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: August 28, 2018
Status: Active

Organic Chemistry Research Laboratory — Sacramento, California

About the Laboratory

Chemists and hydrologists at the Organic Chemistry Research Laboratory (OCRL) develop targeted analytical methods for the quantitation of chemicals that can impact the health of organisms and humans. They have developed methods in a wide variety of environmental media; in addition to water and sediment, they also analyze a variety of tissue matrices...

Date published: August 27, 2018
Status: Completed

Increasing Soil Organic Carbon to Mitigate Greenhouse Gases and Increase Climate Resiliency for California

Rising air temperatures are projected to continue to drive up urban, agricultural, and rangeland water use, straining both surface and groundwater resources. Scientific studies have shown that managing farms, ranches, and public lands to increase soil carbon can increase soil waterholding capacity and increase hydrologic benefits such as increased baseflows and aquifer recharge, reduced...

Contacts: Michelle Stern
Date published: August 24, 2018
Status: Active

Yucaipa Valley Hydrogeology

This study assesses the quality of water in the Yucaipa area, primarily in the Yucaipa plain. This hydrogeology study will aid local water purveyors in understanding and evaluating local resources and using those resources effectively in combination with water imported from northern California and from the adjacent San Bernardino area.

Contacts: Gregory Mendez
Date published: August 5, 2018
Status: Active

Global Hyperspectral Imaging Spectroscopy of Agricultural-Crops & Vegetation (GHISA)

This webpage showcases the key research advances made in hyperspectral remote sensing of agricultural crops and vegetation over the last 50 years. There are three focus areas:

Date published: July 18, 2018
Status: Active

A Critical Assessment of Recent Soil Dating Methods in Coastal Wetlands- Judith Drexler

Are you interested in coastal wetlands and how they form in the landscape? In this internship you will learn about wetland formation and how carbon accumulates in wetland soils over time. In addition, you will learn to learn how to critically evaluate soil dating methods that are currently being used to report carbon accumulation to the US EPA and the Intergovernmental Panel on Climate Change...

Date published: July 17, 2018
Status: Active

A tale of two coasts: tidal marsh persistence with changing climate and sea-level rise- Karen Thorne

The overall goal of this project is to improve our understanding of the combined effects of inundation, due to sea-level rise and storm surges, and other climate factor on tidal marsh physical and biological processes to provide guidance to natural resource managers to reduce these threats and increase resilience.

Date published: July 16, 2018
Status: Completed

A New Map of Rodgers Creek Fault in Sonoma County, California

Release Date: JULY 16, 2018

A new more detailed and higher resolution map of the Rodgers Creek Fault in Sonoma County, California, has been produced using aerial photography and hillshade imagery derived from LiDAR data.

Date published: July 6, 2018
Status: Active

Pesticide Fate Research Group (PFRG)

Pesticides are applied in agricultural and urban areas to control weeds, insects, fungus, and other pests.  Applied pesticides and their degradates can be transported off-site through a variety of mechanisms; these pesticides can then be found in non-target areas. Pesticide transport can occur through the atmosphere, in the aqueous phase (surface and groundwater) and associated with soil/...

Date published: June 27, 2018
Status: Active

Low Intensity Chemical Dosing (LICD)

Rivers, wetlands, and agricultural operations supply natural organic material to the Sacramento-San Joaquin Delta (Delta) and the San Francisco Estuary. This natural organic matter provides many ecosystem benefits, but it also adversely affects drinking water. During drinking water treatment, chlorine added for purposes of pathogen control reacts with dissolved organic carbon (DOC) in the...

Contacts: Tamara Kraus, Phil Bachand
Date published: June 19, 2018
Status: Active

California Water Use

The U.S. Geological Survey's National Water-Use Information Program compiles the nation's water-use data at the county, state, and national levels. USGS five-year reports on national and state water-use estimates between 1950-2015 are posted on the web at: http://water.usgs.gov/watuse/. USGS water-use data for states and counties for...

Contacts: Justin Brandt
Date published: June 14, 2018
Status: Active

Operational CoSMoS model: San Francisco Bay

The San Francisco Bay Coastal Flood Forecast pilot project is an operational CoSMoS model, part of a project funded by the California Department of Water Resources (CA-DWR) and NOAA’s Earth System Research Laboratory (ESRL).

Date published: June 11, 2018
Status: Completed

Slow-Motion Landslides

Release Date: JUNE 11, 2018

Sluggishly-moving earthflows can help us learn what controls the starting and stopping of landslides.

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

CoSMoS (Coastal Storm Modeling System) Central California v3.1 flood-hazard projections: 100-year storm in San Francisco 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

Hydrodynamic and sediment transport data from San Pablo Bay (northern San Francisco Bay), 2011-2012

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

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 water-level projections: 20-year storm in Santa Barbara 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 flood-hazard projections: 20-year storm in San Mateo 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

CoSMoS (Coastal Storm Modeling System) Central California v3.1 flood-hazard projections: average conditions in San Luis Obispo 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

Transgressive Contours--Punta Gorda to Point Arena, California

This part of DS 781 presents data for the transgressive contours of the Punta Gorda to Point Arena, California, region. The vector data file is included in the "TransgressiveContours_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...

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 ocean-currents projections: average conditions 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

Date published: January 1, 2019

Magnetotelluric data from Mountain Pass, CA, 2015

This dataset consists of 65 magnetotelluric (MT) stations collected in 2015 near Mountain Pass, California. The U.S. Geological Survey acquired these data to create a regional conductivity model near the Mountain Pass mine. This work is in support of characterizing mineral deposits.

Date published: January 1, 2019

Structure-from-motion point cloud of Mud Creek, Big Sur, California, 2018-01-29

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 UT

Date published: December 21, 2018

California Flood Activity Alerts

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

Date published: December 19, 2018

Drought & Groundwater in California

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

Date published: December 19, 2018

Runoff Estimates for California

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

Filter Total Items: 350
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Year Published: 2008

The Hayward Fault - Is it due for a repeat of the powerful 1868 earthquake?

On October 21, 1868, a magnitude 6.8 earthquake struck the San Francisco Bay region. Although the region was then sparsely populated, this quake on the Hayward Fault was one of the most destructive in California?s history. Recent studies show that such powerful Hayward Fault quakes have repeatedly jolted the region in the past. U.S. Geological...

Brocher, Thomas M.; Boatwright, Jack; Lienkaemper, James J.; Prentice, Carol S.; Schwartz, David P.; Bundock, Howard
The Hayward Fault - Is It Due for a Repeat of the Powerful 1868 Earthquake?; 2008; FS; 2008-3019; Brocher, Thomas M.; Boatwright, Jack; Lienkaemper, James J.; Prentice, Carol S.; Schwartz, David P.; Bundock, Howard

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Year Published: 2008

The Uniform California Earthquake Rupture Forecast, version 2 (UCERF 2)

California?s 35 million people live among some of the most active earthquake faults in the United States. Public safety demands credible assessments of the earthquake hazard to maintain appropriate building codes for safe construction and earthquake insurance for loss protection. Seismic hazard analysis begins with an earthquake rupture forecast?a...

The Uniform California Earthquake Rupture Forecast, Version 2 (UCERF 2); 2008; OFR; 2007-1437; 2007 Working Group on California Earthquake Probabilities

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Year Published: 2008

Relation between species assemblages of fishes and water quality in salt ponds and sloughs in South San Francisco Bay

This study was conducted to characterize fishery resources inhabiting salt-evaporation ponds and sloughs in South San Francisco Bay, and to identify key environmental variables that influence distribution of fishes. The ponds, which were originally constructed and operated for commercial production of salt, have undergone preliminary modifications...

Mejia, F.; Saiki, M. K.; Takekawa, John Y.
Relation between species assemblages of fishes and water quality in salt ponds and sloughs in South San Francisco Bay; 2008; Article; Journal; Southwestern Naturalist; Mejia, F.; Saiki, M. K.; Takekawa, J. Y.

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Year Published: 2007

Total selenium and selenium species in irrigation drain inflows to the Salton Sea, California, April and July 2007

This report presents the results for two sampling periods during a 4-year monitoring survey to provide a characterization of selenium concentrations in selected irrigation drains flowing into the Salton Sea, California. Total selenium, selenium species, and total suspended solids were determined in water samples, and total selenium was determined...

May, Thomas W.; Walther, Michael J.; Saiki, Michael K.; Brumbaugh, William G.
Total Selenium and Selenium Species in Irrigation Drain Inflows to the Salton Sea, California, April and July 2007; 2007; OFR; 2007-1347; May, Thomas W.; Walther, Michael J.; Saiki, Michael K.; Brumbaugh, William G.

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Year Published: 2007

Preliminary analytical results for ash and burned soils from the October 2007 southern California wildfires

The U.S. Geological Survey (USGS) collected ash and burned soils from about 28 sites in southern California wildfire areas (Harris, Witch, Ammo, Santiago, Canyon and Grass Valley) from Nov. 2 through 9, 2007 (table 1). USGS researchers are applying a wide variety of analytical methods to these samples, with the goal of helping identify...

Plumlee, Geoffrey S.; Martin, Deborah A.; Hoefen, Todd; Kokaly, Raymond F.; Hageman, Philip; Eckberg, Alison; Meeker, Gregory P.; Adams, Monique; Anthony, Michael; Lamothe, Paul J.
Preliminary Analytical Results for Ash and Burned Soils from the October 2007 Southern California Wildfires; 2007; OFR; 2007-1407; Plumlee, Geoffrey S.; Martin, Deborah A.; Hoefen, Todd; Kokaly, Raymond; Hageman, Philip; Eckberg, Alison; Meeker, Gregory P.; Adams, Monique; Anthony, Michael; Lamothe, Paul J.

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Year Published: 2007

Data from theodolite measurements of creep rates on San Francisco Bay region faults, California: 1979-2007

Introduction Our purpose is to update with six additional years of data, our creep data archive on San Francisco Bay region active faults for use by the scientific research community. Earlier data (1979-2001) were reported in Galehouse (2002) and were analyzed and described in detail in a summary report (Galehouse and Lienkaemper, 2003). A...

McFarland, Forrest S.; Lienkaemper, James J.; Caskey, S. John; Grove, Karen
Data from Theodolite Measurements of Creep Rates on San Francisco Bay Region Faults, California: 1979-2007; 2007; OFR; 2007-1367; McFarland, Forrest S.; Lienkaemper, James J.; Caskey, S. John; Grove, Karen

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Year Published: 2007

Simulations of potential runout and deposition of the Ferguson rockslide, Merced River Canyon, California

INTRODUCTION An active rockslide in Merced River Canyon was first noticed on April 29, 2006 when a few rocks rolled onto Highway 140 between mileposts 103 and 104, compromising traffic on this highway and signaling the onset of renewed activity of the Ferguson rockslide. State highway 140 is one of the main entrances to Yosemite National Park...

Denlinger, Roger P.
Simulations of Potential Runout and Deposition of the Ferguson Rockslide, Merced River Canyon, California; 2007; OFR; 2007-1275; Denlinger, Roger P.

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Year Published: 2007

Dissolved solids in basin-fill aquifers and streams in the southwestern United States

The U.S. Geological Survey National Water-Quality Assessment Program performed a regional study in the Southwestern United States (Southwest) to describe the status and trends of dissolved solids in basin-fill aquifers and streams and to determine the natural and human factors that affect dissolved solids. Basin-fill aquifers, which include the...

Anning, David W.; Bauch, Nancy J.; Gerner, Steven J.; Flynn, Marilyn E.; Hamlin, Scott N.; Moore, Stephanie J.; Schaefer, Donald H.; Anderholm, Scott K.; Spangler, Lawrence E.
Dissolved Solids in Basin-Fill Aquifers and Streams in the Southwestern United States; 2007; SIR; 2006-5315; Anning, David W.; Bauch, Nancy J.; Gerner, Steven J.; Flynn, Marilyn E.; Hamlin, Scott N.; Moore, Stephanie J.; Schaefer, Donald H.; Anderholm, Scott K.; Spangler, Lawrence E.

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Year Published: 2007

Earthquake Rate Model 2.2 of the 2007 Working Group for California Earthquake Probabilities, Appendix D: Magnitude-Area Relationships

Summary To estimate the down-dip coseismic fault dimension, W, the Executive Committee has chosen the Nazareth and Hauksson (2004) method, which uses the 99% depth of background seismicity to assign W. For the predicted earthquake magnitude-fault area scaling used to estimate the maximum magnitude of an earthquake rupture from a fault's length...

Stein, Ross S.
Earthquake Rate Model 2.2 of the 2007 Working Group for California Earthquake Probabilities, Appendix D: Magnitude-Area Relationships; 2007; OFR; 2007-1162; Stein, Ross S.

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Year Published: 2007

Near-Surface Structure and Velocities of the Northeastern Santa Cruz Mountains and the Western Santa Clara Valley, California, From Seismic Imaging

Introduction The Santa Clara Valley (SCV) is located in the southern San Francisco Bay area of California and is bounded by the Santa Cruz Mountains to the southwest, the Diablo Ranges to the northeast, and the San Francisco Bay to the north (Fig. 1). The SCV, which includes the City of San Jose, numerous smaller cities, and much of the high-...

Catchings, R.D.; Gandhok, G.; Goldman, M.R.; Steedman, Clare
Near-Surface Structure and Velocities of the Northeastern Santa Cruz Mountains and the Western Santa Clara Valley, California, From Seismic Imaging; 2007; OFR; 2007-1039; Catchings, R. D.; Gandhok, G.; Goldman, M. R.; Steedman, Clare

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Year Published: 2007

Riding the storm--landslide danger in the San Francisco Bay Area

Movie Synopsis: --A catastrophic 1982 rainstorm triggered 18,000 landslides in the Bay Area, claiming 25 lives and causing $66 million in property damage. --The combination of steep slopes, weak rocks, and intense winter storms make Bay Area uplands an ideal setting for landslides. --Landslides include both swift, potentially deadly...

Adams, Karen
Riding the storm--landslide danger in the San Francisco Bay Area; 2007; GIP; 48; Producer/Director/Editor Adams, Karen

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Year Published: 2007

Summary of Survival Data from Juvenile Coho Salmon in the Klamath River, Northern California, 2006

Little is known about the survival of ESA-listed juvenile coho salmon during their seaward migration in the lower Klamath River. In 2006, the Bureau of Reclamation funded a study to estimate the survival of radio-tagged juvenile coho salmon in the Klamath River downstream of Iron Gate Dam. A series of models were evaluated to determine if survival...

Beeman, John W.
Summary of Survival Data from Juvenile Coho Salmon in the Klamath River, Northern California, 2006; 2007; OFR; 2007-1023; Beeman, John W.

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Vista of Buda, Eagle Ford, and Austin Formations, Terrell County, Texas (March 10, 2015)
May 8, 2018

Vista of Buda, Eagle Ford, and Austin Formations, Terrell County

One charge of the U.S. Geological Survey’s Energy Resources Science Center is conducting field work to
better understand the distribution of hydrocarbon source rocks as input to USGS oil and gas
assessments. This 2015 image is a view to the south-southeast of rocks exposed along an unnamed
draw near Antonio Creek, Terrell County, Texas. The Buda Limestone is

...
a lone Joshua tree stands out amongs desert scrub and fluffy clouds in a blue sky
May 2, 2018

Joshua Tree, Edwards Air Force Base, Antelope Valley, CA

Joshua trees dot the desert landscape on Edwards Air Force Base in Antelope Valley, CA.  

Cover of The HayWired Earthquake Scenario—We Can Outsmart Disaster
April 30, 2018

Cover of The HayWired Earthquake Scenario—We Can Outsmart Disaster

Cover of The HayWired Earthquake Scenario—We Can Outsmart Disaster, USGS Fact Sheet 2018-3016

Attribution: Natural Hazards
April 26, 2018

PubTalk 4/2018 - Coral Reefs

Title: The Role of U.S. Coral Reefs in Coastal Protection - Rigorously valuing flood reduction benefits to inform coastal zone management decisions

  • Coral reefs are a first line of coastal defense
  • We can account for the physical defense that reefs provide
  • We can provide value-based information to guide restoration efforts at management-relevant
Photo of absolute-gravity meter next to a groundwater well in the field
April 25, 2018

Changes in Earth's Gravity Reveal Changes in Groundwater Storage

Did you know that changes in the amount of water in aquifers cause small changes in Earth’s gravitational field? When the amount of groundwater in an aquifer changes, either by recharge or by discharge to surface water or wells, the gravitational acceleration at the land surface also changes. In this photo, USGS Research Hydrologist Jeff Kennedy is making measurements of

...
Attribution: Water Resources
April 20, 2018

MODIS and VIIRS Observe Snowpack in the Sierra Nevada Mountain Range

The Moderate Resolution Imaging Spectroradiometer (MODIS) sensor is located onboard NASA’s Terra and Aqua satellites. The Visible Infrared Imaging Radiometer Suite (VIIRS) sensor is located onboard the joint NASA/NOAA Suomi National Polar-Orbiting Partnership (S-NPP) and data products created by NASA provide a continuation of the MODIS data heritage. These data are crucial

View from a rooftop looking down into a cove with gentle ocean waves, coastal bluffs, surfers and anchored boat in distance.
April 19, 2018

Cowells Beach Snapshot

Snapshot, or first frame of from a 10-minute video taken on April 19, 2018, in Santa Cruz, California. View is from atop a hotel looking down on Cowells Beach, a popular surf spot. Researchers at the USGS are using these and other video images to improve understanding and computer modeling of beach processes, especially those that change the coast. 

...
April 18, 2018

HayWired Scenario - Movie

The HayWired earthquake scenario, led by the U.S. Geological Survey (USGS), anticipates the impacts of a hypothetical magnitude-7.0 earthquake on the Hayward Fault. The fault is along the east side of California’s San Francisco Bay and is among the most active and dangerous in the United States, because it runs through a densely urbanized and interconnected region. 

Gas chromatograph-mass spectrometer (GCMS) used for pesticide analysis
April 4, 2018

Gas chromatograph-mass spectrometer (GCMS) used for pesticide analysis

Organic Chemistry Research Laboratory — Sacramento, California. Gas chromatograph-mass spectrometer - GCMS

View from the sky of a marsh labeled with sample locations.
April 2, 2018

Little Holland Tract and Liberty Island sample locations, 2014-2017

Sediment sampling locations in the Sacramento-San Joaquin Delta, California near Little Holland Tract and Liberty Island, 2014 to 2017

Map of California showing the sections of the coast where the USGS has generated computer models of storm impacts.
April 2, 2018

CoSMoS Implementation versions

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.  Resulting projections for future climate scenarios (sea-level rise and storms) provide

...
Comparison maps indicating short or long times available for earthquake shaking arrival times
March 31, 2018

Earthquake Alerts: Early and Often? Or Possibly Late?

The choice when issuing earthquake warnings is to: 1) issue alerts for weak shaking and potentially provide long warning times, but risk sending alerts for the many events that do not go on to produce damaging ground shaking, or 2) issue alerts only when ground shaking is expected to be damaging, with the tradeoff that the alert will be sent much later, reducing the

...
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USGS science for a changing world logo
July 30, 2015

RESTON, Va.— The U.S. Geological Survey has awarded approximately $4 million this week to four universities – California Institute of Technology, University of California, Berkeley, University of Washington and University of Oregon – to support transitioning the “ShakeAlert” earthquake early warning system toward a production stage.

USGS
July 27, 2015

One winter's night in the year 1700, a mysterious tsunami flooded fields and washed away houses in Japan. It arrived without the warning that a nearby earthquake usually provides.

Image: U.S. Fish and Wildlife Service Vessel Seen Through Bird Flock
July 16, 2015

The U.S. Geological Survey today released the North Pacific Pelagic Seabird Database — a massive online resource compiling the results of 40 years of surveys by biologists from the United States, Canada, Japan and Russia. The database documents the abundance and distribution of 160 seabird and 41 marine mammal species over a 10 million-square-mile region of the North Pacific.

Issue3.5May2015Thumb
June 5, 2015

The Delta – Developing Models to Understand Fish Passage and Survival In a Complex System

Drought effects at Trinity Lake
May 28, 2015

Although record low precipitation has been the main driver of one of the worst droughts in California history, abnormally high temperatures have also played an important role in amplifying its adverse effects, according to a recent study by the U.S. Geological Survey and university partners.

USGS science for a changing world logo
May 26, 2015

Recently, U.S. Geological Survey researchers and partners working in California’s Channel Islands National Park discovered mammoth remains in uplifted marine deposits that date to about 80,000 years ago, confirming a long-held but never proven hypothesis that mammoths may have been on the Channel Islands long before the last glacial period 25,000 to 12,000 years ago.

Map of sediment thickness in state waters offshore of San Francisco.
May 21, 2015

Three new sets of maps detail the offshore bathymetry, habitats, geology and submarine environment of the seafloor off the coast of San Francisco, Drakes Bay, and Tomales Point.

Lassen Volcanic National Park, California. Northeast side of Lassen Peak, showing the area devastated by mudflows and a lateral
May 19, 2015

2015 marks the centennial of the May 22, 1915 explosive eruption of Lassen Peak.

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April 22, 2015

Everyone knows that California is “earthquake country,” but it is also “volcano country.” The most recent large volcanic eruption in California was 100 years ago at Lassen Peak, in what is now Lassen Volcanic National Park. California is much different today than it was 100 years ago; in 1915 there were no deaths, no injuries, and minimal economic losses due to the eruption.

USGS
April 14, 2015

The U.S. Geological Survey and Clear Channel Outdoor today announced a partnership to provide the public with critical earthquake safety information during April.

Image: Tsunami Evacuation Sign
April 13, 2015

Tens of thousands of people along the U.S. Pacific Northwest coastline may not have enough time to evacuate low-lying areas before tsunami waves arrive, according to a new publication by researchers at the U.S. Geological Survey, University of Colorado Boulder, and California State University, Sacramento.

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