Ground-Motion Simulation for Guiding Ground-Motion Prediction Equation Input Parameters Setting and Evaluation in PSHA

Y. T. Yen ； M. C. Hsieh ； P. S. Lin ； S. Y. Chi

《Geotechnical Hazard Mitigations: Experiment, Theory and Practice—Proceedings of the 5th International Conference on Geotechnical Engineering for Disaster Mitigation and Rehabilitation》 2017年 (2017/10) Pp. 281-292

https://doi.org/10.6140/9789864371419.201710.0024

摘要

Ground-motion prediction equation (GMPE), which is an efficient way in predicting earthquake-induced ground motions by giving simple input parameters of source geometry, attenuation of wave propagation and specific site condition, is a key component and widely implemented in probabilistic seismic hazard analysis (PSHA) process. However, for the complex fault rupture cases like listric fault and insufficient information like the site is located at the subduction-zone edge, ground motion prediction by GMPE faces difficulties to set input parameters for implementing to seismic hazard analysis due to the simplification of input parameters. Fortunately, by introducing ground-motion-simulation techniques, complex source geometry and wave propagation in media can be physically modeled. Furthermore, overall characteristics of ground motion at a specific site of interest can also be delineated throughout multiple earthquake-scenario cases. In this study, we firstly present the application of groundmotion simulation to evaluate and adjust GMPE input parameters for the listric-fault case. Therefore, quantitatively comparing the resulting ground motions from GMPE prediction and simulated data is feasible for guiding the setting of input parameters for GMPEs. In addition to the evaluations of ground motion characterization of the listric-fault cases, retrieving the scaling relationship between along-rupture and off-end sites with respect to subduction-source fault geometry is also a rigorous issue for the use of subduction-zone type GMPEs in seismic hazard analysis. Our results show that simulated response spectra of the along-rupture sites reveal higher ground motions with respect to off-end sites in the subduction-zone case. A maximum reduction of ~ 14% and a mean reduction of ~10% can be found on the sites which are located off the end of the subduction zone.

關鍵字

Ground motion simulation ； Listric fault ； Subduction zone ； GMPE ； PSHA