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Using the teleseismic waveform data recorded by the seismic station Bachu( hereafter referred to as station BCH) i n the Tarim Basin and the seismic station Taxkorgan(h ereafter referred to as station TAG) i n the west Kunlun Mountains for years,we applied the receiver function H-κ stacking method to study the crustal structure beneath stations BCH and TAG. The results showed that there are obvious differences in the crustal thickness beneath stations BCH and TAG,and the regional crustal thickness and terrain have a very good corresponding relationship. There are high crustal average V P/ V S values beneath the two stations. The crustal thickness is 44 km,and the crustal average wave velocity ratio is 1. 849 beneath station BCH. There is a sharp discontinuity in the middle of the crust beneath station BCH at a depth of 21 km. There is a low average P wave velocity and low V P/ V S from the surface to the discontinuity beneath station BCH.The depth of the discontinuity is consistent with the lower interface of the focal depth from accurate location in the Jiashi earthquake source area adjacent to station BCH; and may be the crustal brittle-ductile conversion boundary. The crustal thickness is 69 km,and the crustal average wave velocity ratio is 1. 847 beneath station TAG,a thicker crust and high V P/ V S may indicate that materials in the lower crustal are prone to plastic flow,which is responsible for the thickening of the crust. 相似文献
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利用位于新疆塔里木盆地的巴楚地震台(BCH)和西昆仑山区的塔什库尔干地震台(TAG)多年记录的高质量远震波形数据,应用接收函数H-k叠加方法研究了台站下方的地壳结构。研究结果显示,BCH和TAG地震台下方地壳厚度差异分明,区域地壳厚度与地形有很好的对应关系;两个台都具有高的地壳平均波速比Vp/Vs值。BCH台下方的地壳厚度为44km、地壳内的平均波速比为1.849,在该台地壳中部21km处存在清晰的间断面,该间断面内存在低的平均P波波速和作/K值,该间断面的深度与邻近巴楚台的伽师震源区的精确定位的震源深度下界面一致,可能为地壳内的脆.韧转换带。TAG台下方的地壳厚度为69km,地壳内的平均波速比为1.847,较厚的地壳和高波速比可能表明该台下地壳的物质易于发生塑性流动,为地壳的变形和增厚创造了条件。 相似文献
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2016年12月8日,新疆呼图壁县发生6.2级地震,造成3人轻伤。地震灾区主要涉及昌吉回族自治州昌吉市、呼图壁县、玛纳斯县等市、县的共25个乡、镇(团场)及呼图壁县城、玛纳斯县城等城市的部分区域,灾区面积12450km2。本文在概述震区地震构造环境及地貌特点的基础上,依据《地震现场工作(第4部分):灾害直接损失评估》等规范,介绍了各结构类型房屋和生命线系统的破坏情况及震区地震地质灾害的类型,分析表明此次地震直接经济损失以土木结构和砖木结构的破坏为主,安居富民工程在地震中起到了关键的减灾作用。 相似文献
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