Abstract: A number of buried traces associated with paleoearthquake have been found through large-scale excavation,conducted along the Koktokay-Ertai fault,the sites of Haizikou,Tuerhong.Laoshankou,Xinshankou and Ganqou etc.Based on available data of comparable Quaternary sediments and ¹⁴C dating,five paleoearthquakes may be determined.Calculations of the average rate of regional vertical deformation and fault slip yielded a value of 0.3-0.4mm/yr and 3.5mm/yr,respectively;it follows that for 10000 years,the average interoccurrence time for these events is 3150 years.

摘要： 可可托海一二台活断层(简称二台断层)是1931年富蕴8级地震的发震构造。在这条断层上地震历史的文字记载资料很少,19S1年综合研究富蕴地震断裂带时曾在地表发现过不少古地震遗迹。现代活断层研究,开挖已成为重要手段之一,藉以查明古地震事件、大地震复现期和断层活动速率。最近,我们在二台断层北起海子口、南至干沟等几个地段进行了大规模开挖,揭露出许多被掩埋的古地震遗迹,对解决二台断层的大震复现期和活动速率提供了依据。