地震地质 ›› 2011, Vol. 33 ›› Issue (2): 347-355.DOI: 10.3969/j.issn.0253-4967.2011.02.008

• 新构造与活动构造 • 上一篇    下一篇

榆木山北缘断裂古地震特征研究

金卿1,2, 何文贵1,2, 史志刚1,2, 袁道阳1,2   

  1. 1. 中国地震局兰州地震研究所, 兰州 730000;
    2. 中国地震局地震预测研究所兰州科技创新基地, 兰州 730000
  • 收稿日期:2011-02-27 修回日期:2011-05-13 出版日期:2011-06-29 发布日期:2011-12-17
  • 作者简介:金卿,女,1984年生,2006年毕业于中国石油大学(华东)资源勘查工程专业,现在中国地震局兰州地震研究所攻读构造地质学硕士学位,主要从事活动构造方面的研究工作。E-mail: jinqing_1219@163.com。
  • 基金资助:

    国家自然科学基金(40872132)和中国地震局中国大陆7级以上大震危险区预测项目共同资助

PALAEO-EARTHQUAKE STUDY ON THE NORTHERN YUMUSHAN ACTIVE FAULT

JIN Qing1,2, HE Wen-gui1,2, SHI Zhi-gang1,2, YUAN Dao-yang1,2   

  1. 1. Lanzhou Institute of Seismology,China Earthquake Administration,Lanzhou 730000,China;
    2. Lanzhou Base of Institute of Earthquake Prediction,China Earthquake Administration,Lanzhou 730000, Chian
  • Received:2011-02-27 Revised:2011-05-13 Online:2011-06-29 Published:2011-12-17

摘要:

榆木山北缘断裂位于祁连山主体山系以北的榆木山北部边缘。断裂活动形成一系列沿山前发育的断层陡坎。通过探槽剖面对发生在该断裂带上的古地震事件进行了分析,大致可以确定全新世以来的2次古地震事件。事件Ⅰ的年代为距今(4.066±0.086)ka; 事件Ⅱ为距今(6.852±0.102)ka至(6.107±0.082)ka之间。该断裂的最后一次古地震事件发生在距今(4.066±0.086)ka,并非公元180年表氏7 1/2 级地震的发震断裂。

关键词: 榆木山北缘断裂, 古地震, 河西走廊, 公元180年表氏7, 1/2, 级地震

Abstract:

The northern Yumushan Fault located on the northern flank of Qilian fold system is an active fault in Holocene.The fault is about 60km 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±0.086ka BP,and event II is between 6.852±0.102ka BP and 6.107±0.082ka BP.The last palaeo-earthquake event on this fault occurred in 4.066±0.086ka BP. So,the northern Yumushan Fault is not the seismogenic fault of the M 7 1/2 Biaoshi earthquake of 180 AD.The elapse time from the latest event has been 4000yr,so the possibility of generating destructive earthquake in future should be recognized sufficiently.

Key words: Northern Yumushan Fault, palaeo-earthquake, Hexi Corridor, the M 7 1/2 Biaoshi earthquake in 180 AD

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