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Stochastic Strong-Motion Simulation of the M_w 6 Umbria–Marche Earthquake of September 1997: Comparison of Different Approaches

Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), División Ciencias de la Tierra Departamento de Sismología, Km 107 carretera Tijuana-Ensenada, 22860 Ensenada, Baja California, México raul{at}cicese.mx

F. Pacor, G. Franceschina, D. Bindi, G. Zonno, and L. Luzi

Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Milano, Via Bassini 15, 20133 Milano, Italia pacor{at}mi.ingv.it

We simulated strong-motion records from the Umbria–Marche, central Italy, earthquake (M_w 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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