My mother just called me on her cell from San Diego to report a large earthquake just moments ago -- she said it was the biggest she's ever personally felt. Centered, she believes, in Baja California. She says the shaking went on for around 60 seconds.
I'm sure there will be many more reports, and once more information is reported I'll either update or take down this diary.
Update: Initial reported epicenter is Calexico, initial Richter reading is 6.9. My mother is at the Hotel Del Coronado listening to music on their Sun Deck -- she says that people there are rattled but otherwise okay.
More updates over the jump.