Karrat Fjord (Greenland) tsunamigenic landslide of 17 June 2017: initial 3D observations
| Autor: | Dave Gauthier, Thomas Giachetti, Scott A. Anderson, Hermann M. Fritz |
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| Rok vydání: | 2017 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Metamorphic rock Event (relativity) Landslide Fjord 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Natural hazard Geology Seismology 0105 earth and related environmental sciences Colluvium |
| Zdroj: | Landslides. 15:327-332 |
| ISSN: | 1612-5118 1612-510X |
| Popis: | 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 m3 of rock and colluvium (talus) was mobilized during the landslide, 45 million m3 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. |
| Databáze: | OpenAIRE |
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