A 3.5 earthquake struck Pacifica, California this morning followed by two smaller quakes according to the United States Geographraphical Survey. 

The first quake happened at 6:01 a.m. Two preliminary 2.6 earthquakes then followed at 6:03 and 6:04 a.m. 

According to the Los Angeles Times, the initial 3.5 earthquake was strong enough to be felt at the San Francisco Airport.