States L2 Landing Page Tabs

Filter Total Items: 360
Fish sampling sites in the San Joaquin River
Date Published: February 23, 2015
Status: Active

Application of the SmeltCam to Describe Processes Influencing Delta Smelt Distribution and Movements

The California Water Science Center's "SmeltCam" helps describe processes influencing Delta Smelt distribution and movement.

Tule Perch
Date Published: January 1, 2015
Status: Active

Understanding Influences on Habitat Quality for Delta Smelt and Other Imperiled Fish Populations

USGS scientists work to provide information needed to evaluate the efficacy of ongoing U.S. Burueau of Reclamation water management efforts in Bay-Delta.

Informational graphic showing data in pie graphs, text, and maps
Date Published: August 4, 2014
Status: Completed

California Water Use, 2010

In 2010, Californians withdrew an estimated total of 38 billion gallons of water per day, compared with 46 billion gallons per day in 2005.

Contacts: Justin Brandt
Longfin Smelt
Date Published: May 15, 2014
Status: Active

Physical and Biological Drivers of Longfin Smelt Vertical Distribution

Research scientists study conditions that affect abundance and distributions Longfin Smelt fish population.

Map of Christ Church, NZ aftershocks
Date Published: April 19, 2014
Status: Active

Aftershock Forecast Communication for Risk Reduction

Studies of the communication of aftershock information during the Canterbury, New Zealand earthquake sequence conducted by Hazards Societal Consequences and Risk Communication team members and collaborators in New Zealand are...

Tsunami Scenario
Date Published: September 4, 2013

Tsunami Scenario

The SAFRR Tsunami Scenario is a hypothetical but plausible tsunami created by a magnitude 9.1 earthquake offshore of the Alaskan peninsula. The scenario report was released September 2013 and provides an analysis of the potential impacts along the California coast, intended for those who need to make mitigation, preparedness, and outreach decisions before and after tsunami impacts.

Tsunami Scenario Wave Height
Date Published: September 4, 2013
Status: Completed

SAFRR Tsunami Scenario

The third SAFRR scenario is initiated by a magnitude 9.0 megathrust earthquake in the eastern Aleutian Islands, an event presenting a hypothetical but plausible distant-tsunami threat to southern and central California. USGS and other federal and state agencies entities developed the SAFRR Tsunami Scenario. The scenario describes wave heights, current velocities and inundation for the coast of...

Date Published: August 8, 2013
Status: Completed


The SAFRR project’s second scenario, called ARkStorm, addresses massive U.S. West Coast storms analogous to those that devastated California in 1861–62. Storms of this magnitude are projected to become more frequent and intense as a result of climate change. The SAFRR project assembled experts from scientific research agencies to design the large, but scientifically plausible, hypothetical...

red water flowing in a very rocky streambed
Date Published: May 24, 2013
Status: Active

Iron Mountain: An Extraordinary and Extreme Environment

At its peak production, Iron Mountain ranked as the tenth largest copper production site in the world, sixth in the U.S. and first in California. During its operation, from 1879 - 1963, ten different mines throughout the site's 4,400 acres were the source of not just copper, but also silver, iron, gold, zinc and pyrite (iron sulfide).

A century of active mining at Iron Mountain took an...

A screen shot of Delta Skelta serious game
Date Published: April 19, 2013
Status: Completed

Serious Games for Science

Serious or pedagogical games are an engaging way to educate decisionmakers and stakeholders about environmental challenges that are usefully informed by natural and social scientific information and knowledge. USGS designed two serious games intended to promote interactive learning and exploration in the face of large uncertainties, divergent values, and complex situations. Delta Skelta...

UAS discharge measurement Tanana River Train Bridge AK
Date Published: March 1, 2013
Status: Active

SWOT - Surface Water and Ocean Topography

Satellite altimetry associated with the Surface Water and Ocean Topography (SWOT) mission offers a solution for measuring (1) river stage and slope, (2) water surface area including mean channel width and (3) derivatives such as river discharge. The measurements can be used to track changes in these variables and provide an accounting of the Earth's fresh-water bodies from space at the reach...

Contacts: John W Fulton
map of the central valley with the CVHM grid cells overlaid, and a cross section of the subsurface
Date Published: August 27, 2012
Status: Active

Central Valley Hydrologic Model (CVHM)

In an effort to aid water managers in understanding how water moves through the aquifer system, predicting water-supply scenarios, and addressing issues related to water competition, the USGS developed a new hydrologic modeling tool, the Central Valley Hydrologic Model (CVHM). The CVHM is an extensive, detailed three-dimensional (3D) computer model of the hydrologic system of the Central...

Contacts: Claudia C Faunt
Filter Total Items: 1,143
Large waves crashing on rocks at beach.
December 31, 2016

Storm waves in Santa Cruz

Large storm waves crashing on the rocks near Santa Cruz, California

map of San Joaquin Valley shaded by 2008-2010 subsidence in millimeters
December 31, 2016

Subsidence (2008-2010), San Joaquin Valley, California

Map showing estimated regions of subsidence derived from interferograms for 2008–2010 and selected surface-water conveyance infrastructure in the San Joaquin Valley area of the Central Valley, California.

Map of the seafloor showing its characteristics which include long, linear features that are earthquake fault zones.
December 31, 2016

Offshore of Point Estero

Seafloor offshore of Point Estero (PE) showing east (EH) and west (WH) strands of the Hosgri fault zone. Arrow points to a seafloor slope (a 12,000 year old shoreline) that has been offset by the east Hosgri strand, indicating a slip rate of about 2.6 millimeters per year.

banding of Panum pumice and obsidian
December 31, 2016

Flow banding of Panum pumice and obsidian

Flow banding of Panum pumice and obsidian of the same composition.

Yosemite Toad
December 31, 2016

Yosemite Toad Vocalization

Amphibians’ permeable skin makes them incredibly sensitive to changes in their environment. Scientists and conservationists alike are using them as “sentinel species” that could provide early warnings of ecosystem change and stress affecting them and other organisms. Next time you are out, stop and listen. Do you hear them?

September 26, 2016 earthquake locations (circles) of ongoing swarm north of Salton Buttes, California. SCSN seismometers located
December 31, 2016

Ongoing swarm north of Salton Buttes, California

September 26, 2016 earthquake locations (circles) of ongoing swarm north of Salton Buttes, California. SCSN seismometers located by triangles.

Image shows a sample of elbaite on a black background
December 31, 2016


Elbaite is one of the best-known members of the tourmaline mineral family, particularly for its high-quality gemstones. Read more about the tourmaline mineral family here

Sample provided by Carlin Green, USGS. Sample originated from Himalaya Mine, California, and is 4

man pointing to image on computer screen in an office setting
December 31, 2016

Geologist explains photo analysis of Calif. coastal cliffs

USGS research geologist Jon Warrick explains how his team applied structure-from-motion analysis to photos from the California Coastal Records Project to measure coastal change. Jon Warrick explains a “difference map” constructed from structure-in-motion data. Red areas indicate loss of material (erosion); blue areas show addition of material (deposition).

Map of the San Joaquin Valley displaying contours of land subsidence that occurred from 2008 to 2010.
December 31, 2016

2008-2010 Land Subsidence Contours, San Joaquin Valley, California

Land subsidence contours showing vertical changes in land surface in the central San Joaquin Valley area, California, during January 8, 2008-January 13, 2010. The top graph illustrates elevation changes computed from repeat geodetic surveys along Highway 152 for 1972-2004. The bottom graph depicts elevation changes computed from repeat geodetic surveys along the Delta-

Kings Canyon view
December 31, 2016

Kings Canyon landscape

Grass/shrub landscape with mountains in background. Taken as part of the Land-cover Trends Project field verification process.

Map of offshore southern California showing the contours of the seafloor, with labels pointing to circles showing landslides.
December 31, 2016

Large submarine slides off southern California

Large submarine slides off southern California (outlined in small white dots). Low-resolution bathymetry shown in light grey (approximately 100 meters/pixel). High-resolution bathymetry shown in darker grey (less than 20 meters/pixel).

Filter Total Items: 906
August 16, 2012

MENLO PARK, Calif. — Residents should not be alarmed to witness a low-flying airplane over the northern Sacramento Valley and surrounding hills starting around August 17. 

August 15, 2012

MENLO PARK, Calif. —The U.S. Geological Survey is reducing its footprint in Menlo Park to lower rent costs. The move is part of a larger consolidation plan motivated by the Presidential directive to reduce government space utilization. There is not a plan to reduce staff, and the USGS will continue to maintain all operations currently housed in Menlo Park.

Taking GPS coordinates at the Amargosa Desert Research Site
July 24, 2012

Summer is the time when most CalVO scientists get out into the field to conduct geologic and ground-based monitoring investigations of our regional volcanoes.

July 23, 2012

Dr. Joseph Colgan, a research geologist with the U.S. Geological Survey, was named one of President Obama's recipients of the Presidential Early Career Award for Scientists and Engineers, the highest honor bestowed by the United States government on science and engineering professionals in the early stages of their independent research careers.

July 23, 2012

Dr. Karen Felzer, a geophysicist with the U.S. Geological Survey, was named one of President Obama's recipients of the Presidential Early Career Award for Scientists and Engineers, the highest honor bestowed by the United States government on science and engineering professionals in the early stages of their independent research careers. 

July 17, 2012

SAN DIEGO, Calif. — Nitrate was detected at high concentrations in one quarter of the aquifer system used for Inland Empire public water supply. Additionally, high concentrations of perchlorate were found in 11 percent of the aquifer system, and in moderate concentrations in 53 percent. This aquifer system includes the Upper Santa Ana Valley, San Jacinto, and Elsinore groundwater...

June 26, 2012

Tools, Resources for Earthquake Readiness and Emergency Management To Be Shared, Explained by U.S. Geological Survey Scientists at Conference at Caltech

June 26, 2012

MENLO PARK, Calif. —Throughout the United States, June is recognized as National Oceans Month.  This Thursday, the U.S. Geological Survey invites the public to a lecture entitled "Scanning the Seafloor with Sound." 

June 5, 2012

California, Louisiana and Mississippi join the more than 40 states covered by the US Topo

May 30, 2012

MENLO PARK, Calif. —May is American Wetlands Month. Hear how U.S. Geological Survey scientists are supporting the ongoing restoration efforts to improve South Bay wetlands for endangered species and migratory birds, as well as conducting studies to better understand this wetland ecosystem, and how adaptive management practices will be working over the coming decades to restore...

May 29, 2012

MENLO PARK, Calif. – 100 years ago, in June 1912, the largest volcanic eruption of the 20th century took place in what is now Alaska's Katmai National Park and Preserve. U.S. Geological Survey geologist Judy Fierstein, co-author of a new landmark study on this huge volcanic event, shares her work with the community in a free public lecture Wednesday, June 6, a century to the...

May 28, 2012

SANTA CRUZ, Calif. — The results of an innovative collaboration that paired artists from California’s central coast and the greater San Francisco Bay Area with scientists from the U.S. Geological Survey’s Pacific Coastal and Marine Science Center, will be on display at the R. Blitzer Gallery in Santa Cruz June 1 through July 7.