Rain and small earthquakes maintain a slow-moving landslide in a persistent critical state

Noélie Bontemps (), Pascal Lacroix, Eric Larose, Jorge Jara and Edu Taipe
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Noélie Bontemps: Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre
Pascal Lacroix: Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre
Eric Larose: Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre
Jorge Jara: École Normale Supérieure, CNRS, UMR 8538, PSL Research University
Edu Taipe: OVI-INGEMMET

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract In tectonically active mountain belts, landslides contribute significantly to erosion. Statistical analysis of regional inventories of earthquake-triggered-landslides after large earthquakes (Mw > 5.5) reveal a complex interaction between seismic shaking, landslide material, and rainfall. However, the contributions of each component have never been quantified due to a lack of in-situ data for active landslides. We exploited a 3-year geodetic and seismic dataset for a slow-moving landslide in Peru affected by local earthquakes and seasonal rainfalls. Here we show that in combination, they cause greater landslide motion than either force alone. We also show the rigidity of the landslide’s bulk clearly decreasing during Ml ≥ 5 earthquakes. The recovery is affected by rainfall and small earthquakes (Ml

Date: 2020
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DOI: 10.1038/s41467-020-14445-3

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