Comparison of the Dynamic and Static Corner Frequencies in Ground Motion Simulation: Cases Study of Jiuzhaigou Earthquake and Northridge Earthquake

Abstract

By using the stochastic finite-fault method based on static corner frequency (Model 1) and dynamic corner frequency (Model 2), we calculate the far-field received energy (FRE) and acceleration response spectra (SA) and then compare it with the observed SA. The results show that FRE obtained by the two models depends on the subfault size regardless of high-frequency scaling factor (HSF). Considering the HSF, the results obtained by Model 1 and Model 2 are found to be consistent. Then, similar conclusion was obtained from the Northridge earthquake. Finally, we analyzed the reasons and proposed the areas that need to be improved.

Ground Motion Simulations for the 19 January 2020 Jiashi, China, Earthquake Using Stochastic Finite‐Fault Approach

“…From the perspective of the nonuniformity of earthquake ruptures and their randomness during propagation, in most earthquake engineering programs, the stochastic finite‐fault approach based on dynamic corner frequency (EXSIM) has routinely been adopted to simulate near‐field medium‐strong ground motion. Currently, the EXSIM has been proven to be the most effective technique for the simulation of high‐frequency ground motion and is widely applied by many scholars globally (Dang, Cui, & Liu, 2022; Dang, Cui, Liu, & Xia, 2022; Dang, Liu, & Ji, 2022; Dang et al., 2021; J. Z.…”