九寨沟M_(S)7.0地震强地震动模拟及参数敏感性分析  

Strong Ground Motion Simulation and Parameter Sensitivity Analysis of the Jiuzhaigou M_(S)7.0 Earthquake

作　　者：李明会 景月岭[1,2] 张宇璇 郑司元 宛明晨 何李浩 LI Minghui;JING Yueling;ZHANG Yuxuan;ZHENG Siyuan;WAN Mingchen;HE Lihao(College of Civil Engineering,Hefei University of Technology,193 Tunxi Road,Hefei 230001,China;State Key Laboratory of Hydroscience and Engineering,1 Qinghuayuan,Beijing 100089,China)

机构地区：[1]合肥工业大学土木与水利工程学院,合肥市230001 [2]水沙科学与水利水电工程国家重点实验室,北京市100089

出　　处：《大地测量与地球动力学》2022年第10期1025-1033,共9页Journal of Geodesy and Geodynamics

基　　金：中央高校基本科研业务费专项(PA2019GDPK0036);水沙科学与水利水电工程国家重点实验室开放基金(sklhse-2020-D-04)。

摘　　要：对2017年九寨沟M_(S)7.0地震进行强地面运动模拟,应用复合震源模型建立特定圆形子震分布的断层破裂运动学模型,对地震矩、应力降、破裂速度、子断层尺寸和震源深度等参数进行敏感性分析,得到一组合理的震源参数,然后基于复合震源模型计算得到该地区地震动,最后与观测的峰值加速度(PGA)、反应谱和PGA的空间分布特征进行对比。结果表明,该模型整体上可以再现各台站地震动强度特征,验证了复合震源模型计算强地面运动的有效性,同时敏感性规律也为复合震源模型计算缺乏强震记录区域的地震动参数的变化区间提供了依据。We use the composite source model to simulate the strong ground motion of the 2017 Jiuzhaigou M_(S)7.0 earthquake,generating a specific circular subevent distribution with kinematic model of fault rupture.After parameter sensitivity analysis of seismic moment,stress drop,rupture velocity,sub-fault size and focal depth,we obtain a set of reasonable focal parameters.Based on the composite source model,we calculate the ground motion in this area,comparing it with observed data such as peak ground acceleration(PGA),response spectrum and PGA distribution characteristics.The results of simulations show that the calculated ground motion waveform is very close to the observed data.This verifies the validity of the composite source model in calculating strong ground motion;the sensitivity law also provides a basis for the composite source model to calculate the change interval of ground motion parameters in areas lacking strong motion records.

关 键 词：强地面运动 九寨沟地震 复合震源模型 敏感性分析 峰值加速度 

分 类 号：P315[天文地球—地震学]