A 200-meter tall megatsunami occurred in Greenland in 2023, caused by a massive landslide, and was detected due to the destruction it left at a remote military base. The event generated unusual seismic signals that lasted for a week, indicating the powerful and prolonged effects of the wave in the fjord where it occurred.

This chapter discusses the phenomenon of mega tsunamis, which are often caused by massive landslides rather than earthquakes or volcanoes. It highlights a recent event in 2023 that went largely unnoticed due to its remote location, emphasizing the unpredictable and destructive nature of these enormous waves.

The chapter discusses the increasing frequency of mega tsunamis, particularly in regions with permafrost and glaciers. It highlights the role of landslides and glacier collapses in generating these events and the importance of seismic monitoring to predict and understand them.