2019-12-26湖北应城M4.9地震强震动特征分析  

Characteristics of Strong Motion Recordings of Hubei Yingcheng M4.9 Earthquake on 26 December 2019

作　　者：李恒[1,2] 雷东宁 范珂显[1] LI Heng;LEI Dongning;FAN Kexian(Key Laboratory of Earthquake Geodesy,Institute of Seismology,CEA,40 Hongshance Road,Wuhan 430071,China;Wuhan Institute of Earthquake Engineering Co Ltd,40 Hongshance Road,Wuhan 430071,China)

机构地区：[1]中国地震局地震研究所地震大地测量重点实验室,武汉市430071 [2]武汉地震工程研究院有限公司,武汉市430071

出　　处：《大地测量与地球动力学》2020年第6期551-554,576,共5页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震研究所基本科研业务费和中国地震局地壳应力研究所基本科研业务费专项(IS201916294)。

摘　　要：对2019-12-26湖北应城M4.9地震的强震加速度记录进行基线校正和滤波处理,分析地震动场的分布特征。结果表明,此次地震记录的峰值加速度(PGA)随距离衰减较快;场地效应、上盘效应和破裂方向性效应共同导致地震动产生巨大差异。对应城地震台的强震记录进行旋转,其顺断层方向记录与垂直断层向和垂直向记录差异明显,存在一段周期约为0.3 s的类简谐强震动,与以走滑为主的震源机制相吻合。Based on strong motion acceleration records of Hubei Yingcheng M4.9 earthquake on 2019-12-26,we process the baseline correction and filtering and analyze the distribution characteristics of the ground motion.The results show that the peak ground acceleration(PGA)recorded in this earthquake attenuate rapidly with distance;the site effect,the hanging wall effect,and the rupture directivity effect cause the great differences among the ground motions.The data recorded at Yingcheng station are processed by rotating correction.There are obvious differences between the records along fault direction and those in perpendicular-to-fault direction and vertical direction,in which exists an analogous simple harmonic strong motion with a period of about 0.3 s,which is consistent with the focal mechanism mainly characterized by strike slip.

关 键 词：强震记录 场地效应 上盘效应 方向性效应 

分 类 号：P315[天文地球—地震学]