用双子地震相干函数法对常熟震群进行精确相对定位
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摘要
采用双子地震相干函数分析法利用江苏区域遥测地震台网数字化资料对2001年11月3-14日发生在江苏省常熟-张家港间的震群进行精确相对定位。主参考地震用区域地壳结构重新定位。结果表明:(1)主参考地震与区域遥测地震台网的定位相比偏离了10.61 km;(2)震群中地震的平面位置更集中;(3)各次地震的震源深度体现了震群特征。本文还对震群与构造的关系进行了分析,推测可能与顾山-虞山断裂有关。
During Nov.3-14,2001,a earthquake swarm with M1.5～3.7 occurred between Changshu city and Zhangjiagang city,in Jiangsu province.Based on the digital data recorded by the telemetered seismic network of Jiangsu province,using the Seismic Doublet Coherence Function Method(DCFM),this swarm is relatively relocated in this paper.The main event of the swarm is relocated by local crust model travel time table.The results demonstrate:(1) The main event is separated 10.61 km from the original one;(2) The swarm's epicenters are more close each other than the original distribution.(3) The focus depths are 16.5～17.5 km,which can not be determined in original way.The relationship between relocated swarm and tectonics is discussed also.
During Nov.3-14,2001,a earthquake swarm with M1.5～3.7 occurred between Changshu city and Zhangjiagang city,in Jiangsu province.Based on the digital data recorded by the telemetered seismic network of Jiangsu province,using the Seismic Doublet Coherence Function Method(DCFM),this swarm is relatively relocated in this paper.The main event of the swarm is relocated by local crust model travel time table.The results demonstrate:(1) The main event is separated 10.61 km from the original one;(2) The swarm's epicenters are more close each other than the original distribution.(3) The focus depths are 16.5～17.5 km,which can not be determined in original way.The relationship between relocated swarm and tectonics is discussed also.
引文
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[2]Douglas A.Joint epicenter determination[J].Nature,1976,215:45-48.
[3]Spence W.Relative epicenter determination using P-wave arri-val-time differences[J].Bull.Seism.Soc.Am.,1980,70(1):171-183.
[4]高景春,胡斌,张从珍.用相对定位法精细测定张北地震序列的时空参数[J].华北地震科学,1999,17(1):42-46.
[5]周仕勇,许仲淮,韩京.主震定位法分析以及1997年新疆伽师强震群高精度定位[J].地震学报,1999,21(3):258-265.
[6]Waldhauser F,Ellsworth W L.A double-difference earthquakelocation algorithum:Method and application to the NorthernHayward fault,Calfornia[J].Bull.Seismol.Soc.Am.,2000,90:1353-1368.
[7]杨智娴,陈运泰,张宏志.张北-尚义地震序列的重新定位和发震构造[J].地震学报,2002,24(4):366-367.
[8]杨智娴,陈运泰,郑月军,等.双差地震定位法在我国中西部地区地震精确定位中的应用[J].中国科学,2003.,33(增刊):129-136.
[9]Poupinet G,W L Ellsworth,J Frechet.Monitoring velocityvariations in the crust using earthquake doublets:an applica-tion to the Calaveras fault,California[J].J.Geophys.Res.,1984,89:5719-5731.
[10]Akihiko Ito.High Resolution Relative Hypocenters of Simi-lar Earthquakes by Cross-Spectral Analysis Method[J].J.Phys.Earth.,1985,33:279-294.
[11]Haijiang ZHANG,Clifford H Thurber.Double-DifferenceTomography:The Method and Its Application to the Hay-ward Fault,California[J].Bull.Seism.Socie.Amer.,2003,93(5):1875-1889.
[12]李清河,闵祥仪,郭建康,等.爆源地震效应的分析方法[J].西北地震学报,1988,10(1):44-51.
[13]李清河,郭建康,付印发,等.迭部5.9级地震爆破地震波动力学特性的变化[J].地震研究,1989,12(4):314-327.
[14]景天永,田建明,薛军蓉,等.华东地区走时表(1988)的研究,全国各分区走时表[M].北京:地震出版社,1988.
[15]张裕中,顾瑾平,杨彩霞,等.常熟─太仓地震的震源参数[J].地震学刊,1990(1):81.
[16]江苏省地震局分析预报中心.常熟-太仓5.1级地震的综合监测预报过程[J].地震学刊,1990(4):14-23.
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