Directivity in NGA earthquake ground motions: Analysis using isochrone theory
Earthquake Spectra
By: P. Spudich and B.S.J. Chiou
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Abstract
We present correction factors that may be applied to the ground motion prediction relations of Abrahamson and Silva, Boore and Atkinson, Campbell and Bozorgnia, and Chiou and Youngs (all in this volume) to model the azimuthally varying distribution of the GMRotI50 component of ground motion (commonly called 'directivity') around earthquakes. Our correction factors may be used for planar or nonplanar faults having any dip or slip rake (faulting mechanism). Our correction factors predict directivity-induced variations of spectral acceleration that are roughly half of the strike-slip variations predicted by Somerville et al. (1997), and use of our factors reduces record-to-record sigma by about 2-20% at 5 sec or greater period. ?? 2008, Earthquake Engineering Research Institute.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Directivity in NGA earthquake ground motions: Analysis using isochrone theory |
| Series title | Earthquake Spectra |
| DOI | 10.1193/1.2928225 |
| Volume | 24 |
| Issue | 1 |
| Year Published | 2008 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Earthquake Spectra |
| First page | 279 |
| Last page | 298 |
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