Inclusion of Scattering Impulse Response Functions To Compute Ground Motion


Abstract eng:
After response spectra, ground motion duration is an important engineering parameter that can greatly affect structural damage. Any synthetic ground motion model should capture observed metrics from past earthquakes such as response spectra and ground motion duration. Duration of ground motion is in part influenced by the magnitude of the earthquake, but primarily by the physical process of multiple scattering of body waves in the crust of the earth. At high frequencies (>1Hz), ground motion is stochastic in nature as well as non-stationary in both time and frequency. The multiple lapse time window method can estimate frequency dependent scattering loss and intrinsic absorption parameters for particular regions. In the work of [1], they estimated scattering impulse response functions (SIRF’s) by inverting the parameters of coda envelopes at different frequency bands using the multiple lapse time window method. With these SIRF’s, we generate synthetic scatterograms and convolve them with deterministic Green’s functions to produce scattering Green’s functions (SGF’s). We used the UCSB method [2, 3] to simulate 50 stochastic realizations of kinematic rupture on a finite fault with the same location, magnitude and dimensions of the assumed earthquakes. We then compute ground acceleration with the SGF's for all 50 kinematic rupture scenarios. We compute spectral acceleration and ground motion duration based on the evolutionary Arias intensity for each synthetic seismogram and compare these simulations to the actual recorded ground motion for these events. The bias of duration is quite small and shows no trend with distance away from each assumed fault.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 4331.:
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