2022年四川泸定M_(S)6.8地震近场强震动模拟  

Near-Field Strong Motion Simulation of the 2022 Luding M_(S)6.8 Earthquake in Sichuan Province

作　　者：王玉婕 张丽芬[1] 孙晓丹 赵艳南[1] 李井冈[1] WANG Yujie;ZHANG Lifen;SUN Xiaodan;ZHAO Yannan;LI Jinggang(Institute of Seismology,CEA,40 Hongshance Road,Wuhan 430071,China;School of Civil Engineering,Southwest Jiaotong University,999 Xi’an Road,Chengdu 611756,China)

机构地区：[1]中国地震局地震研究所,武汉市430071 [2]西南交通大学土木工程学院,成都市611756

出　　处：《大地测量与地球动力学》2023年第5期441-446,516,共7页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(42174177,62106239);湖北省自然科学基金(2021CFA035);中国地震局地震科技星火计划(XH19030);中国长江三峡集团有限公司项目(0799216)。

摘　　要：基于随机有限断层模拟方法,选取2022年四川泸定地震近场100 km范围内9个触发强震台站进行强震动模拟。根据实测与模拟残差最小原则,确定此次强震动模拟的合理输入参数,并在此基础上获取地震峰值加速度的空间分布特征。研究结果表明,除JLT台外,大部分台站在0.05~1 s周期段的峰值加速度PGA及反应谱PSA的模拟结果与实际观测结果较为吻合,较好地预测了地震动。基于模拟结果给出的泸定地震烈度图与发布的仪器烈度图较为一致,等震线长轴呈NW-SE向。Based on the stochastic finite fault simulation method,9 triggered strong motion earthquake stations within 100 km near field of the 2022 Luding earthquake in Sichuan were selected to simulate the strong motion.According to the principle of minimum residual between the measured and simulated,the reasonable input parameters for the simulation of the strong motion are determined,and the spatial distribution characteristics of the peak acceleration of the earthquake are obtained.The results show that,except for JLT station,the peak acceleration and response spectrum simulation results fit well with the actual observation in the period of 0.05 to 1 s.The amplitude and the spectral shape are similar,and the ground motion can be predicted well.The Luding seismic intensity map based on the simulation results is consistent with the published instrument intensity map,and the long axis of the isoseismic line shows a NW-SE direction.

关 键 词：强震动模拟 随机有限断层法 泸定地震 

分 类 号：P315[天文地球—地震学]