%0 Journal Article
%T 2016年12月8日新疆呼图壁MS6.2地震发震构造初步研究<br>A Preliminary Study of Seismogenic Structure for the Hutubi,Xinjiang MS6.2 Earthquake on December 8, 2016
%A 张志斌
%A 冉慧敏
%A 金花
%J 地震工程学报
%D 2019
%R 10.3969/j.issn.1000-0844.2019.04.962
%X 2016年12月8日呼图壁县发生MS6.2地震，由于初始定位误差较大，余震序列分布离散，对呼图壁地震的发震断层尚不清楚。本研究采用CAP方法反演主震及余震中MS ≥ 3.5地震的震源机制解，并采用双差定位方法对余震进行重定位，得到了637个地震的震源参数。结果显示，呼图壁地震主震的最佳双力偶节面解为：节面Ⅰ走向82°，倾角18°，滑动角61°；节面Ⅱ走向292°，倾角74°，滑动角98°。其中节面Ⅱ为本次地震的破裂面。重定位后，主震的震源位置被重定为（86.36°E，43.79°N），震源深度14 km，根据余震的分布特点、震源机制解特征和区域构造特征，呼图壁地震的发震断层并不是南倾的准噶尔南缘断裂，而是在其北边的霍尔果斯-玛纳斯-吐谷鲁断裂带上的一个反冲断层。在北天山区域内，由于构造反转的作用，存在诸多倾角在45°~55°之间的北倾的断层。根据GPS的资料显示，天山北部地区的应力在新生代晚期已开始积累，这增加了天山北部前缘的发震概率。<br>On December 8, 2016, an MS6.2 earthquake occurred in Hutubi County, Xinjiang. Given the large uncertainty in initial earthquake location, the aftershock sequence was discrete, and the causative fault of Hutubi earthquake remains unknown. In this study, the CAP method was used to invert the focal mechanism solutions of the main earthquake and aftershocks (MS ≥ 3.5). Aftershocks were relocated by double-difference location algorithm. We obtained the source parameters of 637 earthquakes. The results show that the focal mechanism solution of Hutubi earthquake featured a strike, dip, and rake of 82°, 18°, and 61°, respectively, on the first nodal plane and 292°, 74°, and 98° on the second nodal plane. The earthquake involved a nodal surface Ⅱ rupture of. After relocation, the Hutubi earthquake was relocated at 86.36° E, 43.79° N, with a depth of 14 km. According to the distribution characteristics, focal mechanism solution characteristics, and regional structure characteristics of aftershocks, we inferred that the seismogenic fault of the Hutubi earthquake was not the southern Junggar fault but a back thrust fault on the Huoerguosi-Manas-Tugulu fault. In the northern Tianshan, structural inversion causes the formation of numerous faults in the north dip with inclination angles between 45° and 55°. According to Global Positioning System data, stress in the northern part of Tianshan accumulated in the Late Cenozoic, thus increasing the probability of earthquakes
%K 呼图壁MS6.2地震
%K 震源机制
%K 双差定位
%K 反冲断层<br>Hutubi MS6.2 earthquake
%K focal mechanism solution
%K double-difference location
%K back thrust fault
%U http://dzgcxb.ijournals.cn/ch/reader/view_abstract.aspx?file_no=20190420&flag=1