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- Title
Orientation of Maximum Spectral Demand in the Near-Fault Region.
- Authors
Huang, Yin-Nan; Whittaker, Andrew S.; Luco, Nicolas
- Abstract
An orientation-dependent parameter, R ¯ Sa (θ) , is used to investigate the orientation of maximum elastic spectral demand for near-fault ground motions. The upper bound on R ¯ Sa (θ) , equal to 1, occurs when the spectral demands for an orientation θ are equal to the maximum demands at all periods considered. One hundred forty-seven pairs of near-fault ground motions were used to identify the orientation associated with the maximum value of R ¯ Sa for each pair of ground motions. The maximum value of R ¯ Sa is greater than 0.9 for over 80% of the records in the dataset, meaning that there is generally an axis where the spectral demands are equal or very close to the maximum spectral demands for a wide range of period. The strike-normal direction should not be used as a surrogate for the direction of maximum shaking for a) closest site-to-source distance less than 5 km and periods less than 1 second , and b) closest site-to-source distance greater than 5 km.
- Publication
Earthquake Spectra, 2009, Vol 25, Issue 3, p707
- ISSN
8755-2930
- Publication type
Article
- DOI
10.1193/1.3158997