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Mediterranean Alpine populations are particularly exposed tonatural hazards like floods and earthquakes because of both the closeMediterranean humidity source and the seismically active Alpine region.Knowledge of long-term variability in flood and earthquake occurrences is ofhigh value since it can be useful to improve risk assessment and mitigation.In this context, we explore the potential of a lake-sediment sequence fromLago Inferiore de Laures in Valle d'Aosta (Northern Italy) as a long-termrecord of past floods and earthquakes. The high-resolution sedimentologicalstudy revealed 76 event layers over the last ca. 270 years; 8 are interpretedas most probably induced by earthquakes and 68 by flood events. Comparison tohistorical seismic data suggests that the recorded earthquakes are strong(epicentral Medvedev–Sponheuer–Kárník (MSK) intensity of VI–IX) and/or close to the lake (distance of25–120 km). Compared to other lake-sediment sequences, Lago Inferiore deLaures sediments appear to be regionally the most sensitive to earthquakeshaking, offering a great potential to reconstruct the past regionalseismicity further back in time. Comparison to historical and palaeofloodrecords suggests that the flood signal reconstructed from Lago Inferiore deLaures sediments represents the regional and (multi-)decadal variabilityof summer–autumn floods well, in connection to Mediterranean mesoscaleprecipitation events. Overall, our results reveal the high potential of LagoInferiore de Laures sediments to extend the regional earthquake and floodcatalogues far back in time

A multi-centennial record of past floods and earthquakes in Valle d'Aosta, Mediterranean Italian Alps