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Lang Z P,Yu R F,Xiao L,Fu L,Zhou J. 2022. An estimation model of high frequency attenuation coefficient of ground motion for local site. Acta Seismologica Sinica,44(0):1−10 doi: 10.11939/jass.20220053
Citation: Lang Z P,Yu R F,Xiao L,Fu L,Zhou J. 2022. An estimation model of high frequency attenuation coefficient of ground motion for local site. Acta Seismologica Sinica44(0):1−10 doi: 10.11939/jass.20220053

An estimation model of high frequency attenuation coefficient of ground motion for local site

doi: 10.11939/jass.20220053
  • Available Online: 2022-09-30
  • When using the stochastic finite fault method for ground motion simulation, how to select reasonable parameters to describe the near-surface high-frequency attenuation characteristics of a specific local site has important practical significance for evaluating the correctness of ground motion simulation results. In the prediction of ground motion parameters of engineering sites, how to quickly determine the value of this parameter is an urgent problem to be solved in practical applications. Firstly, the correlation that between the high-frequency attenuation coefficient κ0 of the site and the average shear wave velocity vS30 was analyzed; Then, based on the 546 κ0 coefficients calculated by domestic and foreign scholars, the root mean square value of κ0 in a certain time window was used to discuss its variation trend with the increase of the average shear wave velocity vS30.The results showed that although κ0 had obvious regional differences, its root mean square value showed a decreasing trend with the increase of vS30In order to obtain a reasonable κ0 estimation model, the linear function, polynomial function, logarithmic linear function and log-log linear function were used to preliminarily fit the relationship between the root mean square value of κ0 and vS30. The results show that the logarithmic linear function can be better describe the relationship between κ0 and vS30. Finally, based on the 477 data obtained from the screening, the model parameters were fitted by the least square method, and a practical model of κ0- vS30 suitable for engineering applications was obtained. The analysis of the applicability of the model shows that the κ0 estimation model constructed in this study can reasonably estimate the high-frequency attenuation of ground motion when predicting site ground motion parameters.


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