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  王晓楠,唐方头,邵翠茹.南迦巴瓦构造结周边地区主要断裂现今运动特征[J].震灾防御技术,2018,(2):267-275, DOI:10.11899/zzfy20180202.

南迦巴瓦构造结周边地区主要断裂现今运动特征
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。
作者单位
王晓楠 中国地震局地球物理研究所, 北京 100081 
唐方头 中国地震局地球物理研究所, 北京 100081 
邵翠茹 中国地震局地球物理研究所, 北京 100081 
关  键  词:南迦巴瓦构造结  断裂运动特征  CAP方法  震源机制解
DOI:10.11899/zzfy20180202
基金项目:国家自然科学基金项目(41472199、41274101)和“雅鲁藏布江下游地震观测台网台站建设”项目共同资助
收稿日期:2018-03-25
作者简介:王晓楠,女,生于1992年。硕士研究生。研究方向:地震学。E-mail:xiaowuni511@qq.com
通讯作者:唐方头,男,生于1965年。研究员。主要从事活动构造与地球动力学研究工作。E-mail:fttang@sina.com
The Current Movement Characters of Main Faults Surrounding the Namcha Barwa Syntaxis
Abstract:      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 10km 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.
Keywords:  Namcha Barwa syntaxis  Fault movement characters  The CAP method  Focal mechanism solution
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