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: December 18, 2018
Status: Active

Water-Level, Water-Quality and Land-Subsidence Studies in the Mojave River and Morongo Groundwater Basins

Groundwater has been the primary source of domestic, agricultural, and municipal water supplies in the southwestern Mojave Desert, California, since the early 1900s. The population of the Mojave River and Morongo groundwater basins has grown rapidly during the last several decades, increasing from an estimated population of almost 273,000 in 1990 (...

Date published: December 18, 2018
Status: Completed

Pesticide Studies in the Sacramento/San Joaquin Delta and San Francisco Bay Estuary

The objectives of this specific study are to characterize the mixtures of current-use pesticides and pesticide degradates entering the Sacramento/San Joaquin Delta from its two main river sources over a period of 12 consecutive months. 

Contacts: James Orlando
Date published: December 17, 2018
Status: Completed

Delta sediment measurements to support numerical modeling of turbidity

The purpose of the proposed work is to collect data that will support the development, calibration, and validation of numerical models of sediment transport and turbidity in the Sacramento-San Joaquin Delta. 

Contacts: Scott A Wright
Date published: December 17, 2018
Status: Completed

Geomorphic Assessment and Restoration Alternatives Development for the Merced River in East Yosemite Valley, Yosemite National Park

The National Park Service (NPS) and USGS jointly will investigate impacts to the Merced River due to infrastructure and historic channel widening in east Yosemite Valley with a goal of constructing river management alternatives. Past management actions, such as gravel mining, channel riprap, and the construction of bridges that do not accommodate flood flows, have had long-lasting impacts to...

Contacts: Scott A Wright
Date published: December 14, 2018
Status: Completed

Assessing the Feasibility of Artificial Recharge and Storage and the Effectiveness and Sustainability of Insitu Arsenic Removal in the Antelope Valley, California

Project Update - 8/2/2011: Water having an arsenic concentration of 30 micrograms per liter was infiltrated from a test pond beginning in December, 2010. After water moved downward through the unsaturated zone, arsenic concentrations in ...

Contacts: Tracy Nishikawa
Date published: December 14, 2018
Status: Completed

Additional characterization of the impact of suction dredging, South Yuba River – Humbug Creek

The potential impacts of suction dredging on water quality remain largely undetermined, especially with regard to trace metals including Hg. Several State of California regulatory agencies have expressed concerns that suction dredging may cause deleterious impacts with regard to turbidity and Hg contamination in downstream areas.

Date published: December 14, 2018
Status: Completed

Determination of Mercury Loads for Cache Creek Settling Basin Inflow and Outflows and Related Investigations

Mercury (Hg), a legacy pollutant from mining of mercury deposits in the Coast Ranges as well as gold deposits in the Sierra Nevada, has contaminated surface waters throughout northern California. Methylmercury (MeHg) is an organic form of Hg that bioaccumulates in food webs to elevated concentrations that threaten ecological health and human health through consumption of sport fish. 

Date published: December 14, 2018
Status: Completed

Statistical Evaluation of Factors Affecting Occurrence of Organic Constituents from Fuels in Public-Supply Wells in Southern California

Biofuels, including ethanol, are expected to provide a greater contribution to the fuel supply in the United States. Research in the past decade has shown that ethanol in gasoline can cause plumes of benzene in groundwater to be larger than they would otherwise be.

Date published: December 14, 2018
Status: Active

Water-resources study of Fort Irwin National Training Center

The U.S. Army at Fort Irwin National Training Center (NTC) obtains all of its potable water supply from Irwin, Langford, and Bicycle Basins within the base boundaries. Groundwater pumping, since as early as 1941, has resulted in water-level declines in all of these basins and the disposal of treated wastewater in the Irwin Basin has resulted in elevated nitrate concentrations in some wells in...

Date published: December 14, 2018
Status: Completed

San Joaquin-Sacramento Basin Rain Flood Duration Skew Study

The U.S. Army Corps of Engineers (USACE) is conducting a hydrologic analysis of floodplain areas protected by the federal-state levee system within the San Joaquin-Sacramento drainage basins. 

Date published: December 14, 2018
Status: Completed

Modeling in support of development of biocriteria for wadeable California streams and rivers

The State Water Resources Control Board (SWRCB) of California has initiated a process to develop biological objectives for wadeable freshwater streams and rivers for the entire state.

Contacts: Larry Brown
Date published: December 14, 2018
Status: Active

San Antonio Creek Water Availability

Located in Santa Barbara County, California, the San Antonio Creek Groundwater Basin is a rural agricultural area that is reliant on local water supplies, predominantly groundwater. Because of the growth of irrigated agriculture in the area, water demands have increased significantly, taxing local groundwater supplies. Groundwater resources are also used to supply local inhabitants, as well as...

Contacts: Geoff Cromwell
Filter Total Items: 588
Date published: January 1, 2020

Assessing spatial variability of nutrients and related water quality constituents in the California Sacramento-San Joaquin Delta at the landscape scale: 2018 High resolution mapping surveys

The dataset documents the spatial and temporal variability of nutrients and related water quality parameters at high spatial resolution in the North Delta, Central Delta, and the Western Delta out to Suisun Bay in the Sacramento-San Joaquin River Delta of California, USA. The dataset includes nitrate, ammonium, phosphate, dissolved organic carbon, temperature, conductivity, diss

Date published: January 1, 2020

Inorganic chemistry data for groundwater wells near selected oil fields in the southwestern San Joaquin Valley, central California

This digital dataset contains geochemical and other information for 1,209 samples of groundwater from 343 wells located within 3-miles of the Buena Vista, Elk Hills, Midway-Sunset, and North and South Coles Levee oil fields in the southwestern San Joaquin Valley of central California. Data were compiled by the U.S. Geological Survey (USGS) from preexisting datasets and transferred man

Date published: December 31, 2019

Geochemical, mineralogical, and grain-size data for in-situ solid materials and suspended sediment at Malakoff Diggins State Historic Park, Nevada County, California

This dataset includes data for in-situ solid materials and suspended sediments from surface-water samples, as well as surface-water chemistry from samples collected during storm events at Malakoff Diggins State Historic Park, Nevada County, California. In-situ solid samples were collected during 2015 along six vertical transects along the cliff walls of the mine pit. Surface-water samples w...

Date published: December 23, 2019

Field and Laboratory data of pipe scale forming in acid mine drainage pipelines at Iron Mountain and Leviathan Mines, California

Pipelines carrying acid mine drainage at Iron Mountain and Leviathan Mines (CA, USA) develop pipe scale, a precipitate that forms inside the pipelines. The U.S. Geological Survey is studying the composition of the pipe scale and the acid mine drainage water flowing through the pipeline through field samples and laboratory experimentation. This data release provides the data from the stu

Date published: December 16, 2019

Pesticide Constituent Data from the California Groundwater Ambient Monitoring and Assessment Program Priority Basin Project (GAMA-PBP), 2004 - 2018

The California Groundwater Ambient Monitoring and Assessment Program Priority Basin Project (GAMA-PBP) submitted 2,994 samples in 2004-2018 to the USGS National Water Quality Laboratory (NWQL) for analysis of pesticide constituents on NWQL schedules 2003, 2032, or 2033, and 840 samples in 2004-2011 for analysis of pesticide constituents on NWQL schedule 2060. Fram and Stork (201

Date published: November 27, 2019

Chirp and minisparker seismic-reflection data of field activity F-02-07-NC collected offshore San Mateo County, California, from 2007-03-22 to 2007-04-06

High-resolution single-channel Chirp and minisparker seismic-reflection data were collected by the U.S. Geological Survey in March and April 2007, offshore San Mateo County, California. Data were collected aboard the R/V Fulmar during field activity F-02-07-NC. Chirp data were collected using an EdgeTech 512 chirp subbottom system and were recorded with a Triton SB-Logger. Minisparker data

Date published: November 27, 2019

Minisparker seismic-reflection data from field activity L-1-06-SF collected offshore Bolinas to San Francisco, California from 2006-09-25 to 2006-10-03

High-resolution single-channel minisparker seismic-reflection data were collected by the U.S. Geological Survey in September and October 2006 offshore Bolinas to San Francisco, California. Data were collected aboard the R/V Lakota, during field activity L-1-06-SF. Minisparker data were collected using a SIG 2-mille minisparker sound source combined with a single-channel streamer, and reco

Date published: November 27, 2019

Chirp seismic-reflection data from field activity L-1-06-SF collected offshore Bolinas to San Francisco, California on 2006-09-30

High-resolution Chirp seismic-reflection data were collected by the U.S. Geological Survey in September 2006 offshore San Francisco, California. Data were collected aboard the R/V Lakota, during field activity L-1-06-SF. Chirp data were collected using an EdgeTech 512 chirp subbottom profiler and recorded with a Triton SB-Logger.

Date published: November 27, 2019

Chirp and minisparker seismic-reflection data of field activity L-1-06-SF collected offshore Bolinas to San Francisco, California from 2006-09-25 to 2006-10-03

High-resolution single-channel Chirp and minisparker seismic-reflection data were collected by the U.S. Geological Survey in September and October 2006, offshore Bolinas to San Francisco, California. Data were collected aboard the R/V Lakota, during field activity L-1-06-SF. Chirp data were collected using an EdgeTech 512 chirp subbottom system and were recorded with a Triton SB-Logger. M

Date published: November 27, 2019

Minisparker seismic-reflection data of field activity F-02-07-NC collected offshore San Mateo County, California, from 2007-03-22 to 2007-04-06

High-resolution single-channel minisparker seismic-reflection data were collected by the U.S. Geological Survey in March and April 2007 from San Francisco to San Gregorio, offshore San Mateo County, California. Data were collected aboard the R/V Fulmar, during field activity F-02-07-NC. Minisparker data were collected using a SIG 2-mille minisparker sound source combined with a single-cha

Date published: November 27, 2019

Chirp seismic-reflection data of field activity F-02-07-NC collected offshore San Mateo County, California, from 2007-03-22 to 2007-04-06

High-resolution single-channel Chirp seismic-reflection data were collected by the U.S. Geological Survey in March and April 2007 from Pacifica to Half Moon Bay, offshore San Mateo County, California. Data were collected aboard the R/V Fulmar, during field activity F-02-07-NC. Chirp data were collected using an EdgeTech 512 chirp subbottom system and recorded with a Triton SB-Logger.

Date published: October 4, 2019

Dissolved Noble Gas Concentrations and Modeled Recharge Temperatures for Groundwater from Northern Sierra Nevada Foothills Shallow Aquifer Assessment Study Units, 2015-2017: Results from the California GAMA Priority Basin Project

This data release documents 155 sets of dissolved noble gas analyses (neon, argon, krypton, xenon) and 153 modeled recharge temperatures for groundwater sampled from domestic water supply wells and springs throughout the northern Sierra Nevada foothills as part of the California State Water Resources Control Board’s Groundwater Ambient Monitoring and Assessment (GAMA) Progra

Filter Total Items: 485
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Year Published: 2017

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

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

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

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Year Published: 2017

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

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

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

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Year Published: 2017

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

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

Gold, Ryan D.; Briggs, Richard W.; Crone, Anthony J.; Duross, Christopher

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Year Published: 2017

Yolo Bypass Juvenile Salmon Utilization Study 2016—Summary of acoustically tagged juvenile salmon and study fish release, Sacramento River, California

The Yolo Bypass is a flood control bypass in Sacramento Valley, California. Flood plain habitats may be used for juvenile salmon rearing, however, the potential value of such habitats can be difficult to evaluate because of the intermittent nature of inundation events. The Yolo Bypass Juvenile Salmon Utilization Study (YBUS) used acoustic...

Liedtke, Theresa L.; Hurst, William R.
Liedtke, T.L., and Hurst, W.R., 2017, Yolo Bypass Juvenile Salmon Utilization Study 2016—Summary of acoustically tagged juvenile salmon and study fish release, Sacramento River, California: U.S. Geological Survey Data Series 1066, 49 p., https://doi.org/10.3133/ds1066.

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Year Published: 2017

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

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

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

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Year Published: 2017

The transtensional offshore portion of the northern San Andreas fault: Fault zone geometry, late Pleistocene to Holocene sediment deposition, shallow deformation patterns, and asymmetric basin growth

We mapped an ~120 km offshore portion of the northern San Andreas fault (SAF) between Point Arena and Point Delgada using closely spaced seismic reflection profiles (1605 km), high-resolution multibeam bathymetry (~1600 km2), and marine magnetic data. This new data set documents SAF location and continuity, associated tectonic...

Beeson, Jeffrey W.; Johnson, Samuel Y.; Goldfinger, Chris
Beeson, J.W., Johnson, S.Y., and Goldfinger, C., 2017, The transtensional offshore portion of the northern San Andreas fault: Fault zone geometry, late Pleistocene to Holocene sediment deposition, shallow deformation patterns, and asymmetric basin growth: Geosphere, v. 13, n. 4, 34 p.,

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Year Published: 2017

Investigation of late Pleistocene and Holocene activity in the San Gregorio fault zone on the continental slope north of Monterey Canyon, offshore central California

We provide an extensive high‐resolution geophysical, sediment core, and radiocarbon dataset to address late Pleistocene and Holocene fault activity of the San Gregorio fault zone (SGFZ), offshore central California. The SGFZ occurs primarily offshore in the San Andreas fault system and has been accommodating dextral strike‐slip motion between the...

Maier, Katherine L.; Paull, Charles K.; Brothers, Daniel; Caress, David W.; McGann, Mary; Lundsten, Eve M.; Anderson, Krystle; Gwiazda, Roberto
Maier, K.L., Paull, C.K., Brothers, D.S., Caress, D.W., McGann, Mary, Lundsten, E.M., Anderson, Krystle, and Gwiazda, Roberto, 2017, Investigation of Late Pleistocene and Holocene Activity in the San Gregorio Fault Zone on the Continental Slope North of Monterey Canyon, Offshore Central California: Bulletin of the Seismological Society of America, v. 107, p. 1094-1106, doi: 10.1785/0120160261.

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Year Published: 2017

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

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

Field, Edward H.; Milner, Kevin R.; Hardebeck, Jeanne L.; Page, Morgan T.; van der Elst, Nicholas; Jordan, Thomas H.; Michael, Andrew J.; Shaw, Bruce E.; Werner, Maximillan J.

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Year Published: 2017

Trace element contamination in feather and tissue samples from Anna’s hummingbirds

Trace element contamination (17 elements; Be, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Mo, Cd, Ba, Hg, Tl, and Pb) of live (feather samples only) and deceased (feather and tissue samples) Anna's hummingbirds (Calypte anna) was evaluated. Samples were analyzed using inductively coupled plasma-mass spectrometry (ICP-MS; 17 elements) and atomic...

Mikoni, Nicole A.; Poppenga, Robert H.; Ackerman, Joshua T.; Foley, Janet E.; Hazlehurst, Jenny; Purdin, Güthrum; Aston, Linda; Hargrave, Sabine; Jelks, Karen; Tell, Lisa A.
Mikoni, NA, R Poppenga, JT Ackerman, J Foley, J Hazlehurst, G Purdin, L Aston, S Hargrave, K Jelks, LA Tell. 2017. Trace element contamination in feather and tissue samples from Anna’s hummingbirds. Ecological Indicators 80: 96-105. doi: 10.1016/j.ecolind.2017.04.053

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Year Published: 2017

A paleoseismic transect across the northwestern Basin and Range Province, northwestern Nevada and northeastern California, USA

We use new and existing data to compile a record of ∼18 latest Quaternary large-magnitude surface-rupturing earthquakes on 7 fault zones in the northwestern Basin and Range Province of northwestern Nevada and northeastern California. The most recent earthquake on all faults postdates the ca. 18–15 ka last glacial highstand of pluvial Lake Lahontan...

Personius, Stephen; Briggs, Richard W.; Maharrey, J. Zebulon; Angster, Stephen J.; Mahan, Shannon A.
Personius, Stephen F., Briggs, Richard W., Maharrey, J. Zebulon, Angster, Stephen J., and Mahan, Shannon A., 2017, A Paleoseismic transect across the northwestern Basin and Range Province, northwestern Nevada and northeastern California, USA: Geosphere, v. 13, no. 3, p. 782–810, doi:10.1130/GES01380.1.

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Year Published: 2017

Effect of hydraulic hysteresis on the stability of infinite slopes under steady infiltration

Hydraulic hysteresis, including capillary soil water retention (SWR), air entrapment SWR, and hydraulic conductivity, is a common phenomenon in unsaturated soils. However, the influence of hydraulic hysteresis on suction stress, and subsequently slope stability, is generally ignored. This paper examines the influence of each of these three types...

Chen, Pan; Mirus, Benjamin B.; Lu, Ning; Godt, Jonathan W.
Chen, P, BB Mirus. N Lu, JW Godt, 2017. Effect of hydraulic hysteresis on the stability of infinite slopes under steady infiltration. Journal of Geotechnical and Geoenvironmental Engineering, DOI: 10.1061/(ASCE)GT.1943-5606.0001724.

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Year Published: 2017

The California Seafloor and Coastal Mapping Program – Providing science and geospatial data for California's State Waters

The California Seafloor and Coastal Mapping Program (CSCMP) is a collaborative effort to develop comprehensive bathymetric, geologic, and habitat maps and data for California's State Waters. CSCMP began in 2007 when the California Ocean Protection Council (OPC) and the National Oceanic and Atmospheric Administration (NOAA) allocated funding for...

Johnson, Samuel Y.; Cochrane, Guy R.; Golden, Nadine; Dartnell, Peter; Hartwell, Stephen; Cochran, Susan A.; Watt, Janet
Johnson, S.Y., Cochrane, G.R., Golden, N.E., Dartnell, P., Hartwell, S.R., Cochran, S.A., and Watt, J.T., 2017, The California Seafloor Mapping Program - Providing science and geospatial data for California’s State Waters: Ocean and Coastal Management, v. 140, p. 88-104. http://dx.doi.org/10.1016/j.ocecoaman.2017.02.004.

Filter Total Items: 1,119
USGS scientist laying a yellow cable in a desert landscape
July 18, 2019

Collecting Geophysical Data, Fort Irwin National Training Center

USGS Hydrologist, Krishangi Groover, lays wire in preparation for geophysical data collection at the U.S. Army's Fort Irwin National Training Center in California.  The metal bits on this wire connect to metal stakes (one can be seen in the foreground), which allows for the transmission of electricity into the ground to measure sediment properties.  This geophysical data

...
Woman looks through a spotting scope at the ocean
July 17, 2019

Conducting a high tide waterbird survey on San Fransisco Bay

San Francisco Bay and the surrounding wetlands and ponds provide important habitat for waterfowl and shorebirds. To aid land and resource managers in tracking wildlife responses to habitat restoration efforts, Biological Science Technician, Aliya, conducts a high tide waterbird survey of a restored salt pond in the Napa-Sonoma Marshes Wildlife Area at the northern edge of

...
A woman wraps a tape measure around a tree in the forest
July 17, 2019

Measuring a red fir tree in the Sierra Nevada

This is Teodora Rautu. She is a Biological Science Technician on the field crew for USGS Western Ecological Research Center's Sierra Nevada Forest Dynamics project.  She is measuring the diameter of a red fir and trying to navigate the tape through the branches.  All of the trees in the Sierra Nevada Forest Dynamics plots are measured every 5 years, not only for

...
A woman wraps a measuring tape around a very large tree in the forest
July 17, 2019

Measuring a Giant sequoia in the Sierra Nevada

This is Teodora Rautu. She is a Biological Science Technician on the field crew for USGS Western Ecological Research Center's Sierra Nevada Forest Dynamics project.  She is measuring the diameter of a Giant Sequoia.  All of the trees in the Sierra Nevada Forest Dynamics plots are measured every 5 years, not only for determining the size of the trees but also for tracking

...
A woman prepares to cut into a dead tree with a hatchet
July 17, 2019

Beginning a 'tree autopsy' in the Sierra Nevada

This is Teodora Rautu. She is a Biological Science Technician on the field crew for USGS Western Ecological Research Center's Sierra Nevada Forest Dynamics project. The tree she is getting read to cut into has recently died. Teo is going to remove bark to look for signs of insects or pathogens than may have been involved in the tree's death--the first step in a 'tree

...
Two women work together to measure the base of an enormous tree
July 17, 2019

It takes two to measure this Giant Sequoia

Teodora Rautu and Eva Lopez, Biological Science Technicians on the field crew for the USGS Western Ecological Research Center's Sierra Nevada Forest Dynamics project, work together to measure the diameter of a Giant Sequoia. Every tree in the project's long-term study plots are re-measured every 5 years, not only for determining the size of the trees but also for tracking

...
July 17, 2019

ShakeAlert Sensor and Station

This is b-roll footage of a ShakeAlert earthquake early warning system seismic station. These seismic stations and sensors are deployed around California and are used to monitor earthquake activity.
 

Please click on image for full description and image details.
July 16, 2019

2019 Ridgecrest Earthquake Sequence: July 4, 2019–July 16, 2019

3,557 earthquakes recorded since July 4, 2019 above Magnitude 2

M6.4 12km W of Searles Valley, CA
2019-07-04 17:33:49 (UTC)
51,000+ responses via Did You Feel It?

M7.1 18km W of Searles Valley, CA
2019-07-06 03:19:53 (UTC)
42,000+ responses via Did You Feel It?

631 M3+

...
July 13, 2019

Western Toad Hops Towards Road Passage After Reaching Turn-Around

Wildlife passages are one tool used to help amphibians and reptiles cross roads safely. Barrier fencing along the road and "turn-arounds" help guide these animals towards the passageways. In this video, a western toad hops back towards the passage after reaching a turn-around structure, following the barrier fencing.
 

July 12, 2019

Animation of Ridgecrest Foreshock Seq up to M7.1 (Prelim. Results)

This animation shows preliminary results from precise relocation of the Ridgecrest foreshock sequence, up to the the time of occurrence of the M 7.1 mainshock.  The animation begins in a map view and then transitions into a rotating vertical slice.  Earthquakes are colorcoded by time of occurrence, with early events in dark blue and later events (up to the M 7.1) in dark

July 12, 2019

Animation of Ridgecrest Earthquake Seq. thru July 6 (Prelim. Results)

This animation shows preliminary results from precise relocation of the Ridgecrest earthquake sequence, through July 6 (UTC), including the foreshock sequence and the first ~20 hours of aftershocks from M 7.1 mainshock.  The animation begins in a map view and then transitions into a rotating vertical slice.  Earthquakes are colorcoded by time of occurrence, with early

briefing navy
July 9, 2019

USGS provides briefing to Navy about Ridgecrest Earthquake Sequence

Kate Scharer (USGS) provides CO CAPT Paul Dale (Navy) with the field mapping team’s initial product, showing the surface fault rupture at NAWSCL as well as the temporarily deployed seismic and GPS sensors that were rapidly deployed. Contributions of field data from within the base were from CGS & USGS, and from outside the base were from Univ. of Nevada, Reno, EERI,

...
Filter Total Items: 992
Kate Scharer
January 26, 2018

Days after fatal debris flows devastated Southern California’s Montecito community,  a team of U.S. Geological Survey geologists joined county, state, and federal partners to survey and  evaluate the aftermath.

 

Screenshot from interactive mapping tool that displays projections of flooding given sea level rise and other factors.
January 17, 2018

USGS geologist Patrick Barnard spoke to the public at a “Coffee and King Tides” gathering held in Half Moon Bay, California, on December 4.

young man working at a desk with computer and printer
January 12, 2018

News reporters are invited to attend a reception to kick off the U.S. Geological Survey’s STEP-UP Program in Menlo Park. STEP-UP (Secondary Transition to Employment Program – USGS Partnership) provides young adults (ages 18-22) with disabilities a variety of life and job skills to enable them to transition from school to work and to live independently.

USGS volcanologist Jessica Ball leads a discussion during a FEMA Vo...
December 18, 2017

It isn't often that scientists and land managers spend two entire days together talking about volcanoes outside of an eruptive crisis, but a special FEMA training course allows them to do just that.

View looks across a steep coastal hill slope with pampas grass in the foreground, ocean in the background.
November 15, 2017

USGS geologists Jon Warrick and Kevin Schmidt are quoted in a November 9, 2017 Los Angeles Times story.

Photograph looking at the back of a man wearing safety gear and navigating a drone above a ground target in the background.
November 6, 2017

On October 12, 2017, USGS unmanned aerial systems collected video footage of the Mud Creek landslide, which buried California State Highway 1 under a third-of-a-mile-wide mass of rock and dirt on May 20, 2017.

Researchers work on their video-camera station atop a hotel in Santa Cruz, California
November 1, 2017

Coastal communities count on beaches for recreation and for protection from large waves, but beaches are vulnerable to threats such as erosion by storms and flooding. Whether beaches grow, shrink, or even disappear depends in part on what happens just offshore. How do features like shifting sandbars affect waves, currents, and the movement of sand from the beach to offshore and back?

USGS air photo of the Mud Creek landslide, taken on May 27, 2017
November 1, 2017

On May 20, 2017, more than 2 million cubic meters of rock and dirt—enough to fill a line of dump trucks nearly a thousand miles long—collapsed down the steep slopes at Mud Creek on California’s Big Sur coast, about 140 miles south of San Francisco. A pile of rubble almost a third of a mile wide buried California State Highway 1 over 65 feet deep and added about 13 acres of new land to the coast.

charred, bare trees on a mountain side
October 19, 2017

California's landscape is prone to drought and warmer climates. The recent drought lasted five years (2011 – early 2017), bringing with it many environmental issues including the increased prevalence, severity, and duration of wildfires. While there used to be a distinct "wildfire season" in California, the threat of wildfire is no longer restricted to a single season.

Photo of a plane dropping flame retardant on a wildfire
October 12, 2017

NAPA, SONOMA COUNTIES — As the Tubbs, Atlas, and Nuns fires raged across northern California, WERC's Jon Keeley appeared on NPR to provide insight into fire ecology across the state.

WERC surveying sea otters
September 29, 2017

According to data released Friday by the U.S. Geological Survey and partners, the three-year average of the total counts of southern sea otters was down from last year’s high, although it still exceeded the U.S. Fish and Wildlife Service’s delisting threshold for a second straight year.

USGS science for a changing world
September 7, 2017

Editor: In the public interest and in accordance with FAA regulations, the USGS is announcing this low-level airborne project. Your assistance in informing the local communities is appreciated.

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