[Utah-astronomy] Atlantic Immune to Tsunamis?

I recall a story about the Canary Islands El Hierro and La Palma. EL Heirro had a major landslide that created its crescent shape, this landslide was believed to have caused a huge tsunami that reached the east coast of the US with huge waves. La Palma has a similar fault line that bisects the island. One theory is that is if this fault goes, half of the island would fall into the sea causing a Tsunami that would be several hundred meters in height as it hits the eastern US. Seems geologists are somewhat split, some think the Island will spilt in half over a long period of time, some think it will happen in one catastrophic event. The evidence at El Hierro seems to suggest it will happen all at once.