Abstract
AbstractIn this study, acceleration time histories of the June 27, 1998 Adana-Ceyhan (Turkey) earthquake, are simulated using a stochastic modeling technique for finite faults proposed by Beresnev and Atkinson (1997). The fault length, width and the depth to the top of the fault for the earthquake are assumed 30 km, 21 km and 15 km, respectively, based on the aftershock distribution. Simulations are made for two common site classes: soil and rock. Their response characteristics are obtained from the site-specific amplification functions estimated for the weak motion seismograms at stations located in the region using spectral ratio methods. The results show that the overall agreement between simulated and observed waveforms and spectra is quite satisfying. However, significant discrepancies exist at certain stations, implying that site amplification functions play an important role in the simulation process. The effects of nonlinearity and basin edge generated surface waves do not clearly dominate on the results. The peak horizontal acceleration contours estimated using the calibrated model are consistent with the observed intensity values and the other evidences of strong ground motions.
Highlights
The prediction of earthquake ground motions for large earthquakes is a crucial problem in engineering seismology
The misfits may arise from the inadequate representation of the local site amplifications by the mean amplification functions, because the used source model works well at other stations
The mean amplification functions estimated for rock and soil sites using the spectral ratio methods to account for the local site response were used
Summary
The prediction of earthquake ground motions for large earthquakes is a crucial problem in engineering seismology. Hanks and McGuire, 1981; Boore, 1983, 1996; Boore and Atkinson, 1987; Atkinson and Boore, 1997; Toro et al, 1997) In this method, high-frequency earthquake motions are represented as band-limited Gaussian noise having a ω2 mean spectrum. In the most commonly employed approach, earthquakes are treated as point sources, not taking into account the finite-fault effects such as rupture geometry and directivity. To accommodate these effects, several authors have recently extended the stochastic modeling technique to consider rupture along a finite-fault plane Several authors have recently extended the stochastic modeling technique to consider rupture along a finite-fault plane (e.g. Beresnev and Atkinson, 1997; Kamae and Irikura, 1992)
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