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地震 ›› 2010, Vol. 30 ›› Issue (1): 131-137.

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祁连山活动断裂带中东段冷龙岭断裂滑动速率的精确厘定

何文贵1,2, 袁道阳1,2, 葛伟鹏1,2, 罗浩1,2   

  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兰州科技创新基地, 甘肃 兰州 730000
  • 收稿日期:2009-06-23 修回日期:2009-09-21 出版日期:2010-01-31 发布日期:2021-10-15
  • 作者简介:何文贵(1963-), 男, 吉林白城人, 正研级高工, 主要从事地震地质和活动构造等研究。
  • 基金资助:
    中国地震局地震联合基金(104073)资助; 中国地震局兰州地震研究所论著编号: LC200900

Determination of the Slip Rate of the Lenglongling Fault in the Middle and Eastern Segments of the Qilian Mountain Active Fault Zone

HE Wen-gui1,2, YUAN Dao-yang1,2, GE Wei-peng1,2, LUO Hao1,2   

  1. 1. Lanzhou Institute of Seismology, CEA, Lanzhou 730000, China;
    2. Lanzhou Base of the Institute of Earthquake Science, CEA, Lanzhou 730000, China
  • Received:2009-06-23 Revised:2009-09-21 Online:2010-01-31 Published:2021-10-15

摘要: 冷龙岭活动断裂是青藏高原东北缘祁连山断裂带的重要组成部分, 位于祁连山断裂带中东段。 根据野外考察结果认为, 该断裂全新世以来活动强烈, 主要表现为左旋走滑运动, 并伴有正倾滑性质, 断错地貌特征明显。 通过高分辨率SPOT卫星数字影像和大比例尺航空照片处理确定断层的位置, 利用断错地貌测图、 热释光(TL)和碳十四(14C)测年方法, 厘定了冷龙岭断裂的晚第四纪滑动速率, 冷龙岭断裂晚更新世以来的平均水平滑动速率为(4.3±0.7)mm/a, 全新世晚期以来的平均水平滑动速率为(3.9±0.36)mm/a。

关键词: 祁连山断裂带, 冷龙岭断裂, 滑动速率, 活动断裂

Abstract: Located in the middle and eastern segments of the Qilian Mountain active fault zone, Lenglongling active fault is an important part of the Qilian Mountain fault zone in the northeastern margin of the Tibetan plateau. Based on field investigation, we found that the fault has been intensely acting since Holocene, mainly represented by left-lateral strike-slip movement with normal dip-slip, and obvious dislocated geomorphological features. The location of faults was determined by processing the high-resolution SPOT satellite digital images and large-scale aerial photos. Using the dislocated geomorphological plotting, thermoluminescence (TL) and carbon 14 (14C) dating, the late Quaternary slip-rate of the Lenglongling fault was accurately determined. The average horizontal slip-rate of the Lenglongling fault has been (4.3 ± 0.7) mm / a since the late Pleistocene, and (3.9 ± 0.36) mm / a since the late Holocene.

Key words: Qilian mountain fault zone, Lenglongling fault, Slip-rate, Active fault

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