Abstract
In this study, the strong ground motion of the Jiuzhaigou Ms7.0 earthquake, which occurred in northern Sichuan, China, was simulated based on the stochastic finite-fault method. The earthquake event was recorded by 66 strong ground-motion stations operated by the China Strong Motion Networks Center. We simulated 11 records selected within 200 km source-to-site distance. According to previous studies and empirical relationships, we estimated the region-specific input parameters. The zero-distance kappa filter obtained had a value of 0.0206 s. Two different source models were applied in this study: the random slip model and specified slip model. Using the stochastic finite-fault method, we simulated the PGA, Fourier spectrum and response spectrum at all stations. The stochastic simulated result based on the specified slip distribution models had no significant bias at most stations. Using a model with a random slip distribution, the simulated response spectra also matched the observed result, which indicated that the stochastic finite-fault method is not very sensitive to the input slip distributions and fault dimensions. We divided the study area into 1116 sites to simulate the spatial distribution of PGA based on the two models. The simulated maximum intensity of the epicentral area reached level IX, which was similar to the observed maximum intensity and indicated that the simulated result could be used in prediction of an imminent earthquake disaster. For future earthquake prediction, seismic hazards could even be estimated quickly without obtaining detailed information about the fault plane.
Highlights
On August 8, 2017 at 13:19, an earthquake with magnitude Ms7.0 occurred in Jiuzhaigou County of Sichuan Province at the eastern margin of the Tibetan Plateau
Comparison of the different models Using the model parameters listed in Table 2, we simulated the ground-motion record and compared it with the observed acceleration time series and Fourier amplitude spectra (FAS) as well as the 5%-damped pseudo-acceleration response spectra (PSA) in the EW and NS directions for all selected stations
For the FAS and 5%-damped PSA, we used the horizontal-component geometric mean of the observed ground motion to compare with the simulated record
Summary
On August 8, 2017 at 13:19 (local time), an earthquake with magnitude Ms7.0 occurred in Jiuzhaigou County of Sichuan Province at the eastern margin of the Tibetan Plateau. According to the China Earthquake Networks Center (CENC 2017), the epicenter was located at 33.20°N, 103.82°E and had a focal depth of 20 km. This powerful earthquake significantly impacted society and the natural environment. The Jiuzhaigou earthquake was located in the region between the eastern Kunlun fault system and the Longmen Shan fault system. This region is tectonically complex with high seismicity, which is related to the extrusion of the Indian Plate to the Eurasian Plate. According to the focal mechanism solutions and the spatial distribution of aftershocks, the seismogenic fault for the Jiuzhaigou earthquake was a left-lateral strike-slip fault and is
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