基于地震学的西南地区地震动峰值加速度衰减关系研究

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (5) : 191-196.

地震科学与结构抗震

基于地震学的西南地区地震动峰值加速度衰减关系研究

郑兴群，赵伯明*

作者信息 +

Attenuation relation of PGAs in southwest China based on seismology

ZHENG Xingqun, ZHAO Boming*

Author information +

文章历史 +

摘要

收集和筛选西南地区2009年至2022年5级以下中小震的强震记录构建支撑本研究的数据集。将几何扩散项和非弹性衰减项分开确定，先采用最小二乘法分段拟合几何分段点数值，计算结果为R1值为74 km，R2值为125 km。然后借助遗传算法，反演得到4个区域地壳介质参数，其中应力降为77.06 MPa，品质因子参数Q0和η分别为223.13和0.5697，近地表高频衰减参数κ0为0.0686 s。根据反演得到的地壳介质参数计算加速度傅氏谱同时配合随机相位谱，从而得到某一震级、震中距下的地震动时程，提取其PGA建立西南地区地震动峰值加速度衰减关系。研究结果显示新建立的衰减关系和实际强震记录吻合很好，尤其在近场区域，这将为西南地区的工程建设提供重要的参照意义。

Abstract

All strong ground motion records in southwest China from 2009 to 2022 were collected, and small ground motion records of strong earthquake data below magnitude 5 were selected to form a data set. The geometric spreading term and the anelastic attenuation term were determined separately. Firstly, the least square method was used to piecewise fit the geometric segment points value, and the calculated results are 74 km for R1 and 125 km for R2. Then the four regional crustal medium parameters were obtained by genetic algorithm inversion: the stress drop is 77.06 MPa, the quality factor Q0 and η are 223.13 and 0.5697 respectively, and the near-surface high frequency attenuation parameter κ0 is 0.0686 s. Based on the inversion of crustal parameters, the acceleration Fourier spectrum was calculated, and the time history of ground motion under a certain magnitude and epicenter was obtained with random phase spectrum. The attenuation relationship of peak acceleration of ground motion in southwest China was established by extracting PGA. The results show that the attenuation relationship established is in good agreement with the actual strong earthquake records, especially in the near field area, which will provide important reference for the engineering construction in southwest China.

导出引用

郑兴群, 赵伯明. 基于地震学的西南地区地震动峰值加速度衰减关系研究[J]. 振动与冲击, 2025, 44(5): 191-196

ZHENG Xingqun, ZHAO Boming. Attenuation relation of PGAs in southwest China based on seismology[J]. Journal of Vibration and Shock, 2025, 44(5): 191-196

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