南迦巴瓦构造结周边地区主要断裂现今运动特征
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摘要
本文基于南迦巴瓦构造结周边16个宽频带地震台的观测波形数据,对地震事件进行相关分析,使用MSDP软件进行多台定位,编制了研究区内的地震目录,并利用CAP方法获得了研究区内主要断裂带两侧10km范围内M 3.0以上地震的震源机制解,用于分析主要断裂带的现今运动特征。研究结果表明:研究区内的地震活动受主要断裂带的控制;墨脱断裂带现今运动主要为左旋逆冲运动;米林断裂带以左旋正断运动为主;嘉黎断裂带以右旋逆冲为主,兼有左旋和正断运动;阿帕龙断裂带以右旋逆冲运动为主;边坝-达木新生断裂带运动以右旋逆冲运动为主,兼有正断和左旋运动;各主要断裂带的现今运动特征与地质和GPS观测结果相同,表明南迦巴瓦构造结周边地区主要断裂带的现今运动主要受阿萨姆构造结俯冲作用的控制。
In order to obtain the characteristics of the current movement for the main faults, a catalog of earthquake was derived from 16 seismographs located around the Namcha Barwa syntaxis with correlation analysis via the MSDP software, and the focal mechanism of M≥3.0 earthquakes occurred within 10 km from the main faults was derived with the CAP method. The results show that earthquake activity in the study area was mainly controlled by the main faults. The Mêdog fault zone is mostly sinistral strike-slip with thrusting component. The Mainling fault zone is dominated by sinistral strike-slip with normal component. The Lhari fault zone is dominated by dextral strike-slip with thrusting component,accompanying sinistral strike-slip and normal movement. The Apalong fault zone is dominated by dextral strike-slip with thrusting component. The Banbar-Damu new fault zone is dominated by dextral strike-slip with thrusting component,accompanying normal movement and sinistral strike-slip. The above characteristics of movement are in accordance with the geology and GPS observation data, which shows that the movement of main fault zones surrounding the Namcha Barwa syntaxis is mainly controlled by the Assam syntaxis subduction.
In order to obtain the characteristics of the current movement for the main faults, a catalog of earthquake was derived from 16 seismographs located around the Namcha Barwa syntaxis with correlation analysis via the MSDP software, and the focal mechanism of M≥3.0 earthquakes occurred within 10 km from the main faults was derived with the CAP method. The results show that earthquake activity in the study area was mainly controlled by the main faults. The Mêdog fault zone is mostly sinistral strike-slip with thrusting component. The Mainling fault zone is dominated by sinistral strike-slip with normal component. The Lhari fault zone is dominated by dextral strike-slip with thrusting component,accompanying sinistral strike-slip and normal movement. The Apalong fault zone is dominated by dextral strike-slip with thrusting component. The Banbar-Damu new fault zone is dominated by dextral strike-slip with thrusting component,accompanying normal movement and sinistral strike-slip. The above characteristics of movement are in accordance with the geology and GPS observation data, which shows that the movement of main fault zones surrounding the Namcha Barwa syntaxis is mainly controlled by the Assam syntaxis subduction.
引文
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丁林,钟大赉,2013.印度与欧亚板块碰撞以来东喜马拉雅构造结的演化.地质科学,48(2):317-333.
韩立波,蒋长胜,包丰,2012.2010年河南太康MS 4.6地震序列震源参数的精确确定.地球物理学报,55(9):2973-2981.
洪德全,王行舟,倪红玉等,2013.多种方法研究2012年7月20日江苏高邮MS 4.9级地震震源机制解和震源深度.地球物理学进展,28(4):1757-1765.
任金卫,沈军,曹忠权等,2000.西藏东南部嘉黎断裂新知.地震地质,22(4):344-350.
沈军,2001.青藏高原及邻区岩石圈现今变动与动力学研究.北京:中国科学院地质与地球物理研究所.
宋键,唐方头,邓志辉等,2013.青藏高原嘉黎断裂晚第四纪运动特征.北京大学学报(自然科学版),49(6):973-980.
谭毅培,曹井泉,刘文兵等,2014.柳艳丽.2013年3月涿鹿微震群遗漏地震事件检测和发震构造分析.地球物理学报,57(6):1847-1856.
唐方头,宋键,曹忠权等,2010.最新GPS数据揭示的东构造结周边主要断裂带的运动特征.地球物理学报,53(9):2119-2128.
西藏自治区科学技术委员会,国家地震局科技监测司,1988.西藏察隅当雄大地震.拉萨:西藏人民出版社.
谢超,杨晓平,黄雄南等,2016.东喜马拉雅构造结墨脱断裂晚第四纪活动地质证据的发现.地震地质,38(4):1095-1106.
张明华,2007.基于RS、GIS的东喜马拉雅南迦巴瓦峰地区断裂构造的定量研究.大地构造与成矿学,31(4):418-423.
赵宏,屈娥,2015.消除仪器响应的数字地震实验.当代教育实践与教学研究,(5):193-195.
郑勇,马宏生,吕坚等,2009.汶川地震强余震(MS≥5.6)的震源机制解及其与发震构造的关系.中国科学D辑:地球科学,39(4):413-426.
Devachandra M.,Kundu B.,Catherine J.,et al.,2014.Global Positioning System(GPS)measurements of crustal deformation across the frontal Eastern Himalayan Syntaxis and seismic-hazard assessment.Bulletin of the Seismological Society of America,104(3):1518-1524.
Gupta T.D.,Riguzzi F.,Dasgupta S.,et al.,2015.Kinematics and strain rates of the Eastern Himalayan Syntaxis from new GPS campaigns in Northeast India.Tectonophysics,655:15-26.
Li K.,Xu X.W.,Kirby E.,et al.,2018.Late Quaternary paleoseismology of the Milin fault:Implications for active tectonics along the Yarlung Zangbo Suture,Southeastern Tibet Plateau.Tectonophysics,731-732:64-72.
Mukhopadhyay B.,Asgupta S.,2015.Earthquake swarms near eastern Himalayan Syntaxis along Jiali Fault in Tibet:A seismotectonic appraisal.Geoscience Frontiers,6(5):715-722.
Wei S.J.,Zhan Z.W.,Tan Y.,et al.,2012.Locating earthquakes with surface waves and centroid moment tensor estimation.Journal of Geophysical Research,117(B4):B04309.
Zhu L.P.,Helmberger D.V.,1996.Advancement in source estimation techniques using broadband regional seismograms.Bulletin of the Seismological Society of America,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.Geophysical Journal International,148(3):619-627.
1 唐方头,2017.青藏高原右旋剪切带南部边界的厘定.国家自然基金(41274101)结题报告。
1 邵翠茹,2013.南迦巴瓦构造结地震监测及深浅构造关系研究.中国地震局地球物理研究所,中国地震局地球物理研究所中央级公益性科研院所基本科研业务专项资助项目结题报告。
1 唐方头,2017.青藏高原右旋剪切带南部边界的厘定.国家自然基金(41274101)结题报告。
丁林,钟大赉,2013.印度与欧亚板块碰撞以来东喜马拉雅构造结的演化.地质科学,48(2):317-333.
韩立波,蒋长胜,包丰,2012.2010年河南太康MS 4.6地震序列震源参数的精确确定.地球物理学报,55(9):2973-2981.
洪德全,王行舟,倪红玉等,2013.多种方法研究2012年7月20日江苏高邮MS 4.9级地震震源机制解和震源深度.地球物理学进展,28(4):1757-1765.
任金卫,沈军,曹忠权等,2000.西藏东南部嘉黎断裂新知.地震地质,22(4):344-350.
沈军,2001.青藏高原及邻区岩石圈现今变动与动力学研究.北京:中国科学院地质与地球物理研究所.
宋键,唐方头,邓志辉等,2013.青藏高原嘉黎断裂晚第四纪运动特征.北京大学学报(自然科学版),49(6):973-980.
谭毅培,曹井泉,刘文兵等,2014.柳艳丽.2013年3月涿鹿微震群遗漏地震事件检测和发震构造分析.地球物理学报,57(6):1847-1856.
唐方头,宋键,曹忠权等,2010.最新GPS数据揭示的东构造结周边主要断裂带的运动特征.地球物理学报,53(9):2119-2128.
西藏自治区科学技术委员会,国家地震局科技监测司,1988.西藏察隅当雄大地震.拉萨:西藏人民出版社.
谢超,杨晓平,黄雄南等,2016.东喜马拉雅构造结墨脱断裂晚第四纪活动地质证据的发现.地震地质,38(4):1095-1106.
张明华,2007.基于RS、GIS的东喜马拉雅南迦巴瓦峰地区断裂构造的定量研究.大地构造与成矿学,31(4):418-423.
赵宏,屈娥,2015.消除仪器响应的数字地震实验.当代教育实践与教学研究,(5):193-195.
郑勇,马宏生,吕坚等,2009.汶川地震强余震(MS≥5.6)的震源机制解及其与发震构造的关系.中国科学D辑:地球科学,39(4):413-426.
Devachandra M.,Kundu B.,Catherine J.,et al.,2014.Global Positioning System(GPS)measurements of crustal deformation across the frontal Eastern Himalayan Syntaxis and seismic-hazard assessment.Bulletin of the Seismological Society of America,104(3):1518-1524.
Gupta T.D.,Riguzzi F.,Dasgupta S.,et al.,2015.Kinematics and strain rates of the Eastern Himalayan Syntaxis from new GPS campaigns in Northeast India.Tectonophysics,655:15-26.
Li K.,Xu X.W.,Kirby E.,et al.,2018.Late Quaternary paleoseismology of the Milin fault:Implications for active tectonics along the Yarlung Zangbo Suture,Southeastern Tibet Plateau.Tectonophysics,731-732:64-72.
Mukhopadhyay B.,Asgupta S.,2015.Earthquake swarms near eastern Himalayan Syntaxis along Jiali Fault in Tibet:A seismotectonic appraisal.Geoscience Frontiers,6(5):715-722.
Wei S.J.,Zhan Z.W.,Tan Y.,et al.,2012.Locating earthquakes with surface waves and centroid moment tensor estimation.Journal of Geophysical Research,117(B4):B04309.
Zhu L.P.,Helmberger D.V.,1996.Advancement in source estimation techniques using broadband regional seismograms.Bulletin of the Seismological Society of America,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.Geophysical Journal International,148(3):619-627.
1 唐方头,2017.青藏高原右旋剪切带南部边界的厘定.国家自然基金(41274101)结题报告。
1 邵翠茹,2013.南迦巴瓦构造结地震监测及深浅构造关系研究.中国地震局地球物理研究所,中国地震局地球物理研究所中央级公益性科研院所基本科研业务专项资助项目结题报告。
1 唐方头,2017.青藏高原右旋剪切带南部边界的厘定.国家自然基金(41274101)结题报告。