Deep learning reveals one of Earth's largest landslide terrain in Patagonia
- Hundreds of basaltic plateau margins east of the Patagonian Cordillera are undermined by numerous giant slope failures. However, the overall extent of this widespread type of plateau collapse remains unknown and incompletely captured in local maps. To detect giant slope failures consistently throughout the region, we train two convolutional neural networks (CNNs), AlexNet and U-Net, with Sentinel-2 optical data and TanDEM-X topographic data on elevation, surface roughness, and curvature. We validated the performance of these CNNs with independent testing data and found that AlexNet performed better when learned on topographic data, and UNet when learned on optical data. AlexNet predicts a total landslide area of 12,000 km2 in a study area of 450,000 km2, and thus one of Earth's largest clusters of giant landslides. These are mostly lateral spreads and rotational failures in effusive rocks, particularly eroding the margins of basaltic plateaus; some giant landslides occurred along shores of former glacial lakes, but are least prevalentHundreds of basaltic plateau margins east of the Patagonian Cordillera are undermined by numerous giant slope failures. However, the overall extent of this widespread type of plateau collapse remains unknown and incompletely captured in local maps. To detect giant slope failures consistently throughout the region, we train two convolutional neural networks (CNNs), AlexNet and U-Net, with Sentinel-2 optical data and TanDEM-X topographic data on elevation, surface roughness, and curvature. We validated the performance of these CNNs with independent testing data and found that AlexNet performed better when learned on topographic data, and UNet when learned on optical data. AlexNet predicts a total landslide area of 12,000 km2 in a study area of 450,000 km2, and thus one of Earth's largest clusters of giant landslides. These are mostly lateral spreads and rotational failures in effusive rocks, particularly eroding the margins of basaltic plateaus; some giant landslides occurred along shores of former glacial lakes, but are least prevalent in Quaternary sedimentary rocks. Given the roughly comparable topographic, climatic, and seismic conditions in our study area, we infer that basalts topping weak sedimentary rocks may have elevated potential for large-scale slope failure. Judging from the many newly detected and previously unknown landslides, we conclude that CNNs can be a valuable tool to detect large-scale slope instability at the regional scale. However, visual inspection is still necessary to validate results and correctly outline individual landslide source and deposit areas.…
Author details: | Elisabeth SchönfeldtORCiDGND, Diego Winocur, Tomáš PánekGND, Oliver KorupORCiDGND |
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DOI: | https://doi.org/10.1016/j.epsl.2022.117642 |
ISSN: | 0012-821X |
ISSN: | 1385-013X |
Title of parent work (English): | Earth & planetary science letters |
Publisher: | Elsevier |
Place of publishing: | Amsterdam [u.a.] |
Publication type: | Article |
Language: | English |
Date of first publication: | 2022/09/01 |
Publication year: | 2022 |
Release date: | 2024/04/05 |
Tag: | Patagonia; convolutional neural network; landslide detection |
Volume: | 593 |
Article number: | 117642 |
Number of pages: | 13 |
Funding institution: | DFG International Research Training Group StRATEGy (Surface Processes,; Tectonics and Geo-resources: The Andean foreland basin of Argentina); [STR 373/34-1]; State of Brandenburg, Germany; German-Argentine; University Network (DAHZ/CUAA); Czech Science Foundation [19-16013S] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Umweltwissenschaften und Geographie |
Peer review: | Referiert |
License (German): | Keine öffentliche Lizenz: Unter Urheberrechtsschutz |