2010年10月24日周口太康M_s4.6地震的震源机制解
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摘要
利用河南省区域地震台网的近震波形资料,采用近震时间域方法,反演2010年10月24日16点58分太康M_S4.6地震的地震矩张量,结果显示,该地震为走滑型地震。结合震后灾害考察,认为太康地震发生在周口-太康断裂上。
On October 24,2010,a magnitude M_s 4.6 earthquake occurred in the region of Taikang in Henan Province.To understand the seism tectonics of this event,we try to relocate it and further study its focal mechanism based on the local broadband waveform data of available stations in Henan Province regional seismic networks.The focal mechanism solution was determined by the TDMT-INVC method.The results indicate that the Taikang earthquake is a strike-slip event.According to the epicenter and the focal mechanism,Taikang earthquake occurred on the Zhoukou-Taikang tault.
On October 24,2010,a magnitude M_s 4.6 earthquake occurred in the region of Taikang in Henan Province.To understand the seism tectonics of this event,we try to relocate it and further study its focal mechanism based on the local broadband waveform data of available stations in Henan Province regional seismic networks.The focal mechanism solution was determined by the TDMT-INVC method.The results indicate that the Taikang earthquake is a strike-slip event.According to the epicenter and the focal mechanism,Taikang earthquake occurred on the Zhoukou-Taikang tault.
引文
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Zhao L S,Helmberger D V.Source retrieval from broad-band regional seismograms Hindu-Kush region[J].Physics of the Earth and Planetary Interiors,1993,78(1—2):69-95.
Zhao L S,Helmberger D V.Source estimation from broad-band regional seismograms[J].Bulletin of the Seismological Society of America,1994,84(1),91-104.
韩立波,蒋长胜,包丰.2010年河南太康M_S 4.6地震序列震源参数的精确确定[J].地球物理学报,2012,55(9):2 973—2 981.
胡幸平,俞春泉,陶开,等.利用P波初动资料求解汶川地震及其强余震震源机制解[J].地球物理学报,2008,51(6):1 711—1 718.
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—257.
孙武城,马宝林,宋松岩.湖北随州至内蒙古喀喇沁旗地学断面1:100万说明书[M].北京:地震出版社,1992.
许忠淮,阎明,赵仲和.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(3):268—279.
赵翠萍,陈章立,郑斯华,等.伽师震源区中等强度地震矩张量反演及其应力场特征[J].地球物理学报,2008,51(3):782—792.
郑建常,陈运泰.基于Langston分解和Hilbert变换约束的区域偏量矩张量反演方法及其应用[J].地震学报,2012,34(2):1 71-190.
Dreger D S,Helmberger D V.Determination of source parameters at regional distances with three-components sparse network data[J],Journal of Geophysical Research,1993,98:8 107—8 125.
Dreger D,Helmberger D V.Broad-band modeling of local earthquakes[J].Bulletin of the Seismological Society of America,1990,80(5):1 162-1 179.
Dreger D,Helmberger D.Source parameters of the Siena-Madre earthquake from regional and local body waves[J].Geophysical Research Letters,1991,18(11):2 015-2 018.
Dreger D.TDMT_INV:time domain seismic moment tensor in version[J].international Handbook of Earthquake and Engineering Seismology,2003,81B:1 627.
Herrmann R B,Wang C Y.A comparison of synthetic seismograms[J].Bulletin of Seismology Society America,1985,75:41-56.
Romanowicz B,Dreger B D,Pasyanos M et al.Monitoring of strain release in central and northern California using broadband data[J].Geophysical Research Letters,1993,20:1 643—1 646.
Wang C Y.Herrmann R B.A numerical study of P,SV,SH-wave generation in a plane layered medium[J].Bulletin of Seismology Society America,1980,70.1 015—1 036.
Zhao L S,Helmberger D V.Source retrieval from broad-band regional seismograms Hindu-Kush region[J].Physics of the Earth and Planetary Interiors,1993,78(1—2):69-95.
Zhao L S,Helmberger D V.Source estimation from broad-band regional seismograms[J].Bulletin of the Seismological Society of America,1994,84(1),91-104.
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