re: Smoke 'em if you got 'em: Only blind luck keeping asteroids from hitting cities

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I find this hard to believe. Chances are these would be landing in the oceans somewhere. Wouldn't an impact of that magnitude cause tsunamis?

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A tsunami can't really be generated at the surface unless it was really, really, big.

We've detonated nuclear weapons underwater that haven't caused it.


To make a tsunami, the origin would have to be close to the bottom as possible.

Remember they are generated by displacement of a large column of water. That is different from a wave that a surface impact would make.