2017年8月8日四川九寨沟7.0级地震强震记录及特征分析
Strong Motion Records and Its Characteristics in JiuzhaigouMS 7.0 Earthquake on August 8, 2017

2017年8月8日四川九寨沟县发生7.0级地震，中国数字强震动台网布设在四川、甘肃、陕西、宁夏的66个强震台获得主震加速度记录。本文首先对198条三分向强震记录进行常规处理，计算出近场强震记录的加速度峰值随震中距的分布情况；再根据2个典型台站的加速度时程记录，通过计算其加速度反应谱并与设计反应谱比较，分析本次地震的基本特征；然后将实际观测数据与意大利新一代地震动衰减公式对比，分析峰值加速度（PGA）及谱加速度的衰减关系；最后结合已有的工程场地钻探资料，采用H/V谱比法对2个不同类别的典型台站进行地场地效应分析，发现该方法能很好地反映实际台站场地的反应特征。
An MS7.0 earthquake occurred on August 8,2017,at Jiuzhaigou county,Sichuan province.66 strong motion stations installed in the provinces of Sichuan,Gansu,Shaanxi and Ningxia have been fully triggered,and 198 groups of three-component acceleration records in the main shock were obtained by NSMONS.In this study,the distribution of 198 groups of three-component acceleration records within different epicenter distances were first calculated after a conventional analysis.The basic characteristics of this earthquake were analyzed based on the acceleration time-history curves of two typical stations.Then,the attenuation relation of PGAs and spectral accelerations within different distances were analyzed by comparing the observed data with Italy08 GMPE (ground motion prediction equation).Finally,combining drilling data of engineering sites,the spectral ratio curves were calculated based on the strong motion data from two typical stations.It is found that the horizontal to vertical (H/V) spectral ratio method can well reflect the response characteristics of actual site situation.