2011年5月20日山东安丘M_L3.7地震发震断层参数测定
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摘要
在一维单侧有限移动震源模式下,根据拐角频率随方位的变化,利用相关系数法研究了2011年5月20日山东安丘ML3.7地震的发震断层面参数。结果表明,这次地震的断层面破裂方向为112.2°,与震源机制的EW向节面一致。地震马赫数v/c约为0.2695,即平均破裂速度大约为S波速度的1/4。若取横波速度为3.5km/s,则破裂长度约为0.1162km。
By considering 1D finite moving source model propagating unilaterally,the corner frequency is employed to determine the azimuth of rupture propagation direction and the parameters of fault plane of the Shandong Anqiu ML3.7 earthquake on May 20,2011,by means of correlation coefficient method.The results show that the azimuth angle of the fault plane for this event is about 112.2°,consistent with the EW nodal plane of the focal mechanism solution.The seismic Mach number v/ c is about 0.2695,which means that the average rupture velocity is about a quarter of the S-wave velocity.Given the velocity of S wave 3.5 km/s,the fault length is about 0.1162 km.
By considering 1D finite moving source model propagating unilaterally,the corner frequency is employed to determine the azimuth of rupture propagation direction and the parameters of fault plane of the Shandong Anqiu ML3.7 earthquake on May 20,2011,by means of correlation coefficient method.The results show that the azimuth angle of the fault plane for this event is about 112.2°,consistent with the EW nodal plane of the focal mechanism solution.The seismic Mach number v/ c is about 0.2695,which means that the average rupture velocity is about a quarter of the S-wave velocity.Given the velocity of S wave 3.5 km/s,the fault length is about 0.1162 km.
引文
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[12]陈学忠,王琼,刘冬英.1995年河北沙城ML4.1地震发震断层参数测定[J].地震,2005,25(2):69-74.
[13]Jiménez A,Garcia J M,Romacho M D.Simultaneous inversion of source parameters and attenuationfactor using genetic algorithms[J].Bull Seism Soc Am,2005,95(4):1 401-1 411.
[14]徐果明,周惠兰.地震学原理[M].北京:科学出版社,1982.397-400.
[15]Ben-Menhaem A.Radiation of seismic body waves from a finite moving source in the Earth[J].JGeophys Res,1962,67:345-350.
[2]Frankel A,Fletcher J,Vernon F,et al.Rupture characteristics and tomographic source imaging ofML～3earthquakes near Anza,southern California[J].J Geophys Res,1986,91:12 633-12 650.
[3]Li Y,Thurber C H.Source properties of two microearthquakes at Kilauea volcano,Hawaii[J].BullSeism Soc Am,1988,78:1 123-1 132.
[4]Li Y,Doll C,Toksoz M N.Source characterization and fault plane determinations for Mblg=1.2to4.4earthquakes in the Charlevoix seismic zone,Quebec,Canada[J].Bull Seism Soc Am,1995,85:1 604-1 621.
[5]Mori J,Hartzell S.Source inversion of the 1988Upland,California,earthquake:determination of afault plane for a small event[J]Bull Seism Soc Am,1990,80:507-518.
[6]Mori J.Fault plane determinations for small three small earthquakes along San Jacinto fault Califor-nia:search for cross faults[J].J Geophys Res,1993,98:17 711-17 722.
[7]许向彤,陈运泰,王培德.1995年7月20日怀来盆地ML=4.1地震的破裂过程[J].地震学报,1999,21(6):570-582.
[8]许向彤,陈运泰,王培德.1995年7月20日怀来盆地ML=4.1地震序列震源参数的精确测定[J].地震学报,2001,23(3):225-238.
[9]Badawy A,Abdel-Fattah A K.Source parameters and fault plane determinations of the 28th Dec.,1999Northern Cairo earthquake[J].Tectonophysics,2001,334(1-2):63-77.
[10]Abdel-Fattah A K.An approach to investigate earthquake rupture processes[J].ACTA GEOPHYS-ICA POLONICA,2003,51,3:257-269.
[11]Abdel-Fattah A K,Badawy A.Source characteristics and tectonic implications of moderate earth-quake,northeastern Cairo prefecture[J].ACTA GEOPHYSICA POLONICA,2004,52(1):29-43.
[12]陈学忠,王琼,刘冬英.1995年河北沙城ML4.1地震发震断层参数测定[J].地震,2005,25(2):69-74.
[13]Jiménez A,Garcia J M,Romacho M D.Simultaneous inversion of source parameters and attenuationfactor using genetic algorithms[J].Bull Seism Soc Am,2005,95(4):1 401-1 411.
[14]徐果明,周惠兰.地震学原理[M].北京:科学出版社,1982.397-400.
[15]Ben-Menhaem A.Radiation of seismic body waves from a finite moving source in the Earth[J].JGeophys Res,1962,67:345-350.
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