SEISMOLOGY AND GEOLOGY ›› 1995, Vol. 17 ›› Issue (3): 218-224.

• Brief Report • Previous Articles     Next Articles

RESEARCH ON ACTIVITY OF YUSHU FAULT

Li Minfeng1, Xing Chengqi2, Cai Changxing3, Guo Wenxiu1, Wu Shuxue4, Yuan Zhuzhong1, Meng Yongqi1, Tu Delong4, Zhang Ruibin4, Zhou Rongiun3   

  • Received:1993-04-30 Revised:1995-03-31 Online:1995-09-06 Published:2009-11-25

玉树断裂活动性研究

李闽峰1, 邢成起2, 蔡长星3, 国文秀1, 邬树学4, 袁著忠1, 孟勇琦1, 涂德龙4, 张瑞斌4, 周荣军3   

  1. 1. 国家地震局地质研究所, 北京 100029;
    2. 国家地震局兰州地震研究所, 兰州 730000;
    3. 四川省地震局, 成都 610041;
    4. 青海省地震局, 西宁 810001

Abstract:

After field investigation and lobaratory study,the Yushu fault can be separeted into threesegments from its activity in this paper. The northwestern segment of Yushu fault has undergonestrong horizontal movement since Q4. Its maximum horizontal slip rate is 7.3mm/a. Theresome palaeoearthquakes occurred along this segment. The middle segment has been activated inearly Quaternary.The southeastern segment has undergone strong horizontal movement sinceQ4. Its average horizontal slip rate is 5 mm/a,There many palaeoearthquakes occurred along thissegment.The maximum earthquake with magnitued of 7.0 took place at Dengke in 1896.

Key words: Faulting, Fault displacement rate, Palaeoearhtquake

摘要:

通过实地考察和室内工作,对玉树断裂的活动性进行了分段研究。该断裂划分为3段:(1)西北段全新世以来活动强烈,以水平左旋活动为主,水平滑动速率达7.3mm/a,沿断裂带展布大量的古地震事件遗迹;(2)中段第四纪以来的主体活动时段在晚更新世以前,以正断层活动为主;(3)东南段全新世以来活动强烈,以水平左旋活动为主,水平滑动速率约5mm/a,沿断裂带分布有大量的古地震事件遗迹,历史上记载的最大地震为1896年的邓柯7.0级地震。

关键词: 断层活动, 断层位移速率, 古地震