Observations of Landslides Caused by the April 2015 Gorkha, Nepal, Earthquake Based on Land, UAV, and Satellite Reconnaissance
Observations of Landslides Caused by the April 2015 Gorkha, Nepal, Earthquake Based on Land, UAV, and Satellite Reconnaissance
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DOI：
10.1193/121616eqs237m
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发表时间：
2017-12
影响因子：
5
通讯作者：
D. Zekkos;M. Clark;M. Whitworth;W. Greenwood;A. West;K. Roback;Gen K. Li;D. Chamlagain;
中科院分区：
文献类型：
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作者：
D. Zekkos;M. Clark;M. Whitworth;W. Greenwood;A. West;K. Roback;Gen K. Li;D. Chamlagain;
2015年4月尼泊尔戈尔卡地震期间，发生了数千起山体滑坡。之前的工作使用卫星图像绘制了近25,000个同震滑坡。在这项研究中，对布迪·甘达基、特里舒利和因德拉瓦蒂河谷这三个也进行了现场部署的地区进行了基于卫星的地图分析，以更好地描述山体滑坡的特征。无人驾驶飞行器(UAV)被部署使用摄影测量来绘制失稳斜坡的三维(3-D)几何图形，以及表征岩石结构和强度。大多数滑坡是沿山脊和盆地较陡峭部分的岩石滑坡，主要涉及风化岩带。其他山体滑坡包括岩石坠落和土壤崩塌。卫星图像分析表明，滑坡集中在地形过渡带以北、陡峭地区和靠近主要河流的地方。就滑坡数量而言，Trishuli地区的滑坡密度比Budhi Gandaki和Indraati地区最低，尽管这三个地区在总滑坡面积和其他滑坡统计数据方面的密度相似。
Thousands of landslides occurred during the April 2015 Gorkha earthquake in Nepal. Previous work using satellite imagery mapped nearly 25,000 coseismic landslides. In this study, the satellite-based mapping was analyzed in three areas where field deployment was also conducted—the Budhi Gandaki, Trishuli, and Indrawati river valleys—to better characterize the landslides. Unmanned aerial vehicles (UAVs) were deployed to map the three-dimensional (3-D) geometry of failed slopes using photogrammetry, as well as to characterize rock structure and strength. The majority of landslides were rock slides along the ridges and the steeper portions of the basins primarily involving the weathered rock zone. Additional landslides included rock falls and soil failures. Satellite imagery analysis indicated that landsliding was concentrated north of the physiographic transition, in steep areas, and in close proximity to the major rivers. The Trishuli area experienced the lowest landslide density in terms of number of landslides compared to the Budhi Gandaki and Indrawati areas, although all three areas had similar density in terms of total landslide area and other landslide statistics.