Karrat Fjord (Greenland) tsunamigenic landslide of 17 June 2017: initial 3D observations
Karrat Fjord (Greenland) tsunamigenic landslide of 17 June 2017: initial 3D observations
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DOI：
10.1007/s10346-017-0926-4
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发表时间：
2018-02-01
期刊：
影响因子：
6.7
通讯作者：
Giachetti, Thomas
中科院分区：
文献类型：
--
作者：
Gauthier, Dave;Anderson, Scott A.;Giachetti, Thomas
2017年6月17日，由山体滑坡引发的海啸袭击了格陵兰岛Nuugaatsiaq村，造成4人失踪，据推测已死亡。在这里，我们提出了一个初步的高分辨率分析海啸形成的滑坡疤痕基于三维（3D）重建斜航拍照片在失败后侦察直升机飞越。通过与破坏前地形的三维定量比较，我们估计在滑坡期间大约有5800万立方米的岩石和崩积层被动员起来，其中4500万立方米到达了峡湾，导致了破坏性的海啸。我们将这一事件归类为“海啸成因的极快岩石雪崩”，它很可能是沿着一个预先存在的变质构造释放的，它的横向边界是斜坡规模的断层。需要进一步的分析来正确地描述这次滑坡和邻近的不稳定斜坡，并更好地了解海啸的产生。
On 17 June 2017, a landslide-generated tsunami reached the village of Nuugaatsiaq, Greenland, leaving four persons missing and presumed dead. Here, we present a preliminary high-resolution analysis of the tsunamigenic landslide scar based on three-dimensional (3D) reconstructions of oblique aerial photographs taken during a post-failure reconnaissance helicopter overflight. Through a 3D quantitative comparison with pre-failure topography, we estimate that approximately 58 million m(3) of rock and colluvium (talus) was mobilized during the landslide, 45 million m(3) of which reached the fjord, resulting in a destructive tsunami. We classify this event as a "tsunamigenic extremely rapid rock avalanche," which likely released along a pre-existing metamorphic fabric, bounded laterally by slope-scale faults. Further analysis is required to properly characterize this landslide and adjacent unstable slopes, and to better understand the tsunami generation.