Monday's 5.2 magnitude temblor marked another success for California's early earthquake warning system, with users in some ...

FILE - This Sept. 13, 2011 file photo shows a computer replication of the 6.7 magnitude Northridge Earthquake of 1994 during a demonstration of an early earthquake warning system at the California ...

The United States Geological Survey manages the earthquake early warning system for the more than ... killing 40 people. Learning about the earthquake even just seconds before allowed emergency ...

Monday's magnitude 5.2 temblor marked another success for California's earthquake early warning system, with users in some areas saying they received alerts on their phones before they felt shaking.

Many users reported receiving alerts on their phones before Monday's magnitude 5.2 temblor in Southern California.