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: 1,119
A map of ShakeOut scenario shaking in southern California
December 31, 2008

A map of ShakeOut scenario shaking in southern California

A map of ShakeOut scenario shaking in southern California.

Shaded relief map (shades of gray) of part of Berkeley, Calif, including locations of Hayward Fault and Cal stadium
December 31, 2008

Lidar shaded relief map of the Hayward Fault and UC Berkeley stadium

A filtered vertical laser image, taken using a technique called light detection and ranging (LIDAR), of part of the Hayward Fault (red lines) in the City of Berkeley. The fault passes through the University of California Berkeley football stadium (left), and past earthquake movements have significantly offset Hamilton Gulch (center). Arrows show relative movement on

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2 side-by-side maps showing amount of ground shaking in 1868 & 1989 earthquakes. Yellow is light shaking. Reds are stronger shak
December 31, 2008

ShakeMaps for the 1868 Hayward Quake and the 1989 Loma Prieta Quake

ShakeMap showing the inferred intensity of ground shaking in the 1868 earthquake (measured as MMI, or Modified Mercalli Intensity), compared to a ShakeMap for the 1989 magnitude 6.9 Loma Prieta earthquake. Red lines are major earthquake faults; black line shows the portion of the Hayward Fault that ruptured in 1868; diamonds show locations of damage reports (1868) and

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December 31, 2008

Fly Over the Seafloor of San Francisco Bay

Virtual fly-through of San Francisco Bay revealing the seafloor as if the water was drained from the Bay. The movie flies through the south and central Bay, pausing over prominent seafloor features including, large sand waves, rock pinnacles, current scour pits, as well as many human impacts on the seafloor.

December 18, 2008

PubTalk 12/2008 — Gemstone Deposits of the United States

Commercial production - localities visited by mineral collectors

by Pete Modreski, USGS Gemstone Specialist

 

  • Gemstones found in the United States include sapphire, opal, tourmaline, aquamarine, turquoise, amethyst, peridot, and many others
  • More than a half-dozen states are known for their gemstones, including
November 13, 2008

PubTalk 11/2008 — Taking the Biological Pulse of Our Planet

The USA National Phenology Network

by Jake Weltzin, NPN Executive Director

 

  • Phenology, an emerging integrated science, is combining government, university, and public knowledge to study seasonal cycles in the biosphere
  • Recent findings in phenology are providing new insights into the timing of biological events
November 7, 2008

Preparedness Now

This film depicts the realistic outcome of a hypothetical, but plausible, magnitude 7.8 earthquake on the San Andreas fault in Southern CA.

Stream Gage on the eastern bank of the Salton Sea now sits out of the water due to retreating shoreline.
November 3, 2008

Stream Gage sits high and dry on the eastern shore of the Salton Sea

Stream gage #10254005 located near Westmorland, CA, on the eastern shore of the Salton Sea, now sits out of the water as the Salton Sea continues to evaporate and the shoreline retreats.

October 30, 2008

PubTalk 10/2008 — Prehistoric Packrat Piles

Archives of Climate Change

by Kenneth Cole, USGS Research Ecologist

 

  • Piles of ancient vegetation hoarded by packrats are providing clues to past events of rapid climate warming -- similar to those expected for the 21st century
  • Preserved material shows the effects of three sudden warming events that occurred over
People stand on the stern of a boat while launching equipment into the water.
October 23, 2008

Deploying the poking eyeball

USGS scientists from the Pacific Coastal and Marine Science Center (PCMSC) in Santa Cruz, California deploy an instrument called the poking eyeball. The system, developed by PCMSC, was designed to take repetitive microscopic images of the seabed from a tripod on the seafloor. The images record changes in seabed sediment over

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October 14, 2008

Groundshaking animation: Hayward Fault, Oakland epicenter

Scenario shows the ground shaking for a magnitude 7.0 earthquake on the Hayward fault with the epicenter in Oakland, California. Visit M7.0 Earthquake Scenarios - Hayward Fault for detailed perspective views.  

Attribution: Natural Hazards
Filter Total Items: 992
USGS
December 13, 2001

Stress changes produced by the 1906 San Francisco earthquake had a profound effect on Bay Area seismicity by dramatically reducing it in the 20th century, according to David Schwartz, of the U.S. Geological Survey in Menlo Park, Calif. 

USGS
December 13, 2001

Nearly 300 scientists from the U.S. Geological Survey will present papers and posters describing their earth-science research, during the annual meeting of the American Geophysical Union (AGU), at the Moscone Convention Center in San Francisco, December 10 – 14. 

USGS
December 13, 2001

There is science and there is spirit. Sometimes the two twine at apt times. So it is that, in the spirit of an ancient, but ageless Santa Claus, the General Grant Tree-- officially designated in 1926 as the Nation’s Christmas tree by President Calvin Coolidge -- just keeps getting younger.

USGS science for a changing world logo
December 10, 2001

Of Alaska’s several-thousand valley glaciers, including nearly 700 that are named, fewer than 20 are advancing, according to a major study that U.S. Geological Survey (USGS) scientist Bruce F. Molnia will present at the American Geophysical Union Annual 2001 Fall Meeting, scheduled for Dec. 10-14 in San Francisco, CA.

USGS
December 10, 2001

We know that global atmospheric CO2 concentrations are increasing and we are reasonably confident in our estimates of the sources.

USGS science for a changing world logo
December 6, 2001

They really do "give a wrap" at the U.S. Geological Survey in Menlo Park. In fact they are giving away outdated topographical maps that can be used for holiday gift wrap, just for visiting the agency’s map sales outlet at 345 Middlefield Road in Menlo Park, between now and December 22.

USGS
December 6, 2001

They really do "give a wrap" at the U.S. Geological Survey in Menlo Park. In fact they are giving away outdated topographical maps that can be used for holiday gift wrap, just for visiting the agency’s map sales outlet at 345 Middlefield Road in Menlo Park, between now and December 22.

USGS
November 27, 2001

Understanding the natural role of fire in chaparral ecosystems is necessary to effectively manage fires in southern California’s shrublands, where large, high-intensity fires sweep the landscape each year, threatening lives and homes.

USGS science for a changing world logo
November 7, 2001

Think of southern California, and images of beach, sun and surf come to mind, coupled with boundless recreation opportunities for beach-goers. What’s missing from these images? It could be the shorebirds that cavort at the edge of the sea and sand.

USGS
November 7, 2001

Think of southern California, and images of beach, sun and surf come to mind, coupled with boundless recreation opportunities for beach-goers. What’s missing from these images? It could be the shorebirds that cavort at the edge of the sea and sand.

USGS science for a changing world logo
October 29, 2001

In observance of National Geography Awareness Week, November 11-17, the U.S. Geological Survey in Menlo Park will host a GIS (Geographic Information System) Day event for students of local elementary and high schools.

USGS
October 29, 2001

In observance of National Geography Awareness Week, November 11-17, the U.S. Geological Survey in Menlo Park will host a GIS (Geographic Information System) Day event for students of local elementary and high schools.