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前人对野马河—大雪山断裂肃北段的晚第四纪活动特征研究相对薄弱,缺少有关断层最新活动的证据。本文在高分辨率遥感解译的基础上,对肃北断裂开展全段1∶5 000的地质地貌填图,通过探槽开挖、放射性碳(~(14)C)测年以及低空无人机摄影测量(small Unmanned Aerial Vehicles,简称sUAV)等工作,对该断裂晚第四纪活动性进行系统研究。发现肃北断裂为一条全新世的逆冲活动断裂,晚第四纪以来具有多期活动,西水沟探槽剖面揭示出2次古地震事件,古地震离逝时间为(4 192.5±97.5)a B.P.之后。 相似文献
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玉龙雪山位于云南省丽江市玉龙纳西族自治县,是北半球最南的大雪山,是云南亚热带的极高山地,也是横断山脉沙鲁里山南段的名山,主峰扇子陡海拔5596米。玉龙雪山从山脚河谷到峰顶拥有亚热带、温带到寒带的完整垂直自然景观,远望如同一条银白色的巨龙并因此得名。玉龙雪山是纳西族及丽江各民族心目中一座神圣的山,她是纳西族保护神"三朵"的化身。 相似文献
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"Red Beds" of Yunnan 总被引:2,自引:0,他引:2
正 The extensive development of the so-called 'Red Beds" in Central andWestern Yunnan was first made known through the different reports of J. 相似文献
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为了研究四川省筠连矿区大雪山矿段的地质构造条件对该区煤层赋存条件的影响,本文论述了该矿段地质构造的方向、展布距离、产状、影响范围等,并通过简要的构造应力分析,论证了该矿段地质构造对煤层的影响进行。总体来看,该区构造复杂程度中等,褶皱、断层不发育,隐伏断层较发育,切割浅部煤层,对深部煤层影响不大。 相似文献
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石冰川是一种发育在高寒山区的典型冰缘地貌,其发育、分布和运动特征对高山多年冻土的状态和演化具有指示性意义。针对光学遥感影像解译难以定量判定石冰川活动状态的难题,本文联合时序合成孔径雷达干涉测量和光学遥感影像地貌解译进行石冰川探测和识别,在大雪山南段编目了860条石冰川,并统计了其关键地貌和活动参数。结果显示,研究区内石冰川由南向北分布逐渐集中,表明区域北部冰缘环境更有利于石冰川的发育;区域内石冰川发育的海拔范围在3 638~5 107 m之间,74%石冰川朝向西、西北、北、东北方向发育;97%石冰川的年均形变速率小于100 mm·a-1,并且北部区域石冰川的活动性相较于其他区域更强。基于石冰川面积与含冰量之间的经验关系模型,初步估计研究区石冰川储水量为0.963~1.445 km3。本文研究成果可为进一步开展青藏高原东南缘石冰川的时空演化规律、水文和灾害效应提供重要基础数据。 相似文献
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The Holocene Activity Evidence of the Yema River-Daxue Mountain Fault in Western Qilian Mountain 总被引:2,自引:0,他引:2
Altyn Tagh fault controls the deformation characteristics of the northern margin of the Qinghai-Tibet Plateau.The sinistral slip rate of the eastern segment of the fault reduces gradually where the reduction transforms into the deformation within Qilian Mountain,forming a series of thrust faults and strike-slip faults.Among them,the Yema River-Daxue Mountain fault is one of the important structural transform faults in the study area.Based on the differences of the geometrical characteristics and activities,the fault is divided into four segments,the Yema River segment,the Shibandun segment,the Liushapo segment and the Baishitougou segment,among which the former three are Holocene active faults,and the Baishitougou segment belongs to late Pleistocene fault.The excavated trenches imply a total of 6 paleoearthquake events,and at least 4 events have occurred during Holocene,whose occurrence times are 8300±700 yr BP,6605±140 yr BP,4540±350 yr BP,2098±47 yr BP,respectively.The recurrence interval is 2600±600 yr BP that is close to the lapsed time of the last one,2098±47 yr BP,which suggests that the Yema River-Daxue Mountain fault is in a high risk of major earthquakes in the future.The vertical coseismic displacements of the four Holocene paleoearthquake events are 100 cm,42 cm,40 cm and 50 cm,respectively,the horizontal coseismic displacements are 5 m,4.5-5.5 m,5-8 m and 4-5.5 m,separately,and then the reference magnitude of the paleoearthquake events is conjectured to be M7.6±0.1. 相似文献