Effects of Detail Spatial Variation of Slip Amplitude on the Ground Motions

Abstract eng:
We have investigated the effects of detail spatial variation of slip amplitude on the fault plane on ground motions. We calculated ground motions for three different source models; i) Asperity model with rectangular asperity (Model 1), ii) Asperity model with no assumption for the shape of asperity (Model 2), and iii) Model with detail spatial variation of slip amplitude on the fault plane (Model 3). The calculated waveforms show little differences among these three models. On the other hand, the spectrum amplitudes from model 3 show large differences, i.e., peak value of response spectrum amplitude is large and its width of peak spectrum amplitude is wide compared to those from model 1 and 2. Because all of the models might reproduce the peak frequency of directivity pulses from the asperity, these differences come from the way of modeling of slip amplitude, i.e., whether the detail spatial variation of slip amplitude has been incorporated into modeling source for ground motion calculations or not. So far, because we did not compare the calculated waveforms with the observed data, we could not speculate that which model is preferable for the ground motion prediction. Developing the method for modeling source equivalent to the source model for the previous events with variable slip distribution and incorporating more detail variation of slip on the fault plane into modeling source looks very useful for the ground motion prediction for future event.

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