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: 377
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
Date published: October 18, 2018
Status: Active

Decomposition of Organic Soils in the Sacramento-San Joaquin Delta

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

Date published: October 18, 2018
Status: Active

Aquifer Compaction due to Groundwater Pumping

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

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

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

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

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

Land Subsidence in the San Joaquin Valley

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

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

Debris-Flow Forecasts Before Wildfires

Release Date: OCTOBER 15, 2018

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

Date published: October 3, 2018
Status: Active

Implementing New Acoustic Monitoring Techniques in the Trinity River

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

Date published: August 30, 2018
Status: Active

Yucaipa Subbasin Integrated Hydrologic Model

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

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

Microbial Biogeochemistry Laboratory — Menlo Park, California

About the Laboratory

Microbiologists at the Microbial Biogeochemistry Laboratory develop and apply innovative methods to measure key microbial processes. These methods are used to better understand how major biogeochemical cycles (carbon, nitrogen, sulfur, and iron) interact with and control the speciation and fate of metals like mercury and selenium which can impact...

Filter Total Items: 501
Date published: January 1, 2019

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

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

Date published: January 1, 2019

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

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

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

Date published: January 1, 2019

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

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

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 water-level projections: 100-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 wave-hazard projections: 20-year storm in San Francisco County

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

Date published: January 1, 2019

Structure-from-motion point cloud of Mud Creek, Big Sur, California, 2017-03-08

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

Date published: January 1, 2019

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

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

Date published: January 1, 2019

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

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

Date published: January 1, 2019

Isopachs--Punta Gorda to Point Arena, California

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

Date published: January 1, 2019

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

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

Filter Total Items: 350
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Year Published: 2008

Conditional, time-dependent probabilities for segmented Type-A faults in the WGCEP UCERF 2

This appendix presents elastic-rebound-theory (ERT) motivated time-dependent probabilities, conditioned on the date of last earthquake, for the segmented type-A fault models of the 2007 Working Group on California Earthquake Probabilities (WGCEP). These probabilities are included as one option in the WGCEP?s Uniform California Earthquake Rupture...

Field, Edward H.; Gupta, Vipin
Conditional, Time-Dependent Probabilities for Segmented Type-A Faults in the WGCEP UCERF 2; 2008; OFR; 2007-1437-N; Appendix N in The Uniform California Earthquake Rupture Forecast, Version 2 (UCERF 2); Field, Edward H.; Gupta, Vipin

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Year Published: 2008

Paleoseismic Investigations of the Walnut Site on the San Jacinto Fault

The Walnut paleoseismic site is located along the northern San Jacinto fault about 3 km southeast of the San Bernardino, California city center (Figures 1, 2). More than 340 meters of trenches were excavated across the fault zone at this site as part of an Alquist-Priolo fault study (Figure 3). We photographed and logged the SE wall and most of...

Fumal, T.E.; Kendrick, K.J.
Paleoseismic Investigations of the Walnut Site on the San Jacinto Fault; 2008; OFR; 2007-1437-O; Appendix O in The Uniform California Earthquake Rupture Forecast, Version 2 (UCERF 2); Fumal, T. E.; Kendrick, K. J.

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Year Published: 2008

Calculating California seismicity rates

Empirically the rate of earthquakes = magnitude M is well fit by the Gutenberg-Richter relationship, logN=a-bM (1) where N is the number of earthquakes = M over a given time period, a is the number of M = 0 earthquakes over the same period, and b is a parameter that determines the ratio of larger to smaller earthquakes (Ishimoto and Iida 1939;...

Felzer, Karen R.
Calculating California Seismicity Rates; 2008; OFR; 2007-1437-I; Appendix I in The Uniform California Earthquake Rupture Forecast, Version 2 (UCERF 2); Felzer, Karen R.

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Year Published: 2008

California fault parameters for the National Seismic Hazard Maps and Working Group on California Earthquake Probabilities 2007

This report describes development of fault parameters for the 2007 update of the National Seismic Hazard Maps and the Working Group on California Earthquake Probabilities (WGCEP, 2007). These reference parameters are contained within a database intended to be a source of values for use by scientists interested in producing either seismic hazard or...

Wills, Chris J.; Weldon, Ray J.; Bryant, W.A.
California Fault Parameters for the National Seismic Hazard Maps and Working Group on California Earthquake Probabilities 2007; 2008; OFR; 2007-1437-A; Appendix A in The Uniform California Earthquake Rupture Forecast, Version 2 (UCERF 2); Wills, Chris J.; Weldon, Ray J., II; Bryant, W. A.

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Year Published: 2008

Development of final a-fault rupture models for WGCEP/ NSHMP Earthquake Rate Model 2

This appendix discusses how we compute the magnitude and rate of earthquake ruptures for the seven Type-A faults (Elsinore, Garlock, San Jacinto, S. San Andreas, N. San Andreas, Hayward-Rodgers Creek, and Calaveras) in the WGCEP/NSHMP Earthquake Rate Model 2 (referred to as ERM 2. hereafter). By definition, Type-A faults are those that have...

Field, Edward H.; Weldon, Ray J.; Parsons, Thomas; Wills, Chris J.; Dawson, Timothy E.; Stein, Ross S.; Petersen, Mark D.
Development of Final A-Fault Rupture Models for WGCEP/ NSHMP Earthquake Rate Model 2; 2008; OFR; 2007-1437-G; Appendix G in The Uniform California Earthquake Rupture Forecast, Version 2 (UCERF 2); Field, Edward H.; Weldon, Ray J., II; Parsons, Thomas; Wills, Chris J.; Dawson, Timothy E.; Stein, Ross S.; Petersen, Mark D.

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Year Published: 2008

Earthquake Rate Model 2 of the 2007 working group for California earthquake probabilities, magnitude-area relationships

The Working Group for California Earthquake Probabilities must transform fault lengths and their slip rates into earthquake moment-magnitudes. First, the down-dip coseismic fault dimension, W, must be inferred. We have chosen the Nazareth and Hauksson (2004) method, which uses the depth above which 99% of the background seismicity occurs to assign...

Stein, Ross S.
Earthquake Rate Model 2 of the 2007 Working Group for California Earthquake Probabilities, Magnitude-Area Relationships; 2008; OFR; 2007-1437-D; Appendix D in The Uniform California Earthquake Rupture Forecast, Version 2 (UCERF 2); Stein, Ross S.

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Year Published: 2008

Monte Carlo method for determining earthquake recurrence parameters from short paleoseismic catalogs: Example calculations for California

Paleoearthquake observations often lack enough events at a given site to directly define a probability density function (PDF) for earthquake recurrence. Sites with fewer than 10-15 intervals do not provide enough information to reliably determine the shape of the PDF using standard maximum-likelihood techniques [e.g., Ellsworth et al., 1999]. In...

Parsons, Tom
Monte Carlo Method for Determining Earthquake Recurrence Parameters from Short Paleoseismic Catalogs: Example Calculations for California; 2008; OFR; 2007-1437-C; Appendix C in The Uniform California Earthquake Rupture Forecast, Version 2 (UCERF 2); Parsons, Tom

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Year Published: 2008

Overview of the Southern San Andreas Fault Model

This appendix summarizes the data and methodology used to generate the source model for the southern San Andreas fault. It is organized into three sections, 1) a section by section review of the geological data in the format of past Working Groups, 2) an overview of the rupture model, and 3) a manuscript by Biasi and Weldon (in review Bulletin of...

Weldon, Ray J.; Biasi, Glenn P.; Wills, Chris J.; Dawson, Timothy E.
Overview of the Southern San Andreas Fault Model; 2008; OFR; 2007-1437-E; Appendix E in The Uniform California Earthquake Rupture Forecast, Version 2 (UCERF 2); Weldon, Ray J., II; Biasi, Glenn P.; Wills, Chris J.; Dawson, Timothy E.

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Year Published: 2008

Summary of geologic data and development of A Priori Rupture Models for the Elsinore, San Jacinto, and Garlock faults

This appendix to the WGCEP Earthquake Rate Model 2 summarizes geologic data and documents the development of the rupture models for the Elsinore, San Jacinto, and Garlock faults. For the summary of available geologic data, the documentation is organized by fault and fault segment and includes a summary of slip rates, event timing and recurrence,...

Dawson, Timothy E.; Rockwell, Tom K.; Weldon, Ray J.; Wills, Chris J.
Summary of Geologic Data and Development of A Priori Rupture Models for the Elsinore, San Jacinto, and Garlock Faults; 2008; OFR; 2007-1437-F; Appendix F in The Uniform California Earthquake Rupture Forecast, Version 2 (UCERF 2); Dawson, Timothy E.; Rockwell, Tom K.; Weldon, Ray J., II; Wills, Chris J.

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Year Published: 2008

WGCEP historical California earthquake catalog

This appendix provides an earthquake catalog for California and the surrounding area. Our goal is to provide a listing for all known M > 5.5 earthquakes that occurred from 1850-1932 and all known M > 4.0 earthquakes that occurred from 1932-2006 within the region of 31.0 to 43.0 degrees North and -126.0 to -114.0 degrees West. Some pre-1932...

Felzer, Karen R.; Cao, Tianqing
WGCEP Historical California Earthquake Catalog; 2008; OFR; 2007-1437-H; Appendix H in The Uniform California Earthquake Rupture Forecast, Version 2 (UCERF 2); Felzer, Karen R.; Cao, Tianqing

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Year Published: 2008

Modified Mercalli Intensity Maps for the 1868 Hayward Earthquake Plotted in ShakeMap Format

To construct the Modified Mercalli Intensity (MMI) ShakeMap for the 1868 Hayward earthquake, we started with two sets of damage descriptions and felt reports. The first set of 100 sites was compiled by A.A. Bullock in the Lawson (1908) report on the 1906 San Francisco earthquake. The second set of 45 sites was compiled by Toppozada et al. (1981)...

Boatwright, John; Bundock, Howard
Modified Mercalli Intensity Maps for the 1868 Hayward Earthquake Plotted in ShakeMap Format; 2008; OFR; 2008-1121; Boatwright, John; Bundock, Howard

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Year Published: 2008

Forecasting California's earthquakes: What can we expect in the next 30 years?

In a new comprehensive study, scientists have determined that the chance of having one or more magnitude 6.7 or larger earthquakes in the California area over the next 30 years is greater than 99%. Such quakes can be deadly, as shown by the 1989 magnitude 6.9 Loma Prieta and the 1994 magnitude 6.7 Northridge earthquakes. The likelihood of at least...

Field, Edward H.; Milner, Kevin R.
Forecasting California's Earthquakes - What Can We Expect in the Next 30 Years?; 2008; FS; 2008-3027; Field, Edward H.; Milner, Kevin R.; The 2007 Working Group on California Earthquake Probabilities

Filter Total Items: 961
Vegetation in foreground up on a beach bluff above flat beach with waves.
May 23, 2018

Sunset State Beach Video Camera 2 snapshot

Two video cameras overlook the coast at Sunset State Beach in Watsonville, California. Camera 1 looks northwest while Camera 2 looks north. Every half hour during daylight hours, the cameras collect snapshots and video for 10 minutes. The various imagery collected:

  • Snapshot: first frame of the video, just like a standard photo
  • Timex (time-exposure):
...
Vegetation in foreground up on a beach bluff above flat beach with waves.
May 23, 2018

Sunset State Beach Video Camera 2 time-exposure

Two video cameras overlook the coast at Sunset State Beach in Watsonville, California. Camera 1 looks northwest while Camera 2 looks north. Every half hour during daylight hours, the cameras collect snapshots and video for 10 minutes. The various imagery collected:

  • Snapshot: first frame of the video, just like a standard photo
  • Timex (time-exposure):
...
Vegetation in foreground up on a beach bluff above flat beach with waves.
May 23, 2018

Sunset State Beach Video Camera 2 variance image

Two video cameras overlook the coast at Sunset State Beach in Watsonville, California. Camera 1 looks northwest while Camera 2 looks north. Every half hour during daylight hours, the cameras collect snapshots and video for 10 minutes. The various imagery collected:

  • Snapshot: first frame of the video, just like a standard photo
  • Timex (time-exposure):
...
Vegetation in foreground up on a beach bluff above flat beach with waves.
May 23, 2018

Sunset State Beach Video Camera 1 bright image

Two video cameras overlook the coast at Sunset State Beach in Watsonville, California. Camera 1 looks northwest while Camera 2 looks north. Every half hour during daylight hours, the cameras collect snapshots and video for 10 minutes. The various imagery collected:

  • Snapshot: first frame of the video, just like a standard photo
  • Timex (time-exposure):
...
Coastal flowers in foreground up on a beach bluff above flat beach with waves gently lapping, sky is cloudy in the distance.
May 23, 2018

Sunset State Beach Video Camera 1 Snapshot

Image from video camera overlook the coast at Sunset State Beach in Watsonville, CA. Every half hour during daylight hours, the camera shoots video for 10 minutes. This snapshot is the first frame in the 10-minute sequence.

Vegetation in foreground up on a beach bluff above flat beach with waves.
May 23, 2018

Sunset State Beach Video Camera 1 dark image

Two video cameras overlook the coast at Sunset State Beach in Watsonville, California. Camera 1 looks northwest while Camera 2 looks north. Every half hour during daylight hours, the cameras collect snapshots and video for 10 minutes. The various imagery collected:

  • Snapshot: first frame of the video, just like a standard photo
  • Timex (time-exposure):
...
Vegetation in foreground up on a beach bluff above flat beach with waves.
May 23, 2018

Sunset State Beach Video Camera 1 snapshot

Two video cameras overlook the coast at Sunset State Beach in Watsonville, California. Camera 1 looks northwest while Camera 2 looks north. Every half hour during daylight hours, the cameras collect snapshots and video for 10 minutes. The various imagery collected:

  • Snapshot: first frame of the video, just like a standard photo
  • Timex (time-exposure):
...
Vegetation in foreground up on a beach bluff above flat beach with waves.
May 23, 2018

Sunset State Beach Video Camera 1 time-exposure

Two video cameras overlook the coast at Sunset State Beach in Watsonville, California. Camera 1 looks northwest while Camera 2 looks north. Every half hour during daylight hours, the cameras collect snapshots and video for 10 minutes. The various imagery collected:

  • Snapshot: first frame of the video, just like a standard photo
  • Timex (time-exposure):
...
Vegetation in foreground up on a beach bluff above flat beach with waves.
May 23, 2018

Sunset State Beach Video Camera 1 variance image

Two video cameras overlook the coast at Sunset State Beach in Watsonville, California. Camera 1 looks northwest while Camera 2 looks north. Every half hour during daylight hours, the cameras collect snapshots and video for 10 minutes. The various imagery collected:

  • Snapshot: first frame of the video, just like a standard photo
  • Timex (time-exposure):
...
Vegetation in foreground up on a beach bluff above flat beach with waves.
May 23, 2018

Sunset State Beach Video Camera 2 bright image

Two video cameras overlook the coast at Sunset State Beach in Watsonville, California. Camera 1 looks northwest while Camera 2 looks north. Every half hour during daylight hours, the cameras collect snapshots and video for 10 minutes. The various imagery collected:

  • Snapshot: first frame of the video, just like a standard photo
  • Timex (time-exposure):
...
Vegetation in foreground up on a beach bluff above flat beach with waves.
May 23, 2018

Sunset State Beach Video Camera 2 dark image

Two video cameras overlook the coast at Sunset State Beach in Watsonville, California. Camera 1 looks northwest while Camera 2 looks north. Every half hour during daylight hours, the cameras collect snapshots and video for 10 minutes. The various imagery collected:

  • Snapshot: first frame of the video, just like a standard photo
  • Timex (time-exposure):
...
Giant gartersnake (Thamnophis gigas)
May 14, 2018

Threatened Giant Gartersnake (Thamnophis gigas)

Threatened giant gartersnake (Thamnophis gigas). This semi-aquatic snake lives in rice fields and the remaining wetlands of California's Central Valley.

Filter Total Items: 925
USGS science for a changing world logo
September 10, 2015

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

Image: USGS Documents 2015 Drought
September 8, 2015

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

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

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

Image: Moon over Half Dome
September 7, 2015

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

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

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

imaging from Mars
September 2, 2015

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

Image: Drakes Peak
August 24, 2015

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

August lecture flyer thumbnail
August 24, 2015

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

Image: Baby Spider Monkey Snacking While Clinging to Mom
August 20, 2015

In a paper released today in Science, a new model presents a common mathematical structure that underlies the full range of feeding strategies of plants and animals: from familiar parasites, predators, and scavengers to more obscure parasitic castrators and decomposers. Now ecologists can view all food-web interactions through the same lens using a common language to understand the natural world.

Image: Elevation Field Work at Bandon Marsh
August 14, 2015

The U.S. Geological Survey and Oregon State University released a report this week examining Pacific Northwest tidal wetland vulnerability to sea level rise. Scientists found that, while vulnerability varies from marsh to marsh, most wetlands would likely be resilient to rising sea levels over the next 50-70 years.

Image: Nearshore Algae
August 12, 2015

The U.S. Geological Survey and the University of Nevada, Reno, will study the cause of eutrophication, or increased algae growth, along the nearshore of Lake Tahoe. Supported by California’s Lahontan Water Quality Control Board, the investigation is in response to widespread concerns with water quality and ecological degradation of the lake’s nearshore environment.

USGS
August 4, 2015

A new study now underway by the U.S. Geological Survey is exploring the groundwater resources and geothermal energy potential in drought-stricken areas of eastern Oregon and nearby parts of California, Idaho and Nevada.

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