Palaeo-Earthquake Study on the Northern Yumushan Active Fault
详细信息
- 责任者：Jin Qing (Lanzhou Institute of Seismology ; China Earthquake Administration ; Lanzhou 730000 ; China) ; He Wengui
- 刊名：Seismology and Geology
- 出版年：2011
- 卷期：33(2)
- 关键词：古地震 ; paleoearthquakes ; 河西走廊 ; Hexi Corridor
- 页码：p.347-355
- 图表：5 illus., 8 refs.
- 分类号：0500
- 出版序号：757
- issnNo：ISSN0253-4967
- isbnNo：CN11-2192/P
摘要
///The northern Yumushan Fault located on the northern flank of Qilian fold system is an active fault in Holocene. The fault is about 60 km long, trending NWW. It is a trust fault with left-lateral strike-slip component. The activity of the fault produced a series of scarps along the mountain front. The fault zone is divided into three segments, and the middle part is the most active. In this paper, palaeo-earthquake events on the fault are studied. With the study of trench profiles, two palaeo-earthquake events are determined. Event I occurred at (4.066±0.086) ka B.P., and event II is between (6.852±0.102) ka B.P. and (6.107±0.082) ka B.P. The last palaeo-earthquake event on this fault occurred in (4.066±0.086) ka B.P. So, the northern Yumushan Fault is not the seismogenic fault of the M 71/2 Biaoshi earthquake of 180 A.D.. The elapse time from the latest event has been 4 000 yr, so the possibility of generating destructive earthquake in future should be recognized sufficiently.