They have special guests on Japanese morning programmes too, this particular episode featured an earthquake as special guest right at the top of the hour one morning, making it as punctual as the trains in Japan:
(Japan sits on an earthquake belt and has many earthquakes every year, and so this earthquake warning stuff is actually quite common on NHK, as they're the public broadcaster over there and are required to basically "get the word out" as it were when an earthquake strikes, and all the "chattering" at the end of the video is the wake-up call for Japanese TVs to power up and tune to NHK at full volume.
Its sort of a slight oxymoron that the warning tone for an earthquake/tsunami in Japan sounds like a mobile phone going off followed by the information, and yet in America where you have the Emergency Broadcast System (and the later Emergency Alert System) which generates the most irritating tone going and I believe is also used on the occasions where they test it)