The earth moved...and not in a good way!

First the cat took off and not under the bed as she usually does when she's scared, but she jumped onto the kitchen table and just sat there. Then I felt it. My armchair moved over the tile floor...........Then my phone started buzzing. People were asking if I felt the tremor, trying to confirm that they were not imagining things. So unusual in the East of Pretoria that a local shopping center was asking on FB if we felt the tremor. That sent me of looking at the location of tectonic plates in South Africa. This did confirm my suspicion that the earth below the mining areas in Gauteng must look like honeycomb, and that earthquakes can happen in Gauteng. The 1 o'clock news just confirmed it was a earthquake, 5.3 on the Richter Scale. Scary stuff!