Recent series of L.A. earthquakes was along dangerous fault system that rivals the San Andreas

An aerial view of the La Cañada foothills shows dust and dirt thrown into the air following a magnitude 5.9 earthquake from Oct. 1, 1987. Monday’s magnitude 4.4 earthquake centered four miles northeast of downtown Los Angeles was modest but packed quite a jolt. Although no major damage was reported, experts say the temblor was in the general area of a dangerous fault system — one they have long feared is capable of producing a catastrophic earthquake in the heart of the city. The quake ruptured on a small fault...