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: 418
Date published: October 26, 2018
Status: Active

Determination of the geohydrologic characteristics of the boundary between the Mojave River and Antelope Valley groundwater basins, California

The Mojave Basin Area was adjudicated in 1993 and the Mojave Water Agency (MWA) was appointed as Watermaster to ensure that water rights are allocated according to the Court Judgment (Riverside County Superior Court, 1996). Established in 1960, the southwestern boundary of MWA’s management area is not a hydrologic boundary but instead coincides roughly with the boundary between San Bernardino...

Date published: October 26, 2018
Status: Active

Coordinated Pesticide Reconnaissance Study of Surface Waters in California

Pesticides are used throughout the State of California in both urban and agricultural settings and are routinely detected in surface water. Each year, new pesticides are introduced to the market and often become detected in surface water. It can take several years or more for routine monitoring programs to acquire the capability to detect new and understudied pesticides of concern because...

Contacts: James Orlando
Date published: October 26, 2018
Status: Completed

Atmospheric Deposition Contributions to Mercury Yields in Select Watersheds in the Western United States and Canada

The atmosphere plays an important role in the delivery to and cycling of mercury (Hg) in the environment and it can be a major source of Hg contamination to surface waters. Globally, atmospheric deposition of Hg is the primary source of Hg related concerns for human and ecosystem health (Fitzgerald and others, 1998). In California and other areas in the United States, Hg use in gold and silver...

Date published: October 24, 2018
Status: Active

Monitoring Mercury and Methylmercury in Water, Sediment and Biota in Combie Reservoir Before and After Dredging and Mercury Removal

Dredging to maintain water storage capacity by the Nevada Irrigation District (NID) occurred at Lake Combie reservoir, one of several reservoirs along the Bear River, California over the past 40 years on an as-needed basis to maintain water storage capacity. Maintenance dredging operations were halted by the Central Valley Regional Water...

Date published: October 24, 2018
Status: Active

The Effects of Artificial Recharge on Nitrate Concentrations in Groundwater in the Joshua Tree Subbasin, California

The Joshua Basin Water District (JBWD) is implementing an artificial groundwater recharge program to reverse the decline of groundwater levels and to store water in the Joshua Tree groundwater subbasin of the Morongo groundwater basin (~100 mi east of Los Angeles, CA).

Contacts: David O'Leary
Date published: October 24, 2018
Status: Active

Subsidence from Aquifer-Storage and Recovery in the East Bay Plain

The East Bay Municipal Utility District (EBMUD) has proposed to store and recover as much as 10 million gallons of water per day (MGD) at an aquifer storage and recovery (ASR) site, the Bayside Groundwater Project. Water will be stored in a 100-ft sequence of coarse-grained sediment (the "Deep Aquifer") underlying the East Bay Plain and the adjacent Niles Cone ground-water basin.

Contacts: Michelle Sneed
Date published: October 23, 2018
Status: Active

Webinar: Linking Remote Sensing and Bird Behavior Data to Understand the Impacts of Drought on Waterfowl

View this webinar to learn how scientists are exploring the impacts of drought on waterfowl.

Date published: October 23, 2018
Status: Active

Installation of two multiple-well monitoring sites near a proposed supplemental recharge well project, Central Basin, Los Angeles County, Federal Fiscal Year 2016

The Water Replenishment District of Southern California (WRD) is planning to construct an advanced water treatment facility and three supplemental injection wells in a recharge area in the coastal plain of Los Angeles County. 

Date published: October 23, 2018
Status: Active

Extending PyLith to address your earthquake and volcanic deformation modeling needs- Brad Aagaard

Collaborate with developers of the state-of-the-art, open-source, community-code PyLith to add new features and use them to model complex earthquake or volcanic processes. This is your opportunity to expand your software development, numerical modeling, and geoscience skills while furthering your research and contributing to the broader community!

Date published: October 23, 2018
Status: Active

Simulation of Groundwater Flow and Land Subsidence in the Antelope Valley Groundwater Basin

Prior to 1972, groundwater provided more than 90 percent of the total water supply in Antelope Valley, California (~50 miles northeast of Los Angeles); since 1972, it has provided between 50 and 90 percent (the balance provided by imported surface water). Most groundwater pumping in the valley occurs in the Antelope Valley groundwater basin, which includes the rapidly growing cities of...

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

Simulating Land 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 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
Filter Total Items: 577
Date published: January 1, 2019

Atmospheric-loading frequency response functions and groundwater-levels filtered for the effects of atmospheric loading and solid Earth tides for three monitoring wells near Mammoth Lakes, California, 2015 - 2017.

The data include atmospheric-loading frequency response functions (table 1) and filtered detrended and reconstructed (trends restored) groundwater-levels (tables 2 to 4) computed for selected, parsed time series for three USGS monitoring wells [28A-25-1 (373904118570701); 28A-25-2 (373904118570702); and 14A-25-1 (373927118571701)], and the associated hourly res

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 flood depth and duration projections: average conditions 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

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

CoSMoS (Coastal Storm Modeling System) Central California v3.1 flood-hazard projections: 100-year storm in San Luis Obispo 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 water-level projections: average conditions in San Luis Obispo 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

CoSMoS (Coastal Storm Modeling System) Central California v3.1 flood depth and duration projections: average conditions in San Mateo 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

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

CoSMoS (Coastal Storm Modeling System) Central California v3.1 flood-hazard projections: 100-year storm 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 ocean-currents projections: 20-year storm in Santa Barbara 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

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

Filter Total Items: 450
Publication Thumbnail
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

Publication Thumbnail
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.

Publication Thumbnail
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

Publication Thumbnail
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

Publication Thumbnail
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.

Publication Thumbnail
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

Publication Thumbnail
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.

Publication Thumbnail
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.

Publication Thumbnail
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

Publication Thumbnail
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.

Publication Thumbnail
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.

Publication Thumbnail
Year Published: 2010

Estuarine sedimentation, sediment character, and foraminiferal distribution in central San Francisco Bay, California

Central San Francisco Bay is the deepest subembayment in the San Francisco Bay estuary and hence has the largest water volume of any of the subembayments. It also has the strongest tidal currents and the coarsest sediment within the estuary. Tidal currents are strongest over the west-central part of central bay and, correspondingly, this area is...

Chin, John L.; Woodrow, Donald L.; McGann, Mary; Wong, Florence L.; Fregoso, Theresa A.; Jaffe, Bruce E.
Estuarine sedimentation, sediment character, and foraminiferal distribution in central San Francisco Bay, California; 2010; OFR; 2010-1130; Chin, John L.; Woodrow, Donald L.; McGann, Mary; Wong, Florence L.; Fregoso, Theresa; Jaffe, Bruce E.

Filter Total Items: 1,120
A person crouches over the water handling scientific equipment at dusk with rocks in the background
October 12, 2018

Andrea "Andy" O'Neill in Monterey

“The ocean is the closest I can get to an unexplored world, without going into space... I mean, I feel a deep connection to the ocean and its constant rhythms, but when I visit, there's a new discovery or appreciation every time. People should care about the ocean for the same reason we care about the air we breathe and the water we drink - it is an essential part of Life

...
A man wearing safety gear steers a personal watercraft looking to the right, with a small ocean wave behind him.
October 11, 2018

Mapping nearshore depths along a beach

Cordell Johnson uses a personal watercraft (PWC) equipped with GPS and sonar to measure seafloor depths near the beach.

Burned forest with a few small plants growing between burned trees.
October 11, 2018

Hillside at Whiskeytown National Recreation Area 2 Months After Fire

A landscape at Whiskeytown National Recreation Area 2 months after summer 2018's Carr Fire near Redding, California, where USGS WERC researchers are studying fire impacts, post-fire vegetation recovery, and post-fire erosion and debris flows.

...
Burned hill after fire with dead and charred trees.
October 11, 2018

Hill at Whiskeytown National Recreation Area 2 Months After Fire

A landscape at Whiskeytown National Recreation Area 2 months after summer 2018's Carr Fire near Redding, California, where USGS WERC researchers are studying fire impacts, post-fire vegetation recovery, and post-fire erosion and debris flows.

...
Clearing and road with burned hillside in the background.
October 11, 2018

Landscape at Whiskeytown National Recreation Area 2 Months After Fire

A landscape at Whiskeytown National Recreation Area 2 months after summer 2018's Carr Fire near Redding, California, where USGS WERC researchers are studying fire impacts, post-fire vegetation recovery, and post-fire erosion and debris flows.

...
Roadside area with burned  clearing and trees.
October 11, 2018

Hillside at Whiskeytown National Recreation Area 2 Months After Fire

A landscape at Whiskeytown National Recreation Area 2 months after summer 2018's Carr Fire near Redding, California, where USGS WERC researchers are studying fire impacts, post-fire vegetation recovery, and post-fire erosion and debris flows.

...
A man walks across low sand dunes wearing a backpack and carrying a hand-held computer, near water, smoke stacks in distance.
October 10, 2018

Measuring dune elevations

Dan Nowacki measures dune elevations near the mouth of the Pajaro River with a precision GPS unit carried in his backpack.

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
Filter Total Items: 980
CalVO's Stuart Wilkinson skis out to a remote seismic instrument in...
February 24, 2016

Earthquakes rocked residents near the towns of Mammoth Lakes and Big Pine in eastern California this month, including a magnitude 3.74 and 3.44 on February 15 near Mammoth Lakes and another magnitude 4.8 near Big Pine on February 16.

Landsat image shows the marine stratus and stratocumulus cloud layer that moved into the San Francisco Bay-Delta
February 10, 2016

A new series of maps of fog and low clouds covering the northern and central California coasts reveals daytime and nighttime patterns with a level of detail never previously mapped. U.S. Geological Survey scientists used new analyses of satellite images to understand the dynamics of fog. 

USGS
January 1, 2016

We are pleased to announce the Spanish translation of our recently published CalVO Fact Sheet The California Volcano Observatory – Monitoring the State's Restless Volcanoes.

Long Valley Caldera Range Front Fault Diagram...
December 22, 2015

The shaking hazard posed by earthquakes on range-front faults near the town of Mammoth Lakes, CA is lower than previously estimated.

USGS science for a changing world logo
December 10, 2015

CORVALLIS, Ore. – Northern spotted owl populations are declining in all parts of their range in the Pacific Northwest, according to research published in The Condor. Based on data from 11 study areas across Washington, Oregon and northern California, a rangewide decline of nearly 4 percent per year was estimated from 1985 to 2013.

Image:  Big Sagebrush Re-establishing 15 Years Post-wildfire Along the Boise Front Mountains
December 7, 2015

CORVALLIS, Ore. — Ecosystem restoration is complex and requires an understanding of how the land, plants, and animals all interact with each other over large areas and over time. Today, the U.S. Geological Survey published part two of a three-part handbook addressing restoration of sagebrush ecosystems from the landscape to the site level.

USGS
November 24, 2015

A new study completed by the U.S. Geological Survey, in cooperation with the Borrego Water District, will help water planners in the Borrego Valley, California better understand and manage the groundwater resources that the area relies on for drinking water, agriculture and recreation.

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.