2003年内蒙古巴林左旗M_S5.9地震发震构造
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摘要
2003年8月16日内蒙古巴林左旗MS5.9地震在大兴安岭地区显得较为突出,为该区有记载以来的最高震级地震,突破了以往我们对这一地区地震构造背景的认识。地震发生后,相关考察报告与研究文献对于其发震构造的认识存在分歧。本项研究基于对该地震相关的地震学资料的收集,结合震区及邻区的航卫片判读,通过野外地质地貌调查,发现了NW向水泉子沟-天山口断裂的存在。初步认定该断裂长度为60km,其中,该断裂西北段即水泉子沟-西山湾段的活动时代相对较新,断错地层年代为距今498±49ka,断层泥ESR样品的测试年龄为距今325±32ka。综合此次地震的震源机制解、震害分布特征以及余震序列等研究结果,推断水泉子沟-西山湾段为该地震的发震断裂。
The determination of seismogenic structure is of great importance in seismic hazard analysis (SHA) whereas the identification of seimogenic structure of moderate earthquake is quite challenging. It's absolutely well-marked that the 2003 Bailinzuoqi M_S5.9 earthquake occurred because of the low seismicity of the whole Dahingganling Uplift. The penetrating research of seismogenic conditions in which "2003 event" took place can make sense to the understanding of seimogenic structure of Dahingganling Uplift. According to the tough field investigation that last more than two months in the target area, we find the Shuiquanzigou-Tianshankou fault that caused the 2003 earthquake reveals the distribution of this fault and the latest active information, that is, the Shuiquanzigou-Xishanwan-Tianshankou fault consists of Shuiquanzigou-Xishanwan section which cuts the statum of Mid-Pleistocene, being active in Mid-Pleistocene derived from ESR dating of fault clay and Yangshulin-Tianshankou section based on the materials collection of geophysics and seismology related to this event and the interpretation of remote sensing images. Finally, the authors consider the section of Shuiquanzigou-Xishanwan as the seismogenic fault based on the synthetical analysis of the focal mechanism, the distribution of the seismic damage and aftershocks.
The determination of seismogenic structure is of great importance in seismic hazard analysis (SHA) whereas the identification of seimogenic structure of moderate earthquake is quite challenging. It's absolutely well-marked that the 2003 Bailinzuoqi M_S5.9 earthquake occurred because of the low seismicity of the whole Dahingganling Uplift. The penetrating research of seismogenic conditions in which "2003 event" took place can make sense to the understanding of seimogenic structure of Dahingganling Uplift. According to the tough field investigation that last more than two months in the target area, we find the Shuiquanzigou-Tianshankou fault that caused the 2003 earthquake reveals the distribution of this fault and the latest active information, that is, the Shuiquanzigou-Xishanwan-Tianshankou fault consists of Shuiquanzigou-Xishanwan section which cuts the statum of Mid-Pleistocene, being active in Mid-Pleistocene derived from ESR dating of fault clay and Yangshulin-Tianshankou section based on the materials collection of geophysics and seismology related to this event and the interpretation of remote sensing images. Finally, the authors consider the section of Shuiquanzigou-Xishanwan as the seismogenic fault based on the synthetical analysis of the focal mechanism, the distribution of the seismic damage and aftershocks.
引文
①薛丁,2003,8月16日巴林左旗、阿鲁科尔沁旗间5·9级地震构造背景,震情研究(中国地震局编,内部刊物)。
②中国地震局地震预测研究所等,2005,内蒙古白音华金山发电厂地震安全性评价报告。
③中国地震局地质研究所,2002,中俄原油管道工程场地地震安全性评价报告。
安艳芬、韩竹军,2006,解读发震构造含义与判定原则,震灾防御技术,1(3),261~265。
邓起东主编,2007,中国活动构造图,北京:地震出版社。
高孟潭、许力生、郭文生等,2005,2003年8月16日内蒙古MS5·9地震震害分布特征及其成因分析,地震学报,27(2),205~212。
国家核安全局、国家地震局,1994,核电厂址选择中的地震问题(HAF0101(1)),北京:法制出版社。
刘芳、曹井泉,2004a,巴林左旗-阿鲁科尔沁旗5·9级地震余震序列精确定位及分布特征,东北地震研究,20(4),22~27。
刘芳、薛丁、曹井泉等,2004b,2003年8月16日巴林左旗与阿鲁科尔沁旗间MS5·9级地震参数及序列特征,华北地震科学,22(3),44~46。
卢寿德主编,2006,GB17741-2005《工程场地地震安全性评价》宣贯教材,北京:中国标准出版社。
内蒙古自治区地震局,2005,内蒙古自治区2003年和2004年两次5·9级地震,北京:地震出版社。
王新岭、张国民、马宏生等,2004,用PTD方法测定巴林左旗5·9级地震震源深度,地震,24(4),51~56。
徐杰、马宗晋、陈国光等,2003,中国大陆东部新构造期北西向断裂带的初步探讨,地学前缘,10(特刊),193~198。
徐锡伟、冉勇康、周本刚等,1998,张北-尚义地震的地震构造环境与宏观破坏特征,地震地质,20(2),135~145。
许力生、陈运泰,1997,用数字化宽频带波形资料反演共和地震的震源参数,地震学报,19(2),113~128。
鄢家全、金严、张裕明等,2006,论概率法与构造法之同源协调性,国际地震动态,第3期,1~4。
张洪由,2003,2003年8月16日内蒙古5·9级地震综述,国际地震动态,297(9),12~14。
张裕明、周本刚、沈得秀,2006,工程场地地震安全性评价中的两个问题的讨论,震灾防御技术,1(3),181~185。
中国科学院内蒙宁夏综合考察队,1980,内蒙古自治区及东北西部地区地貌,北京:科学出版社,1~32。
钟以章、王辉、曲乐,2006,赤峰地区地震地质条件的初步研究,东北地震研究,22(1),18~25。
周本刚,1989,松辽盆地和邻区地震构造特征及其地球动力学模式,北京:中国地震局地质研究所硕士学位论文。
周本刚、沈得秀,2006,地震安全性评价中若干地震地质问题讨论,震灾防御技术,1(2),113~120。
G-Akis Tselentis,Efthimios Sokos,Nikos Martakis,et al,2006,Seismicity and Seismotectonicsin Epirus,Western Greece:Resultsfroma Microearthquake Survey,Bulletin of the Seismological Society of America,96(5),1706~1717.
J.R.Kayal,S.G.Gaonkar,G.K.Chakraborty,et al,2004,Aftershocks and Seismotectonic Implications of the13September2002Earthquake(MW6·5)inthe Andaman Sea Basin,Bulletin of the Seismological Society of America,94(1),326~333.
J.R.Kayal,Sagina Ram,O.P.Singh,et al,2003,Aftershocks of the March1999Chamoli Earthquake and Seismotectonic Structure ofthe Garhwal Himalaya,Bulletin of the Seismological Society of America,93(1),109~117.
Lay Tand Wallace TC,1995,Modern Global Seismology,San Diego:Academic Press,1~521.
Michael C.Stickney and David R.Lageson,2002,Seismotectonics of the20August1999Red Rock Valley,Montana,Earthquake,Bulletin of the Seismological Society of America,92(6),2449~2464.
Natalia A.Ratchkovski,Stefan Wiemer and Roger A.Hansen,2004,Seismotectonics of the Central Denali Fault,Alaska,andthe2002Denali Fault Earthquake Sequence,Bulletin of the Seismological Society of America,94(6B),S156~S174.
O.P.Mishra,J.R.Kayal,G.K.Chakrabortty,et al,2007,Aftershock Investigation in the Andaman-Nicobar Islands of India and ItsSeismotectonic Implications,Bulletin of the Seismological Society of America,97(1A),S71~S85.
Reena De,J.R.Kayal.2003·Seismotectonic Model of the SikkimHimalaya:Constraint from Microearthquake Surveys,Bulletin of theSeismological Society of America,93(3):1395~1400.
S.Dineva,D.Eaton,S.Ma,R.Mereu.2007·The October2005Georgian Bay,Canada,Earthquake Sequence:Mafic Dykes andTheir Role inthe Mechanical Heterogeneity of Precambrian Crust,Bulletin of the Seismological Society of America,97(2):457~473.
Serva L.,1993·An analysis of the world major regulatory guides for nuclear plant seismic design,Energia Nucleare,10(2):77~96.
Steven N.Ward.1994·A multidisciplinary approach to seismic hazard in southern California,Bulletin of the Seismological Society ofAmerica,84(5):1293~1309.
②中国地震局地震预测研究所等,2005,内蒙古白音华金山发电厂地震安全性评价报告。
③中国地震局地质研究所,2002,中俄原油管道工程场地地震安全性评价报告。
安艳芬、韩竹军,2006,解读发震构造含义与判定原则,震灾防御技术,1(3),261~265。
邓起东主编,2007,中国活动构造图,北京:地震出版社。
高孟潭、许力生、郭文生等,2005,2003年8月16日内蒙古MS5·9地震震害分布特征及其成因分析,地震学报,27(2),205~212。
国家核安全局、国家地震局,1994,核电厂址选择中的地震问题(HAF0101(1)),北京:法制出版社。
刘芳、曹井泉,2004a,巴林左旗-阿鲁科尔沁旗5·9级地震余震序列精确定位及分布特征,东北地震研究,20(4),22~27。
刘芳、薛丁、曹井泉等,2004b,2003年8月16日巴林左旗与阿鲁科尔沁旗间MS5·9级地震参数及序列特征,华北地震科学,22(3),44~46。
卢寿德主编,2006,GB17741-2005《工程场地地震安全性评价》宣贯教材,北京:中国标准出版社。
内蒙古自治区地震局,2005,内蒙古自治区2003年和2004年两次5·9级地震,北京:地震出版社。
王新岭、张国民、马宏生等,2004,用PTD方法测定巴林左旗5·9级地震震源深度,地震,24(4),51~56。
徐杰、马宗晋、陈国光等,2003,中国大陆东部新构造期北西向断裂带的初步探讨,地学前缘,10(特刊),193~198。
徐锡伟、冉勇康、周本刚等,1998,张北-尚义地震的地震构造环境与宏观破坏特征,地震地质,20(2),135~145。
许力生、陈运泰,1997,用数字化宽频带波形资料反演共和地震的震源参数,地震学报,19(2),113~128。
鄢家全、金严、张裕明等,2006,论概率法与构造法之同源协调性,国际地震动态,第3期,1~4。
张洪由,2003,2003年8月16日内蒙古5·9级地震综述,国际地震动态,297(9),12~14。
张裕明、周本刚、沈得秀,2006,工程场地地震安全性评价中的两个问题的讨论,震灾防御技术,1(3),181~185。
中国科学院内蒙宁夏综合考察队,1980,内蒙古自治区及东北西部地区地貌,北京:科学出版社,1~32。
钟以章、王辉、曲乐,2006,赤峰地区地震地质条件的初步研究,东北地震研究,22(1),18~25。
周本刚,1989,松辽盆地和邻区地震构造特征及其地球动力学模式,北京:中国地震局地质研究所硕士学位论文。
周本刚、沈得秀,2006,地震安全性评价中若干地震地质问题讨论,震灾防御技术,1(2),113~120。
G-Akis Tselentis,Efthimios Sokos,Nikos Martakis,et al,2006,Seismicity and Seismotectonicsin Epirus,Western Greece:Resultsfroma Microearthquake Survey,Bulletin of the Seismological Society of America,96(5),1706~1717.
J.R.Kayal,S.G.Gaonkar,G.K.Chakraborty,et al,2004,Aftershocks and Seismotectonic Implications of the13September2002Earthquake(MW6·5)inthe Andaman Sea Basin,Bulletin of the Seismological Society of America,94(1),326~333.
J.R.Kayal,Sagina Ram,O.P.Singh,et al,2003,Aftershocks of the March1999Chamoli Earthquake and Seismotectonic Structure ofthe Garhwal Himalaya,Bulletin of the Seismological Society of America,93(1),109~117.
Lay Tand Wallace TC,1995,Modern Global Seismology,San Diego:Academic Press,1~521.
Michael C.Stickney and David R.Lageson,2002,Seismotectonics of the20August1999Red Rock Valley,Montana,Earthquake,Bulletin of the Seismological Society of America,92(6),2449~2464.
Natalia A.Ratchkovski,Stefan Wiemer and Roger A.Hansen,2004,Seismotectonics of the Central Denali Fault,Alaska,andthe2002Denali Fault Earthquake Sequence,Bulletin of the Seismological Society of America,94(6B),S156~S174.
O.P.Mishra,J.R.Kayal,G.K.Chakrabortty,et al,2007,Aftershock Investigation in the Andaman-Nicobar Islands of India and ItsSeismotectonic Implications,Bulletin of the Seismological Society of America,97(1A),S71~S85.
Reena De,J.R.Kayal.2003·Seismotectonic Model of the SikkimHimalaya:Constraint from Microearthquake Surveys,Bulletin of theSeismological Society of America,93(3):1395~1400.
S.Dineva,D.Eaton,S.Ma,R.Mereu.2007·The October2005Georgian Bay,Canada,Earthquake Sequence:Mafic Dykes andTheir Role inthe Mechanical Heterogeneity of Precambrian Crust,Bulletin of the Seismological Society of America,97(2):457~473.
Serva L.,1993·An analysis of the world major regulatory guides for nuclear plant seismic design,Energia Nucleare,10(2):77~96.
Steven N.Ward.1994·A multidisciplinary approach to seismic hazard in southern California,Bulletin of the Seismological Society ofAmerica,84(5):1293~1309.
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