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Filter Total Items: 355
Submerged hydrophone near bank of the San Joaquin River
Date Published: December 10, 2018
Status: Active

Surrogate Monitoring of Sediment Transport using Hydrophones along the San Joaquin River and Tributaries

Traditional methods for measuring coarse bedload sediment transport by discrete physical sampling tend to be labor intensive and expensive (Gray and others, 2010). As such, bedload samples often are collected too infrequently to capture the temporal variability inherent in transport rates, which can vary significantly, sometimes by a factor of ten or more, over time periods of...

3-D Geologic Map
Date Published: December 10, 2018
Status: Active

Geologic Mapping in the Southern Pacific Border and Sierras provinces, California

 

This project uses geologic and geophysical mapping to build an earth-science framework for scientific investigations that include assessments of critical resources, such as groundwater, and of hazards, such as those resulting from earthquakes, in California west of and including the Sierra Nevada and Cascade arc.  

 

Questions of particular...

All-American Canal winding through the Imperial Sand Dunes
Date Published: December 10, 2018
Status: Active

Forecasting Total Dissolved Solids Concentrations of Groundwater from the Lower Colorado Water Supply Project

The All-American Canal (AAC) in southern Imperial County, California, has historically been unlined, resulting in substantial losses to seepage. In 2006, the Imperial Irrigation District (IID), under a contract with the United States Bureau of Reclamation (Reclamation), initiated a project to build a concrete-lined canal parallel to 23 miles of the earthen AAC. Construction was completed in...

Bridge over Santa Ana River
Date Published: December 7, 2018
Status: Completed

Pathogen Total Maximum Daily Loads Modeling in the Chino Basin

The Santa Ana River in Southern California is the primary water supply for approximately 2 million people. The main constituent of regulatory concern is pathogens that have impaired the use of waters for the beneficial uses of warm freshwater habitat and noncontact water recreation. Pathogen loadings from the tributary watershed flows into lakes and streams leading into the Santa Ana River....

Contacts: John Izbicki
Black & white photo of two USGS scientists conducting spirit leveling in the field
Date Published: December 7, 2018
Status: Active

Spirit Leveling

Elevation or elevation-change measurements are fundamental to monitoring land subsidence, and have been measured by using interferometric synthetic aperture radar (InSAR), continuous GPS (CGPS) measurements, campaign global positioning system (GPS) surveying, and spirit-leveling surveying. The most precise measurements tend to be made using spirit-leveling surveys and extensometers. 

...

Contacts: Michelle Sneed
Illustration of a subsidence cone with an interferogram underneath it.
Date Published: December 7, 2018
Status: Active

Interferometric Synthetic Aperture Radar (InSAR)

Interferometric Synthetic Aperture Radar (InSAR) is an effective way to measure changes in land surface altitude. InSAR makes high-density measurements over large areas by using radar signals from Earth-orbiting satellites to measure changes in land-surface altitude at high degrees of measurement resolution and spatial detail (Galloway and others, 2000).

Synthetic Aperture...

Contacts: Michelle Sneed
USGS
Date Published: December 7, 2018
Status: Completed

Sedimentation in the Lower Laguna-Mark West Drainage

The Sonoma County Water Agency (SCWA) and the San Francisco District office of the U.S. Army Corps of Engineers (CORPS) have identified issues associated with sedimentation in the lower Laguna de Santa Rosa and Mark West Creek in Sonoma County. Human activities in the watershed over the last 200 years have accelerated erosion and sediment delivery to the Laguna reducing the water storage...

Map of land subsidence in the Sacramento-San Joaquin Delta, shaded by feet below sea level
Date Published: December 6, 2018
Status: Active

Subsidence in the Sacramento-San Joaquin Delta

The Sacramento-San Joaquin Delta is part of the San Francisco Estuary, home to a diverse flora and fauna, including several threatened and endangered species, has a large area of prime farmland, and serves as the hub of California's freshwater-delivery system that moves water from the wet north to the dry southern part of the State.

Province 5018 Western Great Basin National Oil and Gas Assessments
Date Published: December 6, 2018
Status: Active

Western Great Basin Oil and Gas Assessments

The U.S. Geological Survey completed the following assessments of undiscovered continuous oil and gas resources of the Western Great Basin Province 5018:

 

Image of an underwater diver.
Date Published: December 6, 2018
Status: Active

Assessment of environmental impacts of mercury treatability test using suction dredging, South Yuba River

The goals of the BLM suction dredging treatability study are to (1) assess the effectiveness of suction dredging in removing mercury from the environment and (2) assess potential impacts of suction dredging with regard to discharging mercury-contaminated suspended sediment to the aquatic environment.

Contacts: Jacob A Fleck
USGS
Date Published: December 6, 2018
Status: Completed

Mercury and Dissolved Organic Matter in Delta Wetlands

Between 1860 and 1914, hydraulic mining activities sent more than 800,000,000 cubic yards of mercury-laden sediment into the Delta altering the landscape, water flows, and contributing to the leveeing and reclamation of the Delta's marshes. Transport of mercury from historic mining areas continues today. The sedimentary supply of mercury to the Delta and in Delta sediments (cinnabar,...

Map of the Santa Clara Valley
Date Published: December 4, 2018
Status: Completed

Management Tools For The Hydrologic Model Of Santa Clara Valley, California

Groundwater flow model of the Santa Clara Valley.

Filter Total Items: 315
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 maximum depth of flooding (cm) in the region landward of the present-day shoreline for the sea-level rise (SLR) and storm condition indicated.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenari

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) scenarios. Projections for CoSMo

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) scenarios. Projections for CoSMo

USGS
January 1, 2019

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-induced coastal flooding and er

USGS
January 1, 2019

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. 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 meters.

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. Projections for CoSMoS v3.1 in Cen

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 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) scenarios. Projections for CoSMo

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. Projections for CoSMoS v3.1 in Cen

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) scenarios. Projections for CoSMo

USGS
January 1, 2019

This data set includes field data for fishes sampled using gill nets and otter trawls during daylight hours in and around Ryer Island, Suisun Bay, California. This data release includes all measured environmental parameters and fish taxa included in the analysis.

Map of a western coastline with stretches of the coast labeled to identify data set regions.
January 1, 2019

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-induced coastal flooding and er

USGS
January 1, 2019

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 UTM Zone 10 met

Filter Total Items: 311
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Year Published: 2013

Borehole-explosion and air-gun data acquired in the 2011 Salton Seismic Imaging Project (SSIP), southern California: description of the survey

The Imperial and Coachella Valleys are being formed by active plate-tectonic processes. From the Imperial Valley southward into the Gulf of California, plate motions are rifting the continent apart. In the Coachella Valley, the plates are sliding past one another along the San Andreas and related faults (fig. 1). These processes build the stunning...

Rose, Elizabeth J.; Fuis, Gary S.; Stock, Joann M.; Hole, John A.; Kell, Annie M.; Kent, Graham; Driscoll, Neal W.; Goldman, Mark; Reusch, Angela M.; Han, Liang; Sickler, Robert R.; Catchings, Rufus D.; Rymer, Michael J.; Criley, Coyn J.; Scheirer, Daniel S.; Skinner, Steven M.; Slayday-Criley, Coye J.; Murphy, Janice M.; Jensen, Edward G.; McClearn, Robert; Ferguson, Alex J.; Butcher, Lesley A.; Gardner, Max A.; Emmons, Iain D.; Loughran, Caleb L.; Svitek, Joseph R.; Bastien, Patrick C.; Cotton, Joseph A.; Croker, David S.; Harding, Alistair J.; Babcock, Jeffrey M.; Harder, Steven H.; Rosa, Carla M.
Borehole-explosion and air-gun data acquired in the 2011 Salton Seismic Imaging Project (SSIP), southern California: description of the survey; 2013; OFR; 2013-1172; Rose, Elizabeth J.; Fuis, Gary S.; Stock, Joann M.; Hole, John A.; Kell, Annie M.; Kent, Graham; Driscoll, Neal W.; Goldman, Mark; Reusch, Angela M.; Han, Liang; Sickler, Robert R.; Catchings, Rufus D.; Rymer, Michael J.; Criley, Coyn J.; Scheirer, Daniel S.; Skinner, Steven M.; Slayday-Criley, Coye J.; Murphy, Janice M.; Jensen, Edward G.; McClearn, Robert; Ferguson, Alex J.; Butcher, Lesley A.; Gardner, Max A.; Emmons, Iain; Loughran, Caleb L.; Svitek, Joseph R.; Bastien, Patrick C.; Cotton, Joseph A.; Croker, David S.; Harding, Alistair J.; Babcock, Jeffrey M.; Harder, Steven H.; Rosa, Carla M.

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Year Published: 2013

Emergency assessment of post-fire debris-flow hazards for the 2013 Rim Fire, Stanislaus National Forest and Yosemite National Park, California

Wildfire can significantly alter the hydrologic response of a watershed to the extent that even modest rainstorms can produce dangerous flash floods and debris flows. In this report, empirical models are used to predict the probability and magnitude of debris-flow occurrence in response to a 10-year rainstorm for the 2013 Rim fire in Yosemite...

Staley, Dennis M.
Emergency assessment of post-fire debris-flow hazards for the 2013 Rim Fire, Stanislaus National Forest and Yosemite National Park, California; 2013; OFR; 2013-1260; Staley, Dennis M.

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Year Published: 2013

Emergency assessment of post-fire debris-flow hazards for the 2013 Powerhouse fire, southern California

Wildfire dramatically alters the hydrologic response of a watershed such that even modest rainstorms can produce dangerous flash floods and debris flows. Existing empirical models were used to predict the probability and magnitude of debris-flow occurrence in response to a 10-year recurrence interval rainstorm for the 2013 Powerhouse fire near...

Staley, Dennis M.; Smoczyk, Gregory M.; Reeves, Ryan R.
Emergency assessment of post-fire debris-flow hazards for the 2013 Powerhouse fire, southern California; 2013; OFR; 2013-1248; Staley, Dennis M.; Smoczyk, Gregory M.; Reeves, Ryan R.

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Year Published: 2013

Emergency assessment of post-fire debris-flow hazards for the 2013 Mountain fire, southern California

Wildfire dramatically alters the hydrologic response of a watershed such that even modest rainstorms can produce dangerous flash floods and debris flows. We use empirical models to predict the probability and magnitude of debris flow occurrence in response to a 10-year rainstorm for the 2013 Mountain fire near Palm Springs, California. Overall,...

Staley, Dennis M.; Gartner, Joseph E.; Smoczyk, Greg M.; Reeves, Ryan R.
Emergency assessment of post-fire debris-flow hazards for the 2013 Mountain fire, southern California; 2013; OFR; 2013-1249; Staley, Dennis M.; Gartner, Joseph E.; Smoczyk, Greg M.; Reeves, Ryan R.

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Year Published: 2013

Characterizing and estimating noise in InSAR and InSAR time series with MODIS

InSAR time series analysis is increasingly used to image subcentimeter displacement rates of the ground surface. The precision of InSAR observations is often affected by several noise sources, including spatially correlated noise from the turbulent atmosphere. Under ideal scenarios, InSAR time series techniques can substantially mitigate these...

Barnhart, William D.; Lohman, Rowena B.
Characterizing and estimating noise in InSAR and InSAR time series with MODIS; 2013; Article; Journal; Geochemistry, Geophysics, Geosystems; Barnhart, William D.; Lohman, Rowena B.

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Year Published: 2013

Runoff-generated debris flows: observations and modeling of surge initiation, magnitude, and frequency

Runoff during intense rainstorms plays a major role in generating debris flows in many alpine areas and burned steeplands. Yet compared to debris flow initiation from shallow landslides, the mechanics by which runoff generates a debris flow are less understood. To better understand debris flow initiation by surface water runoff, we monitored flow...

Kean, Jason W.; McCoy, Scott W.; Tucker, Gregory E.; Staley, Dennis M.; Coe, Jeffrey A.
Runoff-generated debris flows: observations and modeling of surge initiation, magnitude, and frequency; 2013; Article; Journal; Journal of Geophysical Research: Earth Surface; Kean, Jason W.; McCoy, Scott W.; Tucker, Gregory E.; Staley, Dennis M.; Coe, Jeffrey A.

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Year Published: 2013

Effects of stock use and backpackers on water quality in wilderness in Sequoia and Kings Canyon National Parks, USA

During 2010-2011, a study was conducted in Sequoia and Kings Canyon National Parks (SEKI) to evaluate the influence of pack animals (stock) and backpackers on water quality in wilderness lakes and streams. The study had three main components: (1) a synoptic survey of water quality in wilderness areas of the parks, (2) paired water-quality...

Clow, David W.; Forrester, Harrison; Miller, Benjamin; Roop, Heidi; Sickman, James O.; Ryu, Hodon; Santo Domingo, Jorge
Effects of stock use and backpackers on water quality in wilderness in Sequoia and Kings Canyon National Parks, USA; 2013; Article; Journal; Environmental Management; Clow, David W.; Forrester, Harrison; Miller, Benjamin; Roop, Heidi; Sickman, James O.; Ryu, Hodon; Santo Domingo, Jorge

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Year Published: 2013

Whole-body concentrations of elements in three fish species from offshore oil platforms and natural areas in the Southern California Bight, USA

There is concern that offshore oil platforms off Southern California may be contributing to environmental contaminants accumulated by marine fishes. To examine this possibility, 18 kelp bass (Paralabrax clathratus Girard, 1854), 80 kelp rockfish (Sebastes atrovirens Jordan and Gilbert, 1880), and 98 Pacific sanddab (Citharichthys sordidus Girard,...

Love, Milton S.; Saiki, Michael K.; May, Thomas W.; Yee, Julie L.
Whole-body concentrations of elements in three fish species from offshore oil platforms and natural areas in the Southern California Bight, USA; 2013; Article; Journal; Bulletin of Marine Science; Love, Milton S.; Saiki, Michael K.; May, Thomas W.; Yee, Julie L.

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Year Published: 2013

Infrequent triggering of tremor along the San Jacinto Fault near Anza, California

We examine the conditions necessary to trigger tremor along the San Jacinto fault (SJF) near Anza, California, where previous studies suggest triggered tremor occurs, but observations are sparse. We investigate the stress required to trigger tremor using continuous broadband seismograms from 11 stations located near Anza, California. We examine 44...

Wang, Tien-Huei; Cochran, Elizabeth S.; Agnew, Duncan Carr; Oglesby, David D.
Infrequent triggering of tremor along the San Jacinto Fault near Anza, California; 2013; Article; Journal; Bulletin of the Seismological Society of America; Wang, Tien-Huei ; Cochran, Elizabeth S.; Agnew, Duncan ; Oglesby, David D.

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Year Published: 2013

Age and condition of juvenile catostomids in Clear Lake Reservoir, California

Executive Summary Although infrequent recruitment of new individuals into the adult spawning populations of Lost River suckers (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) limits recovery of these species in Upper Klamath Lake, it is not clear that populations are recruitment limited in Clear Lake Reservoir (hereafter Clear...

Burdick, Summer M.; Rasmussen, Josh

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Year Published: 2013

Geometry and earthquake potential of the shoreline fault, central California

The Shoreline fault is a vertical strike‐slip fault running along the coastline near San Luis Obispo, California. Much is unknown about the Shoreline fault, including its slip rate and the details of its geometry. Here, I study the geometry of the Shoreline fault at seismogenic depth, as well as the adjacent section of the offshore Hosgri fault,...

Hardebeck, Jeanne L.
Geometry and earthquake potential of the shoreline fault, central California; 2013; Article; Journal; Bulletin of the Seismological Society of America; Hardebeck, Jeanne L.

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Year Published: 2013

The Regional Salmon Outmigration Study--survival and migration routing of juvenile Chinook salmon in the Sacramento-San Joaquin River Delta during the winter of 2008-09

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

Romine, Jason G.; Perry, Russell W.; Brewer, Scott J.; Adams, Noah S.; Liedtke, Theresa L.; Blake, Aaron R.; Burau, Jon R.
The Regional Salmon Outmigration Study--survival and migration routing of juvenile Chinook salmon in the Sacramento-San Joaquin River Delta during the winter of 2008-09; 2013; OFR; 2013-1142; Romine, Jason G.; Perry, Russell W.; Brewer, Scott J.; Adams, Noah S.; Liedtke, Theresa L.; Blake, Aaron R.; Burau, Jon R.

Filter Total Items: 1,035
Hill with grass and shrubs and trees regrowing after fire.
May 11, 2019

Hill at Whiskeytown National Recreation Area 9 Months After Fire

Vegetation has begun to regrow in Whiskeytown National Recreation Area 9 months after summer 2018's Carr Fire near Redding, California, where USGS WERC researchers are studying fire impacts, post-fire vegetation recovery, and post-fire erosion and debris flows.

...
Field of growing spring grasses with hill in the background.
May 11, 2019

Landscape at Whiskeytown National Recreation Area 9 Months After Fire

Vegetation has begun to regrow in Whiskeytown National Recreation Area 9 months after summer 2018's Carr Fire near Redding, California, where USGS WERC researchers are studying fire impacts, post-fire vegetation recovery, and post-fire erosion and debris flows.

...
Overhead view of a brown pelican in flight over the ocean.
April 23, 2019

Brown pelican in flight

Zoomed in view of a California Brown Pelican (Pelecanus occidentalis californicus) from an image collected during a test flight in March 2019.

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

...
Pod of dolphins, viewed from high above the ocean.
April 23, 2019

Pod of dolphins captured during aerial photographic survey

Full size image of a pod of dolphins captured during an aerial photographic survey Fall 2018.

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.

 

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.

Filter Total Items: 897
Image shows a map of U.S. states colored based on the value of their mineral industry
April 14, 2017

In 2016, these five states led the pack in mineral production, accounting for about one third of the total mineral production value for the entire country.

BART
April 6, 2017

Although no one can reliably predict earthquakes, today’s technology is advanced enough to rapidly detect seismic waves as an earthquake begins, calculate the maximum expected shaking, and send alerts to surrounding areas before damage can occur. This technology is known as “earthquake early warning” (EEW).

Earthquake Early Warning: Vital for City Transit
April 6, 2017

The U.S. Geological Survey along with university, state and private-sector partners will highlight the rollout of Version 1.2 of the USGS ShakeAlert earthquake early warning system on April 10, 2017.

Field-trip guides to selected volcanoes and volcanic landscapes of ...
April 5, 2017

California is well-known for its frequent earthquakes, but less so for its volcanic history – despite the fact that the most recent eruption in the state occurred just 100 years ago.

CalVO geologists Duane Champion and Drew Downs collect paleomagneti...
April 3, 2017

New research on the ages of the most recent lava flows at Eagle Lake Volcanic Field, California suggest they are much older than once thought, minimizing the possibility of future eruption.

house perched at the top of cliff edge above beach.
March 27, 2017

Using a newly-developed computer model called “CoSMoS-COAST” (Coastal Storm Modeling System – Coastal One-line Assimilated Simulation Tool) scientists predict that with limited human intervention, 31 to 67 percent of Southern California beaches may become completely eroded (up to existing coastal infrastructure or sea-cliffs) by the year 2100 under scenarios of sea-level rise of one to two meters.

USGS
March 20, 2017

Seal Beach, Calif.— A new collaborative study shows evidence of prior abrupt sinking of the wetlands near Seal Beach, caused by ancient earthquakes that shook the area at least three times in the past 2,000 years, according to researchers.

A picture of a restored extensometer
March 16, 2017

San Joaquin Valley: the final frontier. These are the voyages of the U.S. Geological Survey. Its weeklong mission: to explore strange new locations, to seek out abandoned scientific technologies, to boldly go where no scientist has gone before (at least in a few decades).

Wes Hildreth at Long Valley Caldera...
March 15, 2017

Two new journal articles about California Volcanoes in the eastern part of the state, the Long Valley Caldera and Ubehebe Craters, are headed to press.

Lake Mead
March 15, 2017

The Colorado River system provides about 35 million Americans with a portion of their water supply. It irrigates 5½ million acres of land in the West and provides water to tribes, parks, and wildlife. The system serves parts of seven States and Mexico—but reservoir levels have crept lower over the past several years, sparking questions about how much water remains and who will have access.

Chinook Salmon
March 13, 2017

The water in the Delta arrives primarily from the Sacramento and San Joaquin Rivers, supplying water for more than 22 million people. This water source supports California’s trillion-dollar economy—the sixth largest in the world—and its $27 billion agricultural industry.

Filter Total Items: 216