Calendar For April 2005

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USGS research in the Bay system began in the 1960s with a search for underwater earthquake faults In the 1970s, the research team expanded to cover studies of water properties and quality, water mixing and flow, and estuarine ecology Early scientifc findings clashed with assumptions behind massive and unbridled modifcations of the Bay system and served to stimulate much public debate The USGS Bay research program and its scientists became renowned-- they have set the standards for the study of estuaries Thirty-five years of scientifc data and publications form a unique resource for decisions by legislators, planners, and coastalzone managers Flyer: jan05flyer.pdf (Adobe Acrobat PDF) February 24, 2005

The Parkfield earthquake of 1966 launched a torrent of research at the USGS in Menlo Park. With the San Andreas Fault as a backyard lab and global earthquakes as a guide, the USGS has changed the landscape of earthquake science in: MAKING RAPID EARTHQUAKE ASSESSMENTS PROMOTING PUBLIC SEISMIC SAFETY DISCOVERING NEW AND HIDDEN FAULTS MEASURING FAULT STRESS AND STRAIN IMPROVING SEISMIC ENGINEERING UNDERSTANDING GROUND SHAKING FORECASTING FUTURE EARTHQUAKES Flyer: apr05flyer.pdf (Adobe Acrobat PDF)

Experience a virtual tour of the San Andreas Fault with classic 1950s 3-D* images Discover some basic facts and features of California geology Learn of public places to explore the San Andreas Fault in the Bay Area- and beyond Grasp how 3-D* images can markedly enhance remote interpretation of landscapes Flyer: jul05flyer.pdf (Adobe Acrobat PDF) August 25, 2005

The international bestselling author of The Professor and the Madman and Kra katoa vividly brings to life the 1906 San Francisco Earthquake that leveled a city symbolic of Americas relentless western expansion. Simon Winchester has also fashion ed an enthralling and informative look at the tumultuous subterranean world that produces earthquakes, the planets most sudden and destructive force. In the early morning hours of April 18, 1906, San Francisco and a string of towns to i ts north-northwest and the south-southeast were overcome by an enormous shaking that was compounded by the violent shocks of an earthquake, registering 8.25 on th e Richter scale. The quake resulted from a rupture in a part of the San Andreas fault, which lies underneath the earths surface along the northern coast of Calif ornia. Lasting little more than a minute, the earthquake wrecked 490 blocks, toppled a total of 25,000 buildings, broke open gas mains, cut off electric power lines th roughout the Bay area, and effectively destroyed the gold rush capital that had stood there for a half century.^M Simon Winchester brings his inimitable storytelling abilities -- as well as his unique understanding of geology -- to this extraordinary event, exploring not only what happened in northern California in 1906 but what we have learned since about the geologica l underpinnings that caused the earthquake in the first place. But his achievement is even greater: he positions the quakes significance along the earths geolo gical timeline and shows the effect it had on the rest of twentieth-century California and American history. A Crack in the Edge of the World is the definitive account of the San Francisco earthquake. It is also a fascinating exploration of a legendary event that changed the way we look at the planet on which we live. October 27, 2005

How did the 1992 Landers quake in the remote Mojave Desert change scientists thinking about earthquake sequences? What is the explanation for "aftershocks" of the 1906 San Francisco earthquake reported in Arizona? How do large quakes shake up distant faults and volcanic areas ? Are new theories of earthquake interactions making the conventional terminology-- foreshock, mainshock, aftershock--inadequate? Do large earthquakes have a long reach on human cultures as well? Flyer: oct05flyer.pdf (Adobe Acrobat PDF) November 17, 2005

San Francisco Bay is one of the worlds finest natural harbors and a major center of maritime trade All ships visiting bay ports are funneled through the central bay Bedrock knobs that rise from the central bay floor have been repeatedly blasted to accommodate vessels of increasingly deeper draft Sediment dredged from harbors and shipping channels has been disposed of on the bay floor Since the early 1900s, the bay floor has been mined for sand and gravel New tools are allowing scientists to create detailed views of the bay floor, revealing changes that man has made since the Gold Rush

Scientifically invaluable ice cores taken from Antarctic and Arctic ice are stored and safe guarded at the U.S. National Ice Core Laboratory, operated by the U.S.