[ENG SUB] How Earthquake Early Warning works : smartphone and radio broadcast

Osaka earthquake struck in northern Osaka area, Japan on 18 June 2018.
This dashcam video was recorded in Nishinomiya City, Hyogo Pref, 30 kilometers away from epicenter.

Smartphone beeped several times, and told "an earthquake has just occurred" in female voice. One second later than the first beep, Earthquake Early Warning was broadcasted on radio in male voice with chimes.

Earthquake Early Warning : https://en.wikipedia.org/wiki/Earthquake_Early_Warning_%28Japan%29

Видео [ENG SUB] How Earthquake Early Warning works : smartphone and radio broadcast канала kappa-no koura