地震地质 ›› 2009, Vol. 31 ›› Issue (2): 247-255.DOI: 10.3969/j.issn.0253-4967.2009.02.005

• 研究论文 • 上一篇    下一篇

甘肃高台合黎山南缘发现地震地表破裂带

郑文俊1,2, 张培震1, 袁道阳2, 葛伟鹏2, 刘建辉1   

  1. 1. 中国地震局地质研究所, 地震动力学国家重点实验室, 北京, 100029;
    2. 中国地震局兰州地震研究所, 兰州, 730000
  • 收稿日期:2008-11-11 修回日期:2009-03-04 出版日期:2009-03-11 发布日期:2009-11-27
  • 作者简介:郑文俊,男,1972年生,1997年毕业于西安工程学院(现长安大学)地质矿产勘查专业,2003年在中国地震局兰州地震研究所获得构造地质学硕士学位,现在中国地震局地质研究所在职攻读构造地质学博士学位,副研究员,主要从事活动构造和新构造及构造地貌学方面的研究工作,电话:010-62009114,E-mail:gszhwj@163.com.
  • 基金资助:
    地震科学联合基金(B07007);中国地震局地质研究所基本科研业务专项(DF-IGCEA0607122);地震动力学国家重点实验室基金(LED0606)共同资助

DISCOVERY OF SURFACE RUPTURE ZONE ON THE SOUTH OF HELISHAN IN GAOTAI,GANSU PROVINCE

ZHENG Wen-jun1,2, ZHANG Pei-zhen1, YUAN Dao-yang2, GE Wei-peng2, LIU Jian-hui1   

  1. 1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
    2. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China
  • Received:2008-11-11 Revised:2009-03-04 Online:2009-03-11 Published:2009-11-27

摘要: 据最新野外考察发现,位于河西走廊中段北部的合黎山南缘断裂东段有2条较新的地震地表破裂带遗迹,破裂带长度分别为7km和10km,保存较为完整,认为其为较近的一次地震活动所致。根据该地区历史地震资料和目前该地区的研究程度,该地震地表破裂带可能与2次历史地震(公元180年表氏8级地震、公元756年张掖-酒泉7级地震)中的其中之一或与一次漏记的历史强地震有关。

关键词: 地震破裂带, 合黎山南缘断裂, 青藏高原北部, 甘肃高台

Abstract: According to the new investigation in the northern Hexi corridor,remains of two surface rupture zones are discovered on the southern margin fault of Helishan.One rupture has the length of about 7km and the other about 10km.The two surface rupture zones might be produced by the nearest earthquake event.On the surface rupture zones,there are continuous scarp and free face caused by rupture.The scarp is about 1~1.5m high and on some site is up to 2m nearly.According to the OSL result,the nearest T1 terrace and higher flood plain forming 3000a BP are dislocated by the fault.All above reveal that the rupture age should be later than that of T1 terrace.But in the historical data and earthquake catalogue,we didn't find related information about the fault and surface rupture in this area.The 180 AD M 8 Biaoshi earthquake and 756 AD M 7 Zhangye-Jiuquan earthquake are documented in historical data.It is inferred by textual research that the two earthquakes are related with the northern marginal fault of Yumushan in the south of basin.Due to lack of reliable evidence,there still exist many arguments on this inferred conclusion.So we hold that the two surface rupture zones were produced by one of the two large earthquakes or another unrecorded historical event.The research on the activity and surface rupture of this fault can offer valuable information for the tectonic study and strong earthquake risk estimate of this region in the future.

Key words: surface rupture, the Helishan southern margin fault, the northern Tibet, Gaotai, Gansu

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