Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


Scripps-Led Study Sheds Light on Earthquake Hazard Along San Andreas Fault

Researchers discovered new faults that reveal how tectonic strain is transferred below Southern California's Salton Sea

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.

The team discovered a series of prominent faults beneath the sea, which transfer motion away from the San Andreas Fault as it disappears beneath the Salton Sea. The study provides new understanding of the intricate earthquake faults system beneath the sea and what role it may play in the earthquake cycle along the southern San Andreas Fault.

A seismic map of the Salton Sea area reveals the grid covered by the CHIRP instrument (green lines), faults (black lines) and bomb target sites (gray boxes). The red dots represent earthquakes that have taken place in the area since 1983.

"The stretch of the San Andreas Fault that extends into the Salton Sea is an important part of the overall fault system but it remains poorly understood," said Danny Brothers, a Scripps graduate student and lead author on the study. "Our results provide crucial information on how deformation is transferred from the San Andreas Fault to the Imperial Fault and how young basins along strike-slip faults, such as the Salton Sea, evolve through time."

In a study published in the July 26 early online edition of the journal Nature Geoscience, the Scripps-led research team including Brothers, Neal Driscoll, Graham Kent, Alistair Harding, Jeff Babcock and Rob Baskin, from the USGS, used geophysical methods to image the faults beneath the Salton Sea. This study offers new information on the location of faults and how they communicate tectonic deformation with neighboring faults located onshore.

Scripps researchers deploy the CHIRP image profiler.
The Salton Sea is flanked by two major faults - the San Andreas and San Jacinto - and recent studies have revealed that the region has experienced magnitude-7 earthquakes roughly every 200 years for the last thousand years. Previous studies conducted by researchers at San Diego State University and Cal Tech indicate that it has been approximately 300 years since the last rupture.

"We discovered a series of prominent faults near Bombay Beach during pilot studies in 2006 and 2007, and went on to survey the area more comprehensively in 2008 and 2009," researchers stated in the journal's "backstory" commentary section. The highlight of the expedition was when the team discovered the first previously unknown fault in the Salton Sea, just miles offshore from Bombay Beach, Calif.

Scripps graduate student Danny Brothers

The research team used a high-resolution seismic imaging technique, known as CHIRP, to image the layers of sediments beneath the lake that have been offset by the motion of faults. Scripps' Neal Driscoll developed the digital CHIRP profiler to provide high-quality imagery of the sediments below oceans and lakes to offer a comprehensive view of underwater faults.

Funding for the research study was provided by the California Department of Water Resources, California Department of Fish and Game, UC San Diego Academic Senate, Scripps Institution of Oceanography at UC San Diego, National Science Foundation and Southern California Earthquake Center.

Note to broadcast and cable producers: University of California, San Diego provides an on-campus satellite uplink facility for live or pre-recorded television interviews. Please phone or e-mail the media contact listed above to arrange an interview.

Scripps Institution of Oceanography, at University of California, San Diego, is one of the oldest, largest and most important centers for global science research and education in the world. The National Research Council has ranked Scripps first in faculty quality among oceanography programs nationwide. Now in its second century of discovery, the scientific scope of the institution has grown to include biological, physical, chemical, geological, geophysical and atmospheric studies of the earth as a system. Hundreds of research programs covering a wide range of scientific areas are under way today in 65 countries. The institution has a staff of about 1,300, and annual expenditures of approximately $155 million from federal, state and private sources. Scripps operates one of the largest U.S. academic fleets with four oceanographic research ships and one research platform for worldwide exploration.

Annie Reisewitz | EurekAlert!
Further information:

More articles from Earth Sciences:

nachricht UCI and NASA document accelerated glacier melting in West Antarctica
26.10.2016 | University of California - Irvine

nachricht Ice shelf vibrations cause unusual waves in Antarctic atmosphere
25.10.2016 | American Geophysical Union

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Etching Microstructures with Lasers

Ultrafast lasers have introduced new possibilities in engraving ultrafine structures, and scientists are now also investigating how to use them to etch microstructures into thin glass. There are possible applications in analytics (lab on a chip) and especially in electronics and the consumer sector, where great interest has been shown.

This new method was born of a surprising phenomenon: irradiating glass in a particular way with an ultrafast laser has the effect of making the glass up to a...

Im Focus: Light-driven atomic rotations excite magnetic waves

Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion

Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...

Im Focus: New 3-D wiring technique brings scalable quantum computers closer to reality

Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.

"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...

Im Focus: Scientists develop a semiconductor nanocomposite material that moves in response to light

In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.

A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...

Im Focus: Diamonds aren't forever: Sandia, Harvard team create first quantum computer bridge

By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.

"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...

All Focus news of the innovation-report >>>



Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

Agricultural Trade Developments and Potentials in Central Asia and the South Caucasus

14.10.2016 | Event News

World Health Summit – Day Three: A Call to Action

12.10.2016 | Event News

Latest News

How nanoscience will improve our health and lives in the coming years

27.10.2016 | Materials Sciences

OU-led team discovers rare, newborn tri-star system using ALMA

27.10.2016 | Physics and Astronomy

'Neighbor maps' reveal the genome's 3-D shape

27.10.2016 | Life Sciences

More VideoLinks >>>