The Taiyuan basin, initiated during the late Cenozoic, is part of the left-stepping en-echelon graben systems of Shanxi. The state of stress in this area and its evolution over time is a significant concern given the existence of high shear strain and seismic risk along the basin boundary faults. In the present study, the inversion of fault-slip data through the right dihedron and the rotational optimization methods led us to identify 21 significant paleostress tensors. The maximum principal stress orientation shows two modes trending NE–SW and ENE–WSW with most of stress tensors having stress ratio values within a wrench regime. The extensional sites reveal NW–SE and NE–SW directions. Three tectonic stages with different kinematics were successfully identified since the late Cenozoic. The oldest event has been identified in our analysis since the late Miocene to late Pliocene and belongs to NW–SE extension/strike-slip stress regime. The next was generated in the early Pleistocene under the NE–SW extension stress regime, and the youngest activity recorded belongs to the NNW–SSE extension/strike-slip regime developed since the late Pleistocene. These events were dynamically driven by the northeastward extrusion of the Tibetan Plateau in response to the plate boundary motion involving the Indian and Eurasian plates and lesser by the NW subduction of the Pacific plate. The present-day stress state is characterized by ENE–WSW compression and NNW–SSE extension derived from earthquake focal mechanisms.

太原盆地始于新生代晚期，是山西左阶梯级grab斗系统的一部分。考虑到沿盆地边界断层的高剪切应变和地震风险，该地区的应力状态及其随时间的演变是一个重大问题。在本研究中，通过右二面体的断层滑动数据反演和旋转优化方法使我们确定了21个重要的古应力张量。最大主应力方向显示出两种模式趋向NE–SW和ENE–WSW，其中大多数应力张量在扳手状态内具有应力比值。伸展部位揭示了西北和东南方向。自新生代晚期以来，已成功地确定了具有不同运动学的三个构造阶段。从中新世晚期到上新世晚期，我们已经确定了最古老的事件，属于NW–SE扩展/走滑应力状态。下一个是在NE-SW扩展应力体制下的更新世早期产生的，记录的最年轻的活动属于自更新世晚期以来发展的NNW-SSE扩展/走滑体制。这些事件是由青藏高原向东北方向挤压而动态驱动的，以响应涉及印度和欧亚板块的板块边界运动，而太平洋板块的西北俯冲则较小。当前的应力状态的特征是从地震震源机制推导出的ENE-WSW压缩和NNW-SSE扩展。下一个是在NE-SW扩展应力体制下的更新世早期产生的，记录的最年轻的活动属于自更新世晚期以来发展的NNW-SSE扩展/走滑体制。这些事件是由青藏高原向东北方向挤压而动态驱动的，以响应涉及印度和欧亚板块的板块边界运动，而太平洋板块的西北俯冲则较小。当前的应力状态的特征是从地震震源机制推导出的ENE-WSW压缩和NNW-SSE扩展。下一个是在NE-SW扩展应力体制下的更新世早期产生的，记录的最年轻的活动属于自更新世晚期以来发展的NNW-SSE扩展/走滑体制。这些事件是由青藏高原向东北方向挤压而动态驱动的，以响应涉及印度和欧亚板块的板块边界运动，而太平洋板块的西北俯冲则较小。当前的应力状态的特征是从地震震源机制推导出的ENE-WSW压缩和NNW-SSE扩展。这些事件是由青藏高原向东北方向挤压而动态驱动的，以响应涉及印度和欧亚板块的板块边界运动，而太平洋板块的西北俯冲则较小。当前的应力状态的特征是从地震震源机制推导出的ENE-WSW压缩和NNW-SSE扩展。这些事件是由青藏高原向东北方向挤压而动态驱动的，以响应涉及印度和欧亚板块的板块边界运动，而太平洋板块的西北俯冲则较小。当前的应力状态的特征是从地震震源机制推导出的ENE-WSW压缩和NNW-SSE扩展。