Alert LA County Mass Notification System: http://alert.lacounty.gov
Red Cross Prepare SoCal: http://www.preparesocal.org
Ready LA: http://www.ReadyLA.org
EMD: http://www.emergency.lacity.org
Facebook: https://www.facebook.com/ReadyLA
Twitter: https://www.twitter.com/ReadyLA
Tumblr: http://readyla.tumblr.com
The Great California Shakeout: http://www.shakeout.org/california/