4.9 in Yucaipa

Earthquake yesterday. I thought it was a jackhammer on the floor below. Doesn't make any sense I know, but that's what went through my mind. I was also surprised how long it lasted. Then suddenly it was over, and I wondered if I'd imagined the whole thing. Except that a picture frame had fallen. I'm an atheist, but plate tectonics make me understand why people believe in god.