The dataset contains the raw data that is the basis for the research published in Kempf et al. 2017 about a paleotsunami record of 17 events in the past 5500 years in a coastal lake on Chiloé Island in south central Chile. The dataset consists of hydroacoustic data, i.e., 2D sub-bottom profiles (3.5 kHz Pinger) and sidescan sonar data (Klein3000), and sediment core data, i.e., split core images, X-ray CT-scans, multi-sensor core logs and the core metadata.