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地震 ›› 2005, Vol. 25 ›› Issue (4): 119-126.

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西宁城市活动断裂地表特征初步研究

李智敏1, 田勤俭2, 高占武2, 陈立泽3   

  1. 1.中国地震局兰州地震研究所, 甘肃 兰州 730000;
    2.中国地震局地震预测研究所, 北京 100036;
    3.美国休斯顿大学, 美国 休斯顿
  • 收稿日期:2004-12-20 修回日期:2005-05-13 出版日期:2005-10-31 发布日期:2021-11-10
  • 作者简介:李智敏(1977-), 男, 甘肃庄浪县人, 2002年在读硕士研究生, 现主要从事构造地质学等研究。
  • 基金资助:
    中国数字地震观测网络工程城市活断层探测项目资助

Study of the surficial features of the active faults in Xining City

LI Zhi-min1, TIAN Qin-Jian2, GAO Zhan-wu2, CHEN Li-ze2   

  1. 1. Earthquake Research Institute of Lanzhou, CEA, Lanzhou 730000;
    2. Institute of Earthquake Science, CEA, Beijing 100036, China
  • Received:2004-12-20 Revised:2005-05-13 Online:2005-10-31 Published:2021-11-10

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摘要： 在详细的野外地质调查基础上, 通过开挖探槽剖面揭露了断层的基本性质, 初步展示了西宁市北川河东岸断裂、 南川河断裂和湟水河断裂的地表特征。 结合前人的阶地测定年代结果初步判断, 北川河东岸断裂错断相当于湟水河Ⅱ至Ⅲ级阶地, Ⅱ级阶地形成不晚于0.05 Ma, Ⅲ级阶地形成不晚于0.12 Ma, 说明该断裂是晚更新世活动断裂; 南川河断裂错断相当于湟水河Ⅳ、 Ⅴ级阶地, Ⅳ级阶地形成不晚于0.54 Ma, Ⅴ级阶地形成不晚于0.78 Ma, 说明该断裂是早中更新世活动断裂; 湟水河断裂错断其Ⅱ、 Ⅲ级阶地砾石层, 说明该断裂是晚更新世活动断裂。 这些断裂规模小、 活动性弱, 可能为盖层断裂。

关键词: 活动断裂, 西宁城市, 探槽剖面, 地表特征

Abstract: In this paper, on the basis of detailed field geological survey, the features of the faults revealed by digging trenches, the surficial features of faults at the eastern side of Beichuan River, Nanchuan River and Huangshui River in Xining City are presented. Through the previous thermo-luminescent dating, we find that the fault at eastern side of Beichuan River cut the second-order to third-order terraces crossed by fault; the third-order terraces formed 0.12 Ma ago. It shows that this fault has been not active since late Pleistocene; Nanchuan River fault cut the four-order to fifth-order terraces crossed by fault, the four-order terraces formed 0.54 Ma ago. It shows that this fault has been not active since early Pleistocene; Huangshui River fault cut the second-order to third-order terraces crossed by fault. It shows that this fault has been not active since late Pleistocene. Small scale and weak activity of those faults show that they possibly belong to superficial faults.

Key words: Active fault, Xining City, Cross-section of trench, Surface features

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