汶川地震近断层地震动峰值加速度衰减关系研究  

Attenuation relationship of peak ground acceleration near the fault of the Wenchuan earthquake

作　　者：李平 徐建元 鞠雅倩 陈钰鑫 欧阳刚垒 宣雨童 沙明卓 LI Ping;XU Jian‑yuan;JU Ya‑qian;CHEN Yu‑xin;OUYANG Gang‑lei;XUAN Yu‑tong;SHA Ming-zhuo(College of Geological Engineering,Institute of Disaster Prevention,Sanhe 065201,China;Key Laboratory of Earthquake Disaster Prevention and Risk Assessment of Hebei Province,Sanhe 065201,China;Municipal Planning and Engineering Design Institute,Jiangsu Provincial Planning and Design Group Co.,Ltd.,Nanjing 210019,China;Nuclear Industry Shaft Construction Group Co.,Ltd.,Huzhou 313001,China;Shenyang Water Supply&Drainage Prospecting Design Research Institute Co.,Ltd.,Shenyang 110023,China)

机构地区：[1]防灾科技学院地质工程学院,河北三河065201 [2]河北省地震灾害防御与风险评价重点实验室,河北三河065201 [3]江苏省规划设计集团有限公司市政规划与工程设计院,江苏南京210019 [4]核工业井巷建设集团有限公司,浙江湖州313001 [5]沈阳市给排水勘察设计研究院有限公司,辽宁沈阳110023

出　　处：《振动工程学报》2024年第11期1875-1883,共9页Journal of Vibration Engineering

基　　金：河北省高等学校科学技术研究计划项目(ZD2022166);中国地震局地震科技星火计划资助项目(XH204401);防灾科技学院研究生创新基金资助项目(ZY20220323)。

摘　　要：本文选取2008年汶川8.0级特大地震断层距41 km内13个土层台站的强震记录,结合以随机有限断层法模拟得到的29个计算点的强震记录,采用三种近断层地震动衰减模型和第五代地震动参数区划图衰减模型进行了非线性最小二乘法拟合,得到了汶川地震近断层地震动峰值加速度衰减关系,并通过±1倍标准差和相关性系数进行可靠性分析。结果表明,采用不同衰减模型得到的衰减关系有一定的差异:邵广彪模型得到的峰值加速度偏低;王国权模型因没有考虑震级项,其预测结果针对其他震级的地震会产生较大偏差;第五代地震动参数区划图衰减模型得到的峰值加速度偏低。In this paper,the strong earthquake records of 13 soil stations within 41 km from the fault of the 2008 Wenchuan 8.0 magnitude earthquake are selected.These records are combined with the strong earthquake records of 29 calculation points obtained by using the stochastic finite fault method simulation.Moreover,nonlinear least squares fitting is performed by using three near-fault ground motion attenuation models and the fifth-generation ground motion parameter zoning map attenuation model to obtain the peak ground motion acceleration of the Wenchuan earthquake near-fault.The attenuation relationships are obtained and analyzed by considering±1 times standard deviation and correlation coefficients for reliability.The results show that there are some differences in the attenuation relations obtained by different attenuation models.The peak acceleration obtained by the Shao Guangbiao model is low.The prediction results of Wang Guoquan model has a large deviation for other magnitude earthquakes because the magnitude term is not considered.Besides,the peak acceleration of the fifth-generation ground motion parameter zoning map attenuation model is low.

关 键 词：汶川地震 近断层地震动 随机有限断层法 衰减关系 标准差 

分 类 号：P315.9[天文地球—地震学]