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Empirical estimation of high-frequency ground motion on hard rock

Empirical estimation of high-frequency ground motion on hard rock

Ktenidou, Olga-Joan and Abrahamson, Norman A. (2016) Empirical estimation of high-frequency ground motion on hard rock. Seismological Research Letters, 87 (6). ISSN 0895-0695 (Print), 1938-2057 (Online) (doi:10.1785/0220160075)

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Abstract

Site effects for hard-rock sites are typically computed using analytical models for the effect of κ0, the high-frequency attenuation parameter. New datasets that are richer in hard-rock recordings allow us to evaluate the scaling for hard-rock sites (e.g., VS30 > 1500 m=s). The high-frequency response spectra residuals are weakly correlated with κ0, in contrast to the strong scaling with κ0 in the analytical models. This may be due to site-specific shallow resonance patterns masking part of the effect of attenuation due to damping. An empirical model is developed for the combined VS30 and κ0 scaling for hard-rock sites relative to a reference site condition of 760 m=s (i.e., correction factors that should be used for going from soft rock to hard rock, taking into account the net effect of VS and κ0). This empirical model shows high-frequency amplification that is more similar to the analytical prediction corresponding to a hard-rock κ0 of 0.020 s rather than the typical value of 0.006 s, which is commonly used for hard-rock sites in the central–eastern United States. Compared to the current analytical approach, this leads to a reduction of high-frequency (>20 Hz) scaling of about a factor of 2.

Item Type: Article
Additional Information: © 2016 by the Seismological Society of America
Uncontrolled Keywords: kappa; amplification; attenuation
Subjects: Q Science > QE Geology
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Department of Engineering Science
Last Modified: 15 Mar 2018 13:47
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: GREAT d
URI: http://gala.gre.ac.uk/id/eprint/15889

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