Magnitude 4.0 earthquake shakes Southern California, Santa Clarita

A 4.0-magnitude earthquake shook Southern California and was felt in the Santa Clarita Valley early Monday morning.   The earthquake, according to the United States Geological Survey, struck at 4:44 a.m., near Lennox a recorded depth of 12 miles underground.   “The unusual depth (~20 km) may have had something to do with this,” the USGS said in a statement released early Monday morning.