Although the Tacheng Basin may play an important role in accommodating crustal shortening north of the Tian Shan and west of the Junggar Basin based on observations of several conspicuous surface ruptures in satellite imagery, little is known about its late Quaternary tectonic activity. We analyze the tectonic geomorphology of the East Tacheng fault zone, including the subparallel NE‐SW trending East Tacheng and Wuerkashier faults, using field observations, interpretations of satellite imagery, and construction of decimeter‐scale digital elevation models from unmanned aerial vehicle surveys. Geomorphological features such as displaced stream channels and terrace risers, negligible vertical offset, opposite facing directions of a single fault scarp, and linear fault traces suggest that the East Tacheng fault is a nearly pure left‐lateral subvertical strike‐slip fault. The late Quaternary horizontal slip rate is estimated to be 0.4–2.0 mm/year, likely ∼0.7 mm/year. Paleoearthquake studies in trenches reveal that the most recent earthquake occurred between 3.1 and 0.5 ka. The Wuerkashier fault, which shows pristine surface ruptures along a total length of ∼67 km, is also a nearly pure left‐lateral strike‐slip fault. The most recent earthquake along this fault is dated to be 7.9–0.5 ka. Combining GPS velocity and active fault kinematics in the northern Tian Shan and western Junggar, we suggest that the western Junggar is controlled by regional N‐S crustal shortening related to the India‐Eurasia collision, and the reactivated Paleozoic fault zones in the western Junggar play a key role in transferring deformation northeastward into the Altai and Mongolia.

中文翻译：

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塔城东部断裂带：天山以北左旋走滑断裂带晚第四纪构造和滑移率

虽然塔城盆地可能在适应天山以北和准gar尔盆地以西的地壳缩短方面起着重要作用，但根据卫星图像中一些明显的表面破裂的观察，却对其晚期第四纪构造活动知之甚少。我们使用野外观测，卫星图像解释以及通过无人机飞行测量获得的十米级数字高程模型，分析了东塔城断裂带的构造地貌，包括亚平行的NE-SW趋势的东塔城断裂和乌尔卡西尔断裂。地貌特征，例如位移的河道和阶地立管，垂直偏移可忽略不计，单个断层陡坡的相对方向，线性断层迹线表明东塔城断层是近乎纯净的左下垂直走滑断层。第四纪晚期的水平滑动速率估计为0.4-2.0毫米/年，可能约为0.7毫米/年。海沟的古地震研究表明，最近的地震发生在3.1至0.5 ka之间。Wuerkashier断层显示出沿原始长度约67 km的原始表面破裂，它也是近乎纯净的左侧走滑断层。沿着该断层的最新地震的日期为7.9–0.5 ka。结合北天山和准Jung尔西部的GPS速度和活动断层运动学，我们建议准Jung尔西部受与印度-欧亚大陆碰撞有关的区域N-S地壳缩短的控制，