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: 1,076
The California Aqueduct
December 31, 2006

Aqueducts move water in the past and still today, as in California

Aqueducts move water - today and in ancient times

Be it 2,000 years ago in ancient Rome, Italy or today in California, aqueducts were and are essential to get water from a place where it exists in ample supply to where it is scarce. Aqueducts aren't a high-tech modern invention—the ancient Romans had aqueducts to bring water from the mountains above

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An oblique illustration of the floor of a bay as if all the water has been drained out.
December 31, 2006

Multibeam bathymetry of San Francisco Bay

A multibeam bathymetric survey that produced unprecedented high resolution images of the mouth of San Francisco Bay was conducted in 2004 and 2005. The survey, performed over forty-four days by the Seafloor Mapping Lab at California State University, Monterey Bay, consisted of 1,138 track lines, 1.1 billion soundings, and covered an area of 154 km2 (60 mi2

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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 - 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
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,
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
Filter Total Items: 963
USGS
April 17, 2001

Eyewitness accounts of the 1906 earthquake in San Francisco agree on a number of striking points, according to Jack Boatwright of the U.S. Geological Survey.

USGS science for a changing world logo
April 16, 2001

On the 95th anniversary of the great San Francisco earthquake, scientists from the U.S. Geological Survey will join their colleagues in the Seismological Society of America (SSA) to discuss new findings on the 1906 earthquake that devastated San Francisco; the Nisqually earthquake that lightly slapped the Seattle-Tacoma area six weeks ago; and several other large earthquakes.

USGS
April 16, 2001

On the 95th anniversary of the great San Francisco earthquake, scientists from the U.S. Geological Survey will join their colleagues in the Seismological Society of America (SSA) to discuss new findings on the 1906 earthquake that devastated San Francisco;

USGS science for a changing world logo
April 6, 2001

A number of researchers from the U.S. Geological Survey will join about 900 of their fellow geoscientists from around the world to discuss updates and unanswered questions about the Northridge earthquake and new earthquake possibilities in southern California 

USGS
April 6, 2001

A number of researchers from the U.S. Geological Survey will join about 900 of their fellow geoscientists from around the world to discuss updates and unanswered questions about the Northridge earthquake and new earthquake possibilities in southern California

USGS science for a changing world logo
March 22, 2001

There’s good news and bad news for the Sacramento River system, according to a new report from the U.S. Geological Survey. "The water quality of the Sacramento River and its major tributaries, such as the Feather and American rivers, is generally healthful for drinking and irrigation water, recreation, and the protection of fish and other aquatic life," said USGS Project Manager,Joseph Domagalski.

USGS
March 22, 2001

There’s good news and bad news for the Sacramento River system, according to a new report from the U.S. Geological Survey.

USGS science for a changing world logo
March 21, 2001

The highly developed and urbanized area of coastal southern California is host to one of the richest regions of amphibians and reptiles in the United States, and includes several species with state- and federal-protected status.

USGS
March 21, 2001

With more than 400,000 volumes and 35,000 maps, the library of the U. S. Geological Survey, at 345 Middlefield Road, Menlo Park, is the largest earth-science library on the West Coast, and part of the largest earth sciences library system in the world.

USGS
March 21, 2001

The highly developed and urbanized area of coastal southern California is host to one of the richest regions of amphibians and reptiles in the United States, and includes several species with state- and federal-protected status.

USGS science for a changing world logo
March 20, 2001

Power outages that may occur on the San Francisco peninsula will not affect the earthquake monitoring ability of the U.S. Geological Survey in Menlo Park.

USGS
March 20, 2001

Power outages that may occur on the San Francisco peninsula will not affect the earthquake monitoring ability of the U.S. Geological Survey in Menlo Park.