祁连山中东段地区非弹性衰减系数、震源参数和场地响应研究

英文篇名：Study on Inelastic Attenuation Coefficient,Site Response and Source Parameters of the Middle-east Segment of Qilianshan Area
中文刊名：西北地震学报
英文刊名：Northwestern Seismological Journal
作者：郭晓 ; 张元生 ; 莘海亮 ; 张辉
英文作者：GUO Xiao1 ; 2 ; ZHANG Yuan-sheng1 ; 2 ; SHEN Hai-liang1 ; ZHANG Hui1(1.Lanzhou Institute of Seismology ; CEA ; Lanzhou 730000 ; China ; 2.Lanzhou Base of Institute of Earthquake prediction ; CEA ; Lanzhou 730000 ; China)
中文关键词：祁连山中东段 ; 非弹性衰减Q值 ; 场地响应 ; 震源参数
英文关键词：Middle-east segment of Qilianshan ; Inelastic attenuation Q value ; Site response ; Source parameter
出版日期：2007-12-30
机构：中国地震局兰州地震研究所,中国地震局兰州地震研究所,中国地震局兰州地震研究所,中国地震局兰州地震研究所甘肃兰州730000,中国地震局地震预测研究所兰州科技创新基地,甘肃兰州730000,甘肃兰州730000,中国地震局地震预测研究所兰州科技创新基地,甘肃兰州730000,甘肃兰州730000,甘肃兰州730000
年：2007
期：04
出版单位：西北地震学报

摘要

利用甘肃数字地震台网的波形记录,基于遗传算法,首先用Atkinson方法计算非弹性衰减系数,在此基础上用Moya方法同时反演震源参数和场地响应。反演结果表明,祁连山中东段地区非弹性衰减Q值与频率的关系为:Q(f)=687.9f0.460;除了湟源台(HYQ)外,其余台站的场地响应均有不同程度的放大效应;研究区地震的应力降范围为2~40 bar,优势分布在2~20 bar;震源参数拐角频率与地震矩、地震矩与震级之间存在依赖关系。
Using digital seismograms recorded by Gansu digital seismic network,the inelastic attenuation coefficient is calculated based on genetic algorithm and the method proposed by Atkinson.Then,the site response and source parameters are inversed by Moya method.The inversion results indicate that the frequency-dependent of inelastic attenuation Q value in the middle-east segment of Qilianshan is estimated as :Q(f)=687.9f0.460.Excepting Huangyuan station,the site response at other stations show amplifications in different extent.The stress drops of all 28 earthquakes range between 0.2 to 4 MPa,dominantly distribute between 0.2 and 2 MPa.The dependence of corner frequency on seismic moment,seismic magnitude is also found.

引文

[1]Atkinson G M,Boore D.New ground motion relations foreastern North America[J].Bul.l Seism.Soc.Amer.,1995,85:17-30.
    [2]Moya A,Aguirre J,Irikura K.Inversion of source parametersand site effects from strong ground motion records using genet-ic algorithms[J].Bul.l Seis.Soc.Amer.,2000,90(4):977-992.
    [3]刘杰,郑斯华,黄玉龙,等.利用遗传算法反演非弹性衰减系数、震源参数和场地响应[J].地震学报,2003,25(2):211-218.
    [4]Atkinson G M,Mereu R F.The shape of ground motion at-tenuation curves in Southeastern Canada[J].Bull.Seism.Soc.Amer.,1992,82:2014-2031.
    [5]黄玉龙,郑斯华,刘杰,等.华南地区地震波衰减和场地响应的研究[J].地球物理学报,2002,46(1):54-61.
    [6]苏有锦,刘杰,郑斯华,等.云南地区S波非弹性衰减Q值研究[J].地震学报,2006,28(2):206-212.
    [7]李永华,吴庆举,安张辉,等.青藏高原东北缘地质构造背景及地壳结构研究[J].地球物理学报,2006,49(5):1359-1368.
    [8]Brune J N.Tectonic stress and the spectra of seismic shearwaves from earthquake[J].J.Geophys.Res.,1970,75:4997-5009.