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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3192

Authors: Castro, R. R.*
Pacor, F.*
Franceschina, G.*
Bindi, D.*
Zonno, G.*
Luzi, L.*
Title: Stochastic strong-motion simulation of the umbria- marche earthquake of september 1997 (mw 6):comparison of different approaches
Issue Date: 2007
Keywords: strong-motion simulation
Abstract: We simulated strong motion records from the Umbria-Marche, Central Italy earthquake (Mw 6) of September 1997 using a frequency-dependent S-wave radiation function. We compared the observed acceleration spectra, from strong-motion instruments located in the near field and at regional distances, with those simulated using the stochastic modeling technique of Beresnev and Atkinson (1997, 1998), and modified to account for a frequency dependent radiation pattern correction. By using the frequency-dependent radiation function previously obtained by Castro et al. (2006) we reduced the overall fitting error of the acceleration spectra by about 9%. In general, we observed that the frequency-dependent radiation pattern correction has a small effect on the spectral amplitudes compared with site effects, which is an important factor controlling the strong-motion records generated by the 1997 Umbria-Marche earthquake. In addition, we modeled the observed ground-motion records using the dynamic corner frequency model of Motazedian and Atkinson (2005) to reproduce the directivity effects, reducing the average error of the spectral amplitudes by 24%. We concluded that although the frequency-dependent radiation pattern correction affects the frequency content of the spectral amplitudes simulated, site and directivity effects are more relevant.
Appears in Collections:Manuscripts
04.06.04. Ground motion

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