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New liquefaction hazard maps of Santa Clara Valley, Northern California
New hazard maps for communities from San Jose to Palo Alto in Northern California delineate the probability of earthquake-induced liquefaction, based on three scenarios: a magnitude 7.8 on the San Andreas Fault comparable to the 1906 event, a magnitude 6.7 on the Hayward Fault comparable to the 1868 event, and a magnitude 6.9 on the Calavaras... view more... (2009-01-27)

Volcano-like tremors detected deep within Earth's crust near San Andreas
Tremors within the Earth are usually-but not always-related to the activity of a volcano. Now, such vibrations have been recorded nowhere near a volcano, but at a geologic observatory at the San Andreas Fault.   view more (2006-04-13)

Scripps-Led Study Sheds Light on Earthquake Hazard Along San Andreas Fault
New research by a team of scientists from Scripps Institution of Oceanography at UC San Diego and the U.S. Geological Survey (USGS) offers new insight into the San Andreas Fault as it extends beneath Southern California's Salton Sea.   view more (2009-07-28)

Great Indian Ocean earthquake of 2004 set off tremors in San Andreas fault
In the last few years there has been a growing number of documented cases in which large earthquakes set off unfelt tremors in earthquake faults hundreds, sometimes even thousands, of miles away.   view more (2008-12-11)

Discovery sheds new light on cause of earthquakes
Research at the University of Liverpool into a large fault zone in the Atacama Desert in northern Chile has produced new insight into how fluid pressure can cause earthquakes.   view more (2006-12-14)

San Andreas affected by 2004 Sumatran quake
U.S. seismologists have found evidence that the massive 2004 earthquake that triggered killer tsunamis throughout the Indian Ocean weakened at least a portion of California's famed San Andreas Fault.   view more (2009-10-01)

Why do earthquakes stop?
The underlying structure of a fault determines whether an earthquake rupture will jump from one fault to another, magnifying its size and potential devastation.   view more (2008-02-06)

Deep creep means milder, more frequent earthquakes along Southern California's San Jacinto fault
With an average of four mini-earthquakes per day, Southern California's San Jacinto fault constantly adjusts to make it a less likely candidate for a major earthquake than its quiet neighbor to the east, the Southern San Andreas fault, according to an article in the journal Nature Geoscience.    view more (2009-11-09)

Eastern California shear zone puzzles seismologists
Residents and seismologists in Northern California focus on the San Andreas Fault, but a Penn State researcher thinks more questions should be asked about the Eastern California Shear Zone, a fault that ends or dissipates without a clear connection.   view more (2005-10-18)

Getting ready for the 'big one,' researchers make most detailed survey ever of San Adreas Fault
Researchers have completed the most meticulous survey ever made of the San Andreas Fault, and they've found detailed features that nobody could have seen before.   view more (2005-12-07)

Los Angeles enjoying 1,000 year seismic lull
The Los Angeles basin appears to be in a seismic "lull" characterized by relatively smaller and infrequent earthquakes, according to a study in the September issue of Geology.   view more (2007-08-24)

Tremors on southern San Andreas Fault may mean increased earthquake risk
Increases in mysterious underground tremors observed in several active earthquake fault zones around the world could signal a build-up of stress at locked segments of the faults and presumably an increased likelihood of a major quake, according to a new University of California, Berkeley, study.   view more (2009-07-10)

California's central coast earthquake hazards: New information about recently identified faults
Seismologists are re-evaluating the earthquake potential of the Central Coast, a very complex tectonic region located west of the San Andreas Fault, between Monterey Bay and the Western Transverse Ranges.   view more (2009-04-09)

Prelude to an Earthquake?
A geophysicist from the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) has identified possible seismic precursors to two recent California earthquakes, including the 1989 Loma Prieta earthquake that wreaked havoc throughout the Bay Area.   view more (2005-12-12)

San Andreas earthquake observatory achieves milestone as drillers penetrate the active fault zone
The San Andreas Fault Observatory at Depth (SAFOD) reached a significant goal on Aug. 2 when scientists drilled into a seismically active section of the fault approximately two miles below the surface of the Earth.   view more (2005-08-04)

Scientists offer new model for forecasting the likelihood of an earthquake
In assessing the probability of an earthquake, scientists rely on two important pieces of data that are often inconsistent. The past geological record sometimes tells one story, while current measurements from the Global Positioning System (GPS) tell another. But a new forecasting model designed by Stanford University geophysicists may help close... view more... (2006-12-11)

San Jacinto fault is younger than thought, rises in seismic importance
A detailed study of sedimentary rocks exposed along a portion of southern California's San Jacinto fault zone shows the fault to be no older than 1.1 million to 1.3 million years and that its long-term slip rate is probably faster than previously thought.   view more (2006-10-24)

Forecasting the Next Great San Francisco Earthquake
The San Francisco Bay region has a 25 percent chance of a magnitude 7 or greater earthquake in the next 20 years, and a roughly 1 percent chance of such an earthquake each year, according to the "Virtual California" computer simulation.   view more (2005-10-14)

Geologists recover rocks yielding unprecedented insights into San Andreas Fault
For the first time, geologists have extracted intact rock samples from 2 miles beneath the surface of the San Andreas Fault, the infamous rupture that runs 800 miles along the length of California.   view more (2007-10-05)

San Andreas Fault Observatory at Depth reveals new insights into the 'earthquake machine'
The San Andreas Fault Observatory at Depth (SAFOD)-the first underground observatory to provide physical samples and real-time seismological data from deep inside an active fault zone-is yielding surprising new clues about the origin of earthquakes.   view more (2005-12-06)
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