地震地质 ›› 2006, Vol. 28 ›› Issue (2): 161-178.

• 研究论文 •    下一篇

南天山地区巴楚-伽师地震(MS6.8)发震构造初步研究

徐锡伟1, 张先康2, 冉勇康1, 崔效锋3, 马文涛1, 沈军4, 杨晓平1, 韩竹军1, 宋方敏1, 张兰凤1   

  1. 1. 中国地震局地质研究所, 北京, 100029;
    2. 中国地震局地球物理勘探中心, 郑州, 450003;
    3. 中国地震局地壳应力研究所, 北京, 100085;
    4. 新疆维吾尔自治区地震局, 乌鲁木齐, 830011
  • 收稿日期:2006-05-16 修回日期:2006-06-03 出版日期:2006-06-08 发布日期:2009-08-27
  • 作者简介:徐锡伟,男,1962年生,1989年在国家地震局地质研究所获得构造地质学博士学位,研究员,博士生导师,主要从事活动构造学、地震地质学和地震灾害学等方面的研究,电话:010-62009025,E-mail:xiweixu@vip.sina.com.
  • 基金资助:
    中国地震局“新疆巴楚-伽师6.8级地震应急工作专项计划”项目资助。

THE PRELIMINARY STUDY ON SEISMOTECTONICS OF THE 2003 AD BACHU-JIASHI EARTHQUAKE (MS 6.8), SOUTHERN TIAN SHAN

XU Xi-wei1, ZHANG Xian-kang2, RAN Yong-kang1, CUI Xiao-feng3, MA Wen-tao1, SHEN Jun4, YANG Xiao-ping1, HAN Zhu-jun1, SONG Fang-min1, ZHANG Lan-feng1   

  1. 1. Institute of Geology, China Earthquake Administration, Beijing 100029, China;
    2. Geophysical Exploration Center, China Earthquake Administration, Zhengzhou 450003, China;
    3. Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;
    4. Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011, China
  • Received:2006-05-16 Revised:2006-06-03 Online:2006-06-08 Published:2009-08-27

摘要: 新生代期间强烈而持久的再生造山作用,在天山地区形成了大量近EW向逆断裂-褶皱带,引起地壳强烈缩短,穿插有NW向“类转换断层”,显示出天山地区近NS向不均匀的构造挤压作用;区域上地震构造主要为近EW向逆断裂-褶皱带或盲逆断层,其次为NW向“类转换断层”。巴楚-伽师地震区位于南天山柯坪塔格推覆构造系以南,NE向跨越极震区、长约50km的深地震反射探测表明,1997年伽师强震群的发震构造推测为NW向隐伏“类转换断层”,2003年巴楚-伽师地震(MS6.8)的发震构造为柯坪塔格推覆构造系南缘尚未出露地表的近EW向盲逆断层系。

关键词: 巴楚-伽师地震, 深地震反射探测, 发震构造, 天山

Abstract: Owing to strong and permanent Cenozoic re-orogenic processing, a lot of EW-striking active thrusts and folds have been developed in Tian Shan, resulting in crustal shortening in NS direction. There also exist NW-striking transform-like strike-slip faults that cut the Tian Shan and accommodate uneven crustal shortening larger in the west and smaller in the east. The seismogenic structures in and around the Tian Shan mainly include EW-striking thrust ramps or blind thrusts and NW-striking transform-like strike-slip faults. The 2003 AD Bachu-Jiashi earthquake is located at south of the Kalpintag nappe. A NE-trending deep seismic reflection profile about 50km long across the epicenter has been conducted after the earthquake. From this reflection profile four blind faults are identified. Together with earthquake relocation, these identified blind faults are used in the paper to interpret the seismogenic structures of the 1997 AD Jiashi strong earthquake swarm and 2003 AD Bachu-Jiashi earthquake. The 1997 AD Jiashi strong earthquakes were generated mainly by a NW-striking buried transform-like strike-slip fault, while the 2003 AD Bachu-jiashi earthquake by blind thrusts in front of the Kalpintag nappe.

Key words: Bachu-Jiashi earthquake, deep seismic reflection profiling, seismogenic structure, Tian Shan

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