recent Conditions

The instruments for this site were installed in the winter of 2012 and are used to monitor and detect changes in local conditions.  Soil water content and ground water pressure are monitored at two nests on the same hillslope.  Data for the site include:

  • ...
Contacts: Brian Collins
Date published: October 23, 2019
Status: Active

San Francisco Bay Area – SF Peninsula (BALT3) Site near Brisbane, CA

Recent Conditions

The instruments for this site were installed in the summer of 2011 and are used to monitor and detect changes in local conditions.  Soil water content and ground water pressure are monitored at two nests on the same hillslope.  Data for the site include:

  • ...
Contacts: Brian Collins
Date published: October 23, 2019
Status: Active

San Francisco Bay Area – Marin County (BALT2) Site near San Rafael, CA

Recent Conditions

The instruments for this site were installed in the winter of 2010 and are used to monitor and detect changes in local conditions.  Soil water content and ground water pressure are monitored at two nests on the same hillslope.  Data for the site include:

  • ...
Contacts: Brian Collins
Filter Total Items: 520
Date published: April 29, 2020

Partitioning of six pyrethroid insecticides at varying salinities

To determine aqueous pyrethroid partitioning across a salinity gradient 20 mL Pyrex beakers were filled with 8 mL of deionized water at varying salinities (0, 0.5, 2, 6 ppt). Salinity was adjusted using a 10 ppt stock solution (made by diluting Instant Ocean into deionized water). The water samples were spiked with pyrethroids (bifenthrin, cyhalothrin, cyfluthrin, cypermethr

Date published: April 29, 2020

SmeltCam sampling in San Joaquin River and False River near Jersey Island in the Sacramento-San Joaquin River Delta, California, 2016

This dataset includes field data for fishes sampled using mid-water trawls and the SmeltCam during daylight hours in the Sacramento- San Joaquin Delta, California. Sampling took place between February 8, 2016 and March 1, 2016. This data release includes all measured environmental parameters and fish taxa collected during sampling event.

Date published: April 28, 2020

Otolith chemistry of fishes in Rodeo Lagoon, Marin County, California, 2016

The dataset includes multiple file types (CSV, ArcGIS shapefiles, and images), data relates to the elemental analysis of fish otoliths. Otoliths examined in this study were from randomly-sampled individual Tidewater Goby (Eucyclogobius newberryi) and Prickly Sculpin (Cottus asper) from the adult population of Rodeo Lagoon and Rodeo Creek, Marin County, California. The fish w

Date published: April 23, 2020

Domestic Wells in the United States

Domestic wells provide drinking water supply for approximately 40 million people in the United States. Knowing the location of these wells, and the populations they serve, is important for identifying heavily used aquifers, locations susceptible to contamination, and populations potentially impacted by poor-quality groundwater. 

Date published: April 23, 2020

Groundwater-Quality Data in the Redding-Red Bluff Shallow Aquifer Study Unit, 2018-2019: Tables

The U.S. Geological Survey collected groundwater samples from 50 wells used for domestic and small system drinking water supplies in Shasta and Tehama Counties, California in 2018-2019. The wells were sampled for the Redding-Red Bluff Shallow Aquifer Study Unit of the California State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin P...

Date published: April 23, 2020

2019 Santa Ana Reach Location Information

This dataset includes the 2019 latitude and longitude information for habitat and fish reach locations on the Santa Ana River.

Date published: April 23, 2020

Boundaries and Grid Cells of the Redding-Red Bluff Shallow Aquifer Study Unit, 2018-2019

The U.S. Geological Survey collected groundwater samples from 50 wells used for domestic and small-system drinking water supplies in Shasta and Tehama Counties, California in 2018-2019. The wells were sampled for the Redding-Red Bluff Shallow Aquifer study unit of the California State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin P...

Date published: April 23, 2020

SAR 2018 San Gabriel Reach Fish Data

This dataset contains the 2018 reach fish data for the Santa Ana Sucker (Catostomus santaanae) and the Arroyo Chub (Gila orcutti) in the San Gabriel River.

Date published: April 23, 2020

SAR 2018 SAR and SGR_Latitude_Longitude Data

This dataset includes the 2018 latitude and longitude information for habitat and fish reach locations on the Santa Ana and San Gabriel Rivers.

Date published: April 23, 2020

SAR 2018 Santa Ana River Reach Fish Data

This dataset contains the 2018 reach fish data for the Santa Ana Sucker (Catostomus santaanae) and the Arroyo Chub (Gila orcutti) in the Santa Ana River, California.

Date published: April 23, 2020

Groundwater-quality data in the Redding-Red Bluff Shallow Aquifer Study Unit, 2018-2019: Results from the California GAMA Priority Basin Project

The U.S. Geological Survey collected groundwater samples from 50 wells used for domestic and small system drinking water supplies in Shasta and Tehama Counties, California in 2018-2019. The wells were sampled for the Redding-Red Bluff Shallow Aquifer Study Unit of the California State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin P...

Date published: April 23, 2020

2019 Santa Ana Reach Habitat Data

This dataset includes 2019 reach habitat data for the Santa Ana Sucker (Catostomus santaanae) and the Arroyo Chub (Gila orcutti) in the Santa Ana River.

Filter Total Items: 1,043
People stand on the deck of a ship while guiding a large seafloor coring device off the stern, mountains in background.
October 12, 2019

Rossfelder P-5 Vibracorer

USGS science crew from Pacific Coastal and Marine Science Center work together to get the vibracorer coring device in position to collect sediment core samples off San Francisco, California.

View from the stern of a ship with a large A-frame boom with pullies and ropes attached to a coring device sitting on deck.
October 11, 2019

Vibracorer on deck in San Francisco

The USGS uses the Rossfelder P-5 vibracorer to collect deep-water sediment samples from the seafloor. Here, they are heading out offshore of San Francisco with the Golden Gate Bridge in the background.

October 10, 2019

October 17, 1989 (Part 1)

On October 17, 1989, at 5:04 pm a magnitude M6.9 earthquake struck near Loma Prieta, California. It was a tragic reminder of the destructive power of earthquakes. However, it was also a watershed moment in seismic research. 30 years later, we revisit the earthquake through the eyes of the scientists who experienced it. And studied it. These are their stories. In Part 1 (of

October 10, 2019

October 17, 1989 (Part 2)

On October 17, 1989, at 5:04 pm a magnitude M6.9 earthquake struck near Loma Prieta, California. It was a tragic reminder of the destructive power of earthquakes. However, it was also a watershed moment in seismic research. 30 years later, we revisit the earthquake through the eyes of the scientists who experienced it. And studied it. These are their stories. In Part 2 (of

October 10, 2019

October 17, 1989 (Part 3)

On October 17, 1989, at 5:04 pm a magnitude M6.9 earthquake struck near Loma Prieta, California. It was a tragic reminder of the destructive power of earthquakes. However, it was also a watershed moment in seismic research. 30 years later, we revisit the earthquake through the eyes of the scientists who experienced it. And studied it. These are their stories. In Part 3 (of

October 10, 2019

October 17, 1989 (Part 4)

On October 17, 1989, at 5:04 pm a magnitude M6.9 earthquake struck near Loma Prieta, California. It was a tragic reminder of the destructive power of earthquakes. However, it was also a watershed moment in seismic research. 30 years later, we revisit the earthquake through the eyes of the scientists who experienced it. And studied it. These are their stories. In Part 4 (of

October 10, 2019

PubTalk 10/2019 — Remembering Loma Prieta Earthquake 30 Years Later

Remembering the Loma Prieta Earthquake 30 Years Late: Looking back to see how far we've come.
By: Tom Holzer, David Schwartz, Jessica Murray, and Annemarie Baltay

  • The Loma Prieta earthquake ended decades of seismic tranquility in the Bay Area - Is the earthquake threat in the Bay Area real and imminent?
  • Up to $80 billion in earthquake mitigation
Four people stand around a coring device on the deck of a ship.
October 5, 2019

Removal of sediment-filled core liner

USGS scientists Brandon Nasr, Jenna Hill, Nora Nieminski, and Jenny McKee removing a sediment-filled core liner from the jumbo piston core barrel with the picturesque northern California coastline in the background.

A group of people help guide a yellow instrument, suspended from a cabling system, off a boat and into the ocean.
October 2, 2019

Lowering Chirp from R/V Bold Horizon

The crew of research vessel Bold Horizon with USGS science crew prepare to launch the Chirp sub-bottom profiler off the west coast near northern California and southern Oregon.

Photo looks at the very end of a metal coring device with mud in it, sitting on the deck of a ship in its metal launch.
October 1, 2019

Jumbo piston corer with mud from the seafloor

After recovery, the jumbo piston corer sits on the deck of research vessel Bold Horizon in its launch and recovery system. This muddy collar is removed to reveal the removable length of the core, which sits within a stiff plastic tube inside the metal tube.

September 30, 2019

Prototype Earthquake Early Warning System (Interview)

Retired seismologist David Oppenheimer reflects on the first prototype earthquake early warning system used during the 1989 Loma Prieta earthquake. Scientists deployed an analog system to notify first responders of impending earthquake activity as they worked on rescue efforts at the Cypress Viaduct collapse in Oakland, CA.
 

A small device sits on a tripod which rests on a square tarp pinned down on a flat area of grass.
September 30, 2019

GPS target

A global positioning system (GPS) sits on a tripod and is used to accurately pinpoint the center of a target that itself is used for photo rectification with aerial photos. 

Filter Total Items: 940
research boat on delta
March 15, 2019

Earlier this month, over 40 scientists from the California Water Science Center attended the 2019 Interagency Ecological Program (IEP) Workshop in Folsom, California. 

Flooding in California
March 13, 2019

New U.S. Geological Survey-led coastal modeling research presents state, federal, and commercial entities with varying storm and sea level-rise scenarios to assist with planning for future infrastructure and mitigation needs along the California coast. 

View of the Mono Lake-Long Valley volcanic region
March 7, 2019

The Mono Craters, a line of volcanic domes and craters south of Mono Lake in eastern California, represent the youngest rhyolitic volcanoes in the western United States.

Application window with parameter settings down the left, map showing results of parameter settings, and legend on right.
March 1, 2019

Oceanographer Juliette Finzi Hart of the USGS Pacific Coastal and Marine Science Center was invited by the California Department of Transportation (Caltrans) to provide an overview of the USGS Coastal Storm Modeling System (CoSMoS) at the 2019 California Transportation Planning Conference in San Diego.

Three illustrations to show location of a study site, each labeled with distinctive areas, where there are high coastal cliffs.
March 1, 2019

On Monday, February 25, 2019, research geologist Jonathan Warrick of the USGS Pacific Coastal and Marine Science Center spoke with ABC7 News about a February 22 landslide that injured one woman and buried another at San Francisco’s Fort Funston beach.

Infographic about the 2019 report "California's Exposure to Volcanic Hazards"
February 25, 2019

The potential for damaging earthquakes, landslides, floods, tsunamis, and wildfires is widely recognized in California.

USGS
February 14, 2019

Great Lakes Phragmites programs served as a case study for the Delta Stewardship Council

USGS Director Jim Reilly being given a tour of the CalVO Ops room by Emily Montgomery-Brown
February 7, 2019

During a tour of western USGS offices, Director James F. Reilly II visited the CalVO offices and operations center in Menlo Park, CA.

A picture of a river in the neonicotionoid insecticide study
January 14, 2019

This month California Water Science Center Scientist Dr. Michelle Hladik and others published an article on water treatment processes and their effects on neonicotinoid pesticides and the potential health threats they pose.

Underwater photo of a rocky outcrop with many multicolored corals growing on it.
November 29, 2018

Researchers from the USGS Pacific Coastal and Marine Science Center (PCMSC) participated in a research cruise to survey deep-water coral, sponge, and fish habitats off U.S. West Coast.

Filter Total Items: 232