Here's a sample of what the message looks like:
|Line messenger emergency alert sample message. Image: ZDnet Korea|
This sample earthquake alert shows the magnitude, time and date, and epicenter location info. The alert should be received within 5 minutes of an earthquake.
More info here: [라인, 지진 정보 전달하는 '재해 속보' 계정 운영 - 지디넷코리아]
Of course you'll also now be getting these by regular SMS [Meteorological Agency to Send Earthquake Emergency Texts]