抚松M_L5.0级地震断层破裂参数的测定
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摘要
本文根据地震波传播过程中的多谱勒效应,利用拐角频率的方位变化,用最小二乘法反演了抚松ML5.0级地震的破裂参数。结果表明,这次地震的断层破裂方向为226°,与震源机制解WS向节面、余震分布和震中附近的断层走向基本一致。地震马赫数为0.62,破裂长度为2.82km,破裂自北东向西南方向传播。
In this paper,the azimuths of rupture propagation directions and source parameters of the ML5.0 earthquakes in Fusong are obtained utilizing the direction change of corner frequency and the least square method according to the earthquake Doppler effect.The results show that the azimuth angle of rupture propagation directions is about 226°,consistent with the WS nodal plane of focal mechanism and aftershock distribution and the fault directions in the epicenters.The seismic Mach number is about 0.62 and the rupture lengths are about 2.82 kilometers.The rupture propagate along the direction from NE to SW.
In this paper,the azimuths of rupture propagation directions and source parameters of the ML5.0 earthquakes in Fusong are obtained utilizing the direction change of corner frequency and the least square method according to the earthquake Doppler effect.The results show that the azimuth angle of rupture propagation directions is about 226°,consistent with the WS nodal plane of focal mechanism and aftershock distribution and the fault directions in the epicenters.The seismic Mach number is about 0.62 and the rupture lengths are about 2.82 kilometers.The rupture propagate along the direction from NE to SW.
引文
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[15]高金哲,刘杰等.长白山天池火山地区尾波Q值估计[J].中国地震,2007,23(4):400～408.
[16]段永红,等.长白山天池火山基底结构的研究[J].地震地质,2003,25(3):501-508.
[17]梁国经等.靖宇、抚松Ms4.6级地震序列特征[J].防灾减灾学报,2010,26(1):67～74.
[18]郭增建,秦宝燕.震源物理[M].北京:地震出版社,1979.104～158.
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[2]Frankel A,Fletcher J,Vernon F,et al.Rupture chara-cteristics and tomographic source imaging of ML3earthquakes near Anza,southern Caliifornia[J].J Geophys Res,1986,91:12633-12650.
[3]Li Y,Doll C,Toksoz M N.Source characterization and faultplane determinations for Mbig=1.2 to 4.4 earthquakes in the Charlevoix seismic zone,Quebec,Canada[J].Bull SeismSoc Am,1995,85:1604-1621.
[4]Badawy A,Abdel-Fattah A K.Source parameters and faultplane determinations of the 28th Dec.,1999 Northern Cairoearthquake[J].Tectonophysics,2001,334(1-2):63-77.
[5]Abdel-Fattah A K.An approach to investigate earthquakerupture processes[J].Acta Geophysica Polonica,2003,51(3):257-269.
[6]Abdel-Fattah A K,Badawy A.Source characteristics andtectonic implications of moderate earthquake,northeastern Cairo prefecture[J].Acta Geophysica Polonica,2004,52(1):29-43.
[7]陈学忠等.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.
[8]徐果明,周惠兰.地震学原理[M].北京:科学出版社,1982.397-400.
[9]Ben-Menhaem A.Radiation of seismic body waves from afinite moving source in the Earth[J].J Geophys Res,1962,67:345-350.
[10]Chael E.Spectral scaling of earthquakes in the Miramichi re-gion of New Brunswick[J].BSSA,1987,77:347～365.
[11]Aaron M.,Jorge A.,Kojiro.Inversion of Source Parametersand Site Efects from Strong Ground Motion Records using Genetic Algofithmss[J].BSSA,2000,94:977～992.
[12]Matsunmni K,Nakamura M.Seismic attenuation in a non-volcanic swagln region beneath Wakayama,southwest Japan[J].JGR,2004,109(B9):B09302.
[13]Rautian T G,Khalturin V I.1978,The use ofthe cod afordetermination of earthqu-ake source spectrum[J].BSSA,1987,611:923～948.
[14]Aki K.Attenuation of shear-waves in the lithosphere for fre-quencies from 0.05 to 25Hz[J].Phys.Earth Plant Interiors,1980,21:50～6
[15]高金哲,刘杰等.长白山天池火山地区尾波Q值估计[J].中国地震,2007,23(4):400～408.
[16]段永红,等.长白山天池火山基底结构的研究[J].地震地质,2003,25(3):501-508.
[17]梁国经等.靖宇、抚松Ms4.6级地震序列特征[J].防灾减灾学报,2010,26(1):67～74.
[18]郭增建,秦宝燕.震源物理[M].北京:地震出版社,1979.104～158.
[19]龙锋,闻学泽等.华北地区地震活断层震级—破裂长度、破裂面积的经验关系[J].地震地质,2006,28(4):511～535.
[20]阮祥,程万正.云南鲁甸3次MS≥5.0地震破裂参数的研究[J].地震学报,2008,30(1):97～102.
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