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NGA-West 2 Equations for predicting PGA, PGV, and 5%-Damped PSA for shallow crustal earthquakes

Earthquake Spectra

By:
, , ,
DOI: 10.1193/070113EQS184M

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Abstract

We provide ground-motion prediction equations for computing medians and standard deviations of average horizontal component intensity measures (IMs) for shallow crustal earthquakes in active tectonic regions. The equations were derived from a global database with M 3.0–7.9 events. We derived equations for the primary M- and distance-dependence of the IMs after fixing the VS30-based nonlinear site term from a parallel NGA-West 2 study. We then evaluated additional effects using mixed effects residuals analysis, which revealed no trends with source depth over the M range of interest, indistinct Class 1 and 2 event IMs, and basin depth effects that increase and decrease long-period IMs for depths larger and smaller, respectively, than means from regional VS30-depth relations. Our aleatory variability model captures decreasing between-event variability with M, as well as within-event variability that increases or decreases with M depending on period, increases with distance, and decreases for soft sites.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
NGA-West 2 Equations for predicting PGA, PGV, and 5%-Damped PSA for shallow crustal earthquakes
Series title:
Earthquake Spectra
DOI:
10.1193/070113EQS184M
Volume
30
Issue:
3
Year Published:
2013
Language:
English
Publisher:
Earthquake Engineering Research Institute
Publisher location:
Berkeley, CA
Contributing office(s):
Earthquake Science Center
Description:
29 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1057
Last page:
1085
Number of Pages:
29