The ground keeps shaking in Southern California. A magnitude 5.4 aftershock hit just after 4 a.m. today near the town of Ridgecrest. That's near the center of the powerful 6.4 quake that rattled the area on the Fourth of July, the strongest earthquake to hit the region in about two decades. Experts say the ground will be moving for the next week or so, but the chances of another major quake in the area are dwindling as time goes by. The earthquakes have caused damage and several people have minor injuries.