Simulation of the Jiuzhaigou, China, earthquake by stochastic finite-fault method based on variable stress drop

Pengfei Dang (), Qifang Liu () and Jian Song ()
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Pengfei Dang: China Earthquake Administration
Qifang Liu: Suzhou University of Science and Technology
Jian Song: China Earthquake Administration

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2020, vol. 103, issue 2, No 33, 2295-2321

Abstract: Abstract An improved stochastic finite-fault method was used to simulate the Mw 6.6 earthquake that occurred on August 8, 2017, in Jiuzhaigou, Sichuan, China. A variation of the stochastic finite-fault method, considering the dynamic corner frequency, was used to overcome the corner frequency. It explains the effect of a given slip distribution on the corner frequency of each subfault. A comparison of the response spectra (damping ratio 5%), spectral ratio (simulated values/observed values), and model deviation demonstrated that the improved corner frequency performs well for the whole periods, especially in short periods from 0.2 to 1 s. Similarly, the revised duration model and the site-amplification factor were applied to simulate the ground motion during the Jiuzhaigou earthquake, and then the response spectra were obtained. The duration of the nine near-field station recordings matched well with the simulated ground motions, and the peak ground acceleration (PGA) of most of the stations matched well with the observed PGA. In the short periods (T

Keywords: Stochastic finite-fault method; Dynamic corner frequency; Jiuzhaigou earthquake; Response spectra; Site amplification (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1007/s11069-020-04083-9

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