This paper is an interesting read: https://www.sciencedirect.com/science/article/pii/S0094576517314996 https://www.sciencedirect.com/science/article/pii/S00945

This paper is an interesting read: https://www.sciencedirect.com/science/article/pii/S0094576517314996 https://www.sciencedirect.com/science/article/pii/S009457651... Not my area of expertise, but it sounds like a deep ocean impact would not be completely catastrophic. With only ∼1% of the asteroid kinetic energy being converted into tsunami waves and with the stronger decay with distance implies that moderate size asteroids (100–500 m in diameter) striking the deep ocean basins off the continental shelves are not a significant overall hazard... So like a 50% chance it wouldn't be that bad. Larger asteroids would vaporize enough ocean water to cause long lasting atmospheric affects. Otherwise, a land impact would be somewhere in the 1-100 Tsar Bomba range energy wise.