Did you feel it!? it was The Big One!! or… Okay… it wasn’t that big, it didn’t even knock the precariously balanced TV off of my rickety/too-small-for-a-tv folding table. But it was definitely an earthquake. Sources (twitter) are saying that it originated just south of Chino Hills and was nearly a 6 on the Richter Scale. Here’s some imagery:

THE BIG ONE! - or maybe just 'THE ONE'... or 'A One' at least.