That is my worst nightmare, being up around 100 floors during a large earthquake, no thank you. I remember being up in the World Trade Center and it really felt like it was moving up on the observation level. Not my favorite building, wasn't that sorry to see it go (OK, not like that, but not missed by me...).
They jump whenever there are vibrations in the water. If one of the boats in the marina turns an engine on, the fish around will jump. I think it's it because they think vibration means large predator.