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: 1,121
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
May 25, 2006

PubTalk 5/2006 — What Lies Beneath?

Concealed sedimentary basins and hidden oil under Silicon Valley

By Richard G. Stanley, Geologist 

 

  • Before computers and cubicles there were orchards-- and a few oil wells, too
  • Learn about the "oil boom" in Los Gatos about 100 years ago
  • See how historical records from old oil wells, together with modern
Image: Killdeer
May 23, 2006

Killdeer

Birds found in and around the Salton Sea, California.

Attribution:
Photo of a fallow field with exurban development in the background
May 1, 2006

Fallow field with exurban development in the background in CA

Fallow field with exurban development in the background in California. This photo was taken for the Trends Landcover project during field work. 

April 27, 2006

PubTalk 4/2006 — California's Greatest Fault

How historical data from 1906 have shed light on the San Andreas Fault

By Carol S. Prentice, Geologist 

 

  • What insights are gained from merging original 1906 observations and field notes with today's earthquake science?
  • Data collected during and after the catastropic 1906 earthquake prove to be essential to-
Filter Total Items: 973
USGS
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.

USGS
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.

USGS
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.

USGS
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.

USGS
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." 

USGS
April 14, 2000

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

USGS
April 7, 2000

The Hector Mine earthquake that occurred Oct. 16, 1999, in the Mojave Desert east of Los Angeles, woke a lot of people up but injured no one and caused a minimal amount of property damage.

USGS
April 5, 2000

The rhododendrons and azaleas that create a spectacular display of color each year at the U.S. Geological Survey in Menlo Park, will be at their peak for the next few weeks, and many of the exotic plants will be at their best when the USGS holds its triennial Open House, May 13 and 14, at the center at 345 Middlefield Road in Menlo Park.

USGS
March 22, 2000

The most acidic waters ever measured are percolating through an underground mine near Redding, Calif., according to scientists with the U.S. Geological Survey.

USGS
March 15, 2000

Recent rains may have made things unstable on some parts of San Bruno Mountain, south of San Francisco, but one fault the mountain doesn’t have is a fault; at least none that will cause any problems, according to scientists at the U.S. Geological Survey.

USGS
February 29, 2000

If certain employees of the U.S. Geological Survey are begging for used tennis balls, it must mean that something big is brewing. And it is.

USGS
January 24, 2000

On January 26, 1700, the largest earthquake known to have occurred in the "lower 48" United States, rocked Cascadia, a region 600 miles long that includes northern California, Oregon, Washington, and southern British Columbia.