According to the U.S. Geological Survey, the epicenter of the quake was about two miles west-southwest of Millbrae and about three miles southeast of Pacifica.
The epicenter was just west of the San Andreas Fault. The fault line runs through San Andreas Lake.
Post in the comments below and let us know if you felt the quake.
(CORRECTION: The text below this headline originally gave the incorrect direction of the epicenter in relation to I-280.)