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: 1,120
map of the central valley with the CVHM grid cells overlaid, and a cross section of the subsurface
December 31, 2009

Central Valley Hydrologic Model (CVHM)

The Central Valley Hydrologic Model (CVHM) is built on knowledge from USGS and other Federal, State, and local studies. The CVHM was constrained by comparing simulated and historically observed groundwater levels, streamflows, and subsidence. The detail and breadth of this hydrologic modeling tool provides a better understanding of valleywide hydrologic processes. This

...
December 10, 2009

PubTalk 12/2009 — A New Generation of Maps

Topographic Maps for the 21st Century

by Mark DeMulder, Director of the National Geospatial Program

 

  • December 5 marks the 125th Anniversary of the popular USGS topographic map, used by engineers and surveyors, industry, academia, and outdoor enthusiasts for reliably accurate information
  • Starting December 3 the
December 8, 2009

Inside USGS No. 1, Robert Christiansen, Yellowstone

USGS emeritus geologist Robert Christiansen describes his career working on Yellowstone geology from the 1960's through 2014. Bob's work along with his USGS colleagues revealed the details of Yellowstone's explosive volcanic past including mapping and dating of past super eruptions 2.1 million years ago, 1.3 million years ago and 640,000 years ago.

Attribution: Yellowstone
December 8, 2009

Inside USGS, No. 3, Robert Fournier, Yellowstone

USGS emeritus geologist RobertFournier describes his career working on Yellowstone geysers and hydrothermal systems from the 1960's through 2014. Bob's work along with his USGS colleagues revealed the details of Yellowstone's explosive volcanic past and how its spectacular geysers and other hydrothermal features work.

Attribution: Yellowstone
November 19, 2009

PubTalk 11/2009 — Geohazards in the Aleutian Islands

Great Earthquakes, Great Waves, and Great Volcanic Explosions!

by Steve Kirby, Geophsicist, and Dave Scholl, Scientist Emeritus

 

  • The Aleutian Islands are discussed with respect to geology, climate change, and the fates of sediments produced by mountain building and glaciation
  • These islands, occupied by maritime
Attribution: Region 11: Alaska
Small silver metal boat with USGS lettering on the side, water is splashing up on the side and a small wake is formed.
November 18, 2009

PCMSC research vessel Parke Snavely

The USGS Pacific Coastal and Marine Science Center, located in Santa Cruz, California, owns and operates the research vessel R/V Parke Snavely to collect data and run surveys.

October 29, 2009

PubTalk 10/2009 — Paddling for a Purpose in a Troubled Sea

Sampling the Salish Sea During Tribal Canoe Journeys

by Eric Grossman, USGS Tribal Journey Science Advisor

 

  • Deteriorating water quality in Puget Sound and the Strait of Georgia is causing population declines in valued species such as salmon, orcas, and a number of sea birds
  • USGS scientists and the Coast Salish
September 24, 2009

PubTalk 9/2009 — Meeting the Challenge of the Loma Prieta Earthquake

by Jack Boatwright, USGS Seismologist

The 1989 Loma Prieta earthquake ended decades of seismic tranquility in the San Francisco Bay region. It was considered then . as well as now . to be a wake-up call for the region to prepare for potentially even more devastating earthquakes. How well is the Bay Area prepared for the next large earthquake?

August 27, 2009

PubTalk 8/2009 — The Future of Geothermal Energy

a discussion of present opportunities and future challenges

by Colin F. Williams, USGS Geophysicist 

  • A new USGS assessment of our Nation.s geothermal resources identifies favorable areas for energy development
  • Can geothermal energy help satisfy the growing need for .clean. energy sources?
  • Seven western states
Hydrologist observes groundwater being pumped from a well in the desert
August 26, 2009

Checking the Hydraulic Connections between a Well and Aquifer

A USGS Hydrologist re-develops a monitoring well to ensure a good hydraulic connection is present between the perforations in the well and surrounding aquifer.  This work was being done as part of a groundwater system characterization and groundwater quality study being conducted along the All-American Canal that runs through the area.

Hydrologist collecting water samples from a large well pipe
August 25, 2009

Water-Quality Sample Collection

A USGS Hydrologist collects water-quality samples as part of a wellbore characterization test at site LCWSP2 of the Forecasting Total Dissolved Solids Concentrations of Groundwater from the Lower Colorado Water Supply Project study.

Hot Creek Gorge viewed upstream toward the southwest; the steep wal...
August 17, 2009

Hot Creek Gorge viewed upstream toward the SW; the steep walls of t...

Hot Creek Gorge viewed upstream toward the southwest; the steep walls of the gorge consist of a single rhyolite lava flow erupted from a vent 4 km (2.5 mi) to the south.

Filter Total Items: 980
USGS science for a changing world logo
November 20, 2002

An in-depth analysis of major long-term research on the San Andreas fault indicates that parts of the fault are likely to experience a major temblor sooner than previously believed, including the section near Palm Springs and the San Bernardino-Riverside areas, and the Hayward fault in the Bay Area.

USGS
November 20, 2002

An in-depth analysis of major long-term research on the San Andreas fault indicates that parts of the fault are likely to experience a major temblor sooner than previously believed, including the section near Palm Springs and the San Bernardino-Riverside areas, and the Hayward fault in the Bay Area.

USGS
October 15, 2002

On September 23, pintail 17530’s backpack transmitter beamed a signal from the southwest coast of Alaska to a satellite. She was flying south, 272 days after USGS scientists equipped her with a PTT, or platform transmitter terminal, last winter in California’s Central Valley, where nearly half of North America’s pintails winter.

USGS science for a changing world logo
August 9, 2002

 

John D. Buffington, Western Regional Director for the U.S. Geological Survey (USGS) announced today that Rey Stendell has been named Chief Scientist for the Salton Sea Science Office (SSSO) in La Quinta, California.

USGS
August 9, 2002

John D. Buffington, Western Regional Director for the U.S. Geological Survey (USGS) announced today that Rey Stendell has been named Chief Scientist for the Salton Sea Science Office (SSSO) in La Quinta, California. 

USGS science for a changing world logo
July 24, 2002

It’s 2 in the morning, about a mile off the coast of Redwood National and State Parks in Humboldt County, California, near the northernmost part of the state. In the pitch-black night, researchers talk quietly while they wait aboard the RV Coral Sea, a 90-foot Humboldt State University research vessel.

USGS
July 24, 2002

It’s 2 in the morning, about a mile off the coast of Redwood National and State Parks in Humboldt County, California, near the northernmost part of the state. In the pitch-black night, researchers talk quietly while they wait aboard the RV Coral Sea, a 90-foot Humboldt State University research vessel.

USGS science for a changing world logo
July 3, 2002

 

When USGS scientist Dr. Kevin Lafferty visits a salt marsh at low tide, he sees much more than algae-green tinted mudflats, tidal sloughs and brine-adapted pickleweed. Like other visitors, he sees the bustle of life around the mudflats from clams, snails, and crabs, to shorebirds and long-legged waders, and gobies and killifish in the shallows of the estuary.

USGS
July 3, 2002

When USGS scientist Dr. Kevin Lafferty visits a salt marsh at low tide, he sees much more than algae-green tinted mudflats, tidal sloughs and brine-adapted pickleweed.

USGS science for a changing world logo
June 24, 2002

An international research team announced Monday it has begun drilling a 1.4-mile-deep hole along the San Andreas Fault near the Central California town of Parkfield - site of one of the longest ongoing earthquake experiments in the world.

USGS
June 24, 2002

An international research team announced Monday it has begun drilling a 1.4-mile-deep hole along the San Andreas Fault near the Central California town of Parkfield - site of one of the longest ongoing earthquake experiments in the world.

USGS science for a changing world logo
June 20, 2002

The application of the pesticide diazinon on orchards, and the amounts found in rivers and streams in the Sacramento and San Joaquin Basins in Northern California, were considerably lower in 2000 than in the 1990s according to two recently released reports by the U.S. Geological Survey (USGS).