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从反射地震剖面中认识芦山地区的地壳精细结构和构造

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冯杨洋, 于常青, 范柱国, 宋丽蓉, 梁姗姗, 何俊杰, 梅中锋. 从反射地震剖面中认识芦山地区的地壳精细结构和构造[J]. 地球物理学报, 2016, 59(9): 3248-3259, doi: 10.6038/cjg20160910
引用本文: 冯杨洋, 于常青, 范柱国, 宋丽蓉, 梁姗姗, 何俊杰, 梅中锋. 从反射地震剖面中认识芦山地区的地壳精细结构和构造[J]. 地球物理学报, 2016, 59(9): 3248-3259, doi: 10.6038/cjg20160910
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FENG Yang-Yang, YU Chang-Qing, FAN Zhu-Guo, SONG Li-Rong, LIANG Shan-Shan, HE Jun-Jie, MEI Zhong-Feng. Fine crustal structure of the Lushan area derived from seismic reflection profiling[J]. Chinese Journal of Geophysics (in Chinese), 2016, 59(9): 3248-3259, doi: 10.6038/cjg20160910
Citation: FENG Yang-Yang, YU Chang-Qing, FAN Zhu-Guo, SONG Li-Rong, LIANG Shan-Shan, HE Jun-Jie, MEI Zhong-Feng. Fine crustal structure of the Lushan area derived from seismic reflection profiling[J]. Chinese Journal of Geophysics (in Chinese), 2016, 59(9): 3248-3259, doi: 10.6038/cjg20160910
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从反射地震剖面中认识芦山地区的地壳精细结构和构造

    • 1.

      昆明理工大学国土资源工程学院, 昆明 650093

    • 2. 中国地质科学院地质研究所, 北京 100037

    • 3. 内蒙古自治区地震局赤峰地震台, 赤峰 024000

    • 4. 山东科技大学地球科学与工程学院, 青岛 266510

    • 5. 中国地震台网中心, 北京 100045

    • 6. 中国石油东方地球物理公司吐哈物探处, 哈密 839009

详细信息
    作者简介:

    冯杨洋,女,1987年生,内蒙古自治区地震局助理工程师,昆明理工大学在读研究生,研究方向为活动断裂与地震观测.E-mail:fyy5352088@sina.com

    通讯作者: 于常青,男,1962年生,研究员,长期从事地球物理勘探的研究工作,主要从事地震资料处理解释、地震储层预测及综合评价和深部地球物理研究.E-mail:yucq@tom.com

  • 中图分类号: P315;P542

Fine crustal structure of the Lushan area derived from seismic reflection profiling

    • 1.

      Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China

    • 2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

    • 3. Chifeng seismic station, Seismological Bureau of Inner Mongolia Autonomous Region, Chifeng 024000, China

    • 4. College of Earth science and Engineering, Shandong University of Science and Technology, Shandong 266510, China

    • 5. China earthquakes networks center, Beijing 100045, China

    • 6. Tuha Division, BGP Inc., CNPC, Hami 839009, China

More Information
    Corresponding author: YU Chang-Qing, E-mail: yucq@tom.com

    摘要
  • 采用深地震反射剖面探测，结合地表地质信息，本文对芦山地区的地壳结构、深浅构造和隐伏活动断裂进行了分析.研究结果表明：该区上地壳结构特征清晰，深度约为15 km左右；区内断裂由于受青藏高原向东南方向的推挤和坚硬的四川盆地阻挡的联合作用均属逆冲断裂，其中双石-大川断裂以低角度向深部延伸，主要表现为纯逆冲的运动学性质，并与周边小断裂共同组成叠瓦状断层构造.而广元-大邑断裂为上陡下缓式逆冲断裂，与其六条分支断裂共同组成了“正花状”构造，断裂活动是以逆冲为主，并伴随着小的水平滑动，是一条斜向逆冲的断裂.在芦山地震发震断裂的2 km范围内推测存在一陡一缓两条断裂，并根据三者形态推测其在18 km或以上收敛到一起并向深部延伸，从而使它们在芦山地震中被同时激活.研究结果揭示了研究区近地表活动断裂和地壳深部构造之间的关系，为进一步研究龙门山断裂带的深部构造环境、深浅构造关系以及断裂的活动性提供了有利的依据.
    A deep seismic reflection profiling was collected to probe the fine crustal structure of the Lushan area, Sichuan Province. The purpose is to reveal the relationship between the shallow and deep structures, and the geometry and kinetics of the blind active faults using the seismic profiling and surface geology. The results show that the crust of the study area is characterized by a distinct structure of upper crust with thickness about 15 km. The nature of the faults is inferred to be thrusting in the region due to the pushing of the crustal material of the Tibetan plateau into the southeast part of the rigid Sichuan basin. The Shuangshi-Dachuan fault stretches from the surface to the deep crust at a low angle, and is dominated by thrusting in a form of imbricate structure with small-scale faults nearby. Whereas the Guangyuan-Dayi fault is of a positive flower structure with a listric shape, consisting of six branches. Its movement is dominated by thrusting with gentle horizontal slip. We also speculated there are two faults, one is with steep dip and another is with gentle dip, 2 km to near the seismogenic fault of the Lushan earthquake. According to the forms of the three faults, we suggested that they convergence at the depth of 18 km and extend downward, and were activated during the occurrence of the Lushan earthquake. The results reveal the relationship between the subsurface active faults and the deep crustal structure, which would shed a light on the further research of the deep structure, the relationship between shallow and deep structures, and the fault activity of the whole Longmenshan fault zone.
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