a colleague of mne who lives in Greystones was woken by it, specifically by his dog barking. Other colleagues who live in the area but heard nothing were making fun of him 'til they saw the story on the RTE News site.
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.