When Mineral, VA had a 5.5 EQ in 2011, I felt it at home as a strong shuddering of the room for 15 seconds. I then kept a bowl of water on the table between my TV and my computer where I was following EQ news. Several times I could see little waves form on the surface of the water in the bowl, and sure enough in about 10 minutes the news would report something like a 2 or 2.5 aftershock. In 1957, I was in a 7.5 in Mexico City, and for weeks afterward when I was laying down I would feel little earth shudders a number of times.