"Incorrect distribution" 20 times after midnight ... Why do you receive an emergency bulletin email in Kanagawa Prefecture in Tokyo?
Early in the morning of January 16, an emergency bulletin email arrived to a reporter living in Setagaya -ku, Tokyo
The Japan Meteorological Agency was over at midnight on the 16th due to a large -scale eruption on January 15 at the seabed volcano in the Tonga Islands, and the tsunami warning on the Amami Islands and Tokara Islands, and the tsunami caution centered on the Pacific coast of Okinawa from Hokkaido.We announced the news (Iwate Prefecture was temporarily tsunami warning).Meanwhile, in Kanagawa Prefecture, an emergency bulletin email (NTT DOCOMO is an area mail) that is not distributed at the time of tsunami warning was repeatedly distributed from early morning to the early morning, and criticism continued to be "I can not sleep" on the Internet.。After that, Kanagawa Prefecture apologizes as a mistake in setting a program by a contractor of the Disaster Information Management System.[Image] Endlessly from 0:00 am to 7:00 ... See 20 "Emergency Bulletin emails" The emergency bulletin email delivered this time is not only in Kanagawa Prefecture but also to smartphone users in Tokyo, and 0 am.It seems that some people have been waking up many times since the time.We asked Kanagawa Prefecture about the details of the incorrect transmission, and asked each mobile phone company about the mechanism of emergency bulletin emails.
It reaches the adjacent area
First of all, when I contacted the General Affairs Office of the Safety and Disaster Prevention Bureau of Kanagawa Prefecture about the process of misconceptions that occurred on January 16th, "It was repeatedly distributed to 16 municipalities in the prefecture, such as Yokohama and Kawasaki.。 Emergency bulletin emails and area emails are distributed by the base station of the mobile phone company, so it seems that there were cases in Ota -ku, Tokyo and Machida, Tokyo, which are adjacent to Kawasaki City.there was.So how are emergency bulletin emails and area emails distributed?First, we asked NTT DOCOMO (Chiyoda -ku, Tokyo), which provides area mail distribution services.Q.In the first place, when will the area email arrive?Does it reach even if the internet is usually not possible to connect to the Internet like an in -flight mode?The person in charge "Our area email is through an emergency such as disasters, through a docomo network through disaster / evacuation information provided by the Japan Meteorological Agency, special warnings on tsunami warnings, weather, etc., and disasters and evacuation information provided by the national and local governments.It is a service that is distributed to mobile phones in a certain area. For example, a tsunami warning / large tsunami warning by area email may be the Japan Meteorological Agency or the local government.Is only for local governments. If the source of tsunami warning, tsunami warning, and large tsunami warning is the local government, the local government will judge the distribution area and distribution.It cannot be received in the case of "turning off the power", "set to in -flight mode", "Rejected the receiving area mail by setting the mobile phone". "Q..It seems that the area email that Kanagawa Prefecture accidentally distributed to 16 cities and towns in the prefecture on the 16th, has arrived in some areas in Tokyo.why is it.The person in charge, "The range where the radio waves of the base station reach are completely consistent with the boundary of the municipalities. Therefore, we may receive area emails in adjacent areas near the boundary of municipalities.However, one base station may cover multiple municipalities widely (radio waves reach), so in that case, even in places that are not near the boundary of municipalities, receiving area emails in adjacent areas.There is also. In addition, in order to distribute urgent information related to life in a short time, the area mail is used for a short time, and may reach a wider area than the municipalities.Q.Then, does the area email cannot specify the distribution area in detail, such as "Send only to the coastal area of XX City"?The person in charge "The distribution area of the area mail is the minimum unit for distribution of municipalities and special wards, and cannot be distributed only in areas that are smaller than this.".Is the area email service basically targeted by NTT DOCOMO contractors?Or is it also eligible for other companies' cheap SIM services that use NTT DOCOMO lines, such as "Ahamo" and "OCN Mobile ONE"?Person in charge "DOCOMO's communication service (5G, XI, FOMA) and customers who contract with AHAMO can be used. However, some models do not respond to reception. Confirm that compatible models are confirmed on our official website.Please do. We will not answer the status of other businesses such as OCN Mobile ONE. "