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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
Subject Classification04. Solid Earth::04.06. Seismology::04.06.04. Ground motion 
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.
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