Annecdote: I often find that buildings in Australia vibrate / shake. One that stands out in my mind, there's a shopping center in southern Sydney suburb of Hurstville, at one particular spot, it feels like a short tremblor is striking every 10 mins, to the point where I looked up if anyone else may be concerned. There are a lot of cracks in the concrete, but I think that I've read somewhere that as long as the cracks are vertical, that's not bad. However, I'm somehow not convinced that this building would survive should a small real earthquake occur (rare for Sydney, but there was a Newcastle one in recent memory).