Due to a lapse in appropriations, the majority of USGS websites may not be up to date and may not reflect current conditions. Websites displaying real-time data, such as Earthquake and Water and information needed for public health and safety will be updated with limited support. Additionally, USGS will not be able to respond to inquiries until appropriations are enacted.  For more information, please see www.doi.gov/shutdown

Regions

California

States L2 Landing Page Tabs

The Pacific Region contains nine science centers across three States—California, Hawaii, and Nevada—and Trust Territories. The headquarters is located in Sacramento, California, where the Regional Director and staff work to further our strategic science direction.

News

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

Research cruise surveys deep-water coral, sponge, and fish habitats off U.S. West Coast.

A man walks across low sand dunes wearing a backpack and carrying a hand-held computer, near water, smoke stacks in distance.
November 1, 2018

From October 9–15, USGS personnel surveyed beaches and the adjacent ocean floor along Monterey Bay’s northern coast.

People stand around a table with posters laid on top, listening thoughtfully to a man who is talking.
November 1, 2018

On October 17, 2018, 17 staff members from the City of Santa Cruz, California toured USGS facilities in the city.

Filter Total Items: 283
USGS
Date Published: December 29, 2106
Status: Completed

Sources of Microbial Contamination at Public Beaches, Santa Barbara

The focus of this study is on analysis of existing hydrologic, chemical, and microbiological data; collection of surface-water and shallow ground-water hydrologic, chemical, and microbiological data; and characterization of dissolved organic carbon composition.

Contacts: John Izbicki
USGS hydrologic technician stands in waist-high waters of a flooded Santa Maria River while taking streamflow measurements
Date Published: December 21, 2018
Status: Active

California Streamgage Information

To help emergency managers and others protect life and property due to floods and other water-related hazards, the USGS delivers a continuous source of streamflow information. The USGS California Water Science Center maintains nearly 500 streamgages that collect data to determine...

a picture of a flooded road in San Diego, CA
Date Published: December 20, 2018
Status: Active

California Flood Science

To help emergency managers and others protect life and property due to floods and other water-related hazards, the USGS delivers a continuous source of streamflow information. The USGS California Water Science Center maintains nearly 500 streamgages that collect data to determine...

Owens Valley Hydrogeology
Date Published: December 20, 2018
Status: Completed

Owens Valley Hydrogeology

The Owens Valley, a long, narrow valley along the east side of the Sierra Nevada in east-central California, is the main source of water for the city of Los Angeles. The city diverts most of the surface water in the valley into the Owens River-Los Angeles Aqueduct system, which transports the water more than 200 miles south to areas of distribution and use. Additionally, ground water is pumped...

Contacts: Wesley Danskin
Irrigation groundwater well
Date Published: December 20, 2018
Status: Active

Sustainable Groundwater Management

In 2014, the State of California adopted historic legislation to help manage its groundwater, the Sustainable Groundwater Management Act (SGMA) . According to the act, local Groundwater Sustainability Agencies (GSAs) must be formed for all...

WAUSP Central Valley Aquifer photo 18
Date Published: December 20, 2018
Status: Active

California's Central Valley

Competition for water resources is growing throughout California, particularly in the Central Valley. The Central Valley's population is expected to increase to 6 million by 2020. This population growth, along with anticipated reductions in Colorado River water deliveries, drought, and the ecological crisis in the Sacramento-San Joaquin Delta, have created an intense demand for water. The...

Contacts: Claudia C Faunt
boat docks sitting on dry lake bed due to severe drought
Date Published: December 19, 2018
Status: Active

California Drought

The USGS closely monitors the effects of drought through data collection and research. USGS science supports water managers in preparing for possible future drought by providing information that takes into account long-term hydrologic, climatic, and environmental changes. These studies support successful planning and science-based decision-making by water managers who must address complex...

Satellite view showing locations of sites sampled during study.
Date Published: December 19, 2018
Status: Completed

Occurrence of Current-use Pesticides in Suisun Bay and Potential Effects on Phytoplankton

Suisun Bay is an area identified as critical habitat for the threatened Delta Smelt. Several important changes in the pelagic food web of this area have been documented over the last two decades indicating that food for Delta Smelt and other threatened fishes is in short. 

Contacts: James Orlando
Longfin Smelt
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
USGS
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
Map of Modoc Regional Wildlife Refuge.
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...

Air photo showing location drill sites in Cache Creek Settling Basin.
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.

Filter Total Items: 67
Floods
/data-tools/california-flood-activity-alerts

California Flood Activity Alerts

RSS feed logo
December 21, 2018

USGS Project Alert Notices RSS feed includes response summaries of USGS streamgaging network activity during storm events in California. These Notices are produced by USGS Streamgaging Programs nationally and can be found on the USGS Current Floods Website.

Science Datasets
/data-tools/oceanographic-and-water-quality-measurements-two-southern-california-coastal-wetlands

Oceanographic and Water Quality Measurements in two Southern California Coastal Wetlands, 2013-2014

Screen grab of study sites for Southern California Coastal Wetlands data release
December 20, 2018

The objective was to compare an urbanized wetland with limited sediment supply (Seal Beach) with a less modified marsh (Pt. Mugu) with fluvial sediment supply. Marine temperature, conductivity, pressure sensors, optical turbidity sensors and acoustic velocity meters were deployed on bottom platforms to quantify the conditions in the water column.

Web Application
/data-tools/drought-groundwater-california

Drought & Groundwater in California

line chart for continuous GPS site P304 in Mendota showing depth to water in feet and land subsidence in inches
December 19, 2018

Long-term groundwater-level data are fundamental to the resolution of problems dealing with groundwater availability and sustainability. Significant periods of time typically are required to collect water-level data needed to assess the effects of climate variability, to monitor the effects of regional aquifer development, or to obtain data sufficient for analysis of water-level trends.

Web Application
/data-tools/runoff-estimates-california

Runoff Estimates for California

line graph showing monthly runoff, in inches, for California for multiple years
December 19, 2018

Streams, rivers, lakes and reservoirs are important natural resources for irrigation, public supply, wetlands and wildlife.  Excess precipitation that flows into these sources is called runoff, and it's an important drought indicator.  The California Water Science Center tracks both monthly and annual runoff. 

Web Application
/data-tools/mojave-river-and-morongo-groundwater-basins-data-0

Mojave River and Morongo Groundwater Basins Data

screenshot of an interactive map of groundwater data in the Mojave region.  Well sites and water-level contours are displayed.
December 18, 2018

Interactive map of the Mojave and Morongo groundwater basins.  Data layers include sites and data for groundwater levels, water quality, and land subsidence.  Groundwater data spans 1992 to the present.

Web Application
/data-tools/drought-surface-water-california

Drought & Surface Water in California

screenshot of the current streamflow conditions map, showing streamgage sites colored by percent to normal
December 18, 2018

Careful observation and analysis of the movement and condition of surface water is essential for understanding this resource, especially during times of drought. The California Water Science Center uses a network of more than 500 streamgages to collect real-time data on surface water at locations across the state.

Web Application
/data-tools/san-antonio-creek-valley-hydrologic-monitoring

San Antonio Creek Valley Hydrologic Monitoring

screenshot of interactive data map displaying  USGS wells in the San Antonio Creek groundwater basin
December 18, 2018

In order to understand the integrated hydrologic systems in the San Antonio Creek Valley, many different types of data are being gathered from both the surface water and groundwater system. Learn about these data types and explore them with the interactive map.

Web Application
/data-tools/central-valley-drought-indicators

Central Valley: Drought Indicators

Screenshot of the interactive Central Valley drought indicators map
December 17, 2018

During the recent droughts of 2007-2010 and 2012-2017, groundwater pumping has increased from the combined effects of the drought and land-use changes, re-initiating land subsidence. In order to document historical subsidence and monitor continued changes, the USGS has gathered and interpreted data from a variety of sources.

Science Datasets
/data-tools/benchmark-site-data-san-joaquin-valley-ca

Benchmark Site Data | San Joaquin Valley, CA

A geodetic bench mark from the Central Valley in California
December 17, 2018

These 5 northern benchmarks in the San Joaquin Valley are where the largest magnitude of subsidence was recently measured using repeat surveys. That doesn't mean these locations are where the largest magnitude of subsidence occurred, just where it's been measured. The southernmost benchmark in this set is where the largest magnitude was historically measured using repeat surveys.

Science Datasets
/data-tools/compaction-data-central-valley-ca-extensometers

Compaction | Data from Central Valley, CA Extensometers

A green and yellow USGS extensometer installed in a shed
December 17, 2018

Aquifer-system compaction has been monitored at selected locations for various periods with borehole extensometers by different agencies, including the USGS, DWR, SLDMWA, and CCID, and by Luhdorff and Scalmanini Consulting Engineers.  This dataset contains compaction data for 23 extensometers across California's Central Valley.

Science Datasets
/data-tools/continuous-global-positioning-system-cgps-stations

Continuous Global Positioning System (CGPS) Stations

continuous GPS mounted on a tripod, located in a field, with a solar panel in the background
December 17, 2018

The CGPS data were obtained from the UNAVCO Plate Boundary Observatory (PBO) network of continuously operating GPS stations. The PBO is the geodetic component of UNAVCO, a consortium of research institutions whose focus is measuring vertical and horizontal plate boundary deformation across the North American and Pacific Plates in the western U.S. using high-precision measurement techniques.

Science Datasets
/data-tools/insar-central-valley-areas-interest

InSAR | Central Valley Areas of Interest

sample interferogram displaying multiple colors representing different magnitudes of land subsidence or uplift
December 17, 2018

The InSAR technique uses two SAR scenes of the same area taken at different times which are then processed together to produce maps called interferograms that show relative land-surface-elevation change between the two SAR acquisition dates. This Areas of Interest dataset is where InSAR data has been interpreted to produce a time-history of subsidence in the Central Valley, CA.

Filter Total Items: 22
screenshot of interactive data map displaying  USGS wells in the San Antonio Creek groundwater basin
December 18, 2018

In order to understand the integrated hydrologic systems in the San Antonio Creek Valley, many different types of data are being gathered from both the surface water and groundwater system. Learn about these data types and explore them with the interactive map.

screenshot of interactive map displaying groundwater, water quality, streamgage, and microgravity sites
December 10, 2018

The Lower Colorado Monitoring Network is a series of groundwater-level and water-quality wells, as well as streamgages and micro-gravity sites. This interactive map displays the sites and provides links to the most current data.

Map of California with areas of subsidence shaded by cause
December 7, 2018

In California, land subsidence—mostly from groundwater pumping—was first documented by the USGS in the early 20th century. Completion of State and Federal water projects that bring water from California's wet north to its dry south allowed some groundwater aquifers to recover, and subsidence decreased in these areas. Subsidence continues today, sometimes at high rates of more than 1 foot/year.

screenshot of the user interface
November 13, 2018

This interactive webmap plots water-quality data from domestic and public-supply wells sampled by the USGS for the California Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin Project (GAMA-PBP), and allows users to download datasets. The GAMA-PBP is a cooperative program between the California State Water Resources Control Board and the U.S. Geological Survey. 

screenshot of an interactive map of groundwater data in the Mojave region.  Well sites and water-level contours are displayed.
November 7, 2018

Interactive map of the Mojave and Morongo groundwater basins.  Data layers include sites and data for groundwater levels, water quality, and land subsidence.  Groundwater data spans 1994 to the present.

Map displaying areas in California where the USGS has built groundwater models
August 30, 2018

The USGS models shown on this site are in the public domain, and are freely available. They are based on MODFLOW and other public-domain USGS software. Links to publications and web resources associated with each model are shown in the table next to the model map. The associated model files for some of these models are currently available via download.

Thumbnail image of the cover of USGS Fact Sheet 2016-3020
April 16, 2018

Using information from recent earthquakes, improved mapping of active faults, and a new model for estimating earthquake probabilities, the 2014 Working Group on California Earthquake Probabilities updated the 30-year earthquake forecast for California. They concluded that there is a 72 percent probability (or likelihood) of at least one earthquake of magnitude 6.7 or greater striking somewhere in

 location of and evidence for recent movement on active fault traces within the Hayward Fault Zone, California
April 11, 2018

This map shows the location of and evidence for recent movement on active fault traces within the Hayward Fault Zone, California.

Shake map for At511 Scenario
April 11, 2018

The maps in this archive display estimated intensities and ground motions for the largest earthquakes in the HayWired aftershock sequence. The aftershock sequence follows the HayWired M7.0 mainshock that is imagined to occur on April 18, 2018 along the Hayward Fault.These maps have been used in analyses of the HayWired scenario.

Interactive map showing earthquake scenario data
April 11, 2018

The HayWired scenario depicts a hypothetical M7.0 earthquake on California’s Hayward Fault. This site includes an interactive map showing fault traces and ShakeMap contours, information on the tectonic setting of the Hayward Fault and fault rupture history; and a USGS ShakeMap, which provides ground motion information for the HayWired scenario mainshock.

Map of California showing the sections of the coast where the USGS has generated computer models of storm impacts.
April 2, 2018

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. Several versions of CoSMoS have been implemented for areas of the California coast, as shown on this map.

screen shot of home page of story map
March 23, 2018

What might it be like the next time the Hayward Fault has a large earthquake? A geonarrative and related imagery examines a hypothetical earthquake, the magnitude 7.0 HayWired earthquake scenario.

Filter Total Items: 133
Year Published: 2018

Survival, travel time, and utilization of Yolo Bypass, California, by outmigrating acoustic-tagged late-fall Chinook salmon

Juvenile Chinook salmon (Oncorhynchus tshawytscha) migrating through California's Sacramento-San Joaquin River Delta toward the Pacific Ocean face numerous challenges to their survival. The Yolo Bypass is a broad floodplain of the Sacramento River that floods in about 70 percent of years in response to large, uncontrolled runoff events. As one of...

Pope, Adam C.; Perry, Russell W.; Hance, Dalton J.; Hansel, Hal C.
Pope, A.C., Perry, R.W., Hance, D.J., and Hansel, H.C., 2018, Survival, travel time, and utilization of Yolo Bypass, California, by outmigrating acoustic-tagged late-fall Chinook salmon: U.S. Geological Survey Open-File Report 2018-1118, 33 p., https://doi.org/10.3133/ofr20181118.

Year Published: 2018

Effects of the proposed California WaterFix North Delta Diversion on survival of juvenile Chinook salmon (Oncorhynchus tshawytscha) in the Sacramento-San Joaquin River Delta, northern California

The California Department of Water Resources and Bureau of Reclamation propose new water intake facilities on the Sacramento River in northern California that would convey some of the water for export to areas south of the Sacramento-San Joaquin River Delta (hereinafter referred to as the Delta) through tunnels rather than through the Delta. The...

Perry, Russell W.; Pope, Adam C.
Perry, R.W., and Pope, A.C., 2018, Effects of the proposed California WaterFix North Delta Diversion on survival of juvenile Chinook salmon (Oncorhynchus tshawytscha) in the Sacramento-San Joaquin River Delta, northern California: U.S. Geological Survey Open-File Report 2018-1078, 94 p. plus appendixes, https://doi.org/10.3133/ofr20181078.

Year Published: 2018

Juvenile Lost River and shortnose sucker year class strength, survival, and growth in Upper Klamath Lake, Oregon, and Clear Lake Reservoir, California—2016 Monitoring Report

Executive SummaryThe largest populations of federally endangered Lost River (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) exist in Upper Klamath Lake, Oregon, and Clear Lake Reservoir, California. Upper Klamath Lake populations are decreasing because adult mortality, which is relatively low, is not being balanced by...

Burdick, Summer M.; Ostberg, Carl O.; Hoy, Marshal S.
Burdick, S.M., Ostberg, C.O., and Hoy, M.S., 2018, Juvenile Lost River and shortnose sucker year class strength, survival, and growth in Upper Klamath Lake, Oregon, and Clear Lake Reservoir, California—2016 Monitoring Report: U.S. Geological Survey Open-File Report 2018–1066, 43 p., https://doi.org/10.3133/ofr20181066.

Year Published: 2018

Effects of the proposed California WaterFix North Delta Diversion on flow reversals and entrainment of juvenile Chinook salmon (Oncorhynchus tshawytscha) into Georgiana Slough and the Delta Cross Channel, northern California

The California Department of Water Resources and Bureau of Reclamation propose new water intake facilities on the Sacramento River in northern California that would convey some of the water for export to areas south of the Sacramento-San Joaquin River Delta (hereinafter referred to as the Delta) through tunnels rather than through the Delta. The...

Perry, Russell W.; Romine, Jason G.; Pope, Adam C.; Evans, Scott D.
Perry, R.W., Romine, J.G., Pope, A.C., and Evans, S.D., 2018, Effects of the proposed California WaterFix North Delta Diversion on flow reversals and entrainment of juvenile Chinook salmon (Oncorhynchus tshawytscha) into Georgiana Slough and the Delta Cross Channel, northern California: U.S. Geological Survey Open File Report 2018-1028, 46 p., https://doi.org/10.3133/ofr20181028.

Year Published: 2018

Clayey landslide initiation and acceleration strongly modulated by soil swelling

Largely unknown mechanisms restrain motion of clay-rich, slow-moving landslides that are widespread worldwide and rarely accelerate catastrophically. We studied a clayey, slow-moving landslide typical of thousands in northern California, USA, to decipher hydrologic-mechanical interactions that modulate landslide dynamics. Similar to some other...

Schulz, William; Smith, Joel B.; Wang, Gonghui; Jiang, Yao; Roering, Joshua J.

Year Published: 2017

A prototype operational earthquake loss model for California based on UCERF3-ETAS – A first look at valuation

We present a prototype operational loss model based on UCERF3-ETAS, which is the third Uniform California Earthquake Rupture Forecast with an Epidemic Type Aftershock Sequence (ETAS) component. As such, UCERF3-ETAS represents the first earthquake forecast to relax fault segmentation assumptions and to include multi-fault ruptures, elastic-rebound...

Field, Edward H.; Porter, Keith; Milner, Kevn
Field, E. H., K. Porter, and K. Milner (2017). A Prototype Operational Earthquake Loss Model for California Based on UCERF3-ETAS – A First Look at Valuation, Earthquake Spectra, Volume 33, No. 4, pages 1–21, DOI: 10.1193/011817EQS017M

Year Published: 2017

Seismic response of soft deposits due to landslide: The Mission Peak, California, landslide

The seismic response of active and intermittently active landslides is an important issue to resolve to determine if such landslides present an elevated hazard in future earthquakes. To study the response of landslide deposits, seismographs were placed on the Mission Peak landslide in the eastern San Francisco Bay region for a period of one year....

Hartzell, Stephen; Leeds, Alena L.; Jibson, Randall W.
Stephen Hartzell, Alena L. Leeds, Randall W. Jibson; Seismic Response of Soft Deposits due to Landslide: The Mission Peak, California, Landslide. Bulletin of the Seismological Society of America ; 107 (5): 2008–2020. doi: https://doi.org/10.1785/0120170033

Year Published: 2017

Science advancements key to increasing management value of life stage monitoring networks for endangered Sacramento River winter-run Chinook salmon in California

A robust monitoring network that provides quantitative information about the status of imperiled species at key life stages and geographic locations over time is fundamental for sustainable management of fisheries resources. For anadromous species, management actions in one geographic domain can substantially affect abundance of subsequent life...

Johnson, Rachel C.; Windell, Sean; Brandes, Patricia L.; Conrad, J. Louise; Ferguson, John; Goertler, Pascale A. L.; Harvey, Brett N.; Heublein, Joseph; Isreal, Joshua A.; Kratville, Daniel W.; Kirsch, Joseph E.; Perry, Russell W.; Pisciotto, Joseph; Poytress, William R.; Reece, Kevin; Swart, Brycen G.
Johnson, R.C., S. Windell, P.L. Brandes, J. L. Conrad, J. Ferguson, P.A.L. Goertler, B.N. Harvey, J. Houblein, J.A. Isreal, D.W. Kratville, J.E. Kirsch, R.W. Perry, J. Pisciotto, W.R. Poytress, K. Reece, and B.G. Swart. 2017. Science advancements key to increasing management value of life stage monitoring networks for endangered Sacramento River winter-run Chinook salmon in California. San Francisco Estuary and Watershed Science, 15(3): Article 1, 41 p.

Year Published: 2017

Refining fault slip rates using multiple displaced terrace risers—An example from the Honey Lake fault, NE California, USA

Faulted terrace risers are semi-planar features commonly used to constrain Quaternary slip rates along strike-slip faults. These landforms are difficult to date directly and therefore their ages are commonly bracketed by age estimates of the adjacent upper and lower terrace surfaces. However, substantial differences in the ages of the upper and...

Gold, Ryan D.; Briggs, Richard; Crone, Anthony J.; Duross, Christopher
Gold, R.D., Briggs, R.W., Crone, A.J., DuRoss, C.B., 2017. Refining fault slip rates using multiple displaced terrace risers—An example from the Honey Lake fault, NE California, USA. Earth and Planetary Science Letters 477, 134-146.

Year Published: 2017

Refining fault slip rates using multiple displaced terrace risers—An example from the Honey Lake fault, NE California, USA

Faulted terrace risers are semi-planar features commonly used to constrain Quaternary slip rates along strike-slip faults. These landforms are difficult to date directly and therefore their ages are commonly bracketed by age estimates of the adjacent upper and lower terrace surfaces. However, substantial differences in the ages of the upper and...

Gold, Ryan D.; Briggs, Richard W.; Crone, Anthony J.; Duross, Christopher
Gold, R.D., Briggs, R.W., Crone, A.J., DuRoss, C.B., 2017. Refining fault slip rates using multiple displaced terrace risers—An example from the Honey Lake fault, NE California, USA. Earth and Planetary Science Letters 477, 134-146.

Year Published: 2017

A synoptic view of the Third Uniform California Earthquake Rupture Forecast (UCERF3)

Probabilistic forecasting of earthquake‐producing fault ruptures informs all major decisions aimed at reducing seismic risk and improving earthquake resilience. Earthquake forecasting models rely on two scales of hazard evolution: long‐term (decades to centuries) probabilities of fault rupture, constrained by stress renewal statistics, and short‐...

Field, Edward H.; Jordan, Thomas H.; Page, Morgan T.; Milner, Kevin R.; Shaw, Bruce E.; Dawson, Timothy E.; Biasi, Glenn; Parsons, Thomas E.; Hardebeck, Jeanne L.; Michael, Andrew J.; Weldon, Ray; Powers, Peter M.; Johnson, Kaj M.; Zeng, Yuehua; Bird, Peter; Felzer, Karen; van der Elst, Nicholas; Madden, Christopher; Arrowsmith, Ramon; Werner, Maximillan J.; Thatcher, Wayne R.

Year Published: 2017

A spatiotemporal clustering model for the Third Uniform California Earthquake Rupture Forecast (UCERF3‐ETAS): Toward an operational earthquake forecast

We, the ongoing Working Group on California Earthquake Probabilities, present a spatiotemporal clustering model for the Third Uniform California Earthquake Rupture Forecast (UCERF3), with the goal being to represent aftershocks, induced seismicity, and otherwise triggered events as a potential basis for operational earthquake forecasting (OEF)....

Field, Edward H.; Milner, Kevin R.; Hardebeck, Jeanne L.; Page, Morgan T.; van der Elst, Nicholas; Jordan, Thomas H.; Michael, Andrew J.; Shaw, Bruce E.; Werner, Maximillan J.
Field, E. H., K. R. Milner, J. L. Hardebeck, M. T. Page, N. van der Elst, T. H. Jordan, A. J. Michael, B. E. Shaw, and M. J. Werner (2017). A Spatiotemporal Clustering Model for the Third Uniform California Earthquake Rupture Forecast (UCERF3-ETAS): Toward an Operational Earthquake Forecast, Bull. Seism. Soc. Am. 107, 1049-1081, doi: 10.1785/0120160173.

Filter Total Items: 4
MODPATH-OBS_distance-direction-observations_USGS-hydrologic-modelling
November 9, 2018

The MODPATH-OBS (Hanson and others, 2013) computer program is designed to calculate simulated equivalents for observations related to advective groundwater transport that can be represented in a quantitative way by using simulated particle-tracking data. 

schematic one water hydrologic model
November 9, 2018

The One-Water Hydrologic Flow Model (MF-OWHM) (Hanson and others, 2014) is a MODFLOW-based integrated hydrologic flow model (IHM) that is the most complete version, to date, of the MODFLOW family of hydrologic simulators needed for the analysis of a broad range of conjunctive-use issues. 

multicolored map of Ocean Shores, Washington
April 13, 2017

The Pedestrian Evacuation Analyst is an ArcGIS extension that estimates how long it would take for someone to travel on foot out of a hazardous area that was threatened by a sudden event such as a tsunami, flash flood, or volcanic lahar. It takes into account the elevation changes and the different types of landcover that a person would encounter along the way.

Filter Total Items: 749
Juvenile salt marsh harvest mouse
December 31, 2018

Juvenile Salt Marsh Harvest Mouse (Reithrodontomys raviventris)

USGS wildlife biologists holding a juvenile salt marsh harvest mouse (Reithrodontomys raviventris). The species is listed as "endangered" under the Endangered Species Act of 1973.

Web browser screen showing an application with different parameters and controls on left and the resulting map on right.
December 31, 2018

Screenshot of Our Coast, Our Future

Screenshot of Our Coast, Our Future (OCOF) interactive map view of Stinson Beach, California, showing extent of flooding predicted if subjected to a sea-level rise of 100 centimeters (about 40 inches) and elevated water levels caused by a 100-year storm.

examples of fieldwork done in the Sacramento-San Joaquin River Delta
December 31, 2018

Fieldwork in California’s Sacramento-San Joaquin River Delta

Top row, left to right: Cordell Johnson (left) and Evan Dailey use the USGS R/V Fast Eddy to collect water samples. Cordell Johnson (left) and Jessie Lacy prepare to deploy a tripod holding instruments to measure water level, currents, and suspended sediment. USGS divers Jenny McKee (left) and Tim Elfers assemble the gear they will need to measure vegetation

...
city skyline at night with tall buildings and bridge in left foreground lit up
December 31, 2018

The Bay Bridge and the Oakland city skyline

The nighttime Oakland city skyline as seen from San Francisco with the Bay Bridge in the foreground

Brown landscape with volcano in the background
December 31, 2018

Mount Shasta, a steep-sided Cascade Range stratovolcano in Northern Ca

Mount Shasta, a steep-sided Cascade Range stratovolcano in Northern California, looms above Little Glass Mountain, a thick obsidian flow erupted from the Medicine Lake shield volcano about 1,000 years ago. These are just two of the young volcanic areas monitored by the USGS California Volcano Observatory. USGS photo.

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

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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

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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.

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.

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

Research cruise surveys deep-water coral, sponge, and fish habitats off U.S. West Coast.

A man walks across low sand dunes wearing a backpack and carrying a hand-held computer, near water, smoke stacks in distance.
November 1, 2018

From October 9–15, USGS personnel surveyed beaches and the adjacent ocean floor along Monterey Bay’s northern coast.

People stand around a table with posters laid on top, listening thoughtfully to a man who is talking.
November 1, 2018

On October 17, 2018, 17 staff members from the City of Santa Cruz, California toured USGS facilities in the city.

city skyline at night with tall buildings and bridge in left foreground lit up
October 17, 2018

By Thomas M. Brocher, Jack Boatwright, James J. Lienkaemper, Carol S. Prentice, David P. Schwartz, and Howard Bundock

Drawn from: USGS Fact Sheet 2018-3052

Men stand on a boat wearing safety gear and they are recovering damaged instrumentation from the water using cables and ropes.
October 5, 2018

Large underwater experiment in California’s Monterey Canyon shows that “turbidity currents” are not just currents, but involve movement of the seafloor itself.

Three men stand together, man at left is pointing to a map and talking, man in middle looks on, man at right takes notes.
September 21, 2018

On September 18, Congressman Jimmy Panetta (20th district, California) and staffer Emmanuel Garcia visited the USGS Pacific Coastal and Marine Science Center in Santa Cruz.

adult male harrier
September 13, 2018

Did you know that the USGS is studying raptors in California? Biologists with the USGS Western Ecological Research Center are hard at work in the field, learning more about the ecology of Northern Harriers and their interactions with migratory waterfowl of concern to the U.S. Fish and Wildlife Service.

View from the top deck of a ship on water, looking down on the bow with three people standing, with a bridge in the background.
September 7, 2018

From July 31 to August 23, a joint USGS-NOAA cruise mapped seafloor depths, texture, and gas seeps in the Cascadia subduction zone offshore of Washington, Oregon, and northern California.

Two women stand on a stage near a wall illuminated with the jet propulsion lab's banner, and at the far end are three flags.
September 7, 2018

USGS and NASA researchers met July 16 at NASA’s Jet Propulsion Laboratory (JPL) to discuss Synthetic Aperture Radar (SAR) imagery of the Southern California coast collected during higher-than-normal tides (“king tides”) in fall 2016.

toad on the road
August 28, 2018

Many amphibians are either too small or too slow to avoid an oncoming car. For some populations of the Federally threatened Yosemite toad (Anaxyrus canorus), this has meant increased mortality from vehicle strikes in addition to other threats from disease, drought, and habitat loss.

California rangelands
August 27, 2018

Governor Edmund G. Brown Jr. today announced the release of new science and planning tools to support California’s continued leadership on actions to address climate change and safeguard the state’s people, economy and resources.

Map highlighting sampling locations of 339 Northern Spotted Owls used in Miller, et al, 2018
August 2, 2018

Federal researchers used landscape genetics to evaluate the role that forest connectivity plays in determining genetic connectivity for the federally-threatened northern spotted owl.

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