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: 419
Date published: October 19, 2018
Status: Completed

Using Numerical Models to Simulate Subsidence

The California Water Science Center has been involved in multiple studies simulating land subsidence associated with groundwater withdrawal. The simulations can be used to estimate the magnitude, location, and timing of subsidence. They can also be used to evaluate management strategies to mitigate adverse effects from subsidence while also optimizing water availability.

Contacts: Claudia C Faunt
Date published: October 18, 2018
Status: Active

Decomposition of Organic Soils in the Sacramento-San Joaquin Delta

The Sacramento-San Joaquin Delta of California was once a great tidal freshwater marsh. It is blanketed by peat and peaty alluvium deposited where streams originating in the Sierra Nevada, Coast Ranges, and South Cascade Range enter San Francisco Bay. In the late 1800s, levees were built along the stream channels, and the land thus protected from flooding was drained, cleared, and planted ('...

Date published: October 18, 2018
Status: Active

Aquifer Compaction due to Groundwater Pumping

Although land subsidence caused by groundwater pumping has caused many negative effects on human civil works for centuries, especially in the highly developed urban or industrialized areas of Europe, the relation between subsidence and groundwater pumpage was not understood or recognized for a long time. Recognition began in 1928 when pioneer researcher O.E. Meinzer of the U.S. Geological...

Contacts: Michelle Sneed
Date published: October 18, 2018
Status: Active

Genomic Mechanisms that Underlie Lack of Recovery of Prince William Sound Herring Following the 1990s Collapse

In the decades following the Exxon Valdez Oil Spill (EVOS), it has become increasingly apparent that oil can be toxic at extremely low concentrations to developing fish embryos including herring, where some toxic phenotypes may be apparent during embryogenesis, but some are delayed until later in life. Therefore, acute and lingering oil may act as an insidious selective force within...

Contacts: Paul Hershberger, Ph.D., Jacob Gregg, Ashley MacKenzie, William Richards, Andrew Whitehead, John Incardona, Nat Scholtz
Date published: October 17, 2018
Status: Active

Land Subsidence in the San Joaquin Valley

The San Joaquin Valley is one of the most productive agricultural regions in the nation. Beginning around the 1920's, farmers relied upon groundwater for water supply. Over time, overpumping caused groundwater-level declines and associated aquifer-system compaction and land subsidence that resulted in permanent aquifer-system storage loss.

Contacts: Michelle Sneed
Date published: October 15, 2018
Status: Completed

Debris-Flow Forecasts Before Wildfires

Release Date: OCTOBER 15, 2018

USGS scientists have been pursuing a way to assess debris-flow hazards before a fire occurs.

Date published: October 3, 2018
Status: Active

Implementing New Acoustic Monitoring Techniques in the Trinity River

Accurate river-sediment data is fundamental to planning and managing river restoration efforts on the Trinity River, and throughout the world’s waterways. The USGS has developed a “hydrophone” that enables scientists to listen to sediment particles as they move along the riverbed in order to inexpensively and reliably record near-continuous sediment-bedload-transport data. For this study,...

Date published: August 30, 2018
Status: Active

Yucaipa Subbasin Integrated Hydrologic Model

The USGS is developing a hydrologic model of the Yucaipa Subbasin to aid in evaluating and managing the groundwater resources in the area. The study results will provide a greater understanding of the geohydrology of the subbasin, and aid in the development of a groundwater-monitoring plan, as well as in the evaluation of potential hydrologic effects of future groundwater development and...

Contacts: Geoff Cromwell
Date published: August 30, 2018
Status: Active

Microbial Biogeochemistry — Menlo Park, California

About the Research

The Environmental Health Program collaborates with microbiologists at the Microbial Biogeochemistry Laboratory to develop and apply innovative methods to measure key microbial processes. These methods are used to better understand how major biogeochemical cycles (carbon, nitrogen, sulfur, and iron) interact with and control the speciation and fate of...

Date published: August 28, 2018
Status: Active

Organic Chemistry Research — Sacramento, California

About the Research

The Environmental Health Program collaborates with chemists and hydrologists at the Organic Chemistry Research Laboratory (OCRL) to develop targeted analytical methods for the quantitation of chemicals that can impact the health of organisms and humans. The scientists have developed methods in a wide variety of environmental media; in addition to...

Date published: August 27, 2018
Status: Completed

Increasing Soil Organic Carbon to Mitigate Greenhouse Gases and Increase Climate Resiliency for California

Rising air temperatures are projected to continue to drive up urban, agricultural, and rangeland water use, straining both surface and groundwater resources. Scientific studies have shown that managing farms, ranches, and public lands to increase soil carbon can increase soil waterholding capacity and increase hydrologic benefits such as increased baseflows and aquifer recharge, reduced...

Contacts: Michelle Stern
Date published: August 24, 2018
Status: Active

Yucaipa Valley Hydrogeology

This study assesses the quality of water in the Yucaipa area, primarily in the Yucaipa plain. This hydrogeology study will aid local water purveyors in understanding and evaluating local resources and using those resources effectively in combination with water imported from northern California and from the adjacent San Bernardino area.

Contacts: Gregory Mendez
Filter Total Items: 580
Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 water-level projections: 20-year storm in San Francisco County

This data contains model-derived total water levels (in meters) for the sea-level rise (SLR) and storm condition indicated.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenarios. Projecti

Date published: January 1, 2019

Structure-from-motion point cloud of Mud Creek, Big Sur, California, 2017-10-12

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

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 flood-hazard projections: 20-year storm in San Mateo County

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

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 wave-hazard projections: 20-year storm in San Luis Obispo County

This data contains maximum model-derived significant wave height (in meters) for the sea-level rise (SLR) and storm condition indicated.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenar

Date published: January 1, 2019

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

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

Date published: January 1, 2019

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

This data contains maximum model-derived significant wave height (in meters) for the sea-level rise (SLR) and storm condition indicated.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenar

Date published: January 1, 2019

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

This data contains maximum depth of flooding (cm) in the region landward of the present-day shoreline for the sea-level rise (SLR) and storm condition indicated.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-le

Date published: January 1, 2019

Structure-from-motion point cloud of Mud Creek, Big Sur, California, 2017-12-07

Presented here is a point cloud collected by the U.S. Geological Survey (USGS) using a UAS-mounted camera system, covering the area of the Mud Creek landslide on California State Route 1 (SR1), Mud Creek, Big Sur, California. Point cloud is referenced to previously published lidar data and contains RGB information as well as XYZ. Point cloud coordinates are in NAD83 UTM Zone 10 me

Date published: January 1, 2019

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

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

Date published: January 1, 2019

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

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

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 wave-hazard projections: 20-year storm in Santa Barbara County

This data contains maximum model-derived significant wave height (in meters) for the sea-level rise (SLR) and storm condition indicated.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenar

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 ocean-currents projections: 20-year storm in San Francisco County

This data contains maximum model-derived ocean currents (in meters per second) for the sea-level rise (SLR) and storm condition indicated.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scen

Filter Total Items: 470
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Year Published: 2011

Bathymetry and digital elevation models of Coyote Creek and Alviso Slough, South San Francisco Bay, California

In 2010, the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center completed three cruises to map the bathymetry of the main channel and shallow intertidal mudflats in the southernmost part of south San Francisco Bay. The three surveys were merged to generate comprehensive maps of Coyote Creek (from Calaveras Point east to the...

Foxgrover, Amy C.; Finlayson, David P.; Jaffe, Bruce E.; Fregoso, Theresa A.
Foxgrover, A.C., Finlayson, D.P., Jaffe, B.E., and Fregoso, T.A., 2011, Bathymetry and digital elevation models of Coyote Creek and Alviso Slough, South San Francisco Bay, California (ver. 5.0, June 2020): U.S. Geological Survey Open-File Report 2011–1315, 21 p., https://doi.org/10.3133/ofr20111315.

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Year Published: 2011

Emergency assessment of postwildfire debris-flow hazards for the 2011 Motor Fire, Sierra and Stanislaus National Forests, California

This report presents an emergency assessment of potential debris-flow hazards from basins burned by the 2011 Motor fire in the Sierra and Stanislaus National Forests, Calif. Statistical-empirical models are used to estimate the probability and volume of debris flows that may be produced from burned drainage basins as a function of different...

Cannon, Susan H.; Michael, John A.
Emergency assessment of postwildfire debris-flow hazards for the 2011 Motor Fire, Sierra and Stanislaus National Forests, California; 2011; OFR; 2011-1251; Cannon, Susan H.; Michael, John A.

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Year Published: 2011

Relative abundance and distribution of fishes within an established Area of Critical Environmental Concern, of the Amargosa River Canyon and Willow Creek, Inyo and San Bernardino Counties, California

The Amargosa River Canyon of San Bernardino and Inyo County, California, has been designated by the Bureau of Land Management as an Area of Critical Environmental Concern, due in part to its unique flora and fauna. As a task of the Area of Critical Environmental Concern implementation plan, a survey of native fishes was conducted from June 21 to...

Scoppettone, G. Gary; Hereford, Mark E.; Rissler, Peter H.; Johnson, Danielle M.; Salgado, Antonio
Relative abundance and distribution of fishes within an established Area of Critical Environmental Concern, of the Amargosa River Canyon and Willow Creek, Inyo and San Bernardino Counties, California; 2011; OFR; 2011-1161; Scoppettone, G. Gary; Hereford, Mark E.; Rissler, Peter H.; Johnson, Danielle M.; Salgado, Antonio

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Year Published: 2011

Isostatic gravity map of the Point Sur 30 x 60 quadrangle and adjacent areas, California

This isostatic residual gravity map is part of a regional effort to investigate the tectonics and water resources of the central Coast Range. This map serves as a basis for modeling the shape of basins and for determining the location and geometry of faults in the area. Local spatial variations in the Earth's gravity field (after removing...

Watt, J.T.; Morin, R.L.; Langenheim, V. E.
Isostatic gravity map of the Point Sur 30 x 60 quadrangle and adjacent areas, California; 2011; OFR; 2011-1036; Watt, J.T.; Morin, R.L.; Langenheim, V.E.

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Year Published: 2011

Overview of the ARkStorm scenario

The U.S. Geological Survey, Multi Hazards Demonstration Project (MHDP) uses hazards science to improve resiliency of communities to natural disasters including earthquakes, tsunamis, wildfires, landslides, floods and coastal erosion. The project engages emergency planners, businesses, universities, government agencies, and others in preparing for...

Porter, Keith; Wein, Anne; Alpers, Charles N.; Baez, Allan; Barnard, Patrick L.; Carter, James; Corsi, Alessandra; Costner, James; Cox, Dale; Das, Tapash; Dettinger, Mike; Done, James; Eadie, Charles; Eymann, Marcia; Ferris, Justin; Gunturi, Prasad; Hughes, Mimi; Jarrett, Robert; Johnson, Laurie; Le-Griffin, Hanh Dam; Mitchell, David; Morman, Suzette; Neiman, Paul; Olsen, Anna; Perry, Suzanne; Plumlee, Geoffrey; Ralph, Martin; Reynolds, David; Rose, Adam; Schaefer, Kathleen; Serakos, Julie; Siembieda, William; Stock, Jonathan D.; Strong, David; Wing, Ian Sue; Tang, Alex; Thomas, Pete; Topping, Ken; Wills, Chris; Jones, Lucile
Overview of the ARkStorm scenario; 2011; OFR; 2010-1312; Porter, Keith; Wein, Anne; Alpers, Charles; Baez, Allan; Barnard, Patrick; Carter, James; Corsi, Alessandra; Costner, James; Cox, Dale; Das, Tapash; Dettinger, Michael; Done, James; Eadie, Charles; Eymann, Marcia; Ferris, Justin; Gunturi, Prasad; Hughes, Mimi; Jarrett, Robert; Johnson, Laurie; Le-Griffin, Hanh Dam; Mitchell, David; Morman, Suzette; Neiman, Paul; Olsen, Anna; Perry, Suzanne; Plumlee, Geoffrey; Ralph, Martin; Reynolds, David; Rose, Adam; Schaefer, Kathleen; Serakos, Julie; Siembieda, William; Stock, Jonathan; Strong, David; Wing, Ian Sue; Tang, Alex; Thomas, Pete; Topping, Ken; Wills, Chris; Jones, Lucile

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Year Published: 2011

A novel member of the family Hepeviridae from cutthroat trout (Oncorhynchus clarkii)

Beginning in 1988, the Chinook salmon embryo (CHSE-214) cell line was used to isolate a novel virus from spawning adult trout in the state of California, USA. Termed the cutthroat trout (Oncorhynchus clarkii) virus (CTV), the small, round virus was not associated with disease, but was subsequently found to be present in an increasing number of...

Batts, William; Yun, Susan; Hedrick, Ronald; Winton, James
A novel member of the family Hepeviridae from cutthroat trout (Oncorhynchus clarkii); 2011; Article; Journal; Virus Research; Batts, William; Yun, Susan; Hedrick, Ronald; Winton, James

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Year Published: 2011

Deep rock damage in the san andreas fault revealed by P- and S-type fault-zone-guided waves

Damage to fault-zone rocks during fault slip results in the formation of a channel of low seismic-wave velocities. Within such channels guided seismic waves, denoted by Fg, can propagate. Here we show with core samples, well logs and Fg-waves that such a channel is crossed by the SAFOD (San Andreas Fault Observatory at Depth) borehole at a depth...

Ellsworth, William L.; Malin, Peter E.

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Year Published: 2011

Effect of dietary salt on migration and survival of yearling steelhead produced at Iron Gate Hatchery, Klamath River, 2009

We surgically implanted radio transmitters into 30 hatchery yearling steelhead (Oncorhynchus mykiss) released from Iron Gate Hatchery during the spring of 2009 to improve our understanding of the effect of dietary salt on their out-migration and survival. Steelhead yearlings were divided into two feed treatments to test the efficacy of a salt-...

Juhnke, S.; Hansel, H.; Wright; Hetrick

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Year Published: 2011

Soil-geomorphic significance of land surface characteristics in an arid mountain range, Mojave Desert, USA

Mountains comprise an extensive and visually prominent portion of the landscape in the Mojave Desert, California. Landform surface properties influence the role these mountains have in geomorphic processes such as dust flux and surface hydrology across the region. The primary goal of this study was to describe and quantify land surface properties...

Hirmas, D.R.; Graham, R.C.; Kendrick, K.J.
Soil-geomorphic significance of land surface characteristics in an arid mountain range, Mojave Desert, USA; 2011; Article; Journal; Catena; Hirmas, D. R.; Graham, R. C.; Kendrick, K. J.

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Year Published: 2011

Unusual dominance by desert pupfish (Cyprinodon macularius) in experimental ponds within the Salton Sea Basin

In October 2006, months after shallow experimental ponds in the Salton Sea Basin were filled with water from the Alamo River and Salton Sea, fish were observed in several ponds, although inlets had been screened to exclude fish. During October 2007–November 2009, nine surveys were conducted using baited minnow traps to document species and...

Saiki, Michael K.; Martin, Barbara A.; Anderson, Thomas W.

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Year Published: 2010

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

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

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

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Year Published: 2010

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

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

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

Filter Total Items: 1,107
The backs of two scientists wearing USGS vests and hard hats, looking out at a drone in the sky, standing in a field, with a bur
October 7, 2018

USGS researchers fly a drone over Whiskeytown National Recreation Area

USGS ecologist and drone pilot Chase Freeman flies a drone for at Whiskeytown National Recreation Area to assess the impacts of the 2018 Carr Fire, while technician Kylie Mosher looks on.

A  small group gathers around a woman who's extracting a sediment core from a marshy area while a man talks.
October 7, 2018

Examining core stratigraphy within Humboldt slough

Humboldt State University Assistant Professor Melanie Michalak (squatting) and California State Geological Survey scientist Jay Patton (standing, center) explaining core stratigraphy within Humboldt slough and evidence for past tsunami inundation. Integrating evidence of past earthquakes and tsunamis from offshore and onshore geologic evidence is key to understanding the

...
A map shows features of the bottom of the ocean off the coast.
October 5, 2018

Backscatter map offshore of Santa Cruz

Between November 2014 and June 2016 the U.S. Geological Survey, Pacific Coastal and Marine Science Center (PCMSC) conducted eight repeat, high-resolution bathymetry and acoustic-backscatter surveys of a small patch of seafloor offshore Santa Cruz in northern Monterey Bay, California. PCMSC also collected oceanographic time-series data over the same two-year period.

September 27, 2018

PubTalk 9/2018 - Hayward Earthquake

Title: The 150th Anniversary of the Damaging 1868 Hayward Earthquake: Why It Matters and How We Can Prepare for Its Repeat

  • The Hayward Fault in the heart of the Bay Area is one of the most urbanized faults in the US.
  • Studies of the fault reveal that it has produced 12 large earthquakes in the past 2000 years spaced 100-220 years apart.
  • There
View along a beach with gentle waves, low dunes, and two sets of tire tracks in the sand, one set winding and one set straight.
September 13, 2018

Southern Monterey Bay beach studies

After USGS scientist Dan Hoover drove a couple of pass with his all-terrain vehicle (ATV), equipped with gear that collects elevations, on a mostly flat beach in southern Monterey Bay, California. Then he turned to take this photo of his tire tracks. The ATV operator will follow beach elevation features (note the curved tire tracks where Hoover traced the high-water mark

...
Two people on personal watercraft maneuver separately and spaced apart in a beach setting near a jetty.
September 12, 2018

Beach survey on personal watercraft

Two personal watercraft operators from the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California, navigate their personal watercraft (PWC) in the shallow nearshore region in Moss Landing near Elkhorn Slough. The PWCs are set up with precision GPS and echosounder systems in order to create detailed bathymetric maps (depth).

An all-terrain vehicle equipped with GPS and other devices sits on the beach and a personal watercraft is in background.
September 12, 2018

PWC and ATV for beach surveys

For typical beach surveys, USGS scientists drive an all-terrain vehicle (ATV) like the one shown here, equpped with precision GPS that collects location and elevation data. Driving along features such as high-water marks, and driving a grid pattern spaced by about 30 meters, enable the collection of a complete 3D representation of the beach surface. Meanwhile, 2 personal

...
A man wearing a hard hat and waders sits on an all-terrain vehicle equipped with instruments that collect data.
September 12, 2018

Equipped and ready to collect data

USGS oceanographer Andrew Stevens, of the Pacific Coastal and Marine Science Center in Santa Cruz, California, sits on an all-terrain vehicle equipped with a precision GPS and other instruments. The GPS collects position data continuously, about 2 points per second, while an operator like Andrew drives the ATV over a beach. The points can then be rendered into a 3D

...
A group stands on the stern of a ship preparing an instrument attached to a cabling system.
September 12, 2018

The chirp 512i on R/V Rainier

Science and ship crew on board NOAA research vessel Rainier prepare the Chirp 512i off south-central California.

looking at laptop on boat
September 11, 2018

Examining data aboard on boat

USGS scientist looking at laptop on boat

A RestoreNet garden with plots covered by white cloth.
August 31, 2018

RestoreNet garden testing seedling establishment.

The RestoreNet gardens test seedlings of priority restoration species across the Southwest. This is a recently installed garden located in the juniper woodlands of the Colorado Plateau. The experiemental network will support land managers by providing insight into various restoration techniques, including testing seedlings vs seeds.

city skyline with tall buildings lit up at night and bridge in left foreground
August 15, 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

Filter Total Items: 984
Planned US Topo map production schedule for the next three- year revision cycle
November 19, 2015

With the release of new US Topo maps for Illinois and South Dakota, the USGS has completed the second, three-year cycle of revising and updating electronic US Topo quadrangles. This means that since late 2009, the USGS has published nearly every map in the conterminous U.S., twice.

Geologic field-trip guide to Lassen Volcanic National Park and vici...
November 16, 2015

USGS geologists Patrick Muffler and Michael Clynne published a new geologic field-trip guide for areas in and around Lassen Volcanic National Park in northern California.

Conceptual geologic model of partially crystallized magma (C1, C3) ...
November 4, 2015

USGS CalVO scientists have developed a new 3D conceptual model of the magma system below Mono Lake and Mono Craters in eastern California to give scientists a more detailed understanding of volcanic processes at depth.

Image: Mono Lake and Mono Craters Landscape Overview
October 29, 2015

A new conceptual model of the magma system below Mono Lake and Mono Craters in eastern California gives scientists a more detailed understanding of volcanic processes at depth, and a better model for forecasting volcanic unrest.

USGS science for a changing world logo
October 26, 2015

The rate of earthquakes has increased sharply since 2009 in the central and eastern United States, with growing evidence confirming that these earthquakes are primarily caused by human activity, namely the injection of wastewater in deep disposal wells.

USGS
October 22, 2015

Joint Venture Silicon Valley and the U.S. Geological Survey today jointly announced a partnership to address regional challenges from natural hazards, climate and land use change, and continued availability of clean air and water resources.

USGS
October 14, 2015

MENLO PARK, Calif. — U.S. Geological Survey employees in Menlo Park, Calif. will participate in an earthquake safety drill, and test their emergency response plan as part of the Great ShakeOut on Oct. 15, an annual day of action to practice how to protect yourself from an earthquake.

Map of San Joaquin Basin Province
October 6, 2015

The Monterey Formation in the deepest parts of California’s San Joaquin Basin contains an estimated mean volumes of 21 million barrels of oil, 27 billion cubic feet of gas, and 1 million barrels of natural gas liquids, according to the first USGS assessment of continuous (unconventional), technically recoverable resources in the Monterey Formation.

USGS
October 1, 2015

This year, groundwater levels in many wells in California’s Central Valley are at or below historical low levels. In addition, from 2007 through 2015, land subsidence that correlates to areas with large groundwater level declines has strongly increased in two large agricultural areas near the towns of El Nido and Pixley, according to a new article by the U.S. Geological Survey.

A picture of low water levels of the American River
September 23, 2015

The rising temperatures in many of California's rivers have become potentially lethal to anadromous fish, and other fish species. Even in rivers controlled by reservoirs, where operators have traditionally been able to help control river temperature by timed releases, the combination of low flows, reduced cold-water pools in reservoirs and high air temps has resulted in elevated river temps.

Image: Severe Coastal Erosion During an El Niño Storm
September 21, 2015

SANTA CRUZ, Calif. — The projected upsurge of severe El Niño and La Niña events will cause an increase in storm events leading to extreme coastal flooding and erosion in populated regions across the Pacific Ocean, according to a multi-agency study published today in Nature Geoscience.

Image: Sea Otter Ready for a Nap
September 17, 2015

SANTA CRUZ, Calif. — The recovery of southern sea otters appears to have taken an upturn, according to results from the annual California sea otter survey released by the U.S. Geological Survey today. Yet despite an overall increase in sea otter abundance, sharks have been “taking a bite” out of the portion of the population that could fuel expansion into new areas.