The Tian Shan is one of the largest and most active intracontinental mountain belts, and its active deformation has attracted much scientific attention. In this study, we investigated the characteristics of active deformation in the most complex, eastern Tian Shan through the analysis of focal mechanism solutions since 1976, velocity vectors of 25 years geodetic measurements, and existing studies on active tectonics. The results demonstrate that: (a) ~3.5 mm/year of convergence is accommodated by the southern Junggar fold‐and‐thrust belt, forming a series of active thrusts and folds. The Bolokelu‐Aqikekuduke Fault is a transpressional structure, accommodating ~1 mm/year shortening and ~1.5 mm/year of right‐lateral shear strain; (b) Most of the convergence in the Huola Shan region is absorbed by the North Luntai Fault, and the right‐lateral shear strain is probably accommodated by the Kaidu River Fault and the Songshudaban Fault; (c) Active deformation in the eastern Tian Shan under oblique convergence is mainly partitioned into widespread compressional deformation (folding and thrusting) and dextral displacements on the NW‐trending faults. Nevertheless, left‐lateral strike‐slip motions have also been observed, suggesting that further constraints on the kinematics and deformation rates of structures especially the intermontane structures are still needed with the aim of achieving a better understanding of strain distribution in the study area.

中文翻译：

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天山东部的主动变形和应变分布特征

天山是大陆上最大，最活跃的陆内山脉带之一，其活跃的变形引起了很多科学的关注。在这项研究中，我们通过分析自1976年以来的震源机制解，25年大地测量的速度向量以及有关活跃构造的现有研究，调查了最复杂的天山东部地区的活跃变形特征。结果表明：（a）准Jung尔南部的褶皱和冲断带容纳了约3.5毫米/年的会聚，形成了一系列活动的冲断和褶皱。Bolokelu-Aqikekuduke断层为超压构造，可缩短〜1 mm /年的缩短时间和〜1.5 mm /年的右侧剪切应变。（b）霍拉山地区的大部分汇合都被北轮台断裂所吸收，右旋剪应变可能是由开渡河断裂带和松树大板断裂带提供的；（c）天山东部在倾斜汇聚下的主动变形主要分为西北向断裂上的广泛的压缩变形（褶皱和逆冲）和右旋位移。尽管如此，还观察到了左右的走滑运动，这表明仍然需要进一步限制结构，特别是山间结构的运动学和变形率，以更好地了解研究区域的应变分布。（c）天山东部在倾斜汇聚下的主动变形主要分为西北向断裂上的广泛的压缩变形（褶皱和逆冲）和右旋位移。尽管如此，还观察到了左右的走滑运动，这表明仍需要进一步限制结构（特别是山间结构）的运动学和变形率，以更好地了解研究区域的应变分布。（c）天山东部在倾斜汇聚下的主动变形主要分为西北向断裂上的广泛的压缩变形（褶皱和逆冲）和右旋位移。尽管如此，还观察到了左右的走滑运动，这表明仍需要进一步限制结构（特别是山间结构）的运动学和变形率，以更好地了解研究区域的应变分布。