2017年九寨沟MS7.0地震场地特征分析

地震 ›› 2019, Vol. 39 ›› Issue (4): 147-157.

2017年九寨沟M_S7.0地震场地特征分析

吴效勇, 王晓青, 袁小祥, 窦爱霞, 丁香

中国地震局地震预测研究所, 北京 100036

收稿日期:2019-05-29 出版日期:2019-10-31 发布日期:2019-10-30
通讯作者: 王晓青, 研究员。 E-mail:wangxiaoq517@163.com
作者简介:吴效勇(1992-), 男, 山东菏泽人, 硕士研究生, 主要从事遥感与GIS应用研究。
基金资助:
国家重点研发计划项目(2017YFB0504104)

Analysis of Site Characteristics of the 2017 Jiuzhaigou M_S7.0 Earthquake

WU Xiao-yong, WANG Xiao-qing, YUAN Xiao-xiang, DOU Ai-xia, DING Xiang

Earthquake Forecasting Institute, CEA, Beijing 100036, China

Received:2019-05-29 Online:2019-10-31 Published:2019-10-30

摘要/Abstract

摘要： 场地条件对地震动具有较大影响, 研究不同场地条件下的地震动特征对地震动的校正具有重要意义。本文以九寨沟地震为例, 收集了66个台站的198条三分量强震观测记录和SRTM(Shuttle Radar Topography Mission)公里格网的DEM(Digital Elevation Model)数据, 从多个角度对场地特征进行分析。首先根据坡度法使用DEM数据对九寨沟特征进行了场地分类, 然后讨论了不同场地类型下的加速度时程、加速度反应谱、地震动衰减等地震动特征。研究表明, 缺少实测资料的情况下, 地形坡度可以作为Vs30(地表以下30 m范围的平均剪切波速度)的一种替代指标, 利用坡度法可以较快速地对场地进行分类; 利用强震观测记录能够从多角度对台站的场地特征进行分析, 不同场地类型对地震动影响不同, 其中, 土层对地震动具有明显的放大效应。该结论可以为地震动结果的校正提供依据。

关键词: DEM, 强震记录, PGA, 场地分类, 场地特征

Abstract: Site conditions have great influences on ground motion. It is important for ground motion correction to study its characteristics under different site conditions. Taking Jiuzhaigou earthquake as an example, 198 3-component seismic ground motion records at 66 stations and kilometer grid DEM (Digital Elevation Model) data from Shuttle Radar Topography Mission are collected, and site characteristics are analyzed from several aspects. Firstly, the site of Jiuzhaigou area is classified by using DEM data according to Wald’s gradient method. Then the characteristics of acceleration time history, acceleration response spectrum and ground motion attenuation are discussed under different site types. The results show that, in the absence of measured data, topographic slope can be used as an alternative index of Vs30, and the site can be classified quickly by slope method. The site characteristics of the stations can be analyzed from different aspects by using seismic ground motion records. Different site types exhibit different effects on the ground motion, and the soil layer shows obvious amplification effect on the ground motion. The results in this paper can provide a basis for the correction of ground motion.

Key words: DEM, Seismic ground motion records, PGA, Site classification, Site characteristics

中图分类号:

P694

吴效勇, 王晓青, 袁小祥, 窦爱霞, 丁香. 2017年九寨沟M_S7.0地震场地特征分析[J]. 地震, 2019, 39(4): 147-157.

WU Xiao-yong, WANG Xiao-qing, YUAN Xiao-xiang, DOU Ai-xia, DING Xiang. Analysis of Site Characteristics of the 2017 Jiuzhaigou M_S7.0 Earthquake[J]. EARTHQUAKE, 2019, 39(4): 147-157.

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