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本文根据大量野外地质调查资料,并结合人工探槽资料和~(14)C地质年龄数据,对本段断裂晚更新世晚期以来的断裂运动、滑动速率与古地震问题进行了讨论,得出下面的初步认识;①昌马断裂带东段晚更新世晚期以来的断裂运动特征以反时针走滑活动为主兼有倾滑活动,其平均滑动速率>2.13毫米/年。②1932年的地震断裂运动与基底断裂断面倾向南的压性断层特征发生了明显变化,这种变化从晚更新世晚期就已开始。③晚更新世晚期以来,本段断裂发生过三次强震事件。三次强震事件的年代为:Ⅰ<24850年;5095年<Ⅱ<Ⅰ;第Ⅲ期即1932年地震。
Based on a large amount of field geologic survey data and data of artificial trenches and geologic age data of ~ (14) C, this paper discusses the fault movement, sliding velocity and paleoearthquakes since the late Late Pleistocene in this section, and concludes that Preliminary findings: ① The fault movement characteristics in the eastern part of the Changma fault zone since the late stage of Late Pleistocene are dominated by anti-clockwise slip activities with an average slip rate> 2.13 mm / year. ② The characteristics of the compressional fault in the south of 1932 with the earthquake fault movement and basal rupture changed obviously, and the change started from the Late Pleistocene. ③ Since the late Pleistocene, three strong earthquakes occurred in this segment of the fault. The times of the three strong earthquakes are as follows: Ⅰ <24850 years; 5095 years <Ⅱ <Ⅰ; Ⅲ period is the 1932 earthquake.