From the WashPost: The Los Angeles earthquake hit a fault system that could pose a massive threat. Here’s what to know. This fault could pose a bigger risk to populated areas of the city than the notorious San Andreas fault.

“The 4.4 magnitude earthquake that jolted the Los Angeles area this week hit in the area of a fault system that could pose an even greater threat to parts of the city than the notorious San Andreas fault. The Monday quake and recent smaller earthquakes in the vicinity have placed renewed attention on the Puente Hills fault and the dangers it could bring.”