1999年中国台湾集集M_(W)7.6地震跨断层场地相对运动  

Relative motions between cross-fault sites resultd from the 1999 M_(W) 7.6 Taiwan,China Chi-Chi earthquake

作　　者：徐龙军 吕淼 张恒 于越 谢礼立 Xu Longjun;LV Miao;Zhang Heng;Yu Yue;Xie Lili(State Key Laboratory of Precision Blasting,Jianghan University,Wuhan 430056,China;Department of Civil Engineering,Harbin Institute of Technology,Weihai,Shandong Weihai 264209,China;Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,China Earthquake Administration,Harbin 150080,China;Department of Civil and Environmental Engineering,Stanford University,California 94305,USA)

机构地区：[1]江汉大学精细爆破国家重点实验室,武汉430056 [2]哈尔滨工业大学(威海)土木工程系,山东威海264209 [3]中国地震局工程力学研究所,哈尔滨150080 [4]中国地震局地震工程与工程振动重点实验室,哈尔滨150080 [5]斯坦福大学土木与环境工程系,美国加利福尼亚州94305

出　　处：《地震学报》2024年第3期425-441,共17页Acta Seismologica Sinica

基　　金：国家自然科学基金委员会-中国地震局地震科学联合基金(U2139207);湖北省自然科学基金(创新群体)重点项目(2023AFA030)共同资助。

摘　　要：为了获得近断层地震动准确的残余位移信息,提出了一种变步长网格搜索地震动基线校正方法。首先基于1999年我国台湾M_(W)7.6集集地震强震动数据,探讨了近断层地震动的位移特征,然后通过地震动时程初始时刻的校正获得了集集地震多组上、下盘台站之间的相对运动时程数据,分析了分别靠近断层上、下盘场地之间相对运动的位移时程特征。结果显示:近断层地震动的滑冲效应显著,断层的平均滑冲速度可高达1.4 m/s;断层两盘间的相对运动类似于近断层地震动的运动特征,且幅值更大;近断层的残余位移约是断层两盘间最大相对位移的80%.In order to obtain more accurate residual displacement information generated by near-fault ground motion,this paper proposed a variable step-grid search method for ground motion baseline correction.The core of this method lies in preserving and accurately reflecting the residual displacement information of faults,and solving the problem of extremely low computational efficiency in traditional grid search methods when there are many digital seismic sampling points.Based on the strong ground motion data of the 1999 M_(W)7.6 Chi-Chi earthquake in Taiwan region,this paper uses the variable step-grid search method for ground motion baseline correction to conduct in-depth research on the ground motion displacement characteristics near faults.By accurately correcting the initial moment of ground motion time history,this study successfully obtained relative ground motion time history data between multiple sets of the hanging and foot wall stations in the Chi-Chi earthquake.And based on this data,the displacement time history characteristics of the relative motion between the hanging and foot wall sites near the fault were analyzed.The research results indicate that the fling-step effect of ground motion is particularly significant in the Chi-Chi earthquake.The maximum displacement and residual displacement of near fault ground motion exceed 8 m and 6 m,respectively,and the average sliding velocity of the fault is as high as 1.4 m/s,fully demonstrating the strong destructive force of the earthquake.This poses challenges to the numerical simulation of fault rupture and related experimental researches.In addition,the relative motion between fault walls also exhibits similar motion characteristics to near fault ground motion,and its amplitude is larger.Therefore,the relative motion data between earthquake fault walls can refer to the time history of near fault ground motion as the input basis for engineering design and analysis.In addition,the residual displacement of the fault is about 80% of the maximum relative displaceme

关 键 词：1999年集集M_(W)7.6地震 近断层地震动 跨断层场地 相对运动 断层作用 

分 类 号：P315.8[天文地球—地震学]