So I finally got around to watching this. I thought it was a good film and very well done. I don't really understand how the landscape got so high to just about cover New York City. If it was an earthquake and city sunk then all the building would have been destroyed as well.
It was a number of cataclysmic events, as I recall. Not just earth quakes but tidal waves, major climate changes and so forth. In "reality", yeah the ESB shouldn't still have been standing, nor should any structure really have been "buried" but still enterable as caverns (like the NY Public Library) but it's a movie that really wanted these types of visuals and such and I think it actually worked.