Most likely the resultant wave would be so massive, it would literally be unable to propagate itself in adjacent waters. As a consequence a soliton would be created. It would head off across the ocean, with undiminished height and mass, to totally devastate the shoreline opposite.
Most likely the collapse of the Antarctic as the last glaciation of the current Ice Age came to an end, produced many such solitons, or maybe even one very large soliton in a catastrophic collapse.
This is why there are no major works of man older than that time anywhere that we know of.
650 metres (or meters) equals about 1900 feet high, which is a wave a third of mile high hitting the East Coast. The Empire State Building is only 1/4 of a mile high. It would travel 20 kilometers inland, or 12 miles from the ocean.
I have also read that the estimated population of hominids around the end of the last ice age may have been below 10,000, possibly close to 6,000. That may be another reason there isn't much evidence of major works. The "light" nearly went out.