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Terminology and Strategy to Describe Large Volcanic Landslides and Debris Avalanches

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Volcanic Debris Avalanches

Part of the book series: Advances in Volcanology ((VOLCAN))

Abstract

Large volcanic landslides and debris avalanches are rapid, water unsaturated, gravity-driven mass movements produced by the failure of one (or more) portion(s) of a volcanic edifice. In this chapter, we evaluated the current terminology used to describe this phenomenon. We propose a descriptive scheme based on metrics and geological features that allows us to extract significant information from both the source area and the deposit. The landslide scar is a breached depression in the volcanic edifice with steep walls, and the debris avalanche deposit is an epiclastic, unsorted, heterogeneous and heterometric breccia, composed of pieces of the edifice source, the transport path, and sometimes the basement/substratum of the volcano. Typical structures, such as jigsaw cracks and hummocky topography, along with some rarer descriptive elements are illustrated with numerous examples. This work aims to improve field analysis and remote sensing and to enhance comparative studies between different events around the world.

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Acknowledgements

The authors thank Alexander Belousov and Mathieu Kervyn for their thoughtful reviews that helped improve the original manuscript. The authors also thank Lee Siebert for his help in clarifying some concepts and for being always open to discuss this topic. BB also acknowledges that this manuscript includes ideas he developed during its Ph.D. under the direction of Benjamin van Wyk de Vries, which is sincerely thanked.

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Correspondence to Benjamin Bernard .

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Bernard, B., Takarada, S., Andrade, S.D., Dufresne, A. (2021). Terminology and Strategy to Describe Large Volcanic Landslides and Debris Avalanches. In: Roverato, M., Dufresne, A., Procter, J. (eds) Volcanic Debris Avalanches. Advances in Volcanology. Springer, Cham. https://doi.org/10.1007/978-3-030-57411-6_3

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