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Filter Total Items: 365
USGS
Date Published: December 4, 2018
Status: Completed

Scoping Study of Los Angeles River-Arroyo Seco Confluence Park

The Mountains Recreation and Conservation Authority (MRCA) is considering plans for developing a new park at the confluence of the Los Angeles River and the Arroyo Seco. These plans include removing channel lining and creating a temporary lake using an inflatable rubber dam. Before implementing the plan, a wide array of scientific and engineering issues must be addressed. The U.S. Geological...

Contacts: Michael T Land
Scanning electron microscope image of soil biofilm
Date Published: December 4, 2018
Status: Active

Biogeochemistry of the Critical Zone: Origin and Fate of Organic Matter

Changing temperature, precipitation, and land use intensification has resulted in global soil degradation. The accompanying loss of soil organic matter (SOM) decreases important soil health services. Soil organic matter is a major global pool of carbon; if SOM can be increased, soils can mitigate elevated atmospheric CO2. However, there are major knowledge gaps in SOM persistence....

Map of the San Francisco Estuary
Date Published: December 3, 2018
Status: Active

A Non-Point Source Of Contaminants To The Estuarine Food Web: Mobilized Particles From The Intertidal Zone

The San Francisco Bay and Sacramento-San Joaquin Delta (Bay-Delta) region is a highly urbanized and contaminated estuary with a valuable commercial and recreational fishery (Nichlos et al., 1986; SFEI, 2004). Many fish and birds in the San Francisco Estuary exhibit high levels of contaminants (metals and organic pollutants), which have been shown to affect their behavior and reproductive...

Contacts: Jacob A Fleck
A green and yellow USGS extensometer installed in a shed
Date Published: November 30, 2018
Status: Active

Extensometers and Compaction

Extensometers measure the compaction and expansion of the aquifer system, providing depth-specific data that can help CAWSC scientists better understand the rate, extent, and at what depths in the system subsidence is occurring. 

Contacts: Michelle Sneed
Province 5014 Los Angeles Basin National Oil and Gas Assessments
Date Published: November 30, 2018
Status: Active

Los Angeles Basin Oil and Gas Assessments

The U.S. Geological Survey completed the following assessments of technically recoverable continuous petroleum resources of the Los Angeles Basin Province 5014:

Province 5012 Santa Maria Basin National Oil and Gas Assessments
Date Published: November 30, 2018
Status: Active

Santa Maria Basin Oil and Gas Assessments

The U.S. Geological Survey completed the following assessments of the Santa Maria Basin Province 5012:

 

Province 5013 Ventura Basin National Oil and Gas Assessments
Date Published: November 30, 2018
Status: Active

Ventura Basin Oil and Gas Assessments

The U.S. Geological Survey completed the following assessments of undiscovered, technically recoverable conventional and continuous oil and gas resources of the Ventura Basin Province 5013:

Province 5011 Central Coastal National Oil and Gas Assessments
Date Published: November 30, 2018
Status: Active

Central Coastal Oil and Gas Assessments

The U.S. Geological Survey completed the following assessments of the Central Coastal Province 5011:

Province 5007 Northern Coastal National Oil and Gas Assessments
Date Published: November 30, 2018
Status: Active

Northern Coastal Oil and Gas Assessments

The U.S. Geological Survey completed the following assessment of undiscovered oil and gas resources of the Northern Coastal Province 5007:

 

Province 5008 Sonoma-Livermore Basin National Oil and Gas Assessments
Date Published: November 30, 2018
Status: Active

Sonoma-Livermore Basin Oil and Gas Assessments

The U.S. Geological Survey completed the following assessment of undiscovered oil and gas resources of the Sonoma-Livermore Province 5008:

A massive earthquake swarm at Lo`ihi Seamount...
Date Published: November 29, 2018
Status: Active

Towards Near Surface Ground Motion Characterization in Oklahoma and Texas through Active- and Passive-Seismic Site Characterization- Alan Yong

Earthquakes, such as the 2011 M5.7 Prague, Oklahoma, and recent northern Texas M4 event, demonstrate the need for improved
understanding of site amplification and seismic hazards in the central United States. The intern will be trained by USGS scientists to use the state-of-the-art site investigation methods at seismic station sites in California before applying the methods in Oklahoma...

Water being released into a recharge pond, Yucca Valley, California
Date Published: November 28, 2018
Status: Active

Warren Subbasin Groundwater Recharge

The Hi Desert Water District (HDWD) provides water service to about 10,000 customers in the areas of Yucca Valley, Yucca Mesa, and some unincorporated areas of San Bernardino County. The study area is the 19 square mile Warren subbasin of the Morongo groundwater basin (approximately 100 miles east of Los Angeles, California).

Filter Total Items: 350
Map of a coastline with an outline drawn around a portion of the coast land to show where the study area is.
January 1, 2019

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

USGS
January 1, 2019

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

USGS
January 1, 2019

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

USGS
January 1, 2019

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

Satellite view of a bay with islands, with markers plotted to show sample locations and instrument placement.
January 1, 2019

The U.S. Geological Survey Pacific Coastal and Marine Science Center collected data to investigate sediment dynamics in the shallows of San Pablo Bay in two deployments: February to March 2011 (ITX11) and May to June 2012 (ITX12). This data release includes time-series data and grain-size distributions from sediment grabs collected during the deployments. During each deployment, time

USGS
January 1, 2019

This dataset includes field data for fishes sampled using gill nets during daylight hours in the Northern Sacramento-San Joaquin Delta, California, USA. This data release includes all measured environmental parameters and fish taxa included in the analysis. First posted - August 19, 2019 (available from author) Revised - December 18, 2019 (version 1.1)

Long thin colorful shape, a map of a strip of coastline whose colors correspond to varying offshore sediment thicknesses.
January 1, 2019

This part of DS 781 presents data for the sediment-thickness map of the Point Sur to Point Arguello, California, region. The raster data file is included in the “SedimentThickness_PointSurToPointArguello.zip,” which is accessible from https://doi.org/10.5066/P97CZ0T7.
As part of the USGS's California State Waters Mapping Project, a 50-m grid of sediment thick

RSS feed logo
December 21, 2018

USGS Project Alert Notices RSS feed includes response summaries of USGS streamgaging network activity during storm events in California. These Notices are produced by USGS Streamgaging Programs nationally and can be found on the USGS Current Floods Website.

line chart for continuous GPS site P304 in Mendota showing depth to water in feet and land subsidence in inches
December 19, 2018

Long-term groundwater-level data are fundamental to the resolution of problems dealing with groundwater availability and sustainability. Significant periods of time typically are required to collect water-level data needed to assess the effects of climate variability, to monitor the effects of regional aquifer development, or to obtain data sufficient for analysis of water-level trends.

line graph showing monthly runoff, in inches, for California for multiple years
December 19, 2018

Streams, rivers, lakes and reservoirs are important natural resources for irrigation, public supply, wetlands and wildlife.  Excess precipitation that flows into these sources is called runoff, and it's an important drought indicator.  The California Water Science Center tracks both monthly and annual runoff. 

screenshot of an interactive map of groundwater data in the Mojave region.  Well sites and water-level contours are displayed.
December 18, 2018

Interactive map of the Mojave and Morongo groundwater basins.  Data layers include sites and data for groundwater levels, water quality, and land subsidence.  Groundwater data spans 1992 to the present.

screenshot of the current streamflow conditions map, showing streamgage sites colored by percent to normal
December 18, 2018

Careful observation and analysis of the movement and condition of surface water is essential for understanding this resource, especially during times of drought. The California Water Science Center uses a network of more than 500 streamgages to collect real-time data on surface water at locations across the state.

Filter Total Items: 319
Publication Thumbnail
Year Published: 2012

Effect of brook trout removal from a spawning stream on an adfluvial population of Lahontan cutthroat trout

Independence Lake (Nevada and Sierra counties, California) harbors the only extant native population of Lahontan cutthroat trout Oncorhynchus clarkii henshawi in the Truckee River system and one of two extant adfluvial populations in the Lahontan basin. The persistence of this population has been precarious for more than 50 years, with spawning...

Scoppettone, G. Gary; Rissler, Peter H.; Shea, Sean P.; Somer, William
Effect of brook trout removal from a spawning stream on an adfluvial population of Lahontan cutthroat trout; 2012; Article; Journal; North American Journal of Fisheries Management; Scoppettone, G. Gary; Rissler, Peter H.; Shea, Sean P.; Somer, William

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Year Published: 2012

Selenium in aquatic biota inhabiting agricultural drains in the Salton Sea Basin, California

Resource managers are concerned that water conservation practices in irrigated farmlands along the southern border of the Salton Sea, Imperial County, California, could increase selenium concentrations in agricultural drainwater and harm the desert pupfish (Cyprinodon macularius), a federally protected endangered species. As part of a broader...

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

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Year Published: 2012

Using a non-physical behavioural barrier to alter migration routing of juvenile Chinook salmon in the Sacramento–San Joaquin River Delta

Anthropogenic alterations to river systems, such as irrigation and hydroelectric development, can negatively affect fish populations by reducing survival when fish are routed through potentially dangerous locations. Non-physical barriers using behavioural stimuli are one means of guiding fish away from such locations without obstructing water flow...

Perry, R.W.; Romine, J.G.; Adams, N.S.; Blake, A.R.; Burau, J.R.; Johnston, S.V.; Liedtke, T.L.

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Year Published: 2012

Trimming the UCERF2 hazard logic tree

The Uniform California Earthquake Rupture Forecast 2 (UCERF2) is a fully time‐dependent earthquake rupture forecast developed with sponsorship of the California Earthquake Authority (Working Group on California Earthquake Probabilities [WGCEP], 2007; Field et al., 2009). UCERF2 contains 480 logic‐tree branches reflecting choices among nine...

Porter, Keith A.; Field, Edward H.; Milner, Kevin
Trimming the UCERF2 hazard logic tree; 2012; Article; Journal; Seismological Research Letters; Porter, Keith A.; Field, Edward H.; Milner, Kevin

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Year Published: 2012

Survival and migration route probabilities of juvenile Chinook salmon in the Sacramento-San Joaquin River Delta during the winter of 2009-10

Juvenile Chinook salmon (Oncorhynchus tshawytscha) emigrating from natal tributaries of the Sacramento River may use a number of migration routes to negotiate the Sacramento-San Joaquin River Delta (hereafter, "the Delta"), each of which may influence their probability of surviving. We applied a mark-recapture model to data from acoustically...

Perry, Russell W.; Romine, Jason G.; Brewer, Scott J.; LaCivita, Peter E.; Brostoff, William N.; Chapman, Eric D.

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Year Published: 2012

2011 Georgiana Slough non-physical barrier performance evaluation project report

The Sacramento River and its tributaries support populations of anadromous fish species including winter-run, spring-run, fall-run, and late fall–run Chinook salmon (Oncorhynchus tshawytscha); and steelhead (O. mykiss). Several of these species are listed as threatened or endangered under the California Endangered Species Act (CESA), federal...

Reeves, Ryan R.; McQuirk, Jacob; Ameri, Khalid; Perry, Russell W.; Romine, Jason G.; Liedtke, Theresa L.; Burau, Jon R.; Blake, Aaron R.; Fitzer, Chris; Smith, Natalie; Pagliughi, Steve; Johnston, Sam; Kumagai, Kevin; Cash, Kenneth

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Year Published: 2012

Objective definition of rainfall intensity-duration thresholds for the initiation of post-fire debris flows in southern California

Rainfall intensity–duration (ID) thresholds are commonly used to predict the temporal occurrence of debris flows and shallow landslides. Typically, thresholds are subjectively defined as the upper limit of peak rainstorm intensities that do not produce debris flows and landslides, or as the lower limit of peak rainstorm intensities that initiate...

Staley, Dennis; Kean, Jason W.; Cannon, Susan H.; Schmidt, Kevin M.; Laber, Jayme L.
Objective definition of rainfall intensity-duration thresholds for the initiation of post-fire debris flows in southern California; 2012; Article; Journal; Landslides; Dennis Staley; Jason W Kean; Susan H Cannon; Schmidt, Kevin M.; Laber, Jayme L.

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Year Published: 2012

On the reported ionospheric precursor of the Hector Mine, California earthquake

Using Global Positioning System (GPS) data from sites near the 16 Oct. 1999 Hector Mine, California earthquake, Pulinets et al. (2007) identified anomalous changes in the ionospheric total electron content (TEC) starting one week prior to the earthquake. Pulinets (2007) suggested that precursory phenomena of this type could be useful for...

Thomas, J.N.; Love, J.J.; Komjathy, A.; Verkhoglyadova, O.P.; Butala, M.; Rivera, N.
On the reported ionospheric precursor of the Hector Mine, California earthquake; 2012; Article; Journal; Geophysical Research Letters; Thomas, J. N.; Love, J. J.; Komjathy, A. ; Verkhoglyadova, O. P.; Butala, M. ; Rivera, N.

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Year Published: 2012

Effects of Iron Gate Dam discharge and other factors on the survival and migration of juvenile coho salmon in the lower Klamath River, northern California, 2006-09

Current management of the Klamath River includes prescribed minimum discharges intended partly to increase survival of juvenile coho salmon during their seaward migration in the spring. To determine if fish survival was related to river discharge, we estimated apparent survival and migration rates of yearling coho salmon in the Klamath River...

Beeman, John; Juhnke, Steven; Stutzer, Greg; Wright, Katrina
Effects of Iron Gate Dam discharge and other factors on the survival and migration of juvenile coho salmon in the lower Klamath River, northern California, 2006-09; 2012; OFR; 2012-1067; Beeman, John ; Juhnke, Steven ; Stutzer, Greg ; Wright, Katrina

Publication Thumbnail
Year Published: 2012

On the reported ionospheric precursor of the 1999 Hector Mine, California earthquake

Using Global Positioning System (GPS) data from sites near the 16 Oct. 1999 Hector Mine, California earthquake, Pulinets et al. (2007) identified anomalous changes in the ionospheric total electron content (TEC) starting one week prior to the earthquake. Pulinets (2007) suggested that precursory phenomena of this type could be useful for...

Thomas, Jeremy N.; Love, Jeffrey J.; Komjathy, Attila; Verkhoglyadova, Olga P.; Butala, Mark; Rivera, Nicholas

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Year Published: 2012

Detection probability of an in-stream passive integrated transponder (PIT) tag detection system for juvenile salmonids in the Klamath River, northern California, 2011

A series of in-stream passive integrated transponder (PIT) detection antennas installed across the Klamath River in August 2010 were tested using tagged fish in the summer of 2011. Six pass-by antennas were constructed and anchored to the bottom of the Klamath River at a site between the Shasta and Scott Rivers. Two of the six antennas...

Beeman, John W.; Hayes, Brian; Wright, Katrina
Detection probability of an in-stream passive integrated transponder (PIT) tag detection system for juvenile salmonids in the Klamath River, northern California, 2011; 2012; OFR; 2012-1001; Beeman, John W.; Hayes, Brian ; Wright, Katrina

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Year Published: 2012

Simulated effects of dam removal on water temperatures along the Klamath River, Oregon and California, using 2010 Biological Opinion flow requirements

Computer model simulations were run to determine the effects of dam removal on water temperatures along the Klamath River, located in south-central Oregon and northern California, using flow requirements defined in the 2010 Biological Opinion of the National Marine Fisheries Service. A one-dimensional, daily averaged water temperature model (River...

Risley, John C.; Brewer, Scott J.; Perry, Russell W.
Simulated effects of dam removal on water temperatures along the Klamath River, Oregon and California, using 2010 Biological Opinion flow requirements; 2012; OFR; 2011-1311; Risley, John C.; Brewer, Scott J.; Perry, Russell W.

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April 18, 2019

PubTalk 04/2019 - California's Ecosystems

Title: The Story of California's Changing Ecosystems: As observed from space

  • How can we use images from space to help us understand changes to our coasts, rangelands, forests and wildlife habitats?
  • How can they help to predict future changes?
  • What more can we learn from advances in earth observing technologies?
April 15, 2019

Observing Sierra Nevada Mountain Snowpack 2000-2019 with Terra MODIS

The Moderate Resolution Imaging Spectroradiometer (MODIS) sensor is located aboard NASA’s Terra and Aqua satellites. These data are crucial for studying changes that have occurred on the surface of the Earth, including during times of drought.

This video uses images produced from Terra MODIS Surface Reflectance data over the Sierra Nevada Mountain Range to show

...
A dense field of wildflowers with coastal hills and the ocean in the background
April 6, 2019

Wildflowers in the Channel Islands

Spring wildflowers captured on California's Channel Islands.

The USGS Western Ecological Research Center's Dr. Kathryn McEachern studies plant ecology and restoration on the Channel Islands. Learn more here.

Rear-arc basalt lava outcrop
April 2, 2019

Rear-arc basalt lava outcrop

A 3-4m (10-12 ft) high outcrop of basalt lava, part of a broader lava flow. These flows were erupted about 300,000 years ago following basalt dike intrusions in a rear-arc region of northern California. The eruptions of three of these flows are thought to have taken place within several hundred years of each other.

March 28, 2019

PubTalk 3/2019 - Land Subsidence

Title: Land Subsidence: The Lowdown on the Draw-down

The link between groundwater use and sinking landscapes

  • What is land subsidence, where does it happen, and why does it matter?
  • How do weather and land use affect land subsidence in California?
  • Why are we optimistic about the future of land subsidence in California?
An enormous rock in the ocean viewed from above, with the coast behind and sunlight on the water.
March 22, 2019

Morro Bay from the air

Passing Morro Bay during an aerial photographic survey.

The Seabird Studies Team at the USGS Western Ecological Research Center is conducting aerial photographic surveys of the ocean off central and southern California to create comprehensive maps of seabird and marine mammal distributions.

A green landmass on the coast in the background behind the wing of a small airplane.
March 21, 2019

Passing Diablo Canyon Power Plant during aerial survey test flight

Passing Diablo Canyon Power Plant during a test flight in March 2019, in preparation for aerial photographic surveys.

The Seabird Studies Team at the USGS Western Ecological Research Center is conducting aerial photographic surveys of the ocean off central and southern California to create comprehensive maps of seabird and marine mammal distributions.

Adaptive Management Forum
February 28, 2019

Adaptive Management Forum Brochure

Adaptive Management Forum Brochure.This conference was held at the University of California, Davis on February 5-6, 2019.

Rain clouds and red sky over the Northern Bristol Mountains in the Mojave Desert, California
February 14, 2019

Twilight in the Northern Bristol Mountains

Rain clouds at twilight over the Norhtern Bristol Mountains. THese types of winter storms provide water to the desert ecosystem, but are not usually intense enough to transport sediment or do other geomorphic work. This image was captured during geologic mapping of surficial geologic materials in order to better understand the Quaternary (younger than ~2.5 million years)

...
A pole has two shaded cameras mounted on it and they are pointing at a beach from high up on a grassy bluff.
December 31, 2018

Sunset State Beach webcams

USGS Pacific Coastal and Marine Science Center in Santa Cruz, California installed these video cameras which collect imagery every half hour for 10 minutes. The images are stored in the cloud and are used to study coastal variations through time, like wave, shoreline, and sandbar dynamics.

Brown landscape with volcano in the background
December 31, 2018

Mount Shasta, a steep-sided Cascade Range stratovolcano in Northern Ca

Mount Shasta, a steep-sided Cascade Range stratovolcano in Northern California, looms above Little Glass Mountain, a thick obsidian flow erupted from the Medicine Lake shield volcano about 1,000 years ago. These are just two of the young volcanic areas monitored by the USGS California Volcano Observatory. USGS photo.

examples of fieldwork done in the Sacramento-San Joaquin River Delta
December 31, 2018

Fieldwork in California’s Sacramento-San Joaquin River Delta

Top row, left to right: Cordell Johnson (left) and Evan Dailey use the USGS R/V Fast Eddy to collect water samples. Cordell Johnson (left) and Jessie Lacy prepare to deploy a tripod holding instruments to measure water level, currents, and suspended sediment. USGS divers Jenny McKee (left) and Tim Elfers assemble the gear they will need to measure vegetation

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Clark's Grebe at Thermalito Afterbay, CA
January 24, 2017

A new study published in PLOS ONE demonstrates that current conservation planning efforts for waterbird habitat in the Central Valley can likely compensate for habitat loss through the middle of the century.

Scientist collects samples from a temporary wooden platform in a New Jersey salt marsh
January 24, 2017

If coastal salt marshes are like savings accounts, with sediment as the principal, all eight Atlantic and Pacific coast salt marshes studied are "in the red," researchers found.

head shot of man
January 19, 2017

The U.S. Geological Survey is pleased to announce the selection of Dr. Guy Gelfenbaum as the new director of their Pacific Coastal and Marine Science Center in Santa Cruz, California Gelfenbaum succeeds Dr. Robert Rosenbauer who held the position for the past six years. Rosenbauer is retiring to a Scientist Emeritus position.

Photo of a young girl drinking water, which likely originated from groundwater sources. 
January 19, 2017

A regional assessment of untreated groundwater in the Basin and Range basin-fill aquifers, which include parts of Nevada, California, Arizona, Utah and adjacent states, is now available from the U.S. Geological Survey.

Man in orange safety suit and helmet, and thumb up,  standing while riding a personal watercraft
January 12, 2017

On January 13, scientists from the U.S. Geological Survey will be working on the beach in Santa Cruz at the mouth of the San Lorenzo River. Using a sonar-equipped boat and personal watercraft, they will be surveying the beach and the nearby ocean bottom to compile a three-dimensional map of how the beach changed during storms that struck this week.

USGS: Science for a changing world
January 10, 2017

The U.S. Geological Survey’s California Water Science Center is hosting a media event Wednesday, Jan. 11 at a USGS streamgage location about 7 miles north of Santa Cruz, California. A hydrologist will be available for interviews as field crews collect streamflow data.

 

Image: USGS Logo
January 8, 2017

The U.S. Geological Survey’s California Water Science Center is hosting a media event Monday, Jan. 9 at a USGS streamgage location below Friant Dam, a streamflow site with significance to the San Juan River Restoration Project.

A man sits at a desk in front of a computer monitor and keyboard, pointing to the image and talking.
December 30, 2016

USGS scientists and their coauthors from the California Coastal Records Project have found a way to use historical aerial photographs not just to see evidence of coastal erosion, but to accurately measure how much has occurred over time.

Nevada Earthquake Swarm December 28, 2016...
December 28, 2016

Three jolting earthquakes occurred in the wee hours this morning near Hawthorne NV, with two M5.7 events and a M5.5 occurring between the hours of 12:18 AM PST and 1:13 AM PST.

December 13 - 14, 2016 Long Valley Caldera earthquake swarm recorde...
December 14, 2016

A short-lived earthquake swarm occurred overnight under the Long Valley Caldera in eastern California about 4 km (2.5 mi) ESE of the town of Mammoths Lakes. The swarm does not appear to be related to increased volcanic unrest.

Image: AGU Fall Meeting Street Pedestrians
December 8, 2016

Their days often start with breakfast meetings and end with working dinners. They give presentations to hundreds of their peers, debate fine points in crowded poster halls, and catch up with colleagues in long refreshment lines.

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