摘要
二台断裂南段在乌伦古河流域分叉、折尾,显示出破裂末端特征。据断层活动资料,自晚更新世中期以来南段有5次活动,主要为右旋逆走滑活动,末端为右旋正走滑。水平错动幅度达3个量级4个梯度,最大达350m。1984—1988年形变测量资料表明该段目前正以2.1mm/年的速率作左旋旷动。各种古地震活动标志表明南段大震平均复现期为3500±290年。
The southern segment of the Ertai fault been branched and bent to the drainage basin of Wulungu river gave us some suggestion of the end of the fracture . According to the historical recordings, we know that the southern segment of the Ertai fault at least had moved 5 times since the middle stage of Late Pleistocene. Most of the motions were in the form of right-lateral thrust-slip, but at the end of the fracture, right-normal-slip were found . The offset range was up to three magnitudes and four gradient with its maximum motion 350m. The data of 3 times deformation measurement during 1984 - 1988 showed that the southern segment of the Ertai fault dislocated left-lateral with rate of 2. 1 mm/year recently . It has been proved by various kinds of paleoseismic activities that the recurrence of large earthquakes was approximate to 3500?90 years on this segment.
出处
《内陆地震》
1991年第4期289-295,共7页
Inland Earthquake
关键词
活断层
第四纪
活动速率
古地震
Ertai Active fault Quaternary activity Active rate Recurrence of paleo-earthquake
