Northridge earthquake shattered Los Angeles 25 years ago

LOS ANGELES (AP) " Twenty-five years ago this week, a violent, pre-dawn earthquake shook Los Angeles from its sleep, and sunrise revealed widespread devastation, with dozens killed and $25 billion in damage.

The magnitude 6.7 earthquake shattered buildings, broke water mains and ignited fires in the city's San Fernando Valley neighborhoods. It was felt as far away as Las Vegas.

Since then there has been a push toward progress on everything from making buildings safer to increasing society's overall ability to deal with seismic threats.

This month, the Los Angeles Economic Development Corp. released a guide aimed at helping businesses minimize disruptions from major earthquakes.

Mayor Eric Garcetti also unveiled a mobile app that uses an early warning system to alert Los Angeles County residents when there is an earthquake of magnitude 5.0 or greater.