Messages in the EAS are composed of four parts: a digitally encoded Specific Area Message Encoding (SAME) header, an attention signal, an audio announcement, and a digitally encoded end-of-message marker. See more

The number of event types in the national system has grown to eighty. At first, all but three of the events (civil emergency message, immediate evacuation, and emergency action notification [national emergency]) were weather-related (such as a See more

False alarms
• On February 20th, 1971, an Emergency Action Notification (now National Emergency … See more

The FCC requires all broadcast stations and multichannel video programming distributors (MVPD), hereafter "EAS participants", to install and maintain FCC-certified EAS decoders and encoders at their control points or headends. These decoders … See more

All EAS equipment must be tested on a weekly basis. The required weekly test (RWT) consists, at a minimum, of the header and end-of … See more

The EAS can only be used to relay audio messages that preempt all programming; as the intent of an Emergency Action Notification is to serve as a "last-ditch effort to get a message out if the president cannot get to the media", it can easily be made redundant by … See more

• 1990s portal
• Alert Ready (Canada)
• Cell Broadcast
• Digital Emergency Alert System (DEAS)
• Earthquake Early Warning (Japan) See more