NGA-West 2 Equations for predicting PGA, PGV, and 5%-Damped PSA for shallow crustal earthquakes
Earthquake Spectra
By: David M. Boore, Jon P. Stewart, Emel Seyhan, and Gail M. Atkinson
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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.
Suggested Citation
Boore, D.M., Stewart, J.P., Seyhan, E., Atkinson, G.M., 2013, NGA-West 2 Equations for predicting PGA, PGV, and 5%-Damped PSA for shallow crustal earthquakes: Earthquake Spectra, v. 30, no. 3, p. 1057-1085, https://doi.org/10.1193/070113EQS184M.
| 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 |
| Publication Date | August 01, 2014 |
| 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 |
| Larger Work Title | Earthquake Spectra |
| First page | 1057 |
| Last page | 1085 |