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

Author

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  • Pengfei Dang

    (China Earthquake Administration)

  • Qifang Liu

    (Suzhou University of Science and Technology)

  • Jian Song

    (China Earthquake Administration)

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

Suggested Citation

  • Pengfei Dang & Qifang Liu & Jian Song, 2020. "Simulation of the Jiuzhaigou, China, earthquake by stochastic finite-fault method based on variable stress drop," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 103(2), pages 2295-2321, September.
    • Handle: RePEc:spr:nathaz:v:103:y:2020:i:2:d:10.1007_s11069-020-04083-9
    DOI: 10.1007/s11069-020-04083-9
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    References listed on IDEAS

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    1. Pengfei Dang & Qifang Liu, 2020. "Stochastic finite-fault ground motion simulation for the Mw 6.7 earthquake in Lushan, China," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 100(3), pages 1215-1241, February.
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    Cited by:

    1. Pengfei Dang & Jie Cui & Qifang Liu, 2023. "Site amplification and rupture velocity in EXSIM and updated EXSIM during the 2017 Mw6.6 Jiuzhaigou, China earthquake," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 116(1), pages 1105-1123, March.

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    1. Pengfei Dang & Jie Cui & Qifang Liu, 2023. "Site amplification and rupture velocity in EXSIM and updated EXSIM during the 2017 Mw6.6 Jiuzhaigou, China earthquake," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 116(1), pages 1105-1123, March.

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