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Filter Total Items: 362
Topobathymetric elevation model of San Francisco Bay Area, California
Date Published: October 14, 2019
Status: Active

Topobathymetric Elevation Model of San Francisco Bay Area, California

Accurate, high-resolution elevation information is vital to understanding the natural hazards that can impact the highly populated San Francisco Bay area, such as sea-level rise, winter storms, cliff erosion, and other coastal hazards. The San Francisco Bay estuary three-dimensional (3D) topobathymetric digital elevation model (TBDEM) was developed in collaboration between ...

Two panels showing California map and red line for rupture of fault
Date Published: October 8, 2019
Status: Completed

Earthquake Early Warning – Fine-Tuning for Best Alerts

The goal of an earthquake early warning (EEW) system is to provide an alert to people and automatic systems after an earthquake begins but before the shaking reaches their location. As the USGS and its partners are developing an EEW system, called ShakeAlert®, for the West Coast, the benefits, costs, capabilities, and limitations are being investigated. Two recent studies explored the...

Map showing regional faults and Coso field near Ridgecrest
Date Published: September 30, 2019
Status: Completed

Could the M7.1 Ridgecrest, CA Earthquake Sequence Trigger a Large Earthquake Nearby?

Release Date: SEPTEMBER 30, 2019

Two of the first questions that come to mind for anyone who just felt an earthquake are, “Will there be another one?” and “Will it be larger?”.

USGS
Date Published: August 26, 2019
Status: Completed

Loma Prieta Earthquake Professional Papers

The four Loma Prieta Earthquake Professional Papers, which were published as multiple chapters, comprehensively document the magnitude 6.9 earthquake in California that shook the San Francisco and Monterey Bay regions on October 17, 1989. They contain almost 3000 pages written by 401 investigators of the earthquake. The investigations were funded by a special Congressional appropriation to the...

map
Date Published: August 21, 2019
Status: Active

Directions

Information to help you plan your visit to the Earthquake Science Center.

Fort Tejon Earthquake
Date Published: August 5, 2019
Status: Completed

The Great M7.9 1857 Fort Tejon Earthquake

The Last "Big One"

Image: Damaged Building
Date Published: August 5, 2019
Status: Completed

M6.9 October 17, 1989 Loma Prieta Earthquake

On October 17, 1989, at 5:04:15 p.m. (PDT), a magnitude 6.9 earthquake severely shook the San Francisco and Monterey Bay regions. The epicenter was located near Loma Prieta peak in the Santa Cruz Mountains, approximately 14 km (9 mi) northeast of Santa Cruz and 96 km (60 mi) south-southeast of San Francisco.

Mapped Faults and Seismicity- South Napa
Date Published: August 5, 2019
Status: Completed

M6.0 South Napa, California Earthquake – August 24, 2014

  

Map background with colored blocks drawn on top if it to depict data regions or study areas, each area is labeled with words.
Date Published: July 26, 2019
Status: Active

CoSMoS 3.0: Southern California

CoSMoS 3.0 for southern California provides detailed predictions of coastal flooding due to both future sea-level rise and storms, integrated with predictions of long-term coastal evolution (beach changes and coastal cliff retreat) for the Southern California region, from Point Conception (Santa Barbara County) to Imperial Beach (San Diego County).

Pulsating animation shows a bay and estuaries and changing water depth during two days' worth of tidal cycles.
Date Published: July 26, 2019
Status: Active

CoSMoS 2.1: San Francisco Bay

With primary support from the National Estuarine Research Reserve (NERR), CoSMoS is set-up within the San Francisco Bay as part of Our Coast, Our Future (OCOF).

Web browser screen showing an application with different parameters and controls on left and the resulting map on right.
Date Published: July 26, 2019
Status: Active

CoSMoS 2.0: North-central California (outer coast)

Our Coast, Our Future (OCOF) is a collaborative, user-driven project providing science-based decision-support tools to help coastal planners and emergency responders understand, visualize, and anticipate local impacts from sea-level rise (SLR) and storms...

Shaded relief map of the Mojave Desert region, southern California, showing faults of the Eastern California Shear Zone.
Date Published: July 18, 2019
Status: Active

Western Basin & Range - Eastern California Shear Zone

 

The Eastern California Shear Zone (ECSZ) Mapping project, funded by the National Cooperative Geologic Mapping Program, combines surficial and bedrock geologic mapping, geophysical surveys, and high-resolution topographic data analysis with neotectonic, geomorphic, structural, volcanic, and geochronologic studies to better understand the tectonic framework and landscape...

Contacts: Andrew Cyr
Filter Total Items: 372
USGS
November 27, 2019

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

Map of a western coastline with stretches of the coast labeled to identify data set regions.
October 17, 2019

This dataset contains spatial projections of coastal cliff retreat (and associated uncertainty) for future scenarios of sea-level rise (SLR) in Central California. Present-day cliff-edge positions used as the baseline for projections are also included. Projections were made using numerical models and field observations as part of Coastal Storm Modeling System (CoSMoS). Read metadata carefully.

USGS
October 4, 2019

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

USGS
October 1, 2019

Beginning in November of 2015, a project was undertaken 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 small amount (approximately 0.25

USGS
September 26, 2019

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 (

map of Indian Wells Valley displaying subbasin boundaries and shaded by recharge in mm/year
September 12, 2019

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)

Long thin colorful shape, a map of a strip of coastline whose colors correspond to varying offshore sediment thicknesses.
July 22, 2019

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.

A series of dots with capital letters near them and words beneath.
July 1, 2019

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.

USGS
June 11, 2019

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

map of USGS installed wells in San Diego County, CA
May 16, 2019

Summary tables of data for USGS installed wells in San Diego County, CA.  Included are links to data sets, including well construction, geophysical logs, lithologic logs, groundwater levels, water quality, and streamgages.

tablet showing data
April 26, 2019

The annual review by USGS personnel of furnished records is designed to ensure that furnished records are collected in accordance with USGS standards. Furnished records are provided to the USGS by Federal Energy Regulatory Commission (FERC) licensees and other cooperating agencies as a method for reviewing and quality assuring their records so that the data are collected using methods that result

Filter Total Items: 28
USGS
May 26, 2017

The seismic-landslide probability map covers the counties of Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Santa Cruz, Solano, and Sonoma. The slope failures are triggered by a hypothetical earthquake with a moment magnitude of 7.0 occurring on April 18, 2018, at 4:18 p.m. on the Hayward Fault in the east bay part of California’s San Francisco Bay region.

Screenshot of the interactive Central Valley drought indicators map
November 1, 2016

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.

Digital Elevation Model in the Atchafalaya Basin, LA
April 19, 2016

The 3DEP products and services available through The National Map consist of standard digital elevation models (DEMs) at various horizontal resolutions, elevation source and associated datasets, an elevation point query service and bulk point query service. All 3DEP products are available, free of charge and without use restrictions.

Filter Total Items: 321
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Year Published: 2019

The Santa Cruz Basin submarine landslide complex, southern California: Repeated failure of uplifted basin sediment

The Santa Cruz Basin (SCB) is one of several fault-bounded basins within the California Continental Borderland that has drawn interest over the years for its role in the tectonic evolution of the region, but also because it contains a record of a variety of modes of sedimentary mass transport (i.e., open slope vs. canyon-confined systems). Here,...

Brothers, Daniel S.; Maier, Katherine L.; Kluesner, Jared W.; Conrad, James E.; Chaytor, Jason
Brothers, D.S., Maier, K.L., Kluesner, J.W., and Conrad, J.E., 2018, The Santa Cruz Basin submarine landslide complex, southern California--Repeated failure of uplifted basin sediment; in From the Mountains to the Abyss--The California Borderland as an archive of southern California geologic evolution: Society for Sedimentary Geology, Special Publication No. 110, https://doi.org/10.2110/sepmsp.110.05

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Year Published: 2019

Mapping protected groundwater adjacent to oil and gas fields, San Joaquin Valley, California

Airborne electromagnetic (AEM) surveys are a major component of a regional study of groundwater quality adjacent to oil and gas fields in the San Joaquin Valley of California, USA. AEM resistivity models are being used to delineate groundwater salinity in an effort to locate groundwater adjacent to oil and gas fields that could have future...

Ball, Lyndsay B.; Gillespie, Janice M.; Minsley, Burke; Davis, Tracy; Landon, Matthew K.

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Year Published: 2018

Quantifying post-wildfire hillslope erosion with lidar

Following a wildfire, flooding and debris- flow hazards are common and pose a threat to human life and infrastructure in steep burned terrain. Wildfire enhances both water runoff and soil erosion, which ultimately shape the debris flow potential. The erosional processes that route excess sediment from hillslopes to debris-flow channels in...

Rengers, Francis K.; McGuire, Luke

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Year Published: 2018

Application of the Stream Salmonid Simulator (S3) to the restoration reach of the Trinity River, California—Parameterization and calibration

Executive SummaryIn this report, we constructed and parameterized the Stream Salmonid Simulator (S3) for the 64-kilometer “Restoration Reach” of the Trinity River, just downstream of Lewiston Dam in northern California. S3 is a deterministic life-stage-structured population model that tracks daily growth, movement, and survival of juvenile salmon...

Perry, Russell W.; Jones, Edward C.; Plumb, John M.; Som, Nicholas A.; Hetrick, Nicholas J.; Hardy, Thomas B.; Polos, Joseph C; Martin, Aaron C.; Alvarez, Justin S.; De Juilio, Kyle P.
Perry, R.W., Jones, E.C., Plumb, J.M., Som, N.A., Hetrick, N.J., Hardy, T.B., Polos, J.C., Martin, A.C., Alvarez, J.S., and De Juilio, K.P., 2018, Application of the Stream Salmonid Simulator (S3) to the restoration reach of the Trinity River, California—Parameterization and calibration: U.S. Geological Survey Open-File Report 2018-1174, 64 p., https://doi.org/10.3133/ofr20181174.

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Year Published: 2018

Emigration and transportation stress of juvenile Chinook salmon relative to their reintroduction upriver of Shasta Dam, California, 2017–18

The Bureau of Reclamation supports the Shasta Dam Fish Passage Evaluation (SDFPE; Yip, 2015) program, and in 2016 set out to determine the feasibility of reintroducing winter-run and spring-run Chinook salmon (Oncorhynchus tshawytscha) and steelhead (O. mykiss) to tributaries upstream of Shasta Dam. Ideally, reintroduction strategy includes...

Adams, Noah S.; Liedtke, Theresa L.; Plumb, John M.; Weiland, Lisa K.; Hansen, Amy C.; Evans, Scott D.
Adams, N.S., Liedtke, T.L., Plumb, J.M., Hansen, A.C., Evans, S.D., and Weiland., L.K., 2018, Emigration and transportation stress of juvenile Chinook salmon relative to their reintroduction upriver of Shasta Dam, California, 2017–18: U.S. Geological Survey Open-File Report 2018-1144, 60 p., https://doi.org/10.3133/ofr20181144.

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Year Published: 2018

Reported investments in earthquake mitigation top $73 to $80 billion in the San Francisco Bay Area, California, since the 1989 Loma Prieta earthquake

The purpose of this report is to provide a compilation of structural retrofits and replacements of older buildings and infrastructure in the San Francisco Bay Area that have either been completed since 1989 or that are in progress as of October 2018. For the purposes of this report, all or parts of nine Bay Area counties were included:...

Brocher, Thomas M.; Gefeke, Kerri; Boatwright, John; Knudsen, Keith L.
Brocher, T.M., Gefeke, K., Boatwright, J., and Knudsen, K.L., 2018, Reported investments in earthquake mitigation top \$73 to \$80 billion in the San Francisco Bay Area, California, since the 1989 Loma Prieta earthquake: U.S. Geological Survey Open-File Report 2018–1168, 18 p., https://doi.org/10.3133/ofr20181168.

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Year Published: 2018

Aeromagnetic map of Mountain Pass and vicinity, California and Nevada

Magnetic investigations of Mountain Pass and vicinity were begun as part of an effort to study regional crustal structures as an aid to understanding the geologic framework and mineral resources of the eastern Mojave Desert. The study area, which straddles the state boundary between southeastern California and southern Nevada, encompasses Mountain...

Ponce, David A.; Ponce, David A.; Denton, Kevin M.
Ponce, D.A., and Denton, K.M. (D.A. Ponce, ed.), 2018, Aeromagnetic map of Mountain Pass and vicinity, California and Nevada: U.S. Geological Survey Scientific Investigations Map 3412–B, scale 1:62,500, https://doi.org/10.3133/sim3412B.

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Year Published: 2018

Isostatic gravity map of Mountain Pass and vicinity, California and Nevada

Gravity investigations of Mountain Pass and vicinity were begun as part of an effort to study regional crustal structures as an aid to understanding the geologic framework and mineral resources of the eastern Mojave Desert. The study area, which straddles the state boundary between southeastern California and southern Nevada, encompasses Mountain...

Ponce, David A.; Ponce, David A.; Denton, Kevin M.
Ponce, D.A., and Denton, K.M. (D.A. Ponce, ed.), 2018, Isostatic gravity map of Mountain Pass and vicinity, California and Nevada: U.S. Geological Survey Scientific Investigations Map 3412–A, scale 1:62,500, https://doi.org/10.3133/sim3412A.

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Year Published: 2018

Geophysical and geologic maps of Mountain Pass and vicinity, California and Nevada

U.S. Geological Survey Scientific Investigations Map 3412 is a series of products that consists of geophysical and geologic maps of Mountain Pass and vicinity, California. Maps A and B (red outline in above map image) are gravity and aeromagnetic maps, respectively. The map series was begun as part of an effort to study regional crustal structures...

Ponce, David A.

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Year Published: 2018

Improving earthquake rupture forecasts using California as a guide

This article discusses ways in which earthquake rupture forecast models might be improved. Because changes are most easily described in the context of specific models, the third Uniform California Earthquake Rupture Forecast (UCERF3) and its presumed successor, UCERF4, is used as a basis for discussion. Virtually all of the issues and possible...

Field, Edward H.
Field, E. H. (2018). Improving Earthquake Rupture Forecasts Using California as a Guide, Seismological Research Letters, https://doi.org/10.1785/0220180151.

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Year Published: 2018

Increasing earthquake insurance coverage in California via parametric hedges

California has the highest earthquake risk of any state in the United States. The Federal Emergency Management Agency (FEMA) reported in 2017 that 73% of the nation’s annual losses to earthquakes were expected to be concentrated in California and the Pacific Northwest. California alone constitutes 61% ($3.7 billion out of an estimated $6.1 billion...

Franco, Guillermo; Tirabassi, G; Lopeman, M; Wald, David J.; Siembieda, W.J.

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Year Published: 2018

State transportation agencies partner to deploy and enhance ShakeCast

The California Department of Transportation (Caltrans) is organizing and leading a three-year Transportation Pooled Fund (TPF) project, Connecting the Dots: Implementing ShakeCast Across Multiple State Departments of Transportation for Rapid Post-Earthquake Response. Ten state Departments of Transportation (DOT)—CA, ID, MO, MS, OK, OR, SC, TX, UT...

Turner, L.; Wald, David J.; Lin, Kuo-wan; Chiou, Brian; Slosky, Daniel

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October 10, 2019

October 17, 1989 (Part 1)

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

October 10, 2019

October 17, 1989 (Part 2)

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

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

GPS target

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

September 30, 2019

Prototype Earthquake Early Warning System (Interview)

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

A person on a personal watercraft navigates through waters near a coast with low cliffs and hills way off in background.
September 30, 2019

Santa Barbara survey

Goleta Beach in Santa Barbara experienced an unusual storm and large wave event in the Spring of 2014. Gaviota Pier, seen far off in the background, sustained heavy damage as did the restaurants on the pier and nearby. The USGS conducts seasonal surveys throught the year to see how the beaches are changing through time. Here, a USGS scientist navigates a personal

...
September 26, 2019

PubTalk 09/2019 — Bats in the West

Title: Bats in the West: Discoveries, Questions, and Future Research
By Gabriel A. Reyes, USGS Biologist

  • Learn about bat ecology, diversity, and the role they play in our ecosystem.
  • See how scientists are using a variety of methods including capture, acoustic monitoring, and tracking, to learn more about local bat species.
  • Find out how
person with yellow top and red hardhat
September 11, 2019

Scott Lydeen at Strawberry Peak Seismic Station Tower

USGS technicial Scott Lydeen climbing the tower at the Strawberry Peak seismic station tower, part of the Southern California Seismic Network.

man in the background of a view between clear tubing
September 11, 2019

High-resolution Water Quality Mapping on California's Bay-Delta

Hydrologist Brian Bergamaschi is seen through the USGS California Water Science Center Biogeochemistry Group's underwater water quality mapping manifold. This maze of tygon tubing allows water to be pumped onto a boat while underway, splits the water into multiple flowpaths, and passes the water to various flow-through water quality instruments through a manifold that

...
Quratulain Ahmed preserving samples in fume hood
September 9, 2019

Quratulain Ahmed preserving samples in fume hood

Quratulain Ahmed preserving samples in fume hood

Sydney Berrios running samples on Aqualog
September 8, 2019

Sydney Berrios running samples on Aqualog

Sydney Berrios running samples on Aqualog

Horiba Aqaulog - simultaneously measures absorbance spectra and fluorescence Excitation-Emission Matrices
September 6, 2019

Horiba Aqaulog

Horiba Aqaulog - simultaneously measures absorbance spectra and fluorescence

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Giant gartersnake (Thamnophis gigas)
June 24, 2019

SACRAMENTO – A new study shows how giant gartersnakes use Central Valley rice fields

USGS Scientists taking sediment core at Six Gill Slough restored marsh.
June 6, 2019

California Water Science Center Research Hydrologist Dr. Judith Drexler and others have published an article in the journal Restoration Ecology, observing the progress of a restored salt marsh in southern Puget Sound, Washington.

SEDHYD Conference Image
May 17, 2019

California Water Science Center (CAWSC) hydrologists Joseph Hevesi, Scott Wright, Alexandra Etheridge, Mathieu Marineau, and Michelle Stern will discuss their research at the 2019 Federal Interagency Sedimentation and Hydrologic Modeling (SEDHYD) Conference in Reno, Nevada.

A scene showing the harbor and surrounds at Monaco, Monte Carlo
May 16, 2019

Dr. Christina Kellogg (Research Microbiologist, SPCMSC) is a member of the judging panel that will award winners of the $7 million dollar Shell Ocean Discovery XPRIZE during the final award announcement at the Musée Océanographique de Monaco on May 31.

A huge canyon surrounded by deep-set cliffs opens to reveal a sunny gorge and part of the Colorado River.
April 11, 2019

A new study shows that mysterious cycles in salinity in the lower Colorado River are a result of precipitation patterns in the headwaters of the upper basin more than a thousand river miles away. The salinity levels generally repeat about every 10 years.

Rear-arc basalt lava outcrop
April 2, 2019

Scientists at the volcano observatories of the U.S. Geological Survey pay close attention to volcanoes of the Cascade Range, Alaskan Peninsula and Aleutian Arc.

waves cross a coastal road
March 29, 2019

In less than 30 years the combination of sea-level rise plus an extreme storm along California’s coast could flood more than 150,000 residents and impact over $30 billion in property value. By 2100, up to 600,000 people and $150 billion in property could be at risk from coastal flooding.

research boat on delta
March 15, 2019

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

Flooding in California
March 13, 2019

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

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