We live in Rathfarnham, my insomniac son was on his computer about 3.15 am and heard a loud rumbling noise which he thought was a plane. He noticed the knocker on our front door was vibrating too!!
I experienced quite a strong one in Egypt some years ago - the chair tilted several inches and my typewriter slid off the desk - didn't have a clue what was happening. I also remember the '84 one, went into labour hours later with the insomniac son.