And roll they did:
A moderate earthquake occurred at 11:42:15 AM (PDT) on Tuesday, July 29, 2008.
The magnitude 5.4 event occurred 4 km (3 miles) WSW of Chino Hills, CA.
The hypocentral depth is 14 km ( 8 miles).
Damsel and I were at home and at work, respectively, as shown by the two red spots in the shake map below. We both felt a jolt and then about 90 seconds of light rolling with another jolt sometime in the middle of the rolling. I needed to get my sea legs when I stood up to look out of the window. Neither of us had any damage or anything tip over. Bear, our Shepard/Lab mix dog hid under Damsel’s desk for a long time after the shaking stopped.