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Project Number 222
Date of Summary March 31, 1995
Subject Probabilistic Seismic Hazard Analysis for Offshore Platforms in the Santa Barbara Channel
Performing Activity Lawrence Livermore National Laboratory
Principal Investigator Mr. Robert C. Murray
Contracting Agency Minerals Management Service
Estimated Completion Completed.
Description A probabilistic seismic hazard analysis (PSHA) will be conducted to assess the levels of vibratory ground motions expected during various time periods. The results will be used to update current seismic hazard maps that have been used in the Santa Barbara Channel area since the 1960's, in the review of seismic design criteria and seismic performance of offshore structures. This is a 2 year, 3 phase project. The first phase of the study will collect data from the USGS, MMS, relevant experts, and oil companies to identify all available seismic design criteria for offshore platforms. Data collection will focus on data collected in the last few years including proprietary data from industry. Phase 2 will be a 2 day workshop on the state of the art of seismic hazard criteria for offshore platforms on the west coast continental shelf. Phase 3 will be a PSHA analysis of the Phase 1 and 2 studies and a review by a peer review panel. The effort will be conducted as a joint project with the California State Lands Commission.
Progress Two basic models were developed: thick skinned (Model 1) and thin skinned (Model 2). Each model was characterized based on four factors

1) geometries;

2) probability distribution for fault slip rates;

3) probability distribution of characteristic moment magnitudes (Mw); and

4) earthquake recurrence rate distributions.

Reports
AA Foxall, William, Auguste Boissonnade, Lawrence Hutchings and Jean Savy, Technical Issues Relevant to Seismic Hazard of the Eastern Santa Barbara Channel, Lawrence Livermore National Laboratory, Livermore, California, April 1995. (Out of Print)
AB Foxall, William and Jean Savy, Probabilistic Seismic Hazard Analysis for Offshore Structures in the Santa Barbara Channel, Phase 2 Report, Lawrence Livermore National Laboratory, Livermore, California, December 1996. (Out of Print)

 

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