If that civilization was on the ocean floor, sure.

The "what if geological processes erased a truely ancient civilization" question comes up frequently and the most rigorous treatment of this thought experiment is contained in a paper called The Silurian Hypothesis...check out the wikipedia article on it and the paper as well if you're interested in that sort of thing.

It's called the Y couloir on Ypsilon Mountain...skiable depending on conditions, but its remote and gnar gnar.

You have some basic misuse of terminology here which makes it impossible to answer your question. Cavitation is a vapor/liquid phase phenomenon and has nothing to do with EM radiation. Rupturing is also a physical process that does not apply to EM radiation.

The closest thing I can think of that your question resembles would be destructive interference? You should read up on what all the jargon you're using means and come back with a coherent question if you're looking for an answer.

The moon is slowing migrating away from Earth, not towards it. And, to be pedantic, stars like the sun don't explode. They swell, puff off outer layers and then shrink into a white dwarf.

Geologist here...yep, the impact theory is still the accepted theory on the formation of the moon.

Since the 70s, better computer modeling, improved geophysical studies of the earth and moon and isotopic evidence have added pretty convincing evidence in support of the impact hypothesis.

The wikipedia article is pretty good.