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Estimation of kappa (sub 0) implied by the high-frequency shape of the NGA-West2 ground-motion prediction equations

Arash Zandieh, Kenneth W. Campbell and Shahram Pezeshk
Estimation of kappa (sub 0) implied by the high-frequency shape of the NGA-West2 ground-motion prediction equations
Bulletin of the Seismological Society of America (June 2016) 106 (3): 1342-1356

Abstract

The spectral-decay parameter kappa (sub 0) is often used to account for the reduction of the high-frequency amplitude of ground motion caused by attenuation within the site profile. In this study, we used the inverse random vibration theory approach described by Al Atik et al. (2014) to calculate Fourier amplitude spectra from predicted values of response-spectral acceleration for all five Next Generation Attenuation (NGA)-West2 ground-motion prediction equations (GMPEs). We used these spectra to estimate kappa (sub 0) using the spectral-decay method. Each GMPE was evaluated for a National Earthquake Hazard Reduction Program B/C site condition and for default estimates of depth to the top of rupture, hypocentral depth, and sediment (basin) depth. We derived estimates of kappa (sub 0) for magnitudes ranging from 3.5 to 8.0 and distances ranging from 5 to 20 km and used a mixed-effects model to derive equations for these estimates as a function of magnitude. We also calculated kappa (sub 0) from the geometric mean of the response-spectral accelerations of the GMPEs to check the sensitivity of the results to the two approaches and found that the values of kappa (sub 0) derived in this study using a mixed-effects model are in good agreement with these estimates. The values of kappa (sub 0) obtained in this study do not necessarily represent the physical high-frequency damping within the site profiles used to develop the NGA-West2 GMPEs. Instead, they are intended to represent the high-frequency shape of the median predicted spectral accelerations from the GMPEs. The kappa (sub 0) model developed in this study can be used in inversions to develop stochastic models that are intended to mimic the predictions from the NGA-West2 GMPEs. Online Material: Tables of random effects result on coefficients kappa (sub 0) , and figures of Fourier amplitude spectrum.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 106
Serial Issue: 3
Title: Estimation of kappa (sub 0) implied by the high-frequency shape of the NGA-West2 ground-motion prediction equations
Affiliation: Lettis Consultants International, Boulder, CO, United States
Pages: 1342-1356
Published: 201606
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 42
Accession Number: 2016-083628
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N32°30'00" - N42°00'00", W124°30'00" - W114°15'00"
Secondary Affiliation: CoreLogic, USA, United StatesUniversity of Memphis, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201640
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