地震地质 ›› 2008, Vol. 30 ›› Issue (2): 400-411.

• 研究论文 • 上一篇    下一篇

则木河断裂带大箐梁子附近古地震组合探槽研究

田勤俭1,2, 任治坤2, 张军龙2,3   

  1. 1. 中国地震灾害防御中心, 北京, 100029;
    2. 中国地震局地震预测研究所, 北京, 100036;
    3. 中国地震局地质研究所, 北京, 100029
  • 收稿日期:2007-04-23 修回日期:2008-05-18 出版日期:2008-06-20 发布日期:2009-08-16
  • 作者简介:田勤俭,男,1966年生,1998年在中国地震局地质研究所获得博士学位,研究员,主要从事地震构造方面的研究工作,电话:010-82028809,E-mail:tianqj@263.net.
  • 基金资助:
    国家重点基础研究发展计划项目(2004CB418401)资助

STUDY OF PALEOEARTHQUAKES BY COMBINED TRENCH ON ZEMUHE FAULT AROUND DAQINGLIANGZI, XICHANG, SICHUAN

TIAN Qin-jian1,2, REN Zhi-kun2, ZHANG Jun-long2,3   

  1. 1. China Earthquake Disaster Prevention Center, Beijing 100029, China;
    2. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;
    3. Institute of Geology, China Earthquake Administration, Beijing 100029, China
  • Received:2007-04-23 Revised:2008-05-18 Online:2008-06-20 Published:2009-08-16

摘要: 古地震事件定年具不确定性,为了增加地震事件定年的可信度,文中通过断层活动方式、沉积环境和地震微地貌的综合分析来研究则木河断裂带上的古地震事件。在大箐梁子附近开挖组合探槽,揭露了3次古地震事件,分别距今约160a、3100a和5500~8900a,复发间隔为3000a左右;讨论了与走滑断层型地震相关的沉积过程,揭示了走滑断层在山坡部位形成鼓包和反向陡坎情况下的沉积模式。

关键词: 古地震, 组合探槽, 地震微地貌, 则木河, 沉积模式

Abstract: There exist some uncertainties in dating paleoearthquakes.To improve the credibility of determination of the earthquakes,comprehensive analysis of movement patterns,sedimentary environment and micro-topography has been made to investigate the paleoseismic events along the Zemuhe active fault zone.Combined trenches were excavated near Daqingliangzi,which reveal three palaeoearthquakes with ages of 160a,3100a and 5500~8900a,respectively,and a recurrence interva1of about 3000 years.Sedimentary processes related to strike-slip fault type earthquakes are discussed and a sedimentary model is put forward for strike-slip fault on condition that bulges and reverse scarps were formed at hillside area.

Key words: palaeoearthquake, combined trench, micro-topography, Zemuhe River, sedimentary model

中图分类号: