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

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.

News

Date published: April 19, 2021

Large Decreases in Upper Colorado River Salinity Since 1929

Salinity levels in the Upper Colorado River Basin, which covers portions of Wyoming, Colorado, Utah, Arizona and New Mexico, have steadily decreased since 1929, according to a new U.S. Geological Survey study analyzing decades of water-quality measurements.

Date published: March 31, 2021

New USGS Analysis of Wind Turbine Upgrades Shows No Impact on Wildlife Mortality

CORVALLIS, ORE. – Reduction in wildlife mortality rates is sometimes cited as a potential benefit to the replacement of older, smaller turbines by larger, next generation turbines. In contrast, others have expressed concern that newer, larger turbines may actually increase bird and bat deaths.

Date published: March 29, 2021

TNMCorps Mapping Challenge Summary Results for Schools in CA & NV

Summary statistics are now available for this challenge. Thanks again to everyone who contributed!

Filter Total Items: 415
Date published: April 13, 2021
Status: Active

Continuous, Real-Time Water-Quality Monitoring of the Los Angeles River

As part of the Urban Waters Federal Partnership (UWFP) program, this project will bring enhanced water-quality monitoring to a stretch of the Los Angeles River slated for revitalization. The UWFP reconnects urban...

Contacts: Gregory Mendez
Date published: March 9, 2021
Status: Active

Cascadia Subduction Zone Marine Geohazards

Societal Issue: Uncertainty related to rupture extent, slip distribution, and recurrence of past subduction megathrust earthquakes in the Pacific Northwest (northern CA, OR, WA, and southern BC) leads to ambiguity in earthquake and tsunami hazard assessments and hinders our ability to prepare for future events.

Date published: March 5, 2021
Status: Active

Remote Sensing Coastal Change

We use remote-sensing technologies—such as aerial photography, satellite imagery, structure-from-motion (SfM) photogrammetry, and lidar (laser-based surveying)—to measure coastal change along U.S. shorelines.

Date published: February 17, 2021
Status: Active

January 2021: Evaluation of debris flow activity in recent California Burn Areas following atomospheric river event

The January 2021 atmospheric river event produced heavy rainfall in some areas burned by wildfires in 2020. The Landslide Hazards Program (LHP) staff has evaluated the debris-flow activity in several areas. The locations are: The Carmel Fire, the CZU Lightning Complex Fire (San Mateo and Santa Cruz), the Dolan Fire, and the River Fire burn areas.

Reports by date are below. Photos will...

Contacts: Jason Kean
Date published: February 10, 2021
Status: Active

Longfin Smelt Distribution in the Coastal Pacific Ocean

Longfin Smelt (Spirinchus thaleichthys) is a pelagic fish species found in waters along the Pacific coast, from Alaska to central California. Its complex life cycle makes it vulnerable to threats in both freshwater and at sea. Longfin Smelt is listed as a threatened species by the state of California.

Date published: February 2, 2021
Status: Active

Big Sur Landslides

On California’s Big Sur coast, the steep slopes at Mud Creek suffered a catastrophic collapse (May 20, 2017). On January 28, 2021, heavy rains from a two-day storm caused debris from fire-scarred slopes to wash out another section of road at Rat Creek. USGS scientists are monitoring this 100-mile section of the California coastline, in collaboration with the CA Department of Transportation....

Date published: January 29, 2021
Status: Active

The Mud Creek Landslide May 20 2017

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 Science Center and the Geology, Minerals, Energy, and Geophysics Science Center continue to monitor this section of the coastline, in collaboration with the California Department of...

Date published: January 27, 2021
Status: Active

Dynamic coastlines along the western U.S.

The west coast of the United States is extremely complex and changeable because of tectonic activity, mountain building, and land subsidence. These active environments pose a major challenge for accurately assessing climate change impacts, since models were historically developed for more passive sandy coasts.

Date published: January 22, 2021
Status: Active

U.S. West Coast and Alaska Marine Geohazards

Marine geohazards are sudden and extreme events beneath the ocean that threaten coastal populations. Such underwater hazards include earthquakes, volcanic eruptions, landslides, and tsunamis.

Devastating earthquakes in Japan (2011) and Chile (2010) that spawned pan-oceanic tsunamis sent a sobering reminder that U.S. coastlines are also vulnerable to natural disasters that originate in...

Date published: January 20, 2021
Status: Active

Assessing Sediment Nutrient Storage and Release in California's Sacramento-San Joaquin Delta

Sediments represent an important pool of nutrients in the Sacramento-San Joaquin Delta (Delta). The exchange of nutrients between the water column and the benthos impacts water quality and effects phytoplankton, harmful algal blooms, aquatic vegetation, and drinking water quality. To date, there is very limited information about nutrient pools in Delta sediments, nor how these nutrients are...

Date published: December 31, 2020
Status: Active

San Francisco Bay geomorphology

This research is part of the project “Sediment Transport in Coastal Environments

Contacts: Bruce Jaffe
Filter Total Items: 542
Date published: April 13, 2021

Water Quality Samples for USGS 11092450 LOS ANGELES R A SEPULVEDA DAM CA

Water-quality data collected for various parameters at USGS monitoring site 11092450 (Los Angeles River at Sepulveda Dam).

Date published: March 19, 2021

Geophysical and sampling data collected offshore Oceanside, southern California during field activity 2017-686-FA from 2017-10-23 to 2017-10-31

This data release contains geophysical and sediment sample data that were collected aboard the R/V Snavely in 2017 on U.S. Geological Survey cruise 2017-686-FA offshore Oceanside, southern California. The goal of the survey was to provide high-resolution imaging, magnetic anomaly profiles and sediment analysis to characterize the surface and subsurface properties of the study area such as

Date published: March 10, 2021

Coastal Storm Modeling System (CoSMoS) for Central California, v3.1

CoSMoS v3.1 for Central California shows projections for future climate scenarios to provide emergency responders and coastal planners with critical storm-hazards information that can be used to increase public safety, mitigate physical damages, and more effectively manage and allocate resources within complex coastal settings. Data for Central California: Pt. Conception to Golden Gate Bridge...

Date published: March 9, 2021

Mud logs from the Oxnard Oil Field, Ventura County, California

The U.S. Geological Survey (USGS) in cooperation with the California State Water Resources Control Board (SWRCB) compiled and digitized mud logs from oil and gas wells in the Oxnard Oil Field area.

Date published: March 9, 2021

Fluid levels in the Oxnard Oil Field, Ventura County, California

The U.S. Geological Survey (USGS), in cooperation with the California State Water Resources Control Board (SWRCB), compiled Fall 2017 fluid level elevation data from idle oil and gas wells in the Oxnard Oil Field to estimate vertical hydraulic head difference between oil production and overlying groundwater aquifer zones.

Date published: February 22, 2021

Erodibility Data from Gust Erosion Chamber Experiments in Grizzly Bay and San Pablo Bay, California, Summer 2019

A Gust erosion chamber was used to apply horizontal shear stress to sediment cores obtained from San Pablo and Grizzly (within Suisun) Bays in California. A pair of sediment cores were collected from the same approximate locations in each bay six times between June 12th, 2019 and August 15th, 2019 for a total of 12 experiments and 24 sediment core results.

Date published: February 22, 2021

Verified Irrigated Agricultural Lands for the United States, 2002-17

The spatial extents of verified irrigated lands were compiled from various federal and state sources across the nation and combined into a single Geographic Information System (GIS) geodatabase for the purpose of model training and validation.

Date published: February 22, 2021

High-Resolution Measurements to Identify Effects of Aquatic Vegetation on Water Quality and Stratification

The dataset documents the spatial and temporal variability of nutrients and related water quality parameters at high spatial resolution in the North Delta of the Sacramento-San Joaquin River Delta of California, USA.

Date published: February 22, 2021

Insecticide and fungicide concentrations in irrigation runoff and soils from a lettuce field in the Salinas Valley, California, 2019 and 2020

Irrigation runoff and soil samples were collected from a lettuce field located at the USDA-ARS Spence Research farm in the Salinas Valley, California to measure neonicotinoid insecticides (clothianidin and imidacloprid) and a fungicide (azoxystrobin) applied via coated seed and drench treatments.

Date published: February 8, 2021

Water chemistry data for samples collected at groundwater sites near the Oxnard oil field, June 2017-August 2017, Ventura County, California

In cooperation with the California State Water Resources Control Board's oil and gas Regional Monitoring Program, the U.S. Geological Survey collected and analyzed groundwater and associated quality control (QC) samples during June 2017 - August 2017.

Date published: January 26, 2021

Hydrodynamic and sediment transport data from San Pablo Bay and Grizzly Bay, California, 2019

USGS scientists collected hydrodynamic and sediment-transport data at shallow water sites in San Pablo Bay and Grizzly Bay, in northern San Francisco Bay between June and November 2019. The data were collected to determine hydrodynamic forcing, bed roughness, suspended-sediment concentration, and physical properties of the sediment bed. This data release includes hydrodynamic and sediment...

Date published: January 25, 2021

Diets and Stable Isotopes of Fishes in Rodeo Lagoon, California, 2016-2017

This dataset includes lab data for fish, fish diets, and stable isotopes for fish tissue, vegetation, and invertebrates collected during daylight hours in the Rodeo Lagoon and Lake in Golden Gate National Recreation Area at the Pacific Coast, USA during 2016 and 2017. This data release includes all animal taxa, and isotope values included in the analysis.

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View of Capitola, California, coastline
January 26, 2021

Prediction of Flooding Now and Into the Future: a geonarrative on coastal storms

map excerpt displaying geology
January 21, 2021

The USGS is conducting a comprehensive evaluation of groundwater resources of the Adelaida area. Use this map to explore the hydrogeology of the area, including land use, geology, and USGS hydrologic data by watershed or water management district. 

nightly view of highway with large cracks from earthquake and car in the distance.
December 4, 2020

This USGS geonarrative (Esri Story Map) summarizes the USGS response and findings after the M6.4 on July 4 and M7.1 on July 6, 2019 in Searles Valley, Southern California, and includes links to USGS research publications and data releases.

bluegreen algae distribution map
August 7, 2020

A data visualization exploring the relationship between nutrient distribution and phytoplankton under different conditions across the San Francisco Delta and Estuary. Assessing distribution and abundance aids understanding of how managing nutrient supplies affects aquatic food webs, helping managers evaluate the potential environmental benefits of future nutrient reduction efforts against costs.

screen shot of Bay-Delta web app that visualizes water quality data
August 6, 2020

Data visualization tool created for California's Bay-Delta Regional Monitoring Program.  This web application visualizes nutrients and phytoplankton spatially and temporally for data collected in 2018.

This is a map of the Southwest US with RestoreNet sites in six ecoregions.
May 14, 2020

RestoreNet is a networked ecological experiment on the cutting-edge of restoration science. The experiment sites span dryland ecoystems of the southwest U.S.

Black and grey map of the contiguous 48 states shaded by the number of people using domestic wells per square kilometer (2010)
April 23, 2020

Domestic wells provide drinking water supply for approximately 40 million people in the United States. Knowing the location of these wells, and the populations they serve, is important for identifying heavily used aquifers, locations susceptible to contamination, and populations potentially impacted by poor-quality groundwater. 

volcano exposure storymap
April 1, 2020

A geonarrative summary of the USGS report that provides a broad perspective on California’s exposure to volcanic hazards. By integrating volcanic hazard information with geospatial data on populations, infrastructure, and resources, the results provide estimates of impacts to people and our environment if an eruption were to occur.

screenshot of the user interface for the groundwater quality mapper
March 25, 2020

The GAMA-PBP Public-Supply Well Results data viewer allows the user to visualize and download California water-quality data and trends for1974 - 2014. Groundwater-quality data for 38 inorganic constituents are captured and can be downloaded for individual sites or by grid cell. 

Figure 4 for Southwestern Willow Flycatcher Habitat Viewer webpage
March 12, 2020

Figure 4. Yearly Distribution (2007-2019) of Tamarisk Beetle (Diorhabda spp.). Annual tamarisk beetle distribution map. Provided by RiversEdge West. 2020. Used with permission from Ben Bloodgood, Program Coordinator.

Bathymetry of Monterey Canyon and the Soquel Canyon tributary
February 28, 2020

The California Seafloor Mapping Program (CSMP) is a cooperative program to create a comprehensive coastal and marine geologic and habitat base map series for California's State waters. Initiated in 2008, the CSMP has collected bathymetry and backscatter data that are being turned into habitat and geologic base maps.

Map of California showing the sections of the coast where the USGS has generated computer models of storm impacts.
February 28, 2020

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 SLR scenarios, as well as long-term shoreline change and cliff retreat. Several versions of CoSMoS have been implemented for areas of the California coast.

Filter Total Items: 414
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Year Published: 2021

Landscape evolution in eastern Chuckwalla Valley, Riverside County, California

This study investigates sedimentary and geomorphic processes in eastern Chuckwalla Valley, Riverside County, California, a region of arid, basin-and-range terrain where extensive solar-energy development is planned. The objectives of this study were to (1) measure local weather parameters and use them to model aeolian sediment-transport potential...

East, Amy E.; Gray, Harrison J.; Redsteer, Margaret Hiza; Ballmer, Matthew
East, A.E., Gray, H.J., Redsteer, M.H., and Ballmer, M., 2021, Landscape evolution in eastern Chuckwalla Valley, Riverside County, California: U.S. Geological Survey Scientific Investigations Report 2021–5017, 46 p., https://doi.org/10.3133/sir20215017.

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Year Published: 2021

Characterization of deep-sea coral and sponge communities in Greater Farallones National Marine Sanctuary: Point Arena South Essential Fish Habitat Conservation Area and New Amendment 28 Areas

This report summarizes samples collected during a remotely operated vehicle (ROV) cruise conducted in October 2019 on board E/V Nautilus. Areas sampled in Greater Farallones National Marine Sanctuary included areas proposed for fisheries management zoning in the Point Arena South (PAS) Essential Fish Habitat Conservation Area (EFH). Dive planning...

Graiff, Kaitlin; Roletto, Jan; Tezak, Sage; Williams, Gary E.; Cochrane, Guy R.

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Year Published: 2021

Forecasting the frequency and magnitude of postfire debris flows across southern California

Southern California has a long history of damaging debris flows after wildfire. Despite recurrent loss, forecasts of the frequency and magnitude of postfire debris flows are not available for the region like they are for earthquakes. Instead, debris flow hazards are typically assessed in a reactive manner after wildfires. Such assessments are...

Kean, Jason W.; Staley, Dennis M.

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Year Published: 2021

A geology and geodesy based model of dynamic earthquake rupture on the Rodgers Creek‐Hayward‐Calaveras Fault System, California

The Hayward fault in California's San Francisco Bay area produces large earthquakes, with the last occurring in 1868. We examine how physics‐based dynamic rupture modeling can be used to numerically simulate large earthquakes on not only the Hayward fault, but also its connected companions to the north and south, the Rodgers Creek and Calaveras...

Harris, Ruth A.; Barall, Michael; Lockner, David A.; Moore, Diane E.; Ponce, David A.; Graymer, Russell; Funning, Gareth J.; Morrow, Carolyn A.; Kyriakopoulos, Christodoulos; Eberhart-Phillips, Donna

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Year Published: 2021

The weight of cities: Urbanization effects on Earth’s subsurface

Across the world, people increasingly choose to live in cities. By 2050, 70% of Earth's population will live in large urban areas. Upon considering a large city, questions arise such as, how much does that weigh? What are its effects on the landscape? Does it cause measurable subsidence? Here I calculate the weight of San Francisco Bay region...

Parsons, Thomas E.

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Year Published: 2021

Toward physics-based nonergodic PSHA: A prototype fully-deterministic seismic hazard model for southern California

We present a nonergodic framework for probabilistic seismic‐hazard analysis (PSHA) that is constructed entirely of deterministic, physical models. The use of deterministic ground‐motion simulations in PSHA calculations is not new (e.g., CyberShake), but prior studies relied on kinematic rupture generators to extend empirical earthquake rupture...

Milner, Kevin R.; Shaw, Bruce E.; Goulet, Christine A.; Richards-Dinger, Keith B.; Callaghan, Scott; Jordan, Thomas H.; Dieterich, James H.; Field, Edward H.

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Year Published: 2021

Juvenile Chinook salmon survival, travel time, and floodplain use relative to riverine channels in the Sacramento–San Joaquin River Delta

Floodplains provide multiple benefits to both resident and migratory fish species, including juvenile Chinook Salmon Oncorhynchus tshawytscha, but direct comparisons of survival during migration through a floodplain versus riverine routes are scarce. The Yolo Bypass is a broad floodplain of the Sacramento River that floods in about 30% of...

Pope, Adam; Perry, Russell; Harvey, Brett N.; Hance, Dalton; Hansel, Hal C

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Year Published: 2021

The impacts of the 2015/2016 El Niño on California's sandy beaches

The El Niño Southern Oscillation is the most dominant mode of interannual climate variability in the Pacific. The 2015/2016 El Niño event was one of the strongest of the last 145 years, resulting in anomalously high wave energy across the U.S. West Coast, and record coastal erosion for many California beaches. To better manage coastal resources,...

Smith, Schuyler A; Barnard, Patrick L.

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Year Published: 2021

Characterizing strain between rigid crustal blocks in the southern Cascadia forearc: Quaternary faults and folds of the northern Sacramento Valley, California

Topographic profiles across late Quaternary surfaces in the northern Sacramento Valley (California, USA) show offset and progressive folding on series of active east- and northeast—trending faults and folds. Optically stimulated luminescence ages on deposits draping a warped late Pleistocene river terrace yielded differential incision rates along...

Angster, Stephen J.; Wesnousky, Steven G.; Figueiredo, Paula; Owen, Lewis A.; Sawyer, Thomas

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Year Published: 2021

Systematic characterization of morphotectonic variability along the Cascadia convergent margin: Implications for shallow megathrust behavior and tsunami hazards

Studies of recent destructive megathrust earth­quakes and tsunamis along subduction margins in Japan, Sumatra, and Chile have linked forearc mor­phology and structure to megathrust behavior. This connection is based on the idea that spatial varia­tions in the frictional behavior of the megathrust influence the tectono-morphological evolution of...

Watt, Janet; Brothers, Daniel

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Year Published: 2020

Characteristics of frequent dynamic triggering of microearthquakes in Southern California

Dynamic triggering of earthquakes has been reported at various fault systems. The triggered earthquakes are thought to be caused either directly by dynamic stress changes due to the passing seismic waves, or indirectly by other nonlinear processes that are initiated by the passing waves. Distinguishing these physical mechanisms is difficult...

Fan, Wenyuan; Barbour, Andrew; Cochran, Elizabeth S.; Lin, Guoqing

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Year Published: 2020

Seismic attenuation monitoring of a critically stressed San Andreas fault

We show that seismic attenuation ( ) along the San Andreas fault (SAF) at Parkfield correlates with the occurrence of moderate‐to‐large earthquakes at local and regional distances. Earthquake‐related  anomalies are likely caused by changes in permeability from dilatant static stress changes, damage by strong shaking from local...

Malagnini, Luca; Parsons, Thomas E.

Filter Total Items: 9
Image of a coastal cliff with lines drawn on it, that help to define the shape and areas of weakness.
August 19, 2020

The Cliff Feature Delineation Tool scans digital elevation models (DEM) to delineate features on seacliffs like the cliff top, midline, toe, and convexities/concavities on the cliff face, outputting linear features as polylines and point shapefiles. 

One-Water Hydrologic Flow Model cross section
April 7, 2020

The MODLFOW One-Water Hydrologic Flow Model (MF-OWHM) (MF-OWHM; Boyce and others, 2020Hanson and others, 2014) is a MODFLOW-2005-based integrated hydrologic flow model (IHM) that is the most complete version, to date, of the MODFLOW family of hydrologic simulators needed for the analysis of a broad range of conjunctive-use issues. 

Screenshot of GAMACTT web application.
January 24, 2020

Use this Groundwater Age Mixtures and Contaminant Trends Tool (GAMACTT) to explore the effects of basic aquifer properties and well configurations on groundwater age mixtures in groundwater discharge and on contaminant trends from varying nonpoint-source contaminant input scenarios.

4 graphs displaying example output from the TracerLPM software
January 15, 2020

An Excel® Workbook for Interpreting Groundwater Age Distributions from Environmental Tracer Data

multicolored map of Ocean Shores, Washington
April 13, 2017

The Pedestrian Evacuation Analyst is an ArcGIS extension that estimates how long it would take for someone to travel on foot out of a hazardous area that was threatened by a sudden event such as a tsunami, flash flood, or volcanic lahar. It takes into account the elevation changes and the different types of landcover that a person would encounter along the way.

MODPATH-OBS_distance-direction-observations_USGS-hydrologic-modelling
April 26, 2013

The MODPATH-OBS (Hanson and others, 2013) computer program is designed to calculate simulated equivalents for observations related to advective groundwater transport that can be represented in a quantitative way by using simulated particle-tracking data. 

map of the central valley with the CVHM grid cells overlaid, and a cross section of the subsurface
August 27, 2012

The Central Valley Hydrologic Model (CVHM) is an extensive, detailed three-dimensional (3D) computer model of the hydrologic system of the Central Valley (Faunt, 2009). The Central Valley Hydrologic Model (CVHM) simultaneously accounts for changing water supply and demand across the landscape, and simulates surface water and groundwater flow across the entire Central Valley.

subsurface grid showing relationship surface water and groundwater recharge
June 19, 2008

A Grid-Based, Distributed-Parameter Watershed Model to Estimate Net Infiltration Below the Root Zone

Filter Total Items: 1,113
April 12, 2021

Terra MODIS & S-NPP VIIRS Observe Snowpack in Sierra Nevada Mt. Range

The Moderate Resolution Imaging Spectroradiometer (MODIS) sensor is located aboard NASA’s Terra and Aqua satellites. The Visible Infrared Imaging Radiometer Suite (VIIRS) sensor is aboard the Suomi National Polar-orbiting Partnership (S-NPP) satellite. Together these sensors provide us with over two decades of crucial data for studying changes that have occurred on the

March 31, 2021

Image of the Week: Mudslide Cuts Through Big Sur Burn Scar

A mudslide near the 2020 Dolan Fire's ignition point chopped through a chunk of California's scenic State Highway 1 in late January. 

The Dolan Fire began near Big Sur on August 18th, 2020. It scarred nearly 125,000 acres before being fully contained in December. 

The damage is clear in false color Landsat 8 imagery from August and October. The scar is still

March 25, 2021

PubTalk 3/2021 - A Jaguar's Field of Dreams

Title: A Jaguar's Field of Dreams - If you build it, they will come (& other lessons from the U.S. - Mexico border) By: Laura M. Norman USGS, Western Geographic Science Center * Case study: the very lonely Jaguar * Madrean Archipelago Ecoregion, a biodiversity hotspot of the planet * Restoration ecohydrology and rewilding * Learn about the ecosystem services of rock

A woman stands in a rut eroded by water, on a very steep hill surrounded by burned trees.
February 28, 2021

Burned, denuded hillside in the CZU Lightning Complex

The USGS landslide team monitors and continues to update the hazard map models based on data collected in burn areas. This information improves future models and provides better hazard assessments used by officials for emergency response and decision making. Many of the steep hillsides burned and denuded in California fires repel water rather than soak it in. This

...
February 25, 2021

USGS Scientists Collect Water Quality Samples in the San Francisco Bay

USGS scientists collect water quality samples in the San Francisco Bay. The samples have been collected at the same locations for >50 years and are part of one of the longest running datasets of its kind in the United States. Sampling extends from the South San Francisco Bay at the Dumbarton bridge and ends in the Delta waterways in Antioch. Cruise days can last upwards

Imagery shows an aerial view of a coastal region, one is a photograph and one shows elevation data.
February 22, 2021

Examples of orthomosaic imagery and digital surface model

Examples of orthomosaic imagery and a high-resolution digital surface model of Post Point, Bellingham Bay, WA.

concrete-lined river running through an industrial area
February 5, 2021

Los Angeles River at USGS Streamgage 11092450 near Sepulveda Dam

A concrete-lined stretch of the Los Angeles River that runs near Sepulveda Dam.  USGS streamgage 11092450 can be seen in the lower left along the river wall. Restoration is planned for this stretch of the river that runs through the San Fernando Valley.

A large wheel, bigger than a person, holds a long green hose wrapped around its drum.
February 4, 2021

GeoEel on winch

The GeoEel is a multichannel digital streamer system, with hydrophones in a long, green hose. The streamer is towed in the water from a vessel like a long snake, and the hydrophones "listen" for and record the signals from the seismic sound source. Here, it is shown stored on its winch in the wareyard of MarFac, the USGS Pacific Coastal and Marine Science Center's marine

...
person standing on step slope with debris flow deposits and burned trees in background
January 31, 2021

Eagle Rock, California Debris Flow

Rilling and a shallow landslide in CZU Fire near Eagle Rock, California. Soil ~3 cm below surface was almost completely dry after the rain storm, highlighting soil water repellancy.  

A woman wearing a mask, hard hat, personal floatation device, and waders stands near a river.
January 31, 2021

Sampling sediment following wildfires

In August of 2020, the enormous CZU wildfire complex consumed over 85,000 acres in San Mateo and Santa Cruz Counties, leaving scarred landscapes in the hilly region. Runoff from large rainstorms in the winter months carry contaminants from the soils within these burned-out forests. Forest fires and the fire retardants used to help control and extinguish them introduce

...
A woman wearing a hard hat, personal floatation device, and waders kneels near a river taking a sample of mud.
January 31, 2021

Sampling sediment following wildfires

In August of 2020, the enormous CZU wildfire complex consumed over 85,000 acres in San Mateo and Santa Cruz Counties, leaving scarred landscapes in the hilly region. Runoff from large rainstorms in the winter months carry contaminants from the soils within these burned-out forests. Forest fires and the fire retardants used to help control and extinguish them introduce

...
A woman wearing a hard hat, personal floatation device, and waders kneels near a river taking a sample of mud.
January 31, 2021

Sampling sediment following wildfires

In August of 2020, the enormous CZU wildfire complex consumed over 85,000 acres in San Mateo and Santa Cruz Counties, leaving scarred landscapes in the hilly region. Runoff from large rainstorms in the winter months carry contaminants from the soils within these burned-out forests. Forest fires and the fire retardants used to help control and extinguish them introduce

...
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White salts covers the surface of the San Rafael Swell, Utah. 
April 19, 2021

Salinity levels in the Upper Colorado River Basin, which covers portions of Wyoming, Colorado, Utah, Arizona and New Mexico, have steadily decreased since 1929, according to a new U.S. Geological Survey study analyzing decades of water-quality measurements.

Two people kneeling to collect a carcass
March 31, 2021

CORVALLIS, ORE. – Reduction in wildlife mortality rates is sometimes cited as a potential benefit to the replacement of older, smaller turbines by larger, next generation turbines. In contrast, others have expressed concern that newer, larger turbines may actually increase bird and bat deaths.

THUMBNAIL: Timelapse of Schools in CA NV
March 29, 2021

Summary statistics are now available for this challenge. Thanks again to everyone who contributed!

2021 March Public Lecture Flyer
March 24, 2021

The U.S. Geological Survey public lecture series is back and virtual. News reporters are invited to attend to learn how USGS scientists are helping protect one of the only jaguars that lives in the U.S.

road on side of cliff above ocean showing part of road taken out by a landslide
March 24, 2021

Recent landslide activity along California’s Pacific coast in the region known as Big Sur has provided graphic examples of the power and impacts of natural hazard events.

TNMCorps Mapping Challenge: Schools in CA NV FINISHED
March 18, 2021

This challenge is now complete! Thank you to everyone who contributed!

TNMCorps Mapping Challenge: Schools in CA NV
March 11, 2021

Volunteers contributed almost 800 edits toward this challenge since last week. This includes the removal of over 100 points that were either closed or represented the wrong feature type - NICE WORK!!    

TNMCorps Mapping Challenge: Schools in CA NV
March 3, 2021

Volunteers continue to make progress on this challenge with almost 400 edits coming in since last week!

THUMBNAIL: Timelapse of FireStations in CA NV AZ
March 3, 2021

Summary statistics are now available for this challenge. Thanks again to everyone who contributed!

Home damaged by post fire debris flow
February 25, 2021

Southern California can now expect to see post-wildfire landslides occurring almost every year, with major events expected roughly every ten years, a new study led by U.S. Geological Survey researchers finds.

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