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Directivity in NGA earthquake ground motions: Analysis using isochrone theory

Earthquake Spectra

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DOI: 10.1193/1.2928225

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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.

Additional Publication Details

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
First page:
279
Last page:
298