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: 377
Date published: December 19, 2018
Status: Completed

Evaluation of the groundwater resources of the Petaluma Valley

The city of Petaluma, located in the Petaluma Valley and home to about 12 percent of the population of Sonoma County, faces growth in population and demand for water. Water supply is provided primarily by water delivered via aqueduct from the Russian River; however, groundwater is a vital supplemental source of water for the city of Petaluma and is the primary source of supply for domestic and...

Contacts: Tracy Nishikawa
Date published: December 19, 2018
Status: Completed

Development of a spatially explicit ecosystem model to explore physiochemical drivers of step changes in POD species abundance and distribution in the Sacramento-San Joaquin Delta and Suisun Bay

Prior to 2000, the four most abundant resident pelagic fishes in the study area included two native species, delta smelt (Hypomesus transpacificus) a federal listed endangered species, and longfin smelt (Spirinchus thaleicthys) a state listed endangered species, and two introduced species, threadfin shad (Dorosoma petenense) and age-0 striped bass (Morone saxatilis). 

Contacts: Larry Brown
Date published: December 19, 2018
Status: Completed

Evaluation of Exposure and Vulnerability of Selected Inland National Wildlife Refuges in the Pacific Southwest to Water Resources Constraints in the Face of Climate Change using Downscaled Climate Change Modeling

As competition for water is growing, a major challenge is to ensure that sufficient quantities of good quality water are available for fish, wildlife, and plants. Competition for a limited supply of water with adequate water quality to support National Wildlife Refuges are a dominant threat for many National Wildlife Refuges across the U.S. and is only heightened during times of drought and in...

Date published: December 19, 2018
Status: Active

Add-on to: Determination of Mercury Loads for Cache Creek Settling Basin Inflow and Outflows and Related Investigations

The California Department of Water Resources (DWR) is responsible for the operation and maintenance of the Cache Creek Settling Basin (CCSB) in Yolo County.

Date published: December 19, 2018
Status: Completed

Depth-dependent Sample Collection for Perchlorate Isotopes

Chlorine and oxygen isotopic analyses of perchlorate have shown that perchlorate from agricultural and industrial (synthetic) sources is present in the Bunker Hill Groundwater Basin downgradient of the former Lockheed Propulsion Company (LPC) Site near Redlands, Calif., about 60 miles east of Los Angeles. Although agricultural and synthetic plumes merge in the central portion of the Bunker...

Contacts: John Izbicki
Date published: December 19, 2018
Status: Completed

Quantification of Mercury Flux in Eroding Mining Debris, Yuba River Watershed, California

At two priority locations on BLM-administered land in the Yuba River watershed, the USGS has documented relatively rapid erosion of river bank material that consists of mercury (Hg)-laden sediment with a significant component of mining debris. 

Date published: December 19, 2018
Status: Completed

Shallow Aquifer Assessment Study for the Monterey Bay and Salinas Valley

High nitrate and trace element concentrations in groundwater represent a health threat to domestic well users. The concentrations and distributions of these constituents in shallow groundwater in the Salinas Valley of the central coast of California are poorly understood, and communities are concerned about the quality of their drinking water. 

Date published: December 19, 2018
Status: Completed

Relation of Groundwater Age to Herbicide Concentration Trends in Fresno and Tulare Counties, California

The California Department of Pesticide Regulation (DPR) has been monitoring pesticide concentrations in about 70 domestic drinking water wells located in vulnerable areas of Fresno and Tulare Counties for approximately 15 years. A recent analysis of the monitoring data indicated that there were decreases in simazine, diuron, and bromacil concentrations in many wells during 2000-2010.

Date published: December 19, 2018
Status: Completed

Determining Water Availability in the Russian River Watershed

The Russian River Watershed covers 1,500 square miles of urban, agricultural and forested lands in northern Sonoma County and southern Mendocino County, California. Communities in the Russian River Watershed (RRW) depend on a combination of Russian River water and groundwater to meet their water-supply demands. Water is used primarily for agricultural irrigation, municipal and private wells...

Contacts: Tracy Nishikawa
Date published: December 18, 2018
Status: Active

Water-Level, Water-Quality and Land-Subsidence Studies in the Mojave River and Morongo Groundwater Basins

Groundwater has been the primary source of domestic, agricultural, and municipal water supplies in the southwestern Mojave Desert, California, since the early 1900s. The population of the Mojave River and Morongo groundwater basins has grown rapidly during the last several decades, increasing from an estimated population of almost 273,000 in 1990 (...

Date published: December 18, 2018
Status: Completed

Pesticide Studies in the Sacramento/San Joaquin Delta and San Francisco Bay Estuary

The objectives of this specific study are to characterize the mixtures of current-use pesticides and pesticide degradates entering the Sacramento/San Joaquin Delta from its two main river sources over a period of 12 consecutive months. 

Contacts: James Orlando
Date published: December 17, 2018
Status: Completed

Delta sediment measurements to support numerical modeling of turbidity

The purpose of the proposed work is to collect data that will support the development, calibration, and validation of numerical models of sediment transport and turbidity in the Sacramento-San Joaquin Delta. 

Contacts: Scott A Wright
Filter Total Items: 501
Date published: November 27, 2019

Chirp seismic-reflection data from field activity L-1-06-SF collected offshore Bolinas to San Francisco, California on 2006-09-30

High-resolution Chirp seismic-reflection data were collected by the U.S. Geological Survey in September 2006 offshore San Francisco, California. Data were collected aboard the R/V Lakota, during field activity L-1-06-SF. Chirp data were collected using an EdgeTech 512 chirp subbottom profiler and recorded with a Triton SB-Logger.

Date published: November 27, 2019

Minisparker seismic-reflection data of field activity F-02-07-NC collected offshore San Mateo County, California, from 2007-03-22 to 2007-04-06

High-resolution single-channel minisparker seismic-reflection data were collected by the U.S. Geological Survey in March and April 2007 from San Francisco to San Gregorio, offshore San Mateo County, California. Data were collected aboard the R/V Fulmar, during field activity F-02-07-NC. Minisparker data were collected using a SIG 2-mille minisparker sound source combined with a single-cha

Date published: November 27, 2019

Chirp and minisparker seismic-reflection data of field activity L-1-06-SF collected offshore Bolinas to San Francisco, California from 2006-09-25 to 2006-10-03

High-resolution single-channel Chirp and minisparker seismic-reflection data were collected by the U.S. Geological Survey in September and October 2006, offshore Bolinas to San Francisco, California. Data were collected aboard the R/V Lakota, during field activity L-1-06-SF. Chirp data were collected using an EdgeTech 512 chirp subbottom system and were recorded with a Triton SB-Logger. M

Date published: November 27, 2019

Chirp seismic-reflection data of field activity F-02-07-NC collected offshore San Mateo County, California, from 2007-03-22 to 2007-04-06

High-resolution single-channel Chirp seismic-reflection data were collected by the U.S. Geological Survey in March and April 2007 from Pacifica to Half Moon Bay, offshore San Mateo County, California. Data were collected aboard the R/V Fulmar, during field activity F-02-07-NC. Chirp data were collected using an EdgeTech 512 chirp subbottom system and recorded with a Triton SB-Logger.

Date published: October 4, 2019

Dissolved Noble Gas Concentrations and Modeled Recharge Temperatures for Groundwater from Northern Sierra Nevada Foothills Shallow Aquifer Assessment Study Units, 2015-2017: Results from the California GAMA Priority Basin Project

This data release documents 155 sets of dissolved noble gas analyses (neon, argon, krypton, xenon) and 153 modeled recharge temperatures for groundwater sampled from domestic water supply wells and springs throughout the northern Sierra Nevada foothills as part of the California State Water Resources Control Board’s Groundwater Ambient Monitoring and Assessment (GAMA) Progra

Date published: October 1, 2019

Reanalysis of Selected Archived NURE-HSSR Sediment and Soil Samples from Arizona, California, Idaho, Montana, Nevada, New Mexico, and Utah

Beginning in November of 2015, the U.S. Geological Survey (USGS) undertook a project to reanalyze approximately 60,000 archived sample splits collected as part of the National Uranium Resource Evaluation (NURE) Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) project from selected areas in Arizona, California, Idaho, Montana, Nevada, New Mexico, and Utah. A s

Date published: September 26, 2019

Data for assessing the susceptibility of groundwater used for drinking water supply from selected principal aquifers of the Western United States, 2004-2018

Groundwater age distribution and susceptibility to natural and anthropogenic contaminants were assessed for selected principal aquifers of the Western United States: the Central Valley aquifer system (CVAL), the Basin and Range basin-fill aquifers (BNRF), the Rio Grande aquifer system (RIOG), the High Plains aquifer (HPAQ), the Columbia Plateau basaltic-rock aquifers (

Date published: September 12, 2019

Indian Wells Valley, California, sub-watersheds for the Basin Characterization Model

This data Set includes: 1) A shapefile of the Indian Wells Valley sub watersheds containing 9 sub-watersheds, 2) Geology shapefile of all the watersheds 3) Vegetation shapefile of all the watersheds 4) Basin Characterization Model (BCM) model output of recharge values for all the watersheds from 3 model runs (CanESM2, CCSM4, and HadGEM2-CC)

Date published: July 22, 2019

California State Waters Map Series Data Catalog: Point Sur to Point Arguello Region

Each GIS data file is listed with a brief description, a small image, and links to the metadata files and the downloadable data files. The data were compiled in ArcMap. Raster data layers are registered TIFF images and are in the UTM Zone 10 coordinate system. Line features are in shapefile format and are projected in UTM Zone 10 coordinates.

Date published: July 1, 2019

Our Coast Our Future

Our Coast, Our Future (OCOF) is a collaborative, user-driven project focused on providing California coastal resource managers and planners locally relevant, online maps and tools to help understand, visualize, and anticipate vulnerabilities to sea level rise and storms.

Date published: June 11, 2019

Attributed California Water Supply Well Completion Report Data for Selected Areas, Derived from CA WCR OSCWR Data

This Well Completion Report geospatial dataset represents an index to a subset of records available from the California Department of Water Resources' (DWR) Online System for Well Completion Reports (OSWCR). This release contains water supply well records from Amador, Calaveras, El Dorado, Nevada, Placer, Sacramento, San Bernardino, Sutter, and Yuba counties. The USGS

Filter Total Items: 351
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Year Published: 2016

Trace elements in stormflow, ash, and burned soil following the 2009 station fire in southern California

Most research on the effects of wildfires on stream water quality has focused on suspended sediment and nutrients in streams and water bodies, and relatively little research has examined the effects of wildfires on trace elements. The purpose of this study was two-fold: 1) to determine the effect of the 2009 Station Fire in the Angeles National...

Burton, Carmen A.; Hoefen, Todd M.; Plumlee, Geoffrey S.; Baumberger, Katherine L.; Backlin, Adam R.; Gallegos, Elizabeth; Fisher, Robert N.
Burton CA, Hoefen TM, Plumlee GS, Baumberger KL, Backlin AR, Gallegos E, et al. (2016) Trace Elements in Stormflow, Ash, and Burned Soil following the 2009 Station Fire in Southern California. PLoS ONE 11(5): e0153372. doi:10.1371/journal. pone.0153372

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Year Published: 2016

Seismic site characterization of an urban dedimentary basin, Livermore Valley, California: Site tesponse, basin-edge-induced surface waves, and 3D simulations

Thirty‐two accelerometers were deployed in the Livermore Valley, California, for approximately one year to study sedimentary basin effects. Many local and near‐regional earthquakes were recorded, including the 24 August 2014 Mw 6.0 Napa, California, earthquake. The resulting ground‐motion data set is used to quantify the seismic response...

Hartzell, Stephen H.; Leeds, Alena L.; Ramirez-Guzman, Leonardo; Allen, James P.; Schmitt, Robert G.

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Year Published: 2016

Construction, calibration, and validation of the RBM10 water temperature model for the Trinity River, northern California

We constructed a one-dimensional daily averaged water-temperature model to simulate Trinity River temperatures for 1980–2013. The purpose of this model is to assess effects of water-management actions on water temperature and to provide water temperature inputs for a salmon population dynamics model. Simulated meteorological data, observed...

Jones, Edward C.; Perry, Russell W.; Risley, John C.; Som, Nicholas A.; Hetrick, Nicholas J.
Jones, E.C., Perry, R.W., Risley, J.C., Som, N.A., and Hetrick, N.J., 2016, Construction, calibration, and validation of the RBM10 water temperature model for the Trinity River, northern California: U.S. Geological Survey Open-File Report 2016–1056, 46 p., http://dx.doi.org/10.3133/ofr20161056.

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Year Published: 2016

California State Waters Map Series—Offshore of Santa Cruz, California

IntroductionIn 2007, the California Ocean Protection Council initiated the California Seafloor Mapping Program (CSMP), designed to create a comprehensive seafloor map of high-resolution bathymetry, marine benthic habitats, and geology within the limit of California’s State Waters. The CSMP approach is to create highly detailed seafloor maps...

Cochrane, Guy R.; Cochran, Susan A.; Cochrane, Guy R.; Dartnell, Peter; Johnson, Samuel Y.; Erdey, Mercedes D.; Golden, Nadine E.; Greene, H. Gary; Dieter, Bryan E.; Hartwell, Stephen R.; Ritchie, Andrew C.; Finlayson, David P.; Endris, Charles A.; Watt, Janet T.; Davenport, Clifton W.; Sliter, Ray W.; Maier, Katherine L.; Krigsman, Lisa M.
Cochrane, G.R., Dartnell, P., Johnson, S.Y., Erdey, M.D., Golden, N.E., Greene, H.G., Dieter, B.E., Hartwell, S.R., Ritchie, A.C., Finlayson, D.P., Endris, C.A., Watt, J.T., Davenport, C.W., Sliter, R.W., Maier, K.L., and Krigsman, L.M. (G.R. Cochrane and S.A. Cochran, eds.), 2016, California State Waters Map Series—Offshore of Santa Cruz, California: U.S. Geological Survey Open-File Report 2016–1024, pamphlet 40 p., 10 sheets, scale 1:24,000, http://dx.doi.org/10.3133/ofr20161024.

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Year Published: 2016

California State Waters Map Series—Offshore of Aptos, California

Introduction In 2007, the California Ocean Protection Council initiated the California Seafloor Mapping Program (CSMP), designed to create a comprehensive seafloor map of high-resolution bathymetry, marine benthic habitats, and geology within California’s State Waters. The CSMP approach is to create highly detailed seafloor maps through...

Cochrane, Guy R.; Cochran, Susan A.; Cochrane, Guy R.; Johnson, Samuel Y.; Dartnell, Peter; Greene, H. Gary; Erdey, Mercedes D.; Dieter, Bryan E.; Golden, Nadine E.; Hartwell, Stephen R.; Ritchie, Andrew C.; Kvitek, Rikk G.; Maier, Katherine L.; Endris, Charles A.; Davenport, Clifton W.; Watt, Janet T.; Sliter, Ray W.; Finlayson, David P.; Krigsman, Lisa M.
Cochrane, G.R., Johnson, S.Y., Dartnell, P., Greene, H.G., Erdey, M.D., Dieter, B.E., Golden, N.E., Hartwell, S.R., Ritchie, A.C., Kvitek, R.G., Maier, K.L., Endris, C.A., Davenport, C.W., Watt, J.T., Sliter, R.W., Finlayson, D.P., and Krigsman, L.M. (G.R. Cochrane and S.A. Cochran, eds.), 2016, California State Waters Map Series—Offshore of Aptos, California: U.S. Geological Survey Open-File Report 2016–1025, pamphlet 43 p., 10 sheets, scale 1:24,000, http://dx.doi.org/10.3133/ofr20161025.

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Year Published: 2016

Water availability and land subsidence in the Central Valley, California, USA

The Central Valley in California (USA) covers about 52,000 km2 and is one of the most productive agricultural regions in the world. This agriculture relies heavily on surface-water diversions and groundwater pumpage to meet irrigation water demand. Because the valley is semi-arid and surface-water availability varies substantially,...

Faunt, Claudia C.; Sneed, Michelle; Traum, Jonathan A.; Brandt, Justin T.
Faunt, C.C., and others, 2015, Hydrogeology Journal, 10.1007/s10040-015-1339-x

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Year Published: 2016

Diel activity patterns of juvenile late fall-run Chinook salmon with implications for operation of a gated water diversion in the Sacramento–San Joaquin River Delta

In the Sacramento-San Joaquin River Delta, California, tidal forces that reverse river flows increase the proportion of water and juvenile late fall-run Chinook salmon diverted into a network of channels that were constructed to support agriculture and human consumption. This area is known as the interior delta, and it has been associated with...

Plumb, John M.; Adams, Noah S.; Perry, Russell W.; Holbrook, Christopher; Romine, Jason G.; Blake, Aaron R.; Burau, Jon R.
Plumb, J.M., N.S. Adams, R.W. Perry, C.M. Holbrook, J.G. Romine, A.R. Blake, and J.R. Burau. 2015. Diel activity patterns of juvenile late fall-run Chinook salmon with implications for operation of a gated water diversion in the Sacramento-San Joaquin River Delta. River Research and Applications. (Early View). DOI: 10.1002/rra.2885.

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Year Published: 2015

Coastal Storm Modeling System (CoSMoS)

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 SLR scenarios, as well as long-term shoreline change and cliff retreat. CoSMoS v3.0 for Southern California shows projections for future...

Barnard, Patrick; Erikson, Li; Foxgrover, Amy; Herdman, Liv; Limber, Patrick W.; O'Neill, Andrea; Vitousek, Sean
Barnard, Patrick, 2015, Coastal Storm Modeling System (CoSMoS): U.S. Geological Survey Data Release, doi:10.5066/F7T151Q4.

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Year Published: 2015

California State Waters Map Series—Offshore of Pigeon Point, California

Introduction  In 2007, the California Ocean Protection Council initiated the California Seafloor Mapping Program (CSMP), designed to create a comprehensive seafloor map of high-resolution bathymetry, marine benthic habitats, and geology within the 3-nautical-mile limit of California’s State Waters. The CSMP approach is to create highly...

Cochrane, Guy R.; Cochran, Susan A.; Cochrane, Guy R.; Watt, Janet T.; Dartnell, Peter; Greene, H. Gary; Erdey, Mercedes D.; Dieter, Bryan E.; Golden, Nadine E.; Johnson, Samuel Y.; Endris, Charles A.; Hartwell, Stephen R.; Kvitek, Rikk G.; Davenport, Clifton W.; Krigsman, Lisa M.; Ritchie, Andrew C.; Sliter, Ray W.; Finlayson, David P.; Maier, Katherine L.
Cochrane, G.R., Watt, J.T., Dartnell, P., Greene, H.G., Erdey, M.D., Dieter, B.E., Golden, N.E., Johnson, S.Y., Endris, C.A., Hartwell, S.R., Kvitek, R.G., Davenport, C.W., Krigsman, L.M., Ritchie, A.C., Sliter, R.W., Finlayson, D.P., and Maier, K.L. (G.R. Cochrane and S.A. Cochran, eds.), 2015, California State Waters Map Series—Offshore of Pigeon Point, California: U.S. Geological Survey Open-File Report 2015–1232, pamphlet 40 p., 10 sheets, scale 1:24,000, http://dx.doi.org/10.3133/ofr20151232.

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Year Published: 2015

California State Waters Map Series—Offshore of Fort Ross, California

Introduction In 2007, the California Ocean Protection Council initiated the California Seafloor Mapping Program (CSMP), designed to create a comprehensive seafloor map of high-resolution bathymetry, marine benthic habitats, and geology within the 3-nautical-mile limit of California’s State Waters. The CSMP approach is to create highly...

Johnson, Samuel Y.; Cochran, Susan A.; Johnson, Samuel Y.; Dartnell, Peter; Golden, Nadine E.; Hartwell, Stephen R.; Erdey, Mercedes D.; Greene, H. Gary; Cochrane, Guy R.; Kvitek, Rikk G.; Manson, Michael W.; Endris, Charles A.; Dieter, Bryan E.; Watt, Janet T.; Krigsman, Lisa M.; Sliter, Ray W.; Lowe, Erik N.; Chin, John L.
Johnson, S.Y., Dartnell, P., Golden, N.E., Hartwell, S.R., Erdey, M.D., Greene, H.G., Cochrane, G.R., Kvitek, R.G., Manson, M.W., Endris, C.A., Dieter, B.E., Watt, J.T., Krigsman, L.M., Sliter, R.W., Lowe, E.N., and Chin, J.L. (S.Y. Johnson and S.A. Cochran, eds.), 2015, California State Waters Map Series—Offshore of Fort Ross, California: U.S. Geological Survey Open-File Report 2015–1211, pamphlet 37 p., 10 sheets, scale 1:24,000, http://dx.doi.org/10.3133/ofr20151211.

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Year Published: 2015

The 2014 update to the National Seismic Hazard Model in California

The 2014 update to the U. S. Geological Survey National Seismic Hazard Model in California introduces a new earthquake rate model and new ground motion models (GMMs) that give rise to numerous changes to seismic hazard throughout the state. The updated earthquake rate model is the third version of the Uniform California Earthquake Rupture Forecast...

Powers, Peter M.; Field, Edward H.

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Year Published: 2015

Validation of simulated earthquake ground motions based on evolution of intensity and frequency content

Simulated earthquake ground motions can be used in many recent engineering applications that require time series as input excitations. However, applicability and validation of simulations are subjects of debate in the seismological and engineering communities. We propose a validation methodology at the waveform level and directly based on...

Rezaeian, Sanaz; Zhong, Peng; Hartzell, Stephen H.; Zareian, Farzin

Filter Total Items: 961
lidar truck
July 8, 2019

Scanning surface rupture from Searles Valley earthquake

 

USGS Earthquake Science Center Mobile Laser Scanning truck operated by Ben Brooks and Todd Ericksen scanning the surface rupture near the zone of maximum surface displacement of the M7.1 Searles Valley earthquake.

rupture
July 8, 2019

Northern end of rupture resulting from the M7.1 Searles Valley quake

Fault rupture crosses dirt road, with California Geologial Survey vehicles for scale. Displacement at this location is primarily normal (vertical). Photograph taken near the northern end of the rupture resulting from the M7.1 Searles Valley earthquake.

fault rupture
July 7, 2019

Searles Valley Earthquake field photo #1

USGS Geologists Beth Haddon and Josie Nevitt measure fault displacement along the principal rupture.

fault rupture
July 7, 2019

Searles Valley Earthquake field photo #2

USGS geologists Josie Nevitt and Beth Haddon make measurements of fault rupture.

fault rupture
July 7, 2019

Searles Valley Earthquake field photo #3

USGS Geophysicists Elizabeth Cochran and Nick VanDerElst install a seismometer on the base.

fault rupture
July 7, 2019

Searles Valley Earthquake field photo #4

USGS geodesist Todd Ericksen sets up GPS surveying equipment on July 5th.

fault rupture
July 7, 2019

Searles Valley Earthquake field photo #5

USGS geophysicist Ken Hudnut demonstrating Drop Cover and Hold Technique during the foreshock sequence to the M7.1 Searles Valley earthquake.

fault rupture
July 7, 2019

Searles Valley Earthquake field photo #6

Aerial view shot from Blackhawk helicopter overflight on July 6 of the zone of high surface displacement.

fault rupture
July 7, 2019

Searles Valley Earthquake field photo #7

USGS geologist Josie Nevitt and geodesist Todd Ericksen collect a sample from the fault zone of the main rupture.

fault rupture
July 7, 2019

Searles Valley Earthquake field photo #8

Truck scanning road offset on the base with USGS geologist Josie Nevitt walking along side.

fault rupture
July 7, 2019

Searles Valley Earthquake field photo #9

Vertical fault rupture on road with truck.

Image shows a road with damage from an earthquake
July 6, 2019

Damage to Access Road from Searles Valley Earthquake

Fault scarp at offset access road site. Center line has been offset up and to the right as one looks across the fault towards the east.

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USGS air photo of the Mud Creek landslide, taken on May 27, 2017
November 1, 2017

On May 20, 2017, more than 2 million cubic meters of rock and dirt—enough to fill a line of dump trucks nearly a thousand miles long—collapsed down the steep slopes at Mud Creek on California’s Big Sur coast, about 140 miles south of San Francisco. A pile of rubble almost a third of a mile wide buried California State Highway 1 over 65 feet deep and added about 13 acres of new land to the coast.

charred, bare trees on a mountain side
October 19, 2017

California's landscape is prone to drought and warmer climates. The recent drought lasted five years (2011 – early 2017), bringing with it many environmental issues including the increased prevalence, severity, and duration of wildfires. While there used to be a distinct "wildfire season" in California, the threat of wildfire is no longer restricted to a single season.

Photo of a plane dropping flame retardant on a wildfire
October 12, 2017

NAPA, SONOMA COUNTIES — As the Tubbs, Atlas, and Nuns fires raged across northern California, WERC's Jon Keeley appeared on NPR to provide insight into fire ecology across the state.

WERC surveying sea otters
September 29, 2017

According to data released Friday by the U.S. Geological Survey and partners, the three-year average of the total counts of southern sea otters was down from last year’s high, although it still exceeded the U.S. Fish and Wildlife Service’s delisting threshold for a second straight year.

USGS science for a changing world
September 7, 2017

Editor: In the public interest and in accordance with FAA regulations, the USGS is announcing this low-level airborne project. Your assistance in informing the local communities is appreciated.

A wildfire in a forest
September 7, 2017

A growing number of wildfire-burned areas throughout the western United States are expected to increase soil erosion rates within watersheds, causing more sediment to be present in downstream rivers and reservoirs, according to a new study by the U.S. Geological Survey.

Image: Burning Sagebrush
September 6, 2017

An examination of long-term data for lands managed by the Bureau of Land Management finds that land treatments in the southwestern United States are increasingly large, expensive and related to fire and invasive species control.

USGS science for a changing world
August 14, 2017

The U.S. Geological Survey awarded approximately $4.9 million this week to six universities and a university-governed non-profit, to support transitioning the west coast “ShakeAlert” earthquake early warning system into a production system.

Image: USGS Logo
July 31, 2017

A new U.S. Geological Survey-led study suggests that earthquake-related deformation just below the Earth's surface can be quite different from how it is expressed at the surface.

Photo of the Mud Creed landslide near Big Sur, California
July 14, 2017

Scientists from the USGS Pacific Coastal and Marine Science Center mapped the offshore extent of the Mud Creek landslide on California’s Big Sur coast on July 11, 2017.

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