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Losses to single-family housing from ground motions in the 1994 Northridge, California, earthquake

Earthquake Spectra

By:
, , , ,
DOI: 10.1193/1.1775238

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Abstract

The distributions of insured losses to single-family housing following the 1994 Northridge, California, earthquake for 234 ZIP codes can be satisfactorily modeled with gamma distributions. Regressions of the parameters in the gamma distribution on estimates of ground motion, derived from ShakeMap estimates or from interpolated observations, provide a basis for developing curves of conditional probability of loss given a ground motion. Comparison of the resulting estimates of aggregate loss with the actual aggregate loss gives satisfactory agreement for several different ground-motion parameters. Estimates of loss based on a deterministic spatial model of the earthquake ground motion, using standard attenuation relationships and NEHRP soil factors, give satisfactory results for some ground-motion parameters if the input ground motions are increased about one and one-half standard deviations above the median, reflecting the fact that the ground motions for the Northridge earthquake tended to be higher than the median ground motion for other earthquakes with similar magnitude. The results give promise for making estimates of insured losses to a similar building stock under future earthquake loading. ?? 2004, Earthquake Engineering Research Institute.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Losses to single-family housing from ground motions in the 1994 Northridge, California, earthquake
Series title:
Earthquake Spectra
DOI:
10.1193/1.1775238
Volume
20
Issue:
3
Year Published:
2004
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1021
Last page:
1045
Number of Pages:
25