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: 421
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
Date published: August 5, 2018
Status: Active

Global Hyperspectral Imaging Spectroscopy of Agricultural-Crops & Vegetation (GHISA)

This webpage showcases the key research advances made in hyperspectral remote sensing of agricultural crops and vegetation over the last 50 years. There are three focus areas:

Date published: July 16, 2018
Status: Completed

A New Map of Rodgers Creek Fault in Sonoma County, California

Release Date: JULY 16, 2018

A new more detailed and higher resolution map of the Rodgers Creek Fault in Sonoma County, California, has been produced using aerial photography and hillshade imagery derived from LiDAR data.

Date published: July 6, 2018
Status: Active

Pesticide Fate Research Group (PFRG)

Pesticides are applied in agricultural and urban areas to control weeds, insects, fungus, and other pests.  Applied pesticides and their degradates can be transported off-site through a variety of mechanisms; these pesticides can then be found in non-target areas. Pesticide transport can occur through the atmosphere, in the aqueous phase (surface and groundwater) and associated with soil/...

Date published: June 27, 2018
Status: Active

Low Intensity Chemical Dosing (LICD)

Rivers, wetlands, and agricultural operations supply natural organic material to the Sacramento-San Joaquin Delta (Delta) and the San Francisco Estuary. This natural organic matter provides many ecosystem benefits, but it also adversely affects drinking water. During drinking water treatment, chlorine added for purposes of pathogen control reacts with dissolved organic carbon (DOC) in the...

Contacts: Tamara Kraus, Phil Bachand
Date published: June 19, 2018
Status: Active

California Water Use

The U.S. Geological Survey's National Water-Use Information Program compiles the nation's water-use data at the county, state, and national levels. USGS five-year reports on national and state water-use estimates between 1950-2015 are posted on the web at: http://water.usgs.gov/watuse/. USGS water-use data for states and counties for...

Contacts: Justin Brandt
Date published: June 14, 2018
Status: Active

Operational CoSMoS model: San Francisco Bay

The San Francisco Bay Coastal Flood Forecast pilot project is an operational CoSMoS model, part of a project funded by the California Department of Water Resources (CA-DWR) and NOAA’s Earth System Research Laboratory (ESRL).

Date published: June 11, 2018
Status: Completed

Slow-Motion Landslides

Release Date: JUNE 11, 2018

Sluggishly-moving earthflows can help us learn what controls the starting and stopping of landslides.

Date published: June 7, 2018
Status: Active

U.S. Highway 50, California - Current Landslide Status

Status as of April 3, 2018

General

This slide moves in response to elevated ground-water pore pressures caused by infiltration from rainfall or melting snow. It typically moves during a wet winter and spring and is dormant during dry times. Continued downslope movement of this slide will likely occur in future wet seasons.

Displayed...

Date published: June 7, 2018
Status: Active

U.S. Highway 50, California - Yearly Information

Yearly summaries of past precipitation, movement, and ground water pressures (for the water year beginning October 1). These can be viewed by opening each year's summary graph.

Filter Total Items: 583
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 wave-hazard projections: 100-year storm 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 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 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

Depth to Transition--Punta Gorda to Point Arena, California

This part of DS 781 presents data for the depth-to-transition map of the Punta Gorda to Point Arena, California, region. The raster data file is included in the "DepthToTransition_PuntaGordaToPointArena.zip," which is accessible from https://doi.org/10.5066/P9PNNI9H.
As part of the USGS's California State Waters Mapping Project, a 50-m grid...

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 water-level projections: average conditions 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, 2017-03-08

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

Date published: January 1, 2019

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

Water quality and ancillary data for assessment of uranium concentrations in groundwater, San Joaquin Valley, CA

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

Date published: January 1, 2019

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

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

Date published: January 1, 2019

Transgressive Contours--Punta Gorda to Point Arena, California

This part of DS 781 presents data for the transgressive contours of the Punta Gorda to Point Arena, California, region. The vector data file is included in the "TransgressiveContours_PuntaGordaToPointArena.zip," which is accessible from https://doi.org/10.5066/P9PNNI9H.
As part of the USGS's California State Waters Mapping Project, a 50-m...

Filter Total Items: 481
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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.

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Year Published: 2010

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

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

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

Filter Total Items: 1,116
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

August 14, 2018

Image of the Week - Mendocino Fire

Landsat 8 captured satellite views of California’s largest wildfire on record in the summer of 2018. The Mendocino Complex Fire in northern California is a combination of two fires: the Ranch Fire and the River Fire. 

Both fires started July 27, and hot, dry, windy conditions caused them to spread rapidly. Landsat 8 imaged the area the day before the fires broke out

Satellite image of fire destruction.
August 11, 2018

Mendocino Complex Fire Scorches Northern California

Landsat 8 captured satellite views of California's largest wildfire on record in the summer of 2018. The Mendocino Complex fire in northern California is a combination of two fires: the Ranch Fire and the River Fire.

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

Figure 1 from Miller, et al, 2018

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

Filter Total Items: 987
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.

Illustration: Study area showing boundaries of each of the seven greater sage-grouse management zones
September 10, 2015

OAKHURST, Calif. -- Overall fire threats to greater sage-grouse habitat are much higher in the western part of the species’ range than in the eastern part, according to a U.S. Geological Survey fire threats assessment study published today.

USGS science for a changing world logo
September 10, 2015

MENLO PARK, Calif. — Some of the inner workings of Earth’s subduction zones and their “megathrust” faults are revealed in a paper published today in the journal “Science.” U.S. Geological Survey scientist Jeanne Hardebeck calculated the frictional strength of subduction zone faults worldwide, and the stresses they are under.

Image: USGS Documents 2015 Drought
September 8, 2015

U.S. Geological Survey hydrologic technicians are currently taking measurements from hundreds of streams and rivers across the western United States as part of a low flow study.

2015 Chile-US Bi-national Exchange participants work together on vo...
September 8, 2015

Scientists, civil authorities, and emergency managers from Chile and the U.S. met in California to discuss the challenges of effective volcanic hazard education, response planning, hazard mitigation, and risk reduction, as part of the second Binational Exchange program for Volcanic Risk Reduction in the Americas.

Image: Moon over Half Dome
September 7, 2015

Despite sounding like something out of Harry Potter, a batholith is a type of igneous rock that forms when magma rises into the earth’s crust, but does not erupt onto the surface. The magma cools beneath the earth’s surface, forming a rock structure that extends at least one hundred square kilometers across (40 square miles), and extends to an unknown depth.

2015 Chile-US Bi-national Exchange participants work together on vo...
September 3, 2015

Scientists, civil authorities, and emergency managers from Chile and the U.S. met in California to discuss the challenges of effective volcanic hazard education, response planning, hazard mitigation, and risk reduction, as part of the second Bi-national Exchange program for Volcanic Risk Reduction in the Americas.

imaging from Mars
September 2, 2015

A new analysis of the largest known deposit of carbonate minerals on Mars helps limit the range of possible answers about how and why Mars changed from a world with watery environments billions of years ago to the arid Red Planet of today.

Image: Drakes Peak
August 24, 2015

SEQUOIA AND KINGS CANYON, Calif. — A new paper published today in Science magazine has synthesized existing studies on the health of temperate forests across the globe and found a sobering diagnosis. Longer, more severe, and hotter droughts and a myriad of other threats, including diseases and more extensive and severe wildfires, are threatening some of these forests with transformation.

August lecture flyer thumbnail
August 24, 2015

The earthquake rate has dramatically increased in the central United States in the last six years. Oklahoma had more magnitude 3 or greater earthquakes in 2014 than California.