One entry now, more later:

At least one tsunami-related archaeological item Discovery of Minoan tsunami deposits

This is the only one we could think of offhand, though we are certain there are more (for example, here for a New Zealand example). We seem to recall some recent controversy over the idea that the Santorini eruption and resulting ashfall and tsunami actually resulted in the collapse of the Minoan civ., but we could be mistaken on this. And we're too lazy (and busy) to go searching through the archives.