REMOTE SENSING EVIDENCE OF THE SOUTH SEGMENT OF LONGMENSHAN FAULT ZONE EXTENDING TO SOUTHWEST AND ITS SEISMIC GEOLOGICAL SIGNIFICANCE
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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。Abstract: Combining remote sensing imagery interpretation of active faults with Landsat ETM, Google Earth and ASTER GDEM image data, this paper analysed the spatial distribution and geometry and motion characteristics of the south section of Longmenshan tectonic belt. The results showed that Longmenshan tectonic belt occurred obvious fracture dispersion in the process of extending to the south. The tectonic zone gradually widened, developing 5 faults and many secondary faults. The southernmost of Longmenshan tectonic zone was stopped by Xianshuihe sinistral strike-slip fault. Activities of Luding fault, Tianquan fault, Lushan fault and Dayi-Mingshan fault are more obvious. The former two are south-extending branches of Beichuan-Yingxiu fault, the latter two are south-extending branches of Anxian-Guanxian fault. The tectonic deformation of south Longmenshan tectonic belt was dispersed to a plurality of secondary faults, resulting in surface activity signs of single fault weaken significantly. So the potential earthquake frequency and intensity of single fault will also be correspondingly smaller, but potential seismic source region will be more dispersed. According to the existing seismic geological data, we should pay attention to the crustal stability and strong earthquake risk in Ya'an and Luding areas in the future.
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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
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 NE 78 右旋走滑 弱 断层三角面和雁列状冲沟,冲沟右旋错动 F1-2 耿达断裂 NNE 26 右旋走滑 极弱 水系向右偏转 F1-3 硗碛断裂 NEE 35 右旋走滑 极弱 影像特征不明显 F1-4 城墙岩断裂 E 39 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 NE 26 右旋走滑 极弱 影像特征不明显 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 NE 35 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 NE 24 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—NNE 168 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—NEE 49 右旋走滑 中等 西河发生明显偏移,偏移量高达6.4±0.5 km 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—NNE 172 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 NE 30 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 NNE 30 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 NE 21 右旋走滑 极弱 断层崖发育,水系右旋错动 F3-5 永河断裂 NE 28 右旋走滑 极弱 断裂沿线性沟谷发育 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—NE 115 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—N 133 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 -
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