This overnight event explains why my left sinus continues to hurt.  Never before have I ever had any sort of headache last for two days.  This was about 30 miles northwest of me.

3.6
Date-Time

Tuesday, December 28, 2010 at 12:36:50 AM at epicenter

Location 34.518°N, 118.681°W
Depth 18.9 km (11.7 miles)
Region SOUTHERN CALIFORNIA
Distances

6 km (4 miles) W (262°) from Castaic Lake dam, CA