Earthquakes hitting California

HBSunglassCompany; based out of Southern California has been experiencing many earthquakes in the past couple weeks. It all started back on March 16 when many people were woken up by a 4.4 earthquake just before 4 a.m. Even though this earthquake did not have a strong shake it scared many people because it was the first earthquake after a few years. Then we received what felt to be huge one on April 4th; Easter Sunday. It registered to be 7.2 out of Baja California. Reports say that the earthquake on the 4th lasted a little over 40 seconds which felt like forever. We have had many smaller after shocks since the chain of earthquakes has started. This leaves the questions, "When will the big one hit?"