An updated stochastic finite fault modeling: Application to the Mw 6.0 earthquake in Jiashi, China

Abstract

On January 19, 2020 at 21:27 local time, the Jiashi County in China witnessed an Mw 6.0 earthquake. The earthquake event was recorded by 42 strong ground-motion observation stations and recorded a total of 126 sets of acceleration time history records. In this study, we simulated the Jiashi earthquake based on the updated finite-fault modeling. The zero-distance high-frequency attenuation parameter κ0 and local site amplification factor were calculated based on the recordings, and the other input parameters were obtained from the previous studies. Then the Fourier amplitude spectrum, 5%-damped pseudo-acceleration response spectrum, peak ground acceleration, and accelerograms at 12 selected stations were synthetized using an updated finite-fault modeling. The results indicated that the synthetic results had no evident differences at most of the selected stations, which showed that the updated approach can be adopted to predict the ground motion. In addition, the simulated accelerograms are similar to the observed records at most stations, which indicated that the updated modeling can be used to generate the seismic input records required for structural analysis. In the future research, we should more analyze the interconnection between each input parameter and establish the relationship between parameters. If so, even though we cannot obtain the detailed information of several parameters, we can still accurately estimate the seismic field of imminent earthquakes in the future, which will help to establish the disaster maps of the target region.