The news of the news from midnight after midnight "misleading" ... Why the emergency bulletin email in Kanagawa Prefecture arrives in Tokyo?

Emergency bulletin email arrived to reporters living in Setagaya -ku, Tokyo early in the morning on January 16th

　The Japan Meteorological Agency was over at midnight on the 16th due to a large -scale eruption on January 15 at the submarine volcano in the Tonga Islands, tsunami warning on the Amami Islands and Tokara Islands, and the tsunami caution centered on the Pacific coast of Okinawa from Hokkaido. The news was announced (Iwate Prefecture was temporarily a tsunami warning). Meanwhile, in Kanagawa Prefecture, emergency bulletin emails (NTT DOCOMO) that are not distributed during the tsunami warning (NTT DOCOMO) were repeatedly distributed from early morning to early morning, and criticism continued to be "I can't sleep" on the Internet. 。 After that, Kanagawa Prefecture has apologized for setting a program settings 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 emails distributed this time are not only in Kanagawa Prefecture but also to smartphone users in Tokyo, and 0 am. It seems that some people have been woken 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 Kanagawa Prefecture Large Disaster Prevention Bureau about the history of the misconceptions 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 where it arrived in Ota -ku, Tokyo and Machida, Tokyo, which are adjacent to Kawasaki City.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 National Agency, special warnings on tsunami warnings, tsunami warnings, and disasters and evacuation information provided by the government and local governments. It is a service that allows you to simultaneously distribute to a mobile phone in a certain area. For example, the tsunami warning / large tsunami warning by area mail may be the Japan Meteorological Agency or the local government. Is only for local governments. If the distribution source of tsunami warning, tsunami warning, and large tsunami warning is the local government like Kanagawa Prefecture, local governments will determine the distribution area and distribution. It cannot be received in the case of "turning off the power", "set to in -flight mode", "I am refusing to receive area mail by setting the mobile phone". "Q..It seems that Kanagawa Prefecture has accidentally distributed an area email to 16 cities and towns in the prefecture on the 16th.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 email is used for a simultaneous distribution, and may reach a wider area than the municipalities.Q.Then, does the area email cannot be specified in detail, such as "Send only to the coastal area of XX City"?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 (Ahamo)" and "OCN Mobile ONE"?Person in charge "DOCOMO's communication service (5G, XI, FOMA) and customers who contract 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. "