Little Quake

Today at around 2.40 pm while I was having an afternoon nap with Happy, we had a 2.2 earthquake tremor that woke us up and shook the flats, not much just a couple of small shakes that wobbled my Casio Organ that's next to the couch I was sleeping on. It's the first one I have ever noticed, I thought it was the undergound folk doing some blasting again, as we do often here loud explosions from them, but this time no loud noise. Just to reiterate IT WASN'T SERIOUS.