Abstract
Effects of a basin structure on long period ground motion generation in Eskişehir region are studied by investigating the observed features of the 2011 Simav Earthquake (Mw:5.9) accelerograms. Spectral values and significant duration of ground motion at the basin center is much higher than the predicted mean values obtained by empirical models. 3-D wave propagation simulation of a small magnitude local event is accomplished utilizing a finite difference method and experimental velocity models. Simulation results indicate that the basin model produces more realistic waveforms than the flat layered model. Synthetic velocities agree with observed ones at two basin-center stations but considerable discrepancies exit at basin edge stations. These findings suggest that more careful definitions of basin boundaries are necessary for future models.
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