论文部分内容阅读
本文根据最新的现场考察结果,详细地讨论了1932年昌马7(1/2)级地震形变带的基本特征和昌马断裂最新活动特点。昌马断裂是活动历史悠久,切割地壳较深,现今仍在活动的超岩石圈断裂。我们发现该断裂使一系列山脊和冲沟发生了明显逆时针方向错动,其水平错距可分为四级,反映了昌马断裂至少经历了四次活动,最后一次的水平错距为4.68米,很可能是1932年昌马地震时造成的。昌马地震形变带比较清晰,其展布基本上与昌马断裂相吻合,形变带由地裂缝、鼓包和陡坎构成,并伴有滑坡和山崩现象。形变带组合关系的力学分析均显示了反时针错动,说明第四纪晚期昌马断裂是以左旋张扭性活动为特征。最后本文初步探讨了昌马地震成因模式。
Based on the latest field observations, this paper discusses in detail the basic characteristics of the deformation zone of Changchun 7 (1/2) Earthquake in 1932 and the latest features of the Changma Fault. The Changma fault is a long-lived, cut-deep crust that is still active in the ultra-lithospheric fault. We found that this fault caused a significant counterclockwise misalignment of a series of ridges and gullys. The horizontal faults can be divided into four levels, reflecting that the Changma fault has undergone at least four activities with the last one having a horizontal offset of 4.68 It is most likely caused by the Chang-chang earthquake in 1932. The deformation zone of Changma earthquake is relatively clear, and the distribution is consistent with the Changma fault. The deformation zone consists of ground fissures, bulges and scarps with landslides and landslides. The mechanical analysis of the deformation zone combination shows anti-clockwise anti-clockwise movement, which shows that the Chang-Chang fault in the late Quaternary period is characterized by left-lateral torsional activity. Finally, this paper explores the genetic model of Changma earthquake.