Never been near an earthquake nor experienced the sound barrier being broken ...... but was sitting with the kids in the lounge room when my ears "popped" and almost simultaneously the whole house shook for about 2-3 seconds. Fortunately no damage to speak of, however my neighbour had light fittings dislodged ! I don't know what the heck it was and have my doubts about both explanations. Would anyone have a radar tape as proof?