天山中东段地区震源参数的初步应用研究
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摘要
采用多台多地震联合反演的方法,首先得到了新疆天山中东段地区2001年以来MS≥2.5的105次中小地震的震源谱,进而测定了地震矩、拐角频率与应力降等震源参数,并讨论了它们之间的相互关系。在此基础上开展了该研究区应力降时空变化的动态跟踪工作,最后对研究区2004年6月以前的应力降时空演化特征做了一定程度的探讨。分析表明,该地区的地震矩、拐角频率与应力降等震源参数与震级有一定的相关性,应力降的时空演化特征可以作为该地区今后地震趋势预测的一种新手段。
We obtain the source spectrum of 105 M_S≥2.5 small-medium earthquakes occurred in the middle-east area of Tianshan mountain since 2001 using joint inversion method,determinate the seismic moment,corner frequency,stress drop and so on,and disscuss the relation between them.Base on it, we track the time and space change of stress drop in research region,and disscuss the evolvement characteristics of time and space of stress drop before Jun.2004.The result shows,the source parameters for example seismic moment,corner frequency and stress drop and so on is relative with magnitude,the evolvement characteristic of time and space of stress drop is a new measure for earthquake prediciton.
We obtain the source spectrum of 105 M_S≥2.5 small-medium earthquakes occurred in the middle-east area of Tianshan mountain since 2001 using joint inversion method,determinate the seismic moment,corner frequency,stress drop and so on,and disscuss the relation between them.Base on it, we track the time and space change of stress drop in research region,and disscuss the evolvement characteristics of time and space of stress drop before Jun.2004.The result shows,the source parameters for example seismic moment,corner frequency and stress drop and so on is relative with magnitude,the evolvement characteristic of time and space of stress drop is a new measure for earthquake prediciton.
引文
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[15]罗娣华,叶建庆,陈敏恭,等.丽江7.0级地震的余震震源参数研究[J].地震研究,1997,20(1):83-91.
[2]啜永清,苏燕,贾建喜,等.山西地区非弹性衰减系数、场地响应和几种震源参数的研究[J].地震学报,2004,26(4):369-378.
[3]康英,郑斯华,刘杰,等.中小地震震源参数的求解及其相似关系[J].华南地震,2004,24(2):11-21.
[4]刘红桂,缪发军,吴晶.场地响应、震源参数与介质衰减的同时反演[J].地震,2004,24(4):27-36.
[5]王勤彩,高景春,郑斯华,等.华北中北部地区震源参数和场地响应的联合反演[J].中国地震,2004,20(2):187-196.
[6]刘杰,郑斯华,黄玉龙.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.
[7]黄玉龙,郑斯华,刘杰,等.广东地区地震动衰减和场地响应的研究[J].地球物理学报,2003,46(1):54-61.
[8]赵翠萍,夏爱国,郑斯华,等.新疆北天山中东段地区震源参数研究[J].中国地震,2005,21(1):61-69.
[9]赵翠萍,张智强,夏爱国,等.利用数字地震波资料研究新疆北天山中东段地区的介质衰减特征[J].防灾减灾工程学报,2004.24(3):300-305.
[10]Brune J N.Tectonic stress and the spectrum of seismic shear waves from earthquakes[J].J.G.R.,1970,75:4 997-5 009.
[11]Kanamori H.The energy release in great earthquakes[J].J.G.R.,1977,82:1 981-1 987.
[12]Shi Jinhua,Kim W Y,Riehards P G.The corner frequencies and stress drops of intraplate earthquakes in the NortheasternUnited States[J].B.S.S.A.,1998,88(3):531-542.
[13]Jin Anshu,Moya C A,Ando M.Simultaneous determination of site response and source paramaters of small earthquakes alongthe Atotsugawa fault zone,Central Japan[J].B.S.S.A.,2000,90(6):1 430-1 445.
[14]中国地震局监测预报司.华北地区强地震短期前兆特征与预测方法研究[M].北京:地震出版社,2005.
[15]罗娣华,叶建庆,陈敏恭,等.丽江7.0级地震的余震震源参数研究[J].地震研究,1997,20(1):83-91.
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