| 西藏米林6.9级地震发震断层判定及其构造属性讨论 |
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| 引用本文：唐方头,尤惠川,梁小华,宋键,王晓楠.2019.西藏米林6.9级地震发震断层判定及其构造属性讨论[J].地球学报,40(1):213-218. |
| DOI：10.3975/cagsb.2018.111302 |
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| 基金项目:国家自然科学基金项目(编号: 41274101; 41472199) |
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| 中文摘要:西藏米林6.9级地震是1950年察隅MS8.6级地震以来东构造结地区发生的第一个6级以上地震, 由于地震发生在雅鲁藏布江大拐弯附近的无人区, 野外应急科学考察没有发现明显的地震地表破裂带。根据林芝流动地震观测台网记录到的余震条带状分布、震后科学考察获得的地震烈度长轴方位、原有台阵观测震中分布以及GPS资料和野外地质调查分析, 发现发震断层为NW向排龙—帮辛断裂, 逆冲性质, 为新生NW向边坝—达木断裂带中段组成部分; 米林地震的发生预示东构造结地区地震活动强度加强, 未来该地区发生7级以上地震危险性不容忽视。 |
| 中文关键词:米林地震 发震断层 东构造结 地震活动 地震趋势 |
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| A Discussion on Seismogenic Fault of the Milin MS6.9 Earthquake, Tibet,and Its Tectonic Attributes |
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| Abstract:Milinearthquake (MS6.9) has been the first above MS6 earthquake occurring in Eastern Himalayan Syntaxis areas since the Chayu MS8.6 in 1950. Due to Milin (MS6.9) occurred in a no man’s land near the Great Bend of the Brahmaputra, no surface rupture zone was observed during the emergency scientific investigation in the epicenter. According to the belt distribution of aftershocks recorded by Linzhi earthquake mobile observatories network, the dominated axial azimuth of the earthquake intensities after earthquake, and the analysis of GPS data as well as field geological investigation, the seismogenic fault of the Milin earthquake is a NW–trending thrust fault, called the Palong–Bangxin fault, which may belong to the middle part of the new NW–trending Bianba-Damu fault zone. The occurrence of the Milin earthquake indicates that the intensity of seismic activity in Eastern Himalayan Syntaxis area is strengthened, and hence the seismic risk over 7 magnitude in this region cann’t be ignored in the future. |
| keywords:Milin earthquake seismogenic fault Eastern Himalayan Syntaxis seismic activity earthquake trend |
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