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龙门山构造带南段向西南延伸的遥感影像证据及地震地质意义

马晓雪 吴中海 李家存 周春景 李凯 王继龙

马晓雪, 吴中海, 李家存, 等, 2016. 龙门山构造带南段向西南延伸的遥感影像证据及地震地质意义. 地质力学学报, 22 (3): 548-567.
引用本文: 马晓雪, 吴中海, 李家存, 等, 2016. 龙门山构造带南段向西南延伸的遥感影像证据及地震地质意义. 地质力学学报, 22 (3): 548-567.
MA Xiao-xue, WU Zhong-hai, LI Jia-cun, et al., 2016. REMOTE SENSING EVIDENCE OF THE SOUTH SEGMENT OF LONGMENSHAN FAULT ZONE EXTENDING TO SOUTHWEST AND ITS SEISMIC GEOLOGICAL SIGNIFICANCE. Journal of Geomechanics, 22 (3): 548-567.
Citation: MA Xiao-xue, WU Zhong-hai, LI Jia-cun, et al., 2016. REMOTE SENSING EVIDENCE OF THE SOUTH SEGMENT OF LONGMENSHAN FAULT ZONE EXTENDING TO SOUTHWEST AND ITS SEISMIC GEOLOGICAL SIGNIFICANCE. Journal of Geomechanics, 22 (3): 548-567.

龙门山构造带南段向西南延伸的遥感影像证据及地震地质意义

基金项目: 

中国地质调查局地质调查项目 12120114002101

中国地质调查局地质调查项目 DD20160268

国家自然科学基金项目 41571013

国家自然科学基金项目 41171009

详细信息
    作者简介:

    马晓雪(1991-), 女, 硕士研究生, 主要从事3S技术与地学应用研究。E-mail:mxx120591@sina.com

    通讯作者:

    吴中海(1974-), 男, 博士, 研究员, 主要从事新构造和活动构造研究。E-mail:wzhh4488@sina.com

  • 中图分类号: P627;P315.2

REMOTE SENSING EVIDENCE OF THE SOUTH SEGMENT OF LONGMENSHAN FAULT ZONE EXTENDING TO SOUTHWEST AND ITS SEISMIC GEOLOGICAL SIGNIFICANCE

  • 摘要: 在系统总结活动断裂遥感影像解译标志的基础上,利用Landsat ETM、Google Earth及ASTER GDEM等影像资料,结合前人研究成果,重点分析了龙门山构造带南段主要活动断裂的空间展布及几何学与运动学特征。研究结果表明,龙门山构造带在向南延伸过程中发生了明显的断裂分散现象,整个断裂带逐渐展宽,主要包括5条断裂带且其中包含多条次级断裂,至最南端被北西向鲜水河左旋走滑断裂带阻挡。其中活动性较为明显的断裂自西向东主要有4条:泸定断裂、天全断裂、芦山断裂和大邑-名山断裂,前两者是北川-映秀断裂的南延分支,而后两者是安县-灌县断裂的南延部分。由于龙门山构造带南段的构造变形被分解至多条次级断裂上,导致单条断裂错断地表的活动迹象明显变弱,因此单条断裂的潜在发震频率和强度也将相应变小,但潜在震源区会更为分散。结合已有的地震地质资料认为,未来应注意泸定和雅安2个地区的地壳稳定性及未来强震危险性问题。

     

  • 图  1  龙门山断裂带及邻区地质简图和地层剖面[26]

    Pc-前寒武系; Z-新元古系(震旦系); Pz-古生界; T-三叠系; J-侏罗系; K-白垩系; E-始新统; 红线为新生代断裂

    Figure  1.  Simplified geologic map and stratigraphic profiles of the Longmenshan fault zone and its adjacent region

    图  2  龙门山断裂带南段地震烈度图

    (数据来源:中国地震信息网http://www.csi.ac.cn/publish/main/837/1074/index.html)

    Figure  2.  Earthquake intensity map of the southern segment of Longmenshan fault zone

    图  3  龙门山断裂带南段活动断裂研究现状与地震分布图(ASTER GDEM)[27~30]

    Figure  3.  Active faults and earthquakes in the southern segment of Longmenshan fault zone (ASTER GDEM)

    图  4  龙门山断裂带南段几何展布及地震分布图(ETM7)

    Figure  4.  Geometric distribution of the south segment of Longmenshan fault zone and earthquake distribution(ETM7)

    图  5  卧龙—硗碛断裂带几何展布及错断地貌特征

    Figure  5.  Geometric distribution of Wolong-Yaoji fault zone and and features of displacing landforms

    图  6  泸定断裂带的几何展布及错断地貌特征

    Figure  6.  Geometric distribution of Luding fault zone and features of dislocation landforms

    图  7  天全断裂带的几何展布及地貌特征

    Figure  7.  Geometric distribution of Tianguan fault zone and its landform features

    图  8  芦山断裂和大邑-名山断裂的几何展布及错断地貌特征

    Figure  8.  Geometric distribution of Lushan and Dayi-Mingshan faults and their dislocation landform features

    图  9  龙门山断裂带南段主要活动断裂的延伸

    Figure  9.  Extension of the major active faults in the south segment of Longmenshan fault zone

    图  10  龙门山断裂带南段的三维结构与芦山7.0地震发震构造示意图

    Figure  10.  A model map showing the three-dimensional structure of the southern section of LongmenShan fault zone and seismogenic structures associated with the Ms7.0 Lushan earthquake

    表  1  卧龙-硗碛断裂带主要断裂参数及遥感标志

    Table  1.   The major activity faults' parameters and remote sensing marks in Wolong-Yaoji fault

    断裂带编号断裂名称走向长度/km性质活动性遥感标志
    耿达—陇东断裂带F1-1卧龙断裂NE78右旋走滑断层三角面和雁列状冲沟,冲沟右旋错动
    F1-2耿达断裂NNE26右旋走滑极弱水系向右偏转
    F1-3硗碛断裂NEE35右旋走滑极弱影像特征不明显
    F1-4城墙岩断裂E39右旋走滑极弱断层三角面和雁列状冲沟,冲沟向右偏转
    F1-5中岗断裂NE26右旋走滑极弱影像特征不明显
    下载: 导出CSV

    表  2  泸定断裂带主要断裂参数及遥感标志

    Table  2.   The major fault parameters and remote sensing marks in Luding fault zone

    编号断裂名称走向长度/km性质活动性遥感标志
    F2-1水磨断裂NE35右旋走滑中等断裂沿沟谷延伸,断层陡坎发育
    F2-2三江断裂NE24右旋走滑极弱发育一系列断层崖和断层三角面
    F2-3泸定断裂NE—NNE168右旋走滑中等大渡河发生明显偏移,偏移量高达4.7±0.5 km,山脊错动
    F2-4宝兴断裂NE—NEE49右旋走滑中等西河发生明显偏移,偏移量高达6.4±0.5 km
    下载: 导出CSV

    表  3  天全断裂带主要断裂参数及遥感标志

    Table  3.   The major fault parameters and remote sensing marks in Tianguan fault zone

    编号断裂名称走向长度/km性质活动性遥感标志
    F3-1天全断裂NE—NNE172右旋走滑中等断裂沿线性沟谷展布,断裂谷发育,断裂切割河流谷坡形成断层崖、断层沟槽及垭口
    F3-2飞水断裂NE30右旋走滑极弱无明显错断现象,断裂行迹不清晰
    F3-3大川断裂NNE30右旋走滑极弱沿断裂发育一排整齐的断裂谷,断裂两侧地貌差异明显
    F3-4双石断裂NE21右旋走滑极弱断层崖发育,水系右旋错动
    F3-5永河断裂NE28右旋走滑极弱断裂沿线性沟谷发育
    下载: 导出CSV

    表  4  芦山断裂和大邑-名山断裂的参数及遥感标志

    Table  4.   The major fault parameters and remote sensing marks in Lushan fault and Dayi-Mingshan fault

    编号断裂名称走向长度/km性质活动性遥感标志
    F4芦山断裂NNE—NE115逆冲中等断裂两侧地形差异较大,发育雁列状冲沟
    F5大邑—名山断裂E—N133逆冲中等断裂沿盆山边界展布,断裂西侧发育一系列断层三角面和小鼓丘
    下载: 导出CSV
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  • 收稿日期:  2016-03-25
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