利用FOCMEC方法反演2011年江西瑞昌与湖北阳新交界M_S4.6地震的震源机制解
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摘要
利用FOCMEC方法反演了2011年9月10日江西瑞昌与湖北阳新交界MS4.6地震的震源机制解。反演结果为:节面I的走向304°,倾角76°,滑动角4°;节面Ⅱ的走向213°,倾角86°,滑动角165°;P轴的方位角、倾角分别为260°、7°;T轴的方位角、倾角分别为168°、13°;B轴的方位角、倾角分别为19°、75°。其中节面Ⅱ的走向和活动性质与震中附近的郯庐断裂带的分支断裂——池河—西山驿断裂较为接近。分析认为NNE向的池河—西山驿断裂可能是瑞昌—阳新MS4.6地震的发震构造。
The focal mechanism of 2011 MS4.6 earthquake in the border region of Jiangxi Ruichang and Hubei Yangxin has been inversed by using FOCMEC method.The result is as follows:the strike,dip and rake angles of nodal plane I are 304°,76° and 4°.And those of nodal planeⅡ are 213°,86°and 165°.The azimuth and dip angle are 260°and 7° for P axis,168° and 13° for T axis,19° and 75° for B axis.The strike angle and activity characteristic are in accord with the branch fault of Tan-Lu fault zone,Chihe-Xishan Yi fault,which is near the epicenter.So it is analyzed that NNE trend Chihe-Xishan Yi fault may be the causative fault of Ruichang-Yangxin MS4.6 earthquake.
The focal mechanism of 2011 MS4.6 earthquake in the border region of Jiangxi Ruichang and Hubei Yangxin has been inversed by using FOCMEC method.The result is as follows:the strike,dip and rake angles of nodal plane I are 304°,76° and 4°.And those of nodal planeⅡ are 213°,86°and 165°.The azimuth and dip angle are 260°and 7° for P axis,168° and 13° for T axis,19° and 75° for B axis.The strike angle and activity characteristic are in accord with the branch fault of Tan-Lu fault zone,Chihe-Xishan Yi fault,which is near the epicenter.So it is analyzed that NNE trend Chihe-Xishan Yi fault may be the causative fault of Ruichang-Yangxin MS4.6 earthquake.
引文
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[14]许忠淮,阎明,赵忠和.由多个小地震推断的华北地区构造应力场的方向[J].地震学报,1983,5(5):268-279.
[15]姚大全,刘加灿.郯庐断裂带池河段的新活动[J].地震学报,2004,26(6):616-622.
[2]Kisslinger C,Bowman J R,Koch K.Procedures forcomputing focal mechanisms from local(SV/P)z data[J].Bull Seis Soc Amer,1981,71(6):1719-1730.
[3]梁尚鸿,李幼铭,束沛镒,等.利用区域地震台网P、S振幅比资料测定小震震源参数[J].地球物理学报,1984,27(3):249-256.
[4]吴大铭,王培德,陈运泰.用SH波和P波振幅比确定震源机制解[J].地震学报,1989,11(3):275-278.
[5]Snoke J A,Munsey J W,Teague A G,et a1.Aprogram for focal mechanism determination bycombined use of polarity and SV-P amplitude ratiodata[J].Earthquake Notes,1984,55(3):15-20.
[6]Snoke J A.Earthquake mechanism[A].James D E.Encyclopedia of Geophysics[C].New York:VanNostrand Reinhold Company,1989:239-245.
[7]Snoke J A,Clyde and the Gopher.A preliminary ana-lysis of the 12 May 1990 Sakhalin Island event[J].Seism Res Letters,1990,61:161.
[8]Snoke J A.FOCMEC:Focal Mechanism Determinati-ons[M].International Handbook of Earthquake andEngineering Seismol—ogy,Part B.Academic Press,Chap,2003,85.12:1629-1630.
[9]Snoke J A.Traveltime Tables for iasp91 and ak135.Seism.Res.Letters,2009,80(2):260-262.
[10]刘杰,郑斯华,康英,等.利用P波和S波的初动和振幅比计算中小地震的震源机制解[J].地震,2004,24(1):19-26.
[11]倪红玉,刘泽民,沈小七,等.利用FOCMEC方法震源机制解的影响因素分析[J].华北地震科学,2011,29(3):1-7.
[12]笠原庆一.地震力学[M].北京:地震出版社,1984:28-49.
[13]王椿镛,张先康,陈步云,等.大别造山带地壳结构研究[J].中国科学(D辑),1997,27(3):221-226.
[14]许忠淮,阎明,赵忠和.由多个小地震推断的华北地区构造应力场的方向[J].地震学报,1983,5(5):268-279.
[15]姚大全,刘加灿.郯庐断裂带池河段的新活动[J].地震学报,2004,26(6):616-622.
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