@danlab

Many dinosaurs would happily survive a tsunami, either being flight-capable or aquatic, and the land versions reached such immense sizes dues to amazingly light bone structure via such means as internal air pockets, like modern flying birds, so their "floatability" would also be up for debate. For those out there wanting to add that they would have the in-built survival awareness of modern animals to run to higher ground (many documented cases show this but are unscientific), that is up to the jury as we just don’t know enough about the wiring of their brains.