基于CAP方法的震源机制研究
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摘要
利用来源于湖北区域台网共6个台的宽频带数字地震记录,采用CAP法(Cut and Paste Method)反演了2008年11月22日湖北-秭归Ms4.1级地震和09月27日Ms3.2中小震的震源机制解。结果显示,2次地震的震源机制解有一些差别,但是均为逆冲兼走滑分量性质断层,主压应力P轴主要集中在NE向,与区域主压应力方向有一定一致性。分析认为秭归地震可能是仙女山断裂受库水渗透和载荷变化影响引发的水库构造地震。通过与P波初动地震震源机制结果对比发现,该地震的震源机制的反演结果有较好的一致性,结果较可信。
On the basis of the records of 6 stations in Hubei regional seismic network,we obtained the focal mechanisms of the Ms 4.1 and Ms3.2 earthquakes in Zigui on Nov.22,2008 and Sep.27,2008, respectively with the Cut and Paste(CAP) method. The result shows that earthquakes have strike-slip and strike-slip fault mechanisms and the orientations of maximum compressional stresses are mainly in NE. It is certainly consistent with the orientation of the regional maximum compressional stresses .We deduce the earthquake is the reservoir induced earthquake by water permeation and dynamic changes load.The comparison shows that the focus mechanism of two events presented in this paper is consistent with that of small-moderate earthquakes determined by P-wave first-motion.
On the basis of the records of 6 stations in Hubei regional seismic network,we obtained the focal mechanisms of the Ms 4.1 and Ms3.2 earthquakes in Zigui on Nov.22,2008 and Sep.27,2008, respectively with the Cut and Paste(CAP) method. The result shows that earthquakes have strike-slip and strike-slip fault mechanisms and the orientations of maximum compressional stresses are mainly in NE. It is certainly consistent with the orientation of the regional maximum compressional stresses .We deduce the earthquake is the reservoir induced earthquake by water permeation and dynamic changes load.The comparison shows that the focus mechanism of two events presented in this paper is consistent with that of small-moderate earthquakes determined by P-wave first-motion.
引文
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[3]吴忠良,陈运泰,倪江川,等.近震源宽频带记录的地震矩张量反演[J].地震学报,1994,(2):141-152.(WU Zhong-liang,CHEN Yun-tai,NI Jiang-chuan,et a1.Moment Tensor Inversion of broadband records local-earthquake[J].Acta Seismologica Sinica.1994,(2):141-152.(in Chinese))
[4]ZHAO L S,HELMBERGER D V.Source estimation from broadband regional seismograms[J].Bull.Seis.Soc.A-mer,1994,84(1):91-104.
[5]ZHU L,HELMBERGER D V.Advancement in source es-timation techniques using broadband regional seismograms[J].Bull Seism Soc Am,1996,86:1634-1641.
[6]ZHU L,TAN Y,HELMBERGER D V.Calibration of the Tibetan Plateau using regional seismic waveforms[J].Pa-geoph,2006,163:1193-1213.
[7]TAN Y,ZHU L,HELMBERGER DV,et a1.Locating and modeling regional earthquakes with two stations[J].J Geophys.Res.,2006,111(B01):306-314.
[8]ZHU and Rivera.A note on the dynamic and static dis-placements from a point source in multilayered media[J].Geophys.J.Int.,2002,148:619-627.
[9]张爱民,李强.双差定位法在三峡库区地震定位中的应用[J].大地测量与地球动力学,2006,26(3):73-77.(ZHANG Ai-min,LI Qiang.Application of double difference location method to earthquake in Three Gorges Reservoir area[J].Journal of Geodesy and Geodynam-ics,2006,26(3):73-77.(in Chinese))
[10]张爱萍,倪四道,杨晓勇,等.2004年东乌珠穆沁旗地震震源参数研究[J].地震,2008,28(3):61-68.(ZHANG Ai-ping,NI Si-dao,YANG Xiao-yong,et al.Source parameters of2004Xilin Gol League earthquake[J].Earthquake,2008,28(3):61-68.(in Chinese))
[11]黄建平,倪四道,傅容珊,等.综合近震及远震波形反演2006文安地震(Mw5.1)的震源机制解[J].地球物理学报,2009,52(1):120-130.(HUANG Jian-ping,NI Si-dao,FU Rong-shan,et a1.Source mechanism of the2006Mw5.1Wenan Earthquake determined from a joint inversion of local and teleseismic broadband wave-form data[J].Chinese Journal of Geophysics,2009,52(1):120-130.(in Chinese))
[12]吕坚,郑勇,倪四道,等.2005年11月26日九江-瑞昌Ms5.7、Ms4.8地震的震源机制解与发震构造研究[J].地球物理学报,2008,51(1):158-164.(Lv Jian,ZHENG Yong,NI Si-dao,et al.Focal mechanisms and seismogenic structures of the Ms5.7and Ms4.8Jiu-jiang-Ruichang earthquakes of Nov.26,2005[J].Chi-nese Journal of Geophysics,2008,51(1):158-164.(in Chinese))
[13]杨福平,严尊国.湖北省秭归ML3.6地震震源特征[J].大地测量与地球动力学,2002,22(4):92-96.(YANG Fu-ping,YAN Zun-guo.Source characteristics of ML3.6earthquake in Zigui,Hubei[J].Journal of Ge-odesy and Geodynamics,2002,22(4):92-96(in Chi-nese))
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