Quake

 Being on the second floor of the house probably added to the swaying nature of the tremors. I remember back in Essendon we experienced a similar event but only once in the 40 yar we were there.  So this might be the last time we have one of these.  It was only a five to ten second swaying motion but enough to rock me side to side in the chair.  There are no tidal waves out there so far.  I'm sure someone will blame it on global warming though.