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:
https://www.youtube.com/watch?v=lAxxZkpV0HI
(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)
Sometimes, the earthquakes will make guest appearances on the evening news too. As a matter of fact, the latest surprise guest appearance was just under a week ago.
And here is a collection of all the Earthquake Early Warnings that occurred in 2019.
That video shows how they appeared on NHK. Other stations have different styles, although they convey the same information. Here is how a warning from 2016 was shown on NHK, Nippon TV, TBS, Fuji TV, TV Asahi and TV Tokyo.
Those videos also show how tsunami warnings were presented on each station at that time. Just in case you don't know, a tsunami is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Earthquakes, volcanic eruptions and other underwater explosions (including detonations, landslides, glacier calvings, meteorite impacts and other disturbances) above or below water all have the potential to generate a tsunami.
Interestingly, you can also find people who have created their own style of earthquake and tsunami warnings (much like The Gallery here on TV Forum), based on information about previous earthquakes, or predictions about future earthquakes.
