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: 416
Date published: November 6, 2018
Status: Active

San Antonio Reservoir Bathymetric Survey and Sedimentation Study

Over time, the flow of water into the San Antonio Reservoir has caused the build-up of sediment, decreasing storage capacity. Since water storage is a crucial issue in California, up-to-date information on the reservoir is needed.  To accomplish this, the San Francisco Public Utilities Commission approached the USGS California Water Science Center to conduct a bathymetric (depth) survey and...

Date published: November 5, 2018
Status: Completed

USGS ground- and boat-based support for the NASA airSWOT mission on the Sacramento River, California

This field work on the Sacramento River will be performed at two scales: a coarse-scale sampling from Keswick Dam to the I-5 Bridge near the city of Sacramento using Hobo stage recorders at approximately 10 – 20 km spacing; and fine-scale surveys in two reaches, one from approximately 30 km upstream and downstream of Colusa and another 30 km reach downstream of Knight’s Landing using Hobo...

Contacts: Justin Minear
Date published: November 5, 2018
Status: Completed

Development of Precipitation-Runoff Modeling System (PRMS) for the Kings River Basin, California, with application for streamflow predictability and flood forecasting

his study will provide an analysis tool for forecasting seasonal and longer term streamflow variations, and for evaluating climate and land cover variations in the Kings River Basin. This study will directly or indirectly address several water-resource issues identified in the USGS Science Strategy document (USGS, 2007): drinking water availability, the suitability of aquatic habitat for biota...

Contacts: Kathryn Koczot
Date published: November 5, 2018
Status: Completed

Nitrogen Dynamics Along the Sacramento River and Links to Phytoplankton Dynamics: Resolving Spatial and Temporal Variability Using In-Situ, High-Frequency Measurements and Other Tools

The overall project objective is to further our understanding of the link between nitrogen and phytoplankton dynamics in the Sacramento River and to elucidate effects of wastewater treatment plant effluent on food web dynamics.

Contacts: Tamara Kraus
Date published: November 5, 2018
Status: Completed

Development of unimpaired flows for mountain basins draining to the Bay Delta

The objective of this study is to develop daily historical climate surfaces and simulate unimpaired basin discharge, including surface water flow and baseflow, from all basins that drain to the Bay Delta. Basin drainage will be calibrated to DWR reconstructed flows, and comparisons of results will be made with other independently developed watershed models for basins in which they coincide. A...

Date published: November 5, 2018
Status: Completed

Bay Area Ensemble Modeling for Conservation and Biodiversity

The objective of this study is to provide downscaled ensemble projections of climate and hydrology for the next century for the state of California with specific application to the San Francisco Bay Area.

Date published: November 5, 2018
Status: Completed

Delta-Mendota Canal: Evaluation of Groundwater Conditions and Land Subsidence

In areas adjacent to the Delta-Mendota Canal (DMC), extensive groundwater withdrawal from the San Joaquin Valley aquifer system has caused areas of the ground to sink as much as 10 feet, a process known as land subsidence. This could...

Date published: November 5, 2018
Status: Completed

Land Subsidence Along the California Aqueduct

Subsidence is a global problem and, in the United States, more than 17,000 square miles in 45 States, an area roughly the size of New Hampshire and Vermont combined, have been directly affected by subsidence. More than 80 percent of the identified subsidence in the United States is a consequence of human impact on subsurface water.

Contacts: Michelle Sneed
Date published: November 1, 2018
Status: Completed

Interactions Between Physical Processes and Suspended Sediment Quality in Relation to Spawning Migrations of Delta Smelt

The proposed study is designed to better establish relationships between patterns of delta smelt abundance and properties of suspended particles as measured by optical and acoustical techniques.

Date published: October 31, 2018
Status: Active

Causes and Relevance of Phytoplankton Blooms in the Northern Sacramento-San Joaquin Delta

Phytoplankton are an important part of aquatic food webs and ecosystems. These single-celled plants grow faster in the stronger light of spring or summer, resulting in population explosions called phytoplankton blooms. These blooms in turn feed zooplankton (free-floating aquatic microorganisms), providing food for many aquatic species, including fish, shrimp, crabs, and other invertebrates....

Date published: October 31, 2018
Status: Active

Improved Lower South Bay suspended-sediment flux measurements

Tidal marshes provide animal habitats and prevent erosion. Expanding towns and cities have claimed major parts of San Francisco Bay’s marshland. Sediment deposits are essential to rebuilding tidal marshes and keeping existing marshes intact. In the southern part of the Bay, the largest tidal wetland restoration project on the west coast is underway. Sediment flux measurements are key in...

Date published: October 30, 2018
Status: Active

The influence of preferential flow on water and solute fluxes in the unsaturated zone- John Nimmo

Much unsaturated-zone water moves not as typically slow diffuse flow, but rapidly through preferential flow channels such as root holes and fractures. Impacts are profound and far-reaching for issues such as contaminant transport, ecohydrology, and aquifer recharge. Understanding is limited and accepted theory is lacking, making preferential flow a crucial and exciting area of earth science....

Filter Total Items: 550
Date published: January 1, 2019

Abundance and Distribution of Fishes in the Northern Sacramento-San Joaquin Delta, California, 2017-2018 (ver. 1.1, December 2019)

This dataset includes field data for fishes sampled using gill nets during daylight hours in the Northern Sacramento-San Joaquin Delta, California, USA. This data release includes all measured environmental parameters and fish taxa included in the analysis. First posted - August 19, 2019 (available from author) Revised - December 18, 2019 (version 1.1)

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 flood depth and duration projections: 20-year storm in Santa Barbara County

This data contains maximum depth of flooding (cm) in the region landward of the present-day shoreline for the sea-level rise (SLR) 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 erosion for both current and future sea-le

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 flood depth and duration projections: 100-year storm in San Mateo County

This data contains maximum depth of flooding (cm) in the region landward of the present-day shoreline for the sea-level rise (SLR) 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 erosion for both current and future sea-le

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 flood depth and duration projections: 100-year storm in Santa Barbara County

This data contains maximum depth of flooding (cm) in the region landward of the present-day shoreline for the sea-level rise (SLR) 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 erosion for both current and future sea-le

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 wave-hazard projections: 1-year storm in San Mateo County

This data contains maximum model-derived significant wave height (in meters) for the sea-level rise (SLR) 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 erosion for both current and future sea-level rise (SLR) scenar

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 ocean-currents projections: average conditions in San Luis Obispo County

This data contains maximum model-derived ocean currents (in meters per second) for the sea-level rise (SLR) 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 erosion for both current and future sea-level rise (SLR) scen

Date published: January 1, 2019

Geological, geochemical, and geophysical data from the Lost Hills and Belridge oil fields (ver. 2.0, Sept 2019)

The U.S. Geological Survey (USGS) in cooperation with the California State Water Resources Control Board compiled and analyzed data for mapping groundwater salinity and characterizing aquifer systems in and near selected oil and gas fields in California. Data for the Lost Hills, North Belridge, and South Belridge oil fields include production and injection volumes, oil show data, form

Date published: January 1, 2019

Groundwater-Quality Data in the Mojave Basin Shallow Aquifer Study Unit, 2018: Results from the California GAMA Priority Basin Project

The U.S. Geological Survey collected groundwater samples from 49 wells used for domestic and small system drinking water supplies and 10 monitoring wells in San Bernardino County, California in 2018. The wells were sampled for the Mojave Basin (MOBS) Shallow Aquifer Study Unit of the California State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) Prog

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 flood-hazard projections: average conditions in San Francisco County

This data contains geographic extents of projected coastal flooding, low-lying vulnerable areas, and maximum/minimum flood potential (flood uncertainty) associated with the sea-level rise (SLR) and storm condition indicated.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-ind

Date published: January 1, 2019

Structure-from-motion point cloud of Mud Creek, Big Sur, California, 2017-06-26

Presented here is a point cloud collected by the U.S. Geological Survey (USGS) using an oblique plane-mounted camera system, covering the area of the Mud Creek landslide on California State Route 1 (SR1), Mud Creek, Big Sur, California. The point cloud is referenced to previously published lidar data and contains RGB information as well as XYZ. Point cloud coordinates are in NAD83

Date published: January 1, 2019

Water quality and ancillary data for assessment of uranium concentrations in groundwater, San Joaquin Valley, CA (ver. 1.1, December, 2019)

High concentrations of uranium were detected in samples from wells used for domestic drinking water supplies in the San Joaquin Valley. Of 163 domestic wells sampled by the California Groundwater Ambient Monitoring and Assessment Program Priority Basin Project (GAMA-PBP) and the National Water Quality Program (NWQP) in 2008-2015, 26 percent had uranium concentrations greater than the U.

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 wave-hazard projections: average conditions in Santa Barbara County

This data contains maximum model-derived significant wave height (in meters) for the sea-level rise (SLR) 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 erosion for both current and future sea-level rise (SLR) scenar

Filter Total Items: 416
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Year Published: 2010

Correction to “Constraints on the stress state of the San Andreas Fault with analysis based on core and cuttings from San Andreas Fault Observatory at Depth (SAFOD) drilling phases 1 and 2”

This article corrects: Constraints on the stress state of the San Andreas Fault with analysis based on core and cuttings from San Andreas Fault Observatory at Depth (SAFOD) drilling phases 1 and 2. Vol. 114, Issue B11, Article first published online: 5 NOV 2009.

Tembe, Sheryl; Lockner, David; Wong, Teng-Fong
Correction to “Constraints on the stress state of the San Andreas Fault with analysis based on core and cuttings from San Andreas Fault Observatory at Depth (SAFOD) drilling phases 1 and 2”; 2010; Article; Journal; Journal of Geophysical Research: Solid Earth; Tembe, Sheryl ; Lockner, David ; Wong, Teng-fong

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Year Published: 2010

Evaluation of geodetic and geologic datasets in the Northern Walker Lane-Summary and recommendations of the Workshop

The Northern Walker Lane comprises a complex network of active faults in northwestern Nevada and northeastern California bound on the west by the Sierra Nevada and on the east by the extensional Basin and Range Province. Because deformation is distributed across sets of discontinuous faults, it is particularly challenging to integrate geologic and...

Briggs, Richard W.; Hammond, William C.
Evaluation of geodetic and geologic datasets in the Northern Walker Lane-Summary and recommendations of the Workshop; 2010; OFR; 2011-1282; Briggs, Richard W.; Hammond, William C.

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Year Published: 2010

Recently active traces of the Bartlett Springs Fault, California: A digital database

The purpose of this map is to show the location of and evidence for recent movement on active fault traces within the Bartlett Springs Fault Zone, California. The location and recency of the mapped traces is primarily based on geomorphic expression of the fault as interpreted from large-scale aerial photography. In a few places, evidence of fault...

Lienkaemper, James J.
Recently active traces of the Bartlett Springs Fault, California: a digital database; 2010; DS; 541; Lienkaemper, James J.

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Year Published: 2010

Estuarine sedimentation, sediment character, and foraminiferal distribution in central San Francisco Bay, California

Central San Francisco Bay is the deepest subembayment in the San Francisco Bay estuary and hence has the largest water volume of any of the subembayments. It also has the strongest tidal currents and the coarsest sediment within the estuary. Tidal currents are strongest over the west-central part of central bay and, correspondingly, this area is...

Chin, John L.; Woodrow, Donald L.; McGann, Mary; Wong, Florence L.; Fregoso, Theresa A.; Jaffe, Bruce E.
Estuarine sedimentation, sediment character, and foraminiferal distribution in central San Francisco Bay, California; 2010; OFR; 2010-1130; Chin, John L.; Woodrow, Donald L.; McGann, Mary; Wong, Florence L.; Fregoso, Theresa; Jaffe, Bruce E.

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Year Published: 2010

Emergency assessments of postfire debris-flow hazards for the 2009 La Brea, Jesusita, Guiberson, Morris, Sheep, Oak Glen, Pendleton, and Cottonwood fires in southern California

This report presents an emergency assessment of potential debris-flow hazards from basins burned by the 2009 La Brea and Jesusita fires in Santa Barbara County, the Guiberson fire in Ventura County, the Morris fire in Los Angeles County, the Sheep, Oak Glen, and Pendleton fires in San Bernardino County, and the Cottonwood fire in Riverside County...

Cannon, Susan H.; Gartner, Joseph E.; Rupert, Michael G.; Michael, John A.
Emergency assessments of postfire debris-flow hazards for the 2009 La Brea, Jesusita, Guiberson, Morris, Sheep, Oak Glen, Pendleton, and Cottonwood fires in southern California; 2010; OFR; 2010-1186; Cannon, Susan H.; Gartner, Joseph E.; Rupert, Michael G.; Michael, John A.

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Year Published: 2010

The 2007 M5.4 Alum Rock, California, earthquake: Implications for future earthquakes on the central and southern Calaveras Fault

[1] The similarity of seismograms recorded by two seismic stations demonstrate that the 31 October 2007 moment magnitude M5.4 Alum Rock earthquake is a repeat of a 1955 ML5.5 earthquake. Both occurred on Oppenheimer et al.'s (1990) Zone V “stuck patch” on the central Calaveras fault, providing new support for their model of...

Oppenheimer, David H.; Bakun, William H.; Parsons, Tom; Simpson, Robert W.; Boatwright, John; Uhrhammer, R. A.

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Year Published: 2010

Reconnaissance geologic map of the Hyampom 15' quadrangle, Trinity County, California

The Hyampom 15' quadrangle lies west of the Hayfork 15' quadrangle in the southern part of the Klamath Mountains geologic province of northern California. It spans parts of four generally northwest-trending tectono- stratigraphic terranes of the Klamath Mountains, the Eastern Hayfork, Western Hayfork, Rattlesnake Creek, and Western Jurassic...

Irwin, William P.
Reconnaissance geologic map of the Hyampom 15' quadrangle, Trinity County, California; 2010; SIM; 3129; Irwin, William P.

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Year Published: 2010

Reconnaissance Geologic Map of the Hayfork 15' Quadrangle, Trinity County, California

The Hayfork 15' quadrangle is located just west of the Weaverville 15' quadrangle in the southern part of the Klamath Mountains geologic province of northern California. It spans parts of six generally north-northwest-trending tectonostratigraphic terranes that are, from east to west, the Eastern Klamath, Central Metamorphic, North Fork, Eastern...

Irwin, William P.
Reconnaissance Geologic Map of the Hayfork 15' Quadrangle, Trinity County, California; 2010; SIM; 3119; Irwin, William P.

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Year Published: 2010

Final Report: Baseline Selenium Monitoring of Agricultural Drains Operated by the Imperial Irrigation District in the Salton Sea Basin, California

This report summarizes comprehensive findings from a 4-year-long field investigation to document baseline environmental conditions in 29 agricultural drains and ponds operated by the Imperial Irrigation District along the southern border of the Salton Sea. Routine water-quality collections and fish community assessments were conducted on as many...

Saiki, Michael K.; Martin, Barbara A.; May, Thomas W.
Final Report: Baseline Selenium Monitoring of Agricultural Drains Operated by the Imperial Irrigation District in the Salton Sea Basin, California ; 2010; OFR; 2010-1064; Saiki, Michael K.; Martin, Barbara A.; May, Thomas W.

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Year Published: 2010

Relations Between Rainfall and Postfire Debris-Flow and Flood Magnitudes for Emergency-Response Planning, San Gabriel Mountains, Southern California

Following wildfires, emergency-response and public-safety agencies are faced often with making evacuation decisions and deploying resources both well in advance of each coming winter storm and during storms themselves. Information critical to this process is provided for recently burned areas in the San Gabriel Mountains of southern California....

Cannon, Susan H.; Boldt, Eric M.; Kean, Jason W.; Laber, Jayme; Staley, Dennis M.
Relations Between Rainfall and Postfire Debris-Flow and Flood Magnitudes for Emergency-Response Planning, San Gabriel Mountains, Southern California; 2010; OFR; 2010-1039; Cannon, Susan H.; Boldt, Eric M.; Kean, Jason W.; Laber, Jayme; Staley, Dennis M.

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Year Published: 2009

Data from theodolite measurements of creep rates on San Francisco Bay region faults, California, 1979-2012

IntroductionOur purpose is to annually update our creep-data archive on San Francisco Bay region active faults for use by the scientific research community. Earlier data (1979-2001) were reported in Galehouse (2002) and were analyzed and described in detail in a summary report (Galehouse and Lienkaemper, 2003). A complete analysis of our earlier...

McFarland, Forrest S.; Lienkaemper, James J.; Caskey, S. John
McFarland, F.S., Lienkaemper, J.J., and Caskey, S.J., 2016, Data from theodolite measurements of creep rates on San Francisco Bay Region faults, California (ver. 1.8, March 2016): U.S. Geological Survey Open-File Report 2009–1119, 21 p. and data files, https://doi.org/10.3133/ofr20091119.

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Year Published: 2009

Total selenium in irrigation drain inflows to the Salton Sea, California, April 2009

This report presents the results for the final sampling period (April 2009) of a 4-year monitoring program to characterize selenium concentrations in selected irrigation drains flowing into the Salton Sea, California. Total selenium and total suspended solids were determined in water samples. Total selenium, percent total organic carbon, and...

May, Thomas W.; Walther, Michael J.; Saiki, Michael K.; Brumbaugh, William G.
Total Selenium in Irrigation Drain Inflows to the Salton Sea, California, April 2009; 2009; OFR; 2009-1230; May, Thomas W.; Walther, Michael J.; Saiki, Michael K.; Brumbaugh, William G.

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November 29, 2018

PubTalk 11/2018 - California Birds

Title: The Least Bell's Vireo - A flagship species for riparian ecosystem conservation

The Least Bell's Vireo (Vireo bellii pusillus) is a songbird that is endangered in California:

  • What type of research is the USGS doing to help understand the threats these and other birds face?
  • How has our research during the last 30 years
Researcher in Mojave Desert
November 29, 2018

Researcher in Mojave Desert

One of 1,695 repeat photographs taken to provide context for the classification of the Central Mojave Desert into various vegetation classes.

Snow falls on USGS Hydrologist, Joe Nawikas, as he collects groundwater samples in Mammoth, California.
November 28, 2018

Collecting Groundwater Samples in Mammoth, CA

Snow falls on USGS Hydrologist, Joe Nawikas, as he collects groundwater samples in Mammoth, California.

November 16, 2018

Image of the Week - California Wildfires

Satellites have captured views of the numerous major fires burning in California.

An image acquired on November 9, 2018, from NASA’s MODIS sensor on the Terra satellite shows smoke pouring out of two major fires, the Camp Fire and the Woolsey Fire, which both ignited the day before.

In the north, the Camp Fire quickly became the deadliest wildfire in the

Scientist writing on clipboard, with small seismometer on the ground and mountains in the background
November 16, 2018

Collecting geophysics data at Pinnacles National Park

Research Hydrologist Paul Hsieh collects seismic data during a groundwater study at Pinnacles National Park in California. The red seismometer on the ground measures ambient seismic noise, which includes microtremors induced by wind, ocean waves, and human activity. The seismic data collected can be used to estimate unconsolidated sediment thickness, map the bedrock

...
Attribution: Water Resources
Image from an application that navigates users through USGS National Oil and Gas Assessment Provinces
November 14, 2018

National Oil and Gas Assessment Provinces

This is a graphic from the USGS National Oil and Gas Assessment Explorer application, which allows user to drill into 70 oil and gas assessment provinces throughout the United States.

Dark image of a coastal area shows standard deviation of pixel density for 10 minutes, brighter areas mean more movement.
November 8, 2018

Sunset State Beach variance image

Image from video camera along Sunset State Beach in Watsonville, CA, looking northwest. Every half hour during daylight hours, the camera shoots video for 10 minutes. This variance image shows the standard deviation of pixel intensity throughout the video frames, useful for determining how much variation or movement is occurring at a given location. Brighter tones indicate

...
Satellite picture showing the Woolsey fire in California
November 8, 2018

Fires Burning Across California

Satellites have captured views of the numerous major fires burning in California.

View of the underside of an airplane wing with a sunset over the ocean, with islands, in the background.
November 1, 2018

Channel Islands National Park from an aerial photographic survey

View of Channel Islands National Park from a Fall 2018 aerial photographic survey.

The Seabird Studies Team at the USGS Western Ecological Research Center is conducting aerial photographic surveys of the ocean off central and southern California to create comprehensive maps of seabird and marine mammal distributions.

October 31, 2018

Drone Footage of Whiskeytown National Recreation Area after Carr Fire

Drone footage of Whiskeytown National Recreation area in Northern California in October 2018, captured by drone pilot and USGS WERC ecologist Chase Freeman.

USGS WERC is using drone imagery to understand how the 2018 Carr Fire affected ecosystems and cultural resources. The study, a collaboration with the National Park Service (NPS), focuses on Whiskeytown National

October 25, 2018

PubTalk 10/2018 — Post-fire debris flow early warning

Title: Post-Fire Debris-Flow Early Warning: The case for forecast-based warning systems

  • Post-fire debris flows can initiate after only a few minutes of intense rain, and during the first storm following wildfire.
  • Early warning systems must provide sufficient time to make informed decisions and take reasonable preventative action.
  • If you're
Pacific fisher on a tree looking into a bait box
October 24, 2018

Pacific fisher trying to grab a chicken dinner from the bait box

USGS scientists are documenting the distribution of three mid-sized mammalian carnivores – or mesocarnivores –in the Klamath Network Parks using remote cameras and hair snares. Little is known about the status of Pacific fishers, Pacific martens, and Sierra Nevada red foxes living in the Klamath Network, which include Crater Lake National Park, Lassen Volcanic National

...
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Irrigation ditch alongside an agricultural field.
May 18, 2016

If past patterns of California land-use change continue, projected water needs by the year 2062 will increase beyond current supply.

Image shows gold-bearing veins of quartz
May 6, 2016

Happy Mother's Day from EarthWords!

USGS science for a changing world
May 4, 2016

Elevated levels of trace metals such as iron, lead, nickel and zinc were found in streams of the San Gabriel Mountains north of Los Angeles, California, at water-quality levels higher than the Environmental Protection Agency’s Aquatic Life Ambient Water Quality Criteria, according to a new U.S. Geological Survey study. 

Earth Day 2016 — USGS Graphic
April 21, 2016

Celebrate Earth Day on April 22! Learn about USGS science for a changing world.

USGS
April 11, 2016

Methane emissions from restored wetlands may offset the benefits of carbon sequestration a new study from the U.S. Geological Survey suggests. 

Earthquake preparedness flyer explaining what to do before, during and after an earthquake.
April 11, 2016

The U.S. Geological Survey (USGS) and Clear Channel Outdoor Americas (CCOA) today announced a new campaign to provide Southern Californians with critical earthquake preparedness information.

Shaded relief image of the Santa Rosa area showing active faults
April 4, 2016

For the first time, scientists at the U.S. Geological Survey have mapped the active surface trace of the Rodgers Creek Fault through the central part of the northern California city of Santa Rosa. Urban development has, until now, obscured its exact location.

Bathymetry of Monterey Canyon and the Soquel Canyon tributary
March 29, 2016

Six new sets of maps reveal the diverse and complex range of seafloor habitats along 130 kilometers (80 miles) of the central California coast from the Monterey Peninsula north to Pigeon Point. The publicly available maps can be used by a large stakeholder community to understand and manage California’s vast and valuable marine resources. 

Image: Scientists Collect Data on Yosemite Rock Erosion
March 28, 2016

After more than three years of monitoring the towering granite cliffs of Yosemite National Park, scientists have new insights into a potentially important mechanism that can trigger rockfalls in the park. Although many conditions can trigger rockfalls, some rockfalls are more likely to happen in the hottest part of the day, during the hottest part of the year.

This is a photo of Ubehebe Crater.
March 25, 2016

New research by scientists at CalVO indicates that Ubehebe Craters formed about 2100 years ago during a single eruptive event. Ubehebe Craters are a lone cluster of volcanic craters in the northern half of California's Death Valley National Park.

Picture of a ground water display
March 25, 2016

California Water Science Center scientist teach water quality issues to Orange County students

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