Stochastic Finite-Fault Method Based on Dynamic Corner Frequency to Simulate the Mw6.2 Tottori earthquake in Japan

Abstract

Stochastic finite-fault method is the main method to simulate near field strong earthquakes in current seismic engineering. For specific ground motion, the accuracy of parameter selection is important, such as field effect, because the number of rock sites is scarce in many areas of China, the calculation of crustal amplification and site amplification of a specific soft soil site can not only eliminate the limitation of station selection, but also improve the accuracy of simulation results. In this paper, a stochastic finite-fault method based on dynamic corner frequency is used to simulate the Mw6.2 Tottori earthquake on October 21, 2016 in Japan. The comparison with the actual records shows that the simulation results are in good agreement with the short period and have great feasibility. This paper discusses the differences between the simulated response spectra (PSA) of stations with various azimuths and the observed one. Meanwhile, it also demonstrates the dissimilarities in simulation results between the stations located on the hanging wall and those located on the flat wall of the fault plane. The results show that for soft soil sites, crustal amplification and site amplification, as well as the geometrical position relationship between stations and faults have a certain impact on the simulation results. Based on the calculation of specific crustal amplification and site amplification in a specific region, the location relationship between stations and faults is included in the analysis, so that the future earthquake can be predicted more accurately, and an important reference can be provided for the disaster assessment in this region and the site selection of major projects.