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Title:: Strong Motion Record Characteristics and Site Response Analysis of the Tonghai M_S5.0 Earthquake Sequence in Yunnan province,2018

Author(s):: WANG Wencai; YIN Zhiwen; TIAN Xiufeng; XU Qin; SHI Wenbing; JIANG Zhijie; (Lanzhou National Geophysical Observation and Research Station,Lanzhou 730000,Gansu,China)

摘要:: 2018年8月13日和14日云南通海县相继发生2次5.0级地震,中国数字强震动台网的41个(13日)和30个(14日)强震台站在2次地震中共捕获到213条三分向加速度记录,给出近场台站的地震动参数,绘制了震中附近区域峰值加速度等值线图,其长轴呈WS—EN方向展布。将实际观测数据与几种常用地震动衰减关系对比,发现霍俊荣和胡聿贤(1992)的衰减预测模型能更好地反映此次地震影响场。将不同震中距的5个台站反应谱对比,并与我国设计反应谱比较,拟合出不同周期谱加速度的衰减特性,总结了地震的反应谱基本特征。最后基于主震和多次余震观测记录,运用HVSR谱比法分析了3个典型台站的场地效应,并对其是否发生非线性反应作了初步判断。

Abstract:: A major earthquake of M_S5.0 and aftershock of M_S5.0 occurred successively on August 13 and 14,2018,Tonghai County,Yunnan Province.There are 41 and 30 strong motion stations which located in this region have been fully triggered in the main and aftershock.213 records of three-component acceleration were obtained by NSMONS.In this paper,we first calculate the peak accelerations of the 213 strong motion records.The basic characteristics of amplitude in this earthquake were analyzed according to the acceleration time-series curves and contour line of PGAs.Then,the attenuation relationship of PGAs with different distance was analyzed by comparing the observed data with some commonly used GMPE(ground motion prediction equations).In order to summarize the characteristics of response spectrum,we compare the acceleration response spectra of some typical stations with the designed spectrum.The HVSR method has been used to analyze site effect and judge whether nonlinear response occur of 3 typical stations with main and multiple aftershocks records.