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通过对西山断层系详细地追踪考察和系列探槽的开挖,并结合深部探测资料进行了综合分析,认为晚第四纪以来,在近NS向的挤压应力作用下,西山块体不断向南侧天山山体方向发展,总体表现为向南的逆冲滑移和地壳缩短.其南侧的主控边界断裂——西山断层的新活动性主要表现为向南的逆冲.西山断层北侧的王家沟断层组和九家湾断层组是与西山断层具有成因联系的次级断层,均为伴随西山隆起形成的顺层滑动断层.但九家湾断层组明显受到博格达推覆体系的影响,是局部拉张应力下产生的正断层.这两组断层吸收转换了西山断层上盘的褶皱变形量,因而西山断隆表现为明显的单斜特征.西山断层系的各条次级断层属于同一发震构造体系,其大震的地震危险性应该合并考虑.
Through a detailed tracing of the Xishan fault system and excavation of a series of exploration trenches and a comprehensive analysis based on deep exploration data, it is considered that under the action of compressive stress in the near NS direction since the late Quaternary, The Tianshan Mountains in the south are developed in the direction of southward thrusting and crustal shortening.The main controlling boundary faults in the south of the Xishan fault are mainly thrusting southward.The north side of the Xishan fault The Wangjiagou fault group and the Jiujiawan fault group are secondary faults that have a genetic relationship with the Xishan fault and are all synrotaxial slip faults formed along with the Xishan uplift, but the Jiuguan fault group was obviously affected by the , Which is a normal fault generated by local tensile stress.These two sets of fault absorption transform the fold deformation of the upper plate of the Xishan fault so that the Xishan fault is characterized by obvious monoclinic features.The secondary fault of the Xishan fault system Belong to the same seismogenic structure, the earthquake risk of the earthquake should be considered together.