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  2019,Vol.14no.1 ,page:87-96

Preliminary Analysis of Long-period Ground Motion in Xingtai
Abstract:      The low velocity sediment on the plain is the main factor which generates the strong long-period waves. And the long-period ground motion may cause severe damage to high-rise buildings. We obtain crustal velocity structure including shallow part and historical earthquake source, and discrete wavenumber finite element method is used to calculate synthetic seismogram. Our results show that long-period ground motion will appear in strong earthquakes due to the existence of low velocity sediment in the Xingtai region. Then, the peak area we calculate and the meizoseismal area in the Xingtai earthquake appear to overlap. The amplification coefficient is larger than the seismic design code in 1.5-4s when epicentral distance is less than55 km, and amplification coefficient reaches peaks on 2s. The long-period part of the seismic design codes of Xingtai plain may exist shortage, more attention should be paid in the future.
Author NameAffiliation
Jia Xiaohui Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;Hebei Earthquake Agency, Shijiazhuang 050021, China 
Wang Xiaoshan Hebei Earthquake Agency, Shijiazhuang 050021, China 
Fu Changhua Institute of Geophysics, China Earthquake Administration, Beijing 100081, China 
Liu Aiwen Institute of Geophysics, China Earthquake Administration, Beijing 100081, China 
Keywords:    Long-period ground motion  Sedimentary plain  Discrete wavenumber finite element method  Response spectrum
Received on:  May 03, 2018
邢台地区长周期地震动特征初步分析
摘要:    沉积平原中存在地表低速沉积层是长周期地震动产生的关键因素,而长周期地震动会对长周期建筑物造成严重威胁和震害。本文基于邢台地震的历史地震震源模型和含地表沉积层的地壳速度模型,采用离散波数有限元法,对邢台地区进行了长周期地震动的计算分析。研究表明,邢台平原地区在大震中会产生长周期地震波,邢台地震中反应谱峰值区域位于宁晋南,与极震区基本重合。震中距小于55km区域内的周期1.5—4s的放大系数谱超过了抗震设计规范谱,反应谱放大系数值在周期2s附近达到峰值。因此,邢台地区因存在地表软弱沉积层,该区抗震设防可能对长周期地震动估计不足,建议应予以特别考虑。
关  键  词:长周期地震动  沉积平原  离散波数有限元法  反应谱
基金项目:国家自然科学基金(51778588),河北省地震科技星火计划(DZ20170328007)和河北省地震局强震发震构造与机理研究创新团队(DZ2018319009)共同资助
作者简介:贾晓辉,男,生于1987年。博士研究生,工程师。研究方向:地震动数值模拟。E-mail:jiaxiao_hui@126.com
引用本文格式:贾晓辉,王晓山,付长华,刘爱文.邢台地区长周期地震动特征初步分析[J].震灾防御技术英文版,2019,14(1):87-96  DOI:10.11899/zzfy20190109
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