Abstract
On May 21, 2021, at 21:48 local time, an earthquake with a moment magnitude of 6.1 occurred in Yangbi County, Yunnan Province, China. By using the robust strong ground motion data released by the Yunnan Earthquake Agency, we selected five near-field stations (R < 100 km) and determined model parameters, such as the duration, spectral attenuation, stress drop, and site amplification factors of the 2021 Mw 6.1 Yangbi earthquake in China. These model parameters required for the simulation were fed into a stochastic finite-fault model of the corner frequency associated with a dislocation. The modified stochastic finite-fault method was applied to simulate the acceleration recordings of these five near-fault stations, and the acceleration response spectra and Fourier acceleration spectrum were obtained. Comparative observation results reveal that the key input parameters extracted from a few stations and the revised approach established in the current study can adequately predict the near-fault ground motion at high frequencies of the Yangbi earthquake and can demonstrate the contribution of areas with large slips to radiated energy. The proposed method can provide a basis for postdisaster rescue and seismic building design for this region.
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Acknowledgements
The authors would like to express gratitude to Prof. D. Motazedian, the main author of EXSIM, for his valuable comments. Finally, the authors would also like to thank the Editor-in-Chief Andreas Langousis and four anonymous reviewers for their valuable comments.
Funding
This work was supported by the National Key Research and Development Program of China (Grant No. 2022YFC3003601), the National Natural Science Foundation for Young Scientists of China (Grant No. 42204050), the Postdoctoral Office of Guangzhou City, China (Grant No. 62216242), the Postdoctoral Program of International Training Program for Young Talents of Guangdong Province, and the National Natural Science Foundation of China (Grant Nos. 52020105002 and 51878192).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Pengfei Dang. The first draft of the manuscript was written by Pengfei Dang and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Dang, P., Cui, J. & Liu, Q. Estimation of model parameters and simulation of earthquake ground motion by stochastic finite-fault modelling based on a modified slip-related corner frequency. Stoch Environ Res Risk Assess 38, 489–501 (2024). https://doi.org/10.1007/s00477-023-02582-2
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DOI: https://doi.org/10.1007/s00477-023-02582-2