Plain Language Summary When crustal faults rupture, the energy released is the earthquakes we feel at the surface of the Earth. Recent studies along strike-slip faults demonstrate that these phenomena are often not only related to a single fault but instead take place along several faults like was seen in the 2016 Kaikoura earthquake in New Zealand. Using novel high-resolution seismic reflection imagery and bathymetric data together with the reanalysis of local seismicity, we show (i) multiple active faults in the Aysen Fjord area along the Liquine-Ofqui Fault System in the Patagonian Andes; (ii) several of these faults were activated during the last 2007 seismic sequence and one of them (the Punta Cola fault), ruptured to the surface causing a M-w 6.2 earthquake that generated massive landslides and local tsunami; and (iii) mapping of similar landslides in the fjord sediments demonstrates similar events occurred at least seven times since the last ice sheet retreat in the area, that is, in the last 12,000 yr. This demonstrates the necessity for including the possibility of complex ruptures involving multiple faults regarding seismic hazard assessment along crustal faults, especially for faults near populated areas.