用CAP方法研究安庆4.8级地震震源机制
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摘要
利用CAP方法反演了2011年1月19日安庆MS 4.8地震震源机制解。反演得到震级MW=4.1,节面I走向角16°、倾角74°、滑移角120°;节面II走向131°,倾角33°,滑移角30°;震源深度为3km。两个节面的走向与震中附近的宿松-枞阳断裂的走向相差较大,加之前人的地质考察结果显示,该断裂晚第四纪以来地震活动性较弱,故认为宿松-枞阳断裂是安庆MS 4.8地震发震构造的可能性较小,本次地震很可能是北北东向的隐伏断层活动的结果。
In this article,we have inverted local broadband waveform data to determine the foca1 mechanism of 2011 Anqing MS4.8 earthquake.Our result shows that the best double couple solution of the MS4.8 event is 16°,74° and 120° for strike,dip and rake angles respectively.The other nodal plane is 131°,33°,30°;the estimated focal depth is about 3km.The both strikes of the two nodal plane are significantly different with the strike of the Susong-Zongyang fault,which has a low level of seismic activity since Late Quaternary.This implies that this earthquake may not occur on the Susong-Zongyang fault,and we infer that a buried fault with strike of NNE may be the seismogenic structure of this event.
In this article,we have inverted local broadband waveform data to determine the foca1 mechanism of 2011 Anqing MS4.8 earthquake.Our result shows that the best double couple solution of the MS4.8 event is 16°,74° and 120° for strike,dip and rake angles respectively.The other nodal plane is 131°,33°,30°;the estimated focal depth is about 3km.The both strikes of the two nodal plane are significantly different with the strike of the Susong-Zongyang fault,which has a low level of seismic activity since Late Quaternary.This implies that this earthquake may not occur on the Susong-Zongyang fault,and we infer that a buried fault with strike of NNE may be the seismogenic structure of this event.
引文
陈安国、倪红玉、刘东旺等,2011,2011年1月安徽安庆MS4.8地震震源区三维速度结构与发震构造讨论,中国地震,待发表。
邓起东、卢造勋、杨主恩,城市活断层探测和断层活动性评价问题,地震地质,29(2),189～200。
黄建平、倪四道、傅容珊等,2009,综合近震及远震波形反演2006文安地震(MW5.1)的震源机制解,地球物理学报,52(1),120～130。
李华、王良书、李成等,2008,大别造山带西段宽频带数字地震台阵观测与地壳上地幔结构,地球科学,38(7),862～871。
刘东旺、刘泽民、沈小七等,2009,汶川8.0级地震后郯庐断裂带中南段地震危险性研究,国际地震动态,(4),85～85。
吕坚、郑勇、倪四道等,2008,2005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,地球物理学报,51(1),158～164。
史大年、姜枚、彭聪等,1999,大别造山带东部地壳结构的层析成像及广角反射的地震学研究,地震学报,21(4),403～410。
徐纪人、杨文采、赵志新等,2003,苏鲁大别造山带岩石圈三维P波速度结构特征,地质学报,77(4),577～582。
姚大全、汤有标、刘加灿等,1997,安徽西南宿松-枞阳断裂中段活动性的综合评价,地震地质,3(11),295～300。
翟洪涛、郑颖平、李光等,2010,宿松-枞阳断裂最新活动时代及未来地震危险性研究,防震减灾工程学报,30(5),567～571。
翟洪涛、邓志辉、周本刚等,2009,1585年安徽巢县南地震核查与发震构造讨论,地震地质,31(2),295～304。
张辉、徐辉、姚军等,2010,祁连山中东段基于CAP方法的中小地震震源机制研究,山西地震,(1),25～29。
赵凌云、邓津、陈俊华等,2010,基于CAP方法的震源机制研究,长江科学院院报,27(5),81～84。
Du W X,Kim W Y,Sykes L R,2003,Earthquake source parameters and state of stress for the northeastern united states andsoutheastern Canada from analysis of regional seismograms.Bul1Seism Soc Am,93(4),1633～l648.
Doser D I,1988,Ource parameters of earthquakes in the Nevada seismic zone,1915～1943,J Geophys Res,93(B12),1500l～15015.
Dreger D S,Helmberger D V,1990,Broadband modeling of local earthquakes,Bul1Seis Soc Am,80,62～1179.
Dreger D S,Tkalcic H,Johnston M,2000,Dilational processes accompanying earthquakes in the Long Valley Caldera,Scienc,288,l22～125.
Dreger D S,Helmherger D V,1993,Determination of source parameters at regional distances with three-component sparsenetwork data,J Geophys Res,98,8107～8125.
Helmberger D V,Engen G R,1980,Modeling the long-period body waves from shallow earthquakes at regional ranges,Bul1SeismSoc Am,70,1699～1714.
Ichinose G A,Smith K D,Anderson J G,1997,Source parameters of the15November Border Town,Nevada,earthquake sequence,Bul1Seism Soc Am,87,652～667.
Ichinose G A,Smith K D,Anderson J G,1998,Moment tensor inversion of the1994to1996Double Spring Flat,Nevada,earthquake sequence and implications for local tectonics models,Bul1Seism Soc Am,88,1363～1378.
Ichinose G A,Smith K D,Anderson J G,1999,Seismic analysis of the7January1998chemical plant explosion at Kean Canyon,Nevada,Bul1Seism Soc Am,89,938～945.
Pasyanos M E,Dreger D S,Romanowicz B,1996,Toward realtime estim ation of regional moment tensors,Bul1Seism Soc Am,86,1255～1269.
Ritsema J,Lay T,l995,Long period regional wave moment tensor inversion for earthquakes in the western United States,J GeophysRes,100,9853～9864.
Saikia C K,2006,Modeling of the21May1997Jabalpur earthquake in central India:source parameters and regional pathcalibration.Bul1Seism Sac Am,96(4),1396～1421.
Thio H K,Kanamori H,1995,Moment-tensor inversion for local earthquakes using surface waves recorded at TERRAscope,Bul1Seism Soc Am,85,1021～1038.
Wallace T C,1981,A technique for the inversion of regional data in source parameter studies,J Geophys Res,86,679～1685.
Wallace T C,Helmberger D V,1982,Determining source parameters of moderate-size earthquakes from regional waveforms,PhysEarth Planet Interiors,30,185～196
Walter W R,1993,Source parameters of the June29,1992Little Skull Mountain earthquake from complete regional waveform sat asingle station,Geophys Res Lett,20,403～406.
Zhao L S,Helmberger D V,1994,Source estimation from broadband regional seismograms,Bull Seis Soc Amer,84(1),91～104.
Zheng Y,Ma H S,Lv J,et al,2009,Source mechanism of strong aftershocks(MS≥5.6)of the2008/05/12Wenchuanearthquake and the implication for seismotectonics,Science in China(Series D:Earth Sciences),52(6),739～753.
Zheng Y,Ni S D,Xie Z J,et al,2010,Strong aftershocks in the northern segment of the Wenchuan earthquake rupture zone andtheir seismotectonic implications,Earth Planets Space,62(11),881～886.
Zhu L P,Helmberger D V,1996,Advancement in source estimation techniques using broadband regional seismograms,Bull SeisSoc Amer,86(5),1634～1641.
Zhu L P,Rivera L A,2002,A note on the dynamic and static displacements from a point source in multilayered media,Geophys JInt,148,619～627.
邓起东、卢造勋、杨主恩,城市活断层探测和断层活动性评价问题,地震地质,29(2),189～200。
黄建平、倪四道、傅容珊等,2009,综合近震及远震波形反演2006文安地震(MW5.1)的震源机制解,地球物理学报,52(1),120～130。
李华、王良书、李成等,2008,大别造山带西段宽频带数字地震台阵观测与地壳上地幔结构,地球科学,38(7),862～871。
刘东旺、刘泽民、沈小七等,2009,汶川8.0级地震后郯庐断裂带中南段地震危险性研究,国际地震动态,(4),85～85。
吕坚、郑勇、倪四道等,2008,2005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,地球物理学报,51(1),158～164。
史大年、姜枚、彭聪等,1999,大别造山带东部地壳结构的层析成像及广角反射的地震学研究,地震学报,21(4),403～410。
徐纪人、杨文采、赵志新等,2003,苏鲁大别造山带岩石圈三维P波速度结构特征,地质学报,77(4),577～582。
姚大全、汤有标、刘加灿等,1997,安徽西南宿松-枞阳断裂中段活动性的综合评价,地震地质,3(11),295～300。
翟洪涛、郑颖平、李光等,2010,宿松-枞阳断裂最新活动时代及未来地震危险性研究,防震减灾工程学报,30(5),567～571。
翟洪涛、邓志辉、周本刚等,2009,1585年安徽巢县南地震核查与发震构造讨论,地震地质,31(2),295～304。
张辉、徐辉、姚军等,2010,祁连山中东段基于CAP方法的中小地震震源机制研究,山西地震,(1),25～29。
赵凌云、邓津、陈俊华等,2010,基于CAP方法的震源机制研究,长江科学院院报,27(5),81～84。
Du W X,Kim W Y,Sykes L R,2003,Earthquake source parameters and state of stress for the northeastern united states andsoutheastern Canada from analysis of regional seismograms.Bul1Seism Soc Am,93(4),1633～l648.
Doser D I,1988,Ource parameters of earthquakes in the Nevada seismic zone,1915～1943,J Geophys Res,93(B12),1500l～15015.
Dreger D S,Helmberger D V,1990,Broadband modeling of local earthquakes,Bul1Seis Soc Am,80,62～1179.
Dreger D S,Tkalcic H,Johnston M,2000,Dilational processes accompanying earthquakes in the Long Valley Caldera,Scienc,288,l22～125.
Dreger D S,Helmherger D V,1993,Determination of source parameters at regional distances with three-component sparsenetwork data,J Geophys Res,98,8107～8125.
Helmberger D V,Engen G R,1980,Modeling the long-period body waves from shallow earthquakes at regional ranges,Bul1SeismSoc Am,70,1699～1714.
Ichinose G A,Smith K D,Anderson J G,1997,Source parameters of the15November Border Town,Nevada,earthquake sequence,Bul1Seism Soc Am,87,652～667.
Ichinose G A,Smith K D,Anderson J G,1998,Moment tensor inversion of the1994to1996Double Spring Flat,Nevada,earthquake sequence and implications for local tectonics models,Bul1Seism Soc Am,88,1363～1378.
Ichinose G A,Smith K D,Anderson J G,1999,Seismic analysis of the7January1998chemical plant explosion at Kean Canyon,Nevada,Bul1Seism Soc Am,89,938～945.
Pasyanos M E,Dreger D S,Romanowicz B,1996,Toward realtime estim ation of regional moment tensors,Bul1Seism Soc Am,86,1255～1269.
Ritsema J,Lay T,l995,Long period regional wave moment tensor inversion for earthquakes in the western United States,J GeophysRes,100,9853～9864.
Saikia C K,2006,Modeling of the21May1997Jabalpur earthquake in central India:source parameters and regional pathcalibration.Bul1Seism Sac Am,96(4),1396～1421.
Thio H K,Kanamori H,1995,Moment-tensor inversion for local earthquakes using surface waves recorded at TERRAscope,Bul1Seism Soc Am,85,1021～1038.
Wallace T C,1981,A technique for the inversion of regional data in source parameter studies,J Geophys Res,86,679～1685.
Wallace T C,Helmberger D V,1982,Determining source parameters of moderate-size earthquakes from regional waveforms,PhysEarth Planet Interiors,30,185～196
Walter W R,1993,Source parameters of the June29,1992Little Skull Mountain earthquake from complete regional waveform sat asingle station,Geophys Res Lett,20,403～406.
Zhao L S,Helmberger D V,1994,Source estimation from broadband regional seismograms,Bull Seis Soc Amer,84(1),91～104.
Zheng Y,Ma H S,Lv J,et al,2009,Source mechanism of strong aftershocks(MS≥5.6)of the2008/05/12Wenchuanearthquake and the implication for seismotectonics,Science in China(Series D:Earth Sciences),52(6),739～753.
Zheng Y,Ni S D,Xie Z J,et al,2010,Strong aftershocks in the northern segment of the Wenchuan earthquake rupture zone andtheir seismotectonic implications,Earth Planets Space,62(11),881～886.
Zhu L P,Helmberger D V,1996,Advancement in source estimation techniques using broadband regional seismograms,Bull SeisSoc Amer,86(5),1634～1641.
Zhu L P,Rivera L A,2002,A note on the dynamic and static displacements from a point source in multilayered media,Geophys JInt,148,619～627.
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