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Hybrid stochastic finite fault modeling of 2003, M6.5, Bam earthquake (Iran)

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Abstract

Accelerographic time series of the M ∗6.5 Bam (Iran) earthquake of December 26, 2003, are used to calibrate the source and propagation path characteristics based on a hybrid stochastic approach, which includes stochastic finite fault and analytical modeling. Estimation of source characteristics is based on the calibration of finite-fault modeling to near-source observed time series, while propagation characteristics are estimated using far-field recorded ones. The distance-dependent Kappa factor is obtained from the slope of smoothed amplitude of acceleration Fourier spectrum at higher frequencies. The estimated zero-distance Kappa value is 0.06. Calibration based on near-source time series indicates a stress drop of 130 bars for the Bam earthquake. The strong impulsive long-period motion, recorded at the only near-source station, is modeled using analytical modeling of Mavroeidis and Papageorgiou (2003).

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Authors and Affiliations

  1. Department of Earth Science, Carleton University, Ottawa, Ontario, K1S5B6, Canada

    Dariush Motazedian & Aliakbar Moinfar

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  1. Dariush Motazedian
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  2. Aliakbar Moinfar
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Correspondence to Dariush Motazedian.

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Motazedian, D., Moinfar, A. Hybrid stochastic finite fault modeling of 2003, M6.5, Bam earthquake (Iran). J Seismol 10, 91–103 (2006). https://doi.org/10.1007/s10950-005-9003-x

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