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Past earthquakes triggered large rockslides in the Eastern Alps 16.02.2021 Geologists from the University of Innsbruck shed new light on a long-lasting debate about the trigger mechanism of large rockslides. Lake mud in two Alpine lakes in Tyrol reveal that rare strong earthquakes are the final cause of multiple, prehistoric rockslides in the Eastern Alps. The study has now been published in the Journal Nature Communications. Image: In the 8 m long sediment cores the geologists found different types of earthquake traces. The picture shows the Plansee in Reutte, Tyrol. (Credit: Jasper Moernaut) Many steep valleys in the European Alps show the relicts of large rockslides, during which several hundreds of million cubic metres of rocks get instable, collapse and impact everything on their path. “For most of these, we still do not know how they are caused, because these rockslides occurred long before the start of written history in the region about 1000 years ago,” says

Patrick oswaldJasper moernautChrista hammerlMichael strasserTyrolean science fundAustrian science fundAustrian academy of sciencesDepartment of geologyEuropean regional development fund interregUniversity of innsbruckAustrian central institute for meteorologyEuropean alpsSedimentary geologyAustrian core facilityAustrian central instituteEastern alps