新疆博罗可努—阿齐克库都克断裂精河段古地震与最新活动时代研究

杨攀新 胡伟华 胡朝忠 孙鑫喆 黄帅堂 郭春杉 陈志华 任金卫

杨攀新,胡伟华,胡朝忠,孙鑫喆,黄帅堂,郭春杉,陈志华,任金卫. 2022. 新疆博罗可努—阿齐克库都克断裂精河段古地震与最新活动时代研究. 地震学报,44(4):644−655 doi: 10.11939/jass.20210040
引用本文: 杨攀新,胡伟华,胡朝忠,孙鑫喆,黄帅堂,郭春杉,陈志华,任金卫. 2022. 新疆博罗可努—阿齐克库都克断裂精河段古地震与最新活动时代研究. 地震学报,44(4):644−655 doi: 10.11939/jass.20210040
Yang P X,Hu W H,Hu C Z,Sun X Z,Huang S T,Guo C S,Chen Z H,Ren J W. 2022. Paleoearthquakes and the latest active age of Jinghe segment of Bolokenu-Aqikekuduk fault. Acta Seismologica Sinica,44(4):644−655 doi: 10.11939/jass.20210040
Citation: Yang P X,Hu W H,Hu C Z,Sun X Z,Huang S T,Guo C S,Chen Z H,Ren J W. 2022. Paleoearthquakes and the latest active age of Jinghe segment of Bolokenu-Aqikekuduk fault. Acta Seismologica Sinica44(4):644−655 doi: 10.11939/jass.20210040

新疆博罗可努—阿齐克库都克断裂精河段古地震与最新活动时代研究

doi: 10.11939/jass.20210040
基金项目: 自然基金重点项目(41730212)和地震局地质研究所基本科研业务专项(2016IES010301) 共同资助
详细信息
    通讯作者:

    杨攀新,博士,副研究员,主要从事活动构造及地震地质研究,e-mail:panxiny@sina.com

Paleoearthquakes and the latest active age of Jinghe segment of Bolokenu-Aqikekuduk fault

  • 摘要: 博罗可努—阿齐克库都克断裂是西天山北西向右旋走滑断裂系中最北端的一条活动断裂,其在中国境内延伸最长。本文在艾比湖西侧及精河县东南侧最新地表形变上开挖两条探槽,进行该断裂古地震的初步研究。根据活动性质差异和断裂截切关系将该断裂分为艾比湖段和精河以东段,在对沉积物光释光年代和地震关系分析的基础上,确定了此两段断裂的最新活动时代均为全新世,初步确定其古地震期次,最新地震事件距今3.7—4.86 ka之间;根据冲沟位错和洪积扇年代测定结果,确定精河以东段的活动速率大于4 mm/a;根据探槽错动至地表,及地表破裂带位置及长度,推测艾比湖段可能为1765年精河M61/2的发震构造,且其震级很有可能被低估,因为艾比湖段的破裂总长度超过60 km,震级极有可能达到M7.0以上。

     

  • 图  1  青藏高原西构造结节和天山地区的构造及强震分布图

    F1: 塔拉斯—费尔干纳断裂; F2: 肯迪克塔什断裂; F3: 博罗可努-阿齐克库都克断裂;F4:温泉—博乐断裂;F5:四棵树—古尔图南断裂

    Figure  1.  Structure of western Syntaxis of Tibet Plateau and Tianshan area and distribution of earthquakes

    F1:Talas-Fergana fault; F2:Kindyktash fault; F3:Bolokenu-Aqikekuduk fault; F4:Wenquan-Bole fault;F5:Sikeshu-Guertunan fault

    图  2  博阿断裂天山以北段的展布影像解译及活动性质

    (a) 博阿断裂总体展布图;(b) 艾比湖西岸断裂影像;(c) 100棵树附近断裂影像;(d) 精河县城断裂影像。图中黄色框为艾比湖段;蓝色框为精河以东段;红色剪头指示形变带。影像来自Google Earth

    Figure  2.  The distribution and activity of the northern Tianshan mountain segment of Bolokenu-Aqikekuduk fault

    (a) The trace of Bolokenu−Aqikekuduk fault;(b) The trace of Aibi lake segment;(c) The trace of 100 trees segment;(d) The trace of Jinghe county. The yellow frame is Aibi lake segment,blue frame is east Jinghe segment,red arrows indicate deformation trace of the fault. The figures are from Google Earth

    图  3  艾比湖西北岸断裂无人机航测合成影像(a)和高程图(b)(图中红色箭头指向断层滑动面)

    Figure  3.  Unmanned aerial vehicle aerial composite image (a) and digital elevation model in the northwest bank of Aibi lake (b)where red arrows indicate fault scarp trace

    图  4  探槽东壁局部照片

    图中红色箭头指向断层迹线,E1E2为地震崩积楔体

    Figure  4.  Splicing photos of east wall of the trench

    The red arrows indicate fault slip face,E1 and E2 are earthquake colluvial wedge

    图  5  探槽西壁拼合照片及局部断裂细节图

    (a) 探槽西壁拼合;(b) 探槽西壁采样分布;(c) 断层带细节。红色剪头指示断层面

    Figure  5.  Splicing photos of west wall of the trench and details of faults section

    (a) Splicing photos of west wall of the trench;(b) The aging sample sites;(c) The details of the fault section. Red arrows indicate fault slip face

    图  6  探槽西壁剖面素描图及样品位置

    Figure  6.  Profile of the western wall of the trench and the location of samples

    图  7  100棵树附近无人机航测DEM及断裂冲沟位错(白色箭头之间为断裂)

    Figure  7.  DEM and dislocation gully by fault near 100 trees (The section between the white arrow is fault trace)

    图  8  (a) 探槽2照片拼接图及OSL年代测试结果;(b) 黄土层中错动细节

    Figure  8.  (a) Splicing photos of trench 2 and dating results of OSL;(b) The location detail in loess

    表  1  艾比湖探槽光释光年代测试结果

    Table  1.   Optically stimulated luminescence dating results of Aibi lake trench

    原始编号埋藏深度/m剂量率/(Gy·ka−1等效剂量/Gy年龄/ka
    ABH-010.25.09±0.2611.14±0.352.19±0.13
    ABH-020.25.31±0.2710.53±0.371.98±0.12
    ABH-030.55.78±0.3312.65±0.412.19±0.14
    ABH-040.54.77±0.129.53±0.152.00±0.06
    ABH-051.24.34±0.1313.21±0.193.04±0.10
    ABH−061.24.49±0.138.73±0.451.95±0.12
    注:样品由北京光释光实验室测定
    下载: 导出CSV

    表  2  探槽2样品测试结果

    Table  2.   Test results of trench 2 sample

    原始编号埋藏深度/m含水率剂量率/(Gy·ka−1等效剂量/Gy年龄/ka
    JH-TC1-010.315%±5%5.22±0.3419.30±0.703.70±0.28
    JH-TC1-020.616%±5%5.16±0.3425.09±0.654.86±0.35
    JH-TC1-030.913%±5%5.50±0.3839.37±0.987.16±0.53
    JH-TC1-042.06%±3%3.44±0.1036.72±0.6910.67±0.38
    JH-TC1-052.36%±3%3.37±0.1034.58±0.4510.26±0.32
    JH-TC1-065.06%±3%3.64±0.1264.53±0.7017.75±0.61
    JH-TC1-077.06%±3%4.09±0.2174.68±2.9918.27±1.20
    JH-TC1-087.96%±3%3.28±0.0958.70±0.5317.88±0.53
    注:样品由北京光释光实验室测定
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-03-22
  • 修回日期:  2021-06-18
  • 网络出版日期:  2022-07-04
  • 刊出日期:  2022-08-16

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