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A modified ground-motion attenuation relationship for southern California that accounts for detailed site classification and a basin-depth effect

Bulletin of the Seismological Society of America

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Abstract

The attenuation relationship presented by Boore et al. (1997) has been evaluated and customized with respect to southern California strong-motion data (for peak ground acceleration (PGA) and 0.3-, 1.0-, and 3.0-sec period spectral acceleration). This study was motivated by the recent availability of a new site-classification map by Wills et al. (2000), which distinguishes seven different site categories for California based on the 1994 NEHRP classification. With few exceptions, each of the five site types represented in the southern California strong-motion database exhibit distinct amplification factors, supporting use of the Wills et al. (2000) map for microzonation purposes. Following other studies, a basin-depth term was also found to be significant and therefore added to the relationship. Sites near the center of the LA Basin exhibit shaking levels up to a factor of 2 greater, on average, than otherwise equivalent sites near the edge. Relative to Boore et al. (1997), the other primary difference here is that PGA exhibits less variation among the Wills et al. (2000) site types. In fact, the PGA amplification implied by the basin-depth effect is greater than that implied by site classification. The model does not explicitly account for nonlinear sediment effects, which, if important, will most likely influence rock-site PGA predictions the most. Evidence for a magnitude-dependent variability, or prediction uncertainty, is also found and included as an option.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A modified ground-motion attenuation relationship for southern California that accounts for detailed site classification and a basin-depth effect
Series title:
Bulletin of the Seismological Society of America
Volume
90
Issue:
6 SUPPL.
Year Published:
2000
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article