中文摘要：

本研究采用基于贝叶斯理论的绝对定位方法对2014年2月12日新疆于田MS7.3级地震进行绝对定位，得到震中位置为82.56°E、36.04°N、震源深度为12.3 km；采用双差定位法对254个地震序列进行相对定位，得到101个重定位事件.结果显示，主震位于阿尔金断裂带西南端多个分支断裂的交汇处.余震震源主要分布范围在5~10 km深度之间，主震处余震代表的断层面较为陡立，且余震序列呈现出明显的西南向纯单侧扩展模式.沿阿尔金断裂带主震的北东向民丰震区本次地震后显示一个明显的地震丛集，说明本次主震对该震区具有触发作用.

英文摘要：

Using the Bayesian absolute location method,we obtained the Yutian, Xinjiang, earthquake （MS7.3） epicenter parameters, 82.56°E, 36.04°N, and 12.3 km in depth. We also relocated the 254 aftershocks using the double-difference algorithm, and finally obtained 101 relocated earthquakes. Our results show that the mainshock is located at the junction of several branches of the southwestern Altyn Tagh fault zone. The aftershocks are mainly located at 5~10 km depth. The fault plane reflected by aftershocks around the mainshock is very steep, and these aftershocks clearly demonstrate a purely unilateral extension in southwest direction. There is a clear event cluster at the Minfeng seismic area in the NE direction of the Altyn Tagh fault zone, which may be triggered by the mainshock.