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Site-specific seismic-hazard analysis that is completely probabilistic

Bulletin of the Seismological Society of America

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Abstract

When a site-specific probabilistic ground-motion estimate is required, the full site-amplification distribution should be used instead of a single deterministic median value. A probabilistic methodology using site-amplification distributions to modify rock ground-motion attenuation relations into site-specific relations prior to calculating seismic hazard has been developed and applied at two selected sites in the central United States: Memphis, Tennessee, and Paducah, Kentucky. The use of a completely probabilistic approach can make about a 10% difference in ground-motion estimates over simply multiplying a bedrock probabilistic ground motion by a median site-amplification factor at a 1 in 2475 annual probability of exceedance and even larger differences at smaller probabilites of exceedance. The value of this approach is that a probabilistic answer incorporating the uncertainty in our knowledge of site amplification of ground motions can be calculated.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Site-specific seismic-hazard analysis that is completely probabilistic
Series title:
Bulletin of the Seismological Society of America
Volume
93
Issue:
4
Year Published:
2003
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1841
Last page:
1846
Number of Pages:
6