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Filter Total Items: 363
Trona Wildrose Road in the Panamint Valley, California, along the section of the seismic reflection survey, looking west.
Date Published: April 30, 2018
Status: Completed

Untangling Faults at Depth – What Lies Beneath Panamint Valley, California?

Release Date: APRIL 30, 2018

The eastern edge of Panamint Valley,CA has two types of faults that can be seen in the near-surface geology. 150 geophones and a seismic source will help reveal the subsurface picture.

Gentle river waters near grassy cliff in foreground, with a beach, and an amusement park in background, other buildings afar.
Date Published: March 29, 2018
Status: Active

Climate check in our Santa Cruz backyard

For a beach town like Santa Cruz, preserving beaches by mitigating coastal erosion is vital. Surveys conducted now and regularly in the future will help scientists understand the short- and long-term impacts of climate change, El Niño years, and sea-level rise on a populated and vulnerable coastline.

areal view of corte madera creek
Date Published: March 27, 2018
Status: Active

Assessing Deposit Build-up in Corte Madera Flood Control Channel

The Corte Madera Flood Control Channel was designed to prevent waters from overflowing Corte Madera Creek in a highly populated area of Marin County. Since the channel was last dredged in 1990 approximately 5,400 cubic feet of sediment has accumulated. The accumulation of sediment is of concern because the sediment may reduce the effectiveness of the channel, posing a flooding threat to...

Contacts: Daniel Livsey
Maps of the California maximum tsunami-inundation zone and land-cover data from the 2006 National Land Cover Database
Date Published: March 20, 2018
Status: Active

Tsunamis

The 2004 Indian Ocean, 2010 Chilean, and 2011 Tohoku disasters have shown how tsunamis are significant threats to coastal communities. To help U.S. coastal communities prepare for future tsunamis, the Hazards Vulnerability Team completed projects related to population exposure and sensitivity, pedestrian...

Stream going on rocks
Date Published: March 16, 2018
Status: Active

Chiricahua Mountains - Reduction of Channel Gradients

Drainages in the Chiricahua Mountains are impacted by large rain events that cause gullying effects in the headwaters, overflow at road crossings, flooding of campgrounds, and overwhelming sediment loads at outlets (Chiricahua National Monument). Monsoon rains following recent fires cause severe flooding in most drainages and...

Contacts: Laura M Norman
Babocomari background
Date Published: March 14, 2018
Status: Active

Babocomari - Managed Aquifer Recharge

We are working to investigate the most cost-efficient way to recharge the Sierra Vista sub-basin aquifer using rainwater harvesting in the tributaries of the San Pedro River using low-technology methods. Research is being conducted on the Babacomari Ranch, property of the Brophy family. The ...

Contacts: Laura M Norman
Photograph of gabion dam in Nogales, Sonora
Date Published: March 14, 2018
Status: Active

Aridland Water Harvesting Study

Most of western North America has been severely grazed by cattle, causing grasslands to deteriorate and desert scrub expansion. Climate in arid and semi-arid regions is often typified by short, intense rainfall events which contribute to short-term flooding and erosion. Associated arroyo cutting occurs when ephemeral creek beds are carved into the floodplain when erratic overland flow occurs;...

coastal vulnerability of sea-level rise map
Date Published: January 18, 2018
Status: Active

National Assessment of Coastal Vulnerability to Sea Level Rise

The original national coastal vulnerability index (CVI) assessment was motivated by expected accelerated sea-level rise (SLR) and the uncertainty in the response of the coastline to SLR. This research was conducted between 1999 and 2001, and is currently being updated using new data sources and methodology. This original study was part of the ...

Oblique aerial photograph looking to the southwest along the southern end of Cedar Island, Virginia
Date Published: January 18, 2018
Status: Active

Long-Term Coastal Change

Goals of this task include developing and improving coastal-change assessments and supporting long-term planning and decision making to ensure sustainable coastal economies, infrastructure, and ecosystems.

Big Sur landslide on May 20, 2017 showing material across Highway 1.
Date Published: December 7, 2017
Status: Active

The Mud Creek landslide on California’s Big Sur coast

On May 20, 2017, the steep slopes at Mud Creek on California’s Big Sur coast, about 140 miles south of San Francisco, suffered a catastrophic collapse. USGS Scientists from the Pacific Coastal and Marine and the Geology, Minerals, Energy, and Geophysics Science Centers are monitoring this section of the coastline, in collaboration with the California Department of Transportation.

A photo of the Diama Dam on the Senegal River, West Africa
Date Published: October 30, 2017
Status: Active

Ecology of Infectious Diseases

The public is most familiar with parasites' role in spreading infectious diseases to people and domestic animals. In tropical developing countries, malaria, schistosomiasis, and other infectious diseases cause significant human suffering. While most related studies focus on treating patients, Dr. Kevin Lafferty is studying how ecology of the local environment affects transmission of infectious...

Contacts: Kevin Lafferty
Filter Total Items: 354
USGS
January 1, 2017

Maximum depth of flooding surface (in cm) in the region landward of the present day shoreline that is inundated for the storm condition and sea-level rise (SLR) scenario indicated. Note: Duration datasets may have occasional gaps in open-coast sections.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of k

USGS
January 1, 2017

Geographic extent of projected coastal flooding, low-lying vulnerable areas, and maxium/minimum flood potential (flood uncertainty) associated with the sea-level rise 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 erosi

USGS
January 1, 2017

Projected Hazard: Model-derived significant wave height (in meters) for the given storm condition and sea-level rise (SLR) scenario.
Model Summary: 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 %2

USGS
January 1, 2017

Files contain hydrodynamic and sediment transport data for the location and deployment indicated. Time-series data of water depth, velocity, turbidity, and temperature were collected in San Pablo Bay and China Camp Marsh as part of the San Francisco Bay Marsh Sediment Experiments. Several instruments were deployed in tidal creek, marsh, mudflat, and Bay locations, gathering data on

USGS
January 1, 2017

This part of DS 781 presents 2-m-resolution data collected by Fugro Pelagos for the acoustic-backscatter map of the Offshore of Gaviota Map Area, California. The GeoTiff is included in "Backscatter_[Fugro]_OffshoreGaviota.zip," which is accessible from https://doi.org/10.5066/F7TH8JWJ. These data accompany the pamphlet and map sheets of Johnson, S.Y., Dartnell, P., C

USGS
January 1, 2017

Model-derived significant wave height (in meters) for the given storm condition and sea-level rise (SLR) scenario.
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. CoSMoS v3.0 for So

USGS
January 1, 2017

Geographic extent of projected runup associated with the sea-level rise 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. CoSMoS v3.0 for Southern California sh

USGS
January 1, 2017

Projected Hazard: Model-derived significant wave height (in meters) for the given storm condition and sea-level rise (SLR) scenario.
Model Summary: 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 %2

USGS
January 1, 2017

Files contain hydrodynamic and sediment transport data for the location and deployment indicated. Time-series data of water depth, velocity, turbidity, and temperature were collected in San Pablo Bay and China Camp Marsh as part of the San Francisco Bay Marsh Sediment Experiments. Several instruments were deployed in tidal creek, marsh, mudflat, and Bay locations, gathering data on

USGS
January 1, 2017

Investigations of coastal change and coastal resources often require continuous elevation profiles from the seafloor to coastal terrestrial landscapes. Differences in elevation data collection in the terrestrial and marine environments result in separate elevation products that may not share a vertical datum. This data release contains the assimilation of multiple elevation products into a contin

USGS
January 1, 2017

Files contain hydrodynamic and sediment transport data for the location and deployment indicated. Time-series data of water depth, velocity, turbidity, and temperature were collected in San Pablo Bay and China Camp Marsh as part of the San Francisco Bay Marsh Sediment Experiments. Several instruments were deployed in tidal creek, marsh, mudflat, and Bay locations, gathering data on

USGS
January 1, 2017

Model-derived significant wave height (in meters) for the given storm condition and sea-level rise (SLR) scenario.
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. CoSMoS v3.0 for So

Filter Total Items: 319
Publication Thumbnail
Year Published: 2004

Reproductive status of western mosquitofish inhabiting selenium- contaminated waters in the Grassland Water District, Merced County, California

This study was implemented to determine if western mosquitofish (Gambusia affinis) populations in the Grassland Water District suffer from impaired reproduction because of seleniferous inflows of agricultural drainwater from the Grassland Bypass Project. During June to July 2001, laboratory trials with pregnant female fish collected from two...

Saiki, M.K.; Martin, B.A.; May, T.W.
Reproductive status of western mosquitofish inhabiting selenium- contaminated waters in the Grassland Water District, Merced County, California; 2004; Article; Journal; Archives of Environmental Contamination and Toxicology; Saiki, M. K.; Martin, B. A.; May, T. W.

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Year Published: 2004

Summary of total mercury concentrations in fillets of selected sport fishes collected during 2000-2003 from Lake Natoma, Sacramento County, California

This report summarizes results of total mercury measurements in skinless fillets of sport fishes collected during August 2000, September?October 2002, and July 2003 from Lake Natoma, a small (8,760 acre-feet) afterbay for Folsom Dam on the lower American River. The primary objective of the study was to determine if mercury concentrations in...

Saiki, Michael K.; Slotton, Darrell G.; May, Thomas W.; Ayers, Shaun M.; Alpers, Charles N.
Summary of total mercury concentrations in fillets of selected sport fishes collected during 2000-2003 from Lake Natoma, Sacramento County, California; 2004; DS; 103; Saiki, Michael K.; Slotton, Darrell G.; May, Thomas W.; Ayers, Shaun M.; Alpers, Charles N.

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Year Published: 2003

Signatures of the seismic source in EMD-based characterization of the 1994 Northridge, California, earthquake recordings

In this article we use empirical mode decomposition (EMD) to characterize the 1994 Northridge, California, earthquake records and investigate the signatures carried over from the source rupture process. Comparison of the current study results with existing source inverse solutions that use traditional data processing suggests that the EMD-based...

Zhang, R.R.; Ma, S.; Hartzell, S.
Signatures of the seismic source in EMD-based characterization of the 1994 Northridge, California, earthquake recordings; 2003; Article; Journal; Bulletin of the Seismological Society of America; Zhang, R. R.; Ma, S.; Hartzell, S.

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Year Published: 2003

Site response, shallow shear-wave velocity, and wave propagation at the San Jose, California, dense seismic array

Ground-motion records from a 52-element dense seismic array near San Jose, California, are analyzed to obtain site response, shallow shear-wave velocity, and plane-wave propagation characteristics. The array, located on the eastern side of the Santa Clara Valley south of the San Francisco Bay, is sited over the Evergreen basin, a 7-km-deep...

Hartzell, S.; Carver, D.; Williams, R.A.; Harmsen, S.; Zerva, A.
Site response, shallow shear-wave velocity, and wave propagation at the San Jose, California, dense seismic array; 2003; Article; Journal; Bulletin of the Seismological Society of America; Hartzell, S.; Carver, D.; Williams, R. A.; Harmsen, S.; Zerva, A.

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Year Published: 2002

Distribution and transport of suspended particulate matter in Monterey Canyon, California

From August 1993 to August 1994, six moorings that measure current, temperature, salinity, and water clarity were deployed along the axis of Monterey Canyon to study the circulation and transport of water and suspended particulate matter through the canyon system. The moorings occupied three sites that are morphologically different: a narrow...

Xu, J. P.; Noble, M.; Eittreim, S.L.; Rosenfeld, L.K.; Schwing, F.B.; Pilskaln, C.H.
Distribution and transport of suspended particulate matter in Monterey Canyon, California; 2002; Article; Journal; Marine Geology; Xu, J. P.; Noble, M.; Eittreim, S. L.; Rosenfeld, L. K.; Schwing, F. B.; Pilskaln, C. H.

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Year Published: 2000

A seismic landslide susceptibility rating of geologic units based on analysis of characterstics of landslides triggered by the 17 January, 1994 Northridge, California earthquake

One of the most significant effects of the 17 January, 1994 Northridge, California earthquake (M=6.7) was the triggering of thousands of landslides over a broad area. Some of these landslides damaged and destroyed homes and other structures, blocked roads, disrupted pipelines, and caused other serious damage. Analysis of the distribution and...

Parise, M.; Jibson, Randall W.

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Year Published: 1999

Maps Showing Locations of Damaging Landslides Caused by El Nino Rainstorms, Winter Season 1997-98, San Francisco Bay Region, California

Heavy rainfall associated with a strong El Nino caused over $150 million in landslide damage in the 10-county San Francisco Bay region during the winter and spring of 1998. Reports of landsliding began in early January 1998 and continued throughout the winter and spring. On February 9, President Clinton declared all 10 counties eligible for...

Godt, Jonathan W.
Maps Showing Locations of Damaging Landslides Caused by El Nino Rainstorms, Winter Season 1997-98, San Francisco Bay Region, California; 1999; MF; 2325; Godt, Jonathan W.

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Year Published: 1999

Map showing locations of damaging landslides in Alameda County, California, resulting from 1997-98 El Nino rainstorms

Heavy rainfall associated with a strong El Nino caused over $150 million in landslide damage in the 10-county San Francisco Bay region during the winter and spring of 1998. A team of USGS scientists collected information on landslide locations and damage costs. In Alameda County more than $20 million in damages were assessed. Debris flows occurred...

Coe, J.A.; Godt, J.W.; Brian, Dianne; Houdre, Nicolas
Map showing locations of damaging landslides in Alameda County, California, resulting from 1997-98 El Nino rainstorms; 1999; MF; 2325-B; Coe, J. A.; Godt, J. W.; Brian, Dianne; Houdre, Nicolas

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Year Published: 1999

Map showing locations of damaging landslides in Contra Costa County, California, resulting from 1997-98 El Nino rainstorms

Heavy rainfall associated with a strong El Nino caused over $150 million in landslide damage in the 10-county San Francisco Bay region during the winter and spring of 1998. A team of USGS scientists collected information on landslide locations and damage costs. About $27 million in damages were assessed in Contra Costa County.

Graymer, Russell W.; Godt, Jonathan W.
Map showing locations of damaging landslides in Contra Costa County, California, resulting from 1997-98 El Nino rainstorms; 1999; MF; 2325-E; Graymer, Russell W.; Godt, Jonathan W.

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Year Published: 1999

Map showing locations of damaging landslides in Marin County, California, resulting from 1997-98 El Nino rainstorms

Heavy rainfall associated with a strong El Nino caused over $150 million in landslide damage in the 10-county San Francisco Bay region during the winter and spring of 1998. A team of USGS scientists collected information on landslide locations and damage costs. About $2.5 million in damages were assessed in Marin County.

Morrissey, Meghan M.; Wieczorek, Gerald F.; Godt, Jonathan W.
Map showing locations of damaging landslides in Marin County, California, resulting from 1997-98 El Nino rainstorms; 1999; MF; 2325-C; Morrissey, Meghan M.; Wieczorek, Gerald F.; Godt, Jonathan W.

Filter Total Items: 1,162
man in yellow shirt and camo coveralls standing in thigh-high water with instrument.
December 31, 2017

Measuring streamflow in the Sisquoc River near Garey, California.

USGS technician measuring streamflow in the Sisquoc River near Garey, California, upstream of the Santa Maria Mesa Road Bridge.

Big Sur coast. Red squares mark some of the sites damaged by 2016–17 winter storms, including Mud Creek and Paul’s Slide areas
December 31, 2017

Map of Big Sur coast with labels

Big Sur coast. Red squares mark some of the sites damaged by 2016–17 winter storms, including Mud Creek and Paul’s Slide areas.

scientific instruments and platform next to river surrounded by snow
December 31, 2017

USGS Streamgaging on the Pit River operates year round.

 USGS Streamgaging equipment and cableway on the Pit River near Canby, California operates year round.

Air photo of Paul's slide (left); photo of repair equipment/construction (right)
December 31, 2017

Air photo, Paul's slide (left); repair equipment/construction (right)

Paul’s Slide. Left: Air photo taken May 27, 2017, one of many that Beth Haddon will analyze with structure-from-motion software to measure changes in ground elevation. Right: Caltrans employees and contractors use an excavator and bulldozer to remove Paul’s Slide debris from California State Highway 1. Note recent construction of concrete and a line of grouted reinforcing

...
Two technicians in a cablecar over a river, with an instrument hanging below them
December 31, 2017

Lowering an acoustic Doppler current profiler from a cable way.

USGS technicians preparing for a streamflow measurement by lowering an acoustic Doppler current profiler from a cable way on the American River near Fair Oaks, California. 

Cheryl Hapke is now sharing her knowledge of the Big Sur region with Warrick’s team
December 31, 2017

Cheryl Hapke shares her knowledge of the Big Sur region

Cheryl Hapke is now sharing her knowledge of the Big Sur region with Warrick’s team, and she is eager to leap back into studies of Big Sur coastal change.

two men in camo-patterned overalls standing next to a boat on the shore of a river with an instrument on the ground.
December 31, 2017

Technicians prepare to board a boat to measure water flow.

USGS technicians prepare to board a boat to go out to the center of the channel in the San Joaquin River below Friant Dam to get an accurate measurement of water flow during releases from the Dam for flood control.

Medicine Lake, California simplified hazards map showing potential ...
December 31, 2017

Medicine Lake, CA simplified hazards map

Medicine Lake, California simplified hazards map showing potential impact area for ground-based hazards during a volcanic event.

man in yellow slicker standing in rushing river up to his thighs, holding a stick-like instrument in the water
December 31, 2017

Measuring streamflow in fast moving floodwater.

USGS hydrographer measuring streamflow using a handheld Acoustic Doppler Velocimeter in fast moving floodwater Cajon Creek near Keenbrook, California. 

Pollen samples from various plants collected from hedgerows
December 31, 2017

Pollen samples from various plants collected from hedgerows

Organic Chemistry Research Laboratory -- Sacramento, California. Small sample bottles with pollen inside

Map of Active Faults and Historic Earthquakes in California
December 31, 2017

California Seismicity

Map of historic seismicity, major faults, and paleoseismic summary of San Andreas Fault system.

USGS
December 31, 2017

Big Brown Bat (Eptesicus fuscus) Call

Bats produce a variety of vocalizations that are used for navigation, feeding, and social communication. Most vocalizations are pitched well above the range of human hearing and are referred to as ultrasonic. These calls are often known as echolocation calls since bats use the echoes produced when a sound bounces off a bug or a building to determine what is in the area. 

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Filter Total Items: 912
USGS
December 18, 2014

Secretary of the Interior Sally Jewell announced today that Interior’s Southwest Climate Science Center is awarding nearly a million dollars to universities and other partners for research to guide managers of parks, refuges and other cultural and natural resources in planning how to help species and ecosystems adapt to climate change.

USGS
December 11, 2014

The U.S. Geological Survey is hosting three media availabilities on Friday, Dec. 12 at high-water areas on the Russian River near Geyserville, Calif.; the Sacramento River at Delta, Calif; and Cache Creek near Yolo, Calif. A hydrologist will be available for interviews as field crews collect data.

Historical photo of a flood on Willamette River in Oregon from 1964
December 11, 2014

The Christmas flood of 1964 encompassed about 200,000 square miles, or roughly the size of France, resulted in 47 deaths, left thousands homeless and caused more than $540 million ($3.9 billion today) worth of damage.

Map showing drought coverage of California
December 8, 2014

A newly released interactive California Drought visualization website aims to provide the public with atlas-like, state-wide coverage of the drought and a timeline of its impacts on water resources.

Earthquake swarm near Lassen Volcanic Center Nov 6 to Nov 12, 2014...
November 12, 2014

CalVO is tracking an earthquake swarm that began on November 9 located at the Tehama County-Plumas County border within Lassen National Forest.

Seismicity in the Long Valley Volcanic Region between 2004 and 2014...
October 31, 2014

A cataclysmic eruption of 600 km3 of rhyolite magma (Bishop Tuff) about 760,000 years ago resulted in the collapse of the partially evacuated magma chamber to form the present 17 by 32 km (10 by 20 mi) Long Valley Caldera.

thumbnail image of flyer for Wolf and Elk Diseases in Yellowstone presentation
October 30, 2014

What can wildlife diseases tell us about the emergence of human pandemics? 

Image: Coastal Survey Vessel in Use at Santa Cruz, California
October 20, 2014

During the week of Oct 20 - 24 scientists from the U.S. Geological Survey will be working along the coastline from Santa Cruz to Moss Landing. Either by all-terrain vehicle, personal watercraft, or on foot, they will be surveying local beaches and the nearby ocean bottom to compile a three-dimensional map of how beaches change in northern Monterey Bay.

USGS
October 14, 2014

The Downtown Association of Santa Cruz will host a 25th anniversary commemoration of the Loma Prieta Earthquake.

WERC Sierra Nevadas
October 13, 2014

The USGS California Volcano Observatory (CalVO) is tracking an earthquake swarm in the Sierra Nevada range south of Long Valley Caldera, about 8 miles SW of Toms Place and 15 miles SE of the town of Mammoth Lakes.

Long Valley Caldera Earthquakes greater than M1.0 from 09/22 to 09/...
September 28, 2014

Over the past 42 hours, the earthquake swarm in California's Long Valley Caldera, which began last Friday (see September 26 post), has gradually diminished in terms of numbers of earthquakes and in earthquake magnitude.