Stochastic finite-fault modeling of ground motions from the June 27, 1998 Adana-Ceyhan earthquake

Abstract

In 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.

Stochastic Strong Ground Motion Simulation of the 12 November 1999 Duzce (Turkey) Earthquake Using a Dynamic Corner Frequency Approach

“…Finally the ground motion at a receiver from the entire fault is obtained by summing up the contribution from each subfault with a proper time delay. Stochastic finite-fault method has been verified by numerous studies to estimate reliable ground motions of (actual or scenario) earthquakes in various tectonic settings (e.g., Beresnev and Atkinson, 1998b;Atkinson and Beresnev, 2002;Benetatos and Kiratzi, 2004;Roumelioti et al, 2004;Yalcinkaya, 2005;Motazedian and Moinfar, 2006;Shoja-Taheri and Ghofrani, 2007;Castro et al, 2008;Ansal et al, 2009). One limitation of the traditional finite-fault model is the constraint on the number of subfaults and the dependence of the total radiated energy on the subfault size.…”

Seismological and Engineering Demand Misfits for Evaluating Simulated Ground Motion Records

“…The low frequencies, which are solved mostly by deterministic methods, need precise source and velocity models (e.g., [12][13][14][15][16][17][18]). On the other hand, incoherency of the phase angles can be modeled using stochastic approaches (e.g., [19][20][21][22][23][24][25][26][27][28]). In order to model the broadband frequency range, hybrid ground motion simulation techniques are introduced (e.g., [29][30][31][32][33]).…”