Prehistoric tsunamis
Approx . date Location Cause Evidence for tsunami
66 million years BP Chicxulub crater , Yucatan asteroid strike presumed
35.5 million years BP Chesapeake Bay bolide impact presumed
10,000 yrs BP Seton Portage , British Columbia landslide into lake presumed
8,000 years BP Mount Etna , Sicily volcanic landslide submarine sediments off Etna , submerged settlements off eastern Mediterranean coast , e.g . Atlit Yam
8,000 years BP Norwegian Sea submarine landslip ( Storegga Slide ) deposited sediments in Scotland
4,000 BP Réunion island landslide presumed
Prehistoric tsunamis are tsunamis and so-called `` megatsunamis '' that occurred before recorded history . The events have been identified through oral tradition and/or geological evidence . Those events that have been identified through contemporary records are listed as historic tsunamis .
Prehistoric tsunamis are tsunamis and so-called megatsunamis that occurred before recorded history. The events have been identified through oral tradition and/or geological evidence. Those events that have been identified through contemporary records are listed as historic tsunamis.