Earthquake?

Apparently there was an earthquake early in the morning yesterday, with an aftershock a few hours later. We must have slept through the whole thing, because I didn't have a clue anything had happened until I saw the news at noon.

Then again, we live not too far from a quarry, so we hear and feel rumbles every once in a while. We probably wouldn't have thought anything about it if it were as intense as those.