Landslide deposits in Karrat Fjord, West Greenland

Landslides are common in the fjords of West Greenland. A rock avalanche occurred in Karrat Fjord on 17 June 2017 and the displacement wave caused four casualties in the nearby village of Nuugaatsiaq. Sediments deposited during this and other events are recorded in the sedimentary record of Karrat Fjord. Archive data provides information of the geomorphology of the fjord before the 2017 event. GEUS expedition SANNA 2021 in the fjord obtained multibeam bathymetry, reflection seismic (single and multichannel sparker) and seven gravity cores. Our work identifies and map landslide deposits in Karrat Fjord with special focus on the 2017 rock avalanche within the framework of the Geocenter Denmark project "Landslides in a changing climate: geohazards and benthic habitats in northwest Greenland". Interpretation of the seismic data in Petrel, together with XRF, grain-size analyses, and 210Pb-dating of the cores, have led to the identification of several paleo-landslides in the north slope and allowed us to map the distribution of the sediments related to the 2017 rock avalanche. Preliminary results indicate east-west migrating paleo-landslides and southwest location of the 2017 deposits