Unified Interior Regions


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: 1,119
Photo of SBCC wells looking east
December 14, 2006

San Bernardino, Cone Camp Multiple-depth Monitoring Well Sites

Looking east towards USGS Site ID: 340541117074401-6, Site Name: 001S002W07Q001S-6S, Local name: SBCC 1-6 in San Bernardino County, California.

December 14, 2006

PubTalk 12/2006 — The Mojave National Preserve

Geology and Water Shape Desert Plant Communities

by David Miller, Geologist and John Nimmo, Soil Hydrologist


  • One of the largest units in the National Park System, the Mojave National Preserve was established in 1994
  • The Preserve encompasses great sand dunes (including "singing sands"), young volcanic features,
December 14, 2006

PubTalk 12/2006 - Mojave

Title: The Mojave National Preserve: Geology and Water Shape Desert Plant Communities 

  • One of the largest units in the National Park System, the Mojave National Preserve was established in 1994
  • The Preserve encompasses great sand dunes (including "singing sands"), young volcanic features, forests of Joshua trees, and fields of
November 16, 2006

PubTalk 11/2006 — Drills, Spills, and Chills

The inside story on USGS estimates of Alaskan oil and gas resources

by Ken Bird and Rick Stanley, Geologists


  • See the basic elements of a petroleum system.where the oil comes from and where it goes
  • USGS resource assessments in Alaska have a long history and have changed over time
  • Learn how the newest
October 26, 2006

PubTalk 10/2006 — The Parkfield 2004 Earthquake

Lessons From the Best-Recorded Quake in History

by Andy Michael, Geophysicist


  • To record high-quality measurements close to a large earthquake, the right instruments have to be in the right place at the right time
  • Such a convergence happened, for the fi rst time ever, on September 28, 2004, when a magnitude 6
Image: Salton Sea Sunset
October 1, 2006

Salton Sea Sunset

Sunset on the southeast side of the Salton Sea, CA.

September 28, 2006

PubTalk 9/2006 — Water Odysseys

Surface-water and ground-water flow in the Santa Clara Valley

by Randall T. Hanson, Research Hydrologist


  • What has deep drilling in the valley found about ground-water flow?
  • A new computer model improves our understanding of water-flow patterns
  • Learn how underground water makes the ground rise and fall
August 28, 2006

PubTalk 8/2006 — Hidden Faults Under Silicon Valley

Do new discoveries change our view of Santa Clara Valley earthquake hazards?

by R. D. Catchings, Geophysicist 

  • Seismic profiles have revealed the valley.s deep structure and previously unknown faults
  • Earthquakes and seismic reflection images suggest some reverse faults beneath the valley that are not seen at the surface
July 27, 2006

PubTalk 7/2006 — Uncovering Silicon Valley

Weaving a tale of three sedimentary basins

by Victoria E. Langenheim, Geophysicist


  • Geophysical probing reveals the geology under Santa Clara Valley
  • What does the new 3-D view tell us about the San Andreas fault system?
  • How does this affect earthquake hazards and ground-water resources?
  • Was the
California vineyard
July 3, 2006

California vineyard

A photo of a California (ecoregion 6) grape vine taken during field verifcation of Land Cover Trends project.

June 29, 2006

PubTalk 6/2006 — Geology on Conveyor Belts

New ideas on Bay Area evolution from a decade of geologic mapping

By Russ Graymer, Geologist


  • What was the Bay Area like during the Age of Dinosaurs?
  • Learn about the distant origins of some rocks seen around the bay
  • Hear how the San Andreas fault system has rearranged the region.
  • Volcanoes in
Filter Total Items: 991
October 26, 2000

An earth-science project that will enable scientists to assess more accurately earthquake hazards and underground water resources in the western Santa Clara Valley area of Los Gatos-Campbell, is now underway. 

September 26, 2000

In a report released today, the U.S. Geological Survey (USGS) has documented elevated levels of mercury in bass and catfish in the Bear and South Yuba River watersheds in the Sierra Nevada of northern California. Mercury is a well-known environmental pollutant that can have serious effects on human health.

September 8, 2000

Drilling of a 1000-foot-deep ground-water monitoring well will get underway in San Jose, Thursday, September 14. 

August 2, 2000

Hailed as the world’s largest water management effort, the CALFED Bay-Delta Program, a partnership between the state of California and the federal government, has announced the assignment of Dr. Samuel N. Luoma, a scientist with U.S. Geological Survey (USGS), as the Interim Science Leader of the CALFED Science Program.

July 9, 2000

Drilling of a 1400-foot-deep, multi-port ground-water monitoring well will get underway in west Long Beach, Monday, July 10.

June 25, 2000

U.S. Geological Survey Director, Dr. Charles ’Chip’ Groat, will deliver the keynote address at Monday’s opening session of the 20th annual user conference of the Environmental Systems Research Institute (ESRI), at the San Diego Convention Center.

June 21, 2000

In response to the Cerro Grande/Los Alamos wildfire, the U.S. Geological Survey has entered into an agreement with the U.S. Army Corps of Engineers to establish a streamflow gage and collect water-quality data from the Rio Grande upstream from Cochiti Reservoir to determine the effects of the fire upon the water system.

June 9, 2000

The spring 2000 survey of 2,317 California sea otters indicates an overall increase by 10.9 percent since the 1999 spring survey of 2,090 individuals.

May 2, 2000

By combining techniques developed by Leonardo da Vinci with today’s computer applications, an artist and two scientists at the U.S. Geological Survey in Menlo Park, Calif., have produced one of the most dramatic and beautiful maps of the United States, ever published.

April 24, 2000

A report summarizing suspended-solids concentrations in San Francisco Bay from October 1997 through September 1998 has been published by the U.S. Geological Survey.

April 21, 2000

A rare opportunity to watch as waterfowl biologists track northern pintail ducks is available by visiting a U.S. Geological Survey website called "Discovery for Recovery." 

April 14, 2000

Workshop on "Restoring Pacific Rivers: Evaluating the Progress of Watershed Restoration for Salmon."