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Future Seismic Hazards in Southern California - Phase I: Implications of the 1992 Landers Earthquake Sequence

Agnew, Duncan C. and Aki, Keiiti and Cornell, C. Allin and Davis, James F. and Flores, Paul and Heaton, Thomas H. and Idriss, I. M. and Jackson, David D. and McNally, Karen C. and Reichle, Michael S. and Savage, James C. and Sieh, Kerry E. (1992) Future Seismic Hazards in Southern California - Phase I: Implications of the 1992 Landers Earthquake Sequence. California Division of Mines and Geology , Sacramento, CA.

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Southern California and its seismologists received a wake-up call on June 28, 1992. The largest earthquake to strike southern California in 40 years occurred near the town of Landers, located 30 km north of the San Andreas fault. It had a magnitude of 7.5 (M7.5). Three and one-half hours later, a M6.5 aftershock struck the Big Bear area 40 km (kilometers) to the west of Landers. An ad hoc working group was rapidly convened in July, 1992, to evaluate how the Landers-Big Bear earthquake sequence might affect future large earthquakes along major faults in southern California. In particular, what are the chances of large earthquakes in the next few years and how do they compare to previous estimates (such as those of the Working Group on California Earthquake Probabilities -- WGCEP, 1988)? Such an evaluation was made for central California after the Lorna Prieta earthquake of 1989 (WGCEP, 1990). The charge to the Landers ad hoc working group included analyzing the seismicity for the last several years in southern California and the new paleoseismic, geologic, and geodetic data recently available for southern California. To inform the public about the potential hazard of plausible earthquakes, the working group was also asked to map the predicted severity of ground shaking for such earthquakes compared to that from the Landers earthquake.

Item Type:Report or Paper (Report)
Heaton, Thomas H.0000-0003-3363-2197
Sieh, Kerry E.0000-0002-7311-2447
Additional Information:© 1992 California Division of Mines and Geology.
Record Number:CaltechAUTHORS:20150227-093005080
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55328
Deposited By: Tony Diaz
Deposited On:04 Mar 2015 00:02
Last Modified:03 Oct 2019 08:04

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