2004年东乌珠穆沁旗地震震源参数研究
|
摘要
利用波形反演方法,研究并确定了2004年3月24日发生在内蒙古东乌珠穆沁旗与西乌珠穆沁旗交界处地震的震源机制及深度。近震波形对震源机制有很好的约束,而远震体波对于震源深度分辨率很高,因此综合利用了近震和远震波形数据。对于近震宽频带波形记录,用CAP方法反演震源机制解。利用远震直达P波、pP波和sP波的到时能较好的确定震源深度。综合利用近震宽频带波形和远震体波波形记录,反演得出2004年03月24日地震为逆冲型,震级为MW5.3。其两个节面分别为:节面I的走向、倾角、滑动角分别为147°、22°、87°,节面Ⅱ的走向、倾角、滑动角分别为330°、68°、91°;震源深度为(12±2)km,是一个典型的浅源上地壳地震。与前震序列对比,节面Ⅰ是可能的发震构造。
Using waveform inversion method, we studied the focal mechanism and depth of 2004-03-24 earthquake occurred in Inner Mongolia (Latitude, Longitude ). Local waveform has better constraints on focal mechanism, while teleseismic waveform has high resolution on source depth. Both methods were employed to invert source parameters. Focal mechanism was inverted by CAP method. The inverted depth was confirmed by teleseismic P wave modeling. The earthquake is determined as a thrust event with focal planes as 330-68-91 and 147-22-87, magnitude of MW5.3 and focal depth: 12 2 km. So, the earthquake occurred in upper crust instead of 30 km at depth as reported by many other papers.
Using waveform inversion method, we studied the focal mechanism and depth of 2004-03-24 earthquake occurred in Inner Mongolia (Latitude, Longitude ). Local waveform has better constraints on focal mechanism, while teleseismic waveform has high resolution on source depth. Both methods were employed to invert source parameters. Focal mechanism was inverted by CAP method. The inverted depth was confirmed by teleseismic P wave modeling. The earthquake is determined as a thrust event with focal planes as 330-68-91 and 147-22-87, magnitude of MW5.3 and focal depth: 12 2 km. So, the earthquake occurred in upper crust instead of 30 km at depth as reported by many other papers.
引文
[1]韦生吉等,2003年8月16日赤峰地震波形研究,2007年。
[1]内蒙古自治区地震局.内蒙古自治区2003年和2004年两次5.9级地震[M].北京:地震出版社,2005.
[2]张国民,汪素云,马宏生,等.中国大陆地震震源深度及其构造含义[J].科学通报,2002,47(9):663-670.
[3]汪素云,Ni J,马宗晋.华北强震断层面解和震源深度特征[J].地球物理学报,1991,34(1):42-54.
[4]马宗晋,薛峰.中国大陆地震深度分布与“易震层”初探[J].地震科学研究,1983,3(3):43-46.
[5]傅征祥.中国大陆余震活动深度分布及其流变学机制[J].中国地震,1996,12(2):147-152.
[6]汪素云.中国大陆地震震源分布特征的初步研究[J].地震研究,1996,19(3):310-315.
[7]Mori J,Abercrombie R E.Depth dependence of earthquake frequency-magnitude distributions in California:I mplications for rupture initiation[J].Journal of Geophysical Research,1997,102(B7):15081-15090.
[8]Engdahl E R,Buland R P,van der Hilst R D.Global teleseismic earthquake location withi mproved travel ti mes and procedures for depth determination[J].Bull SeismSoc Am,1998,88(3):722-743.
[9]Fuis G S,Clayton R W,Hauksson E,et al.Fault systems of the1971San Fernando and1994Northridge earthquakes,southern California:Relocated aftershocks and seismic i mages fromLARSEⅡ[J].Geological Society of America,2003,31(2):171-174.
[10]Zhao L S,Hel mberger D V.Source esti mationfrombroadband regional seismograms[J].Bull Seism Soc Am,1994,84:91-104.
[11]Zhu L,Hel mberger D V.Advancement in Source Esti mation Techniques Using Broadband Regional Seismograms[J].Bull Seism Soc Am,1996,86:1634-1641.
[12]Tan Ying,Zhu L,Hel mberger D V,et al.Locating and modeling regional earthquakes with two stations[J].J Geophys Res,2006,11:B01306.doi:10.1029/2005JB003775.
[13]Zhu L,and Rivera L A.Anote onthe dynamic and static displacements froma point sourcein multi-layered media[J].Geophys J Int,2002,148:619-627.
[14]韦生吉,郑勇,倪四道,等.利用区域地震数据反演大陆地震对赤峰地震的研究[M].青海:中国海洋大学出版社,2007.560-572.
[15]Zhu L,Kanamo R H.Moho depth variationin southen California fromteleseismic receiver functions[J].Journal of Geophysical Reaearch,2000,105(2):2969-2980.
[16]Charles A,Langston.The February91971san Fernando earthquake:Astudy of source finiteness in teleseismic body waves[J].Bull Seism Soc Am,1978,68(1):1-29.
[17]钟以章,王辉,曲乐.赤峰地区地震地质条件的初步研究[J].东北地震研究,2006,22(1):18-25.
[18]Tullis J,Snoke A W,Todd V R.Significance and petrogenesis of mylonite records[J].Geology,1982,10:227-230.
[19]Yang Xiao-Yong,Liu Deliang,Wagner G A.Conditions of deformation and variations of composi-tional and structural state of feldspars during mylonitizaton:exemplified fromthe ductile shear zones in south Tanlu fault belt of China[J].Neues Jahrbuch fr Mineralogie(Monatshefte),2001,H(9-10):415-432.
[20]Ramsay J G,Wood D S.The geometric effects of volume change during deformation process[J].Tectonophysics,1973,16:263-277.
[1]内蒙古自治区地震局.内蒙古自治区2003年和2004年两次5.9级地震[M].北京:地震出版社,2005.
[2]张国民,汪素云,马宏生,等.中国大陆地震震源深度及其构造含义[J].科学通报,2002,47(9):663-670.
[3]汪素云,Ni J,马宗晋.华北强震断层面解和震源深度特征[J].地球物理学报,1991,34(1):42-54.
[4]马宗晋,薛峰.中国大陆地震深度分布与“易震层”初探[J].地震科学研究,1983,3(3):43-46.
[5]傅征祥.中国大陆余震活动深度分布及其流变学机制[J].中国地震,1996,12(2):147-152.
[6]汪素云.中国大陆地震震源分布特征的初步研究[J].地震研究,1996,19(3):310-315.
[7]Mori J,Abercrombie R E.Depth dependence of earthquake frequency-magnitude distributions in California:I mplications for rupture initiation[J].Journal of Geophysical Research,1997,102(B7):15081-15090.
[8]Engdahl E R,Buland R P,van der Hilst R D.Global teleseismic earthquake location withi mproved travel ti mes and procedures for depth determination[J].Bull SeismSoc Am,1998,88(3):722-743.
[9]Fuis G S,Clayton R W,Hauksson E,et al.Fault systems of the1971San Fernando and1994Northridge earthquakes,southern California:Relocated aftershocks and seismic i mages fromLARSEⅡ[J].Geological Society of America,2003,31(2):171-174.
[10]Zhao L S,Hel mberger D V.Source esti mationfrombroadband regional seismograms[J].Bull Seism Soc Am,1994,84:91-104.
[11]Zhu L,Hel mberger D V.Advancement in Source Esti mation Techniques Using Broadband Regional Seismograms[J].Bull Seism Soc Am,1996,86:1634-1641.
[12]Tan Ying,Zhu L,Hel mberger D V,et al.Locating and modeling regional earthquakes with two stations[J].J Geophys Res,2006,11:B01306.doi:10.1029/2005JB003775.
[13]Zhu L,and Rivera L A.Anote onthe dynamic and static displacements froma point sourcein multi-layered media[J].Geophys J Int,2002,148:619-627.
[14]韦生吉,郑勇,倪四道,等.利用区域地震数据反演大陆地震对赤峰地震的研究[M].青海:中国海洋大学出版社,2007.560-572.
[15]Zhu L,Kanamo R H.Moho depth variationin southen California fromteleseismic receiver functions[J].Journal of Geophysical Reaearch,2000,105(2):2969-2980.
[16]Charles A,Langston.The February91971san Fernando earthquake:Astudy of source finiteness in teleseismic body waves[J].Bull Seism Soc Am,1978,68(1):1-29.
[17]钟以章,王辉,曲乐.赤峰地区地震地质条件的初步研究[J].东北地震研究,2006,22(1):18-25.
[18]Tullis J,Snoke A W,Todd V R.Significance and petrogenesis of mylonite records[J].Geology,1982,10:227-230.
[19]Yang Xiao-Yong,Liu Deliang,Wagner G A.Conditions of deformation and variations of composi-tional and structural state of feldspars during mylonitizaton:exemplified fromthe ductile shear zones in south Tanlu fault belt of China[J].Neues Jahrbuch fr Mineralogie(Monatshefte),2001,H(9-10):415-432.
[20]Ramsay J G,Wood D S.The geometric effects of volume change during deformation process[J].Tectonophysics,1973,16:263-277.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心