Editing Tokyo (section)

==== Volcanic eruptions ====
[[File:宝永大噴火を描いた絵図「夜ルの景気」(静岡県沼津市土屋博氏所蔵).jpg|thumb|[[Mount Fuji]] has posed the primary volcanic threat to Tokyo's citizens for centuries.]]
[[Mount Fuji]] is about {{cvt|100|km|mi}} southwest of Tokyo. There is a low risk of eruption. The last recorded was the [[Hōei eruption of Mount Fuji|Hōei eruption]] which started on December 16, 1707, and ended about January 1, 1708 (16 days).<ref name="ShizuokaUni">{{cite web |author=Masato Oyama |date=March 2007 |script-title=ja:宝永四年（1707）噴火 (1707 Eruption) |url=http://sk01.ed.shizuoka.ac.jp/koyama/public_html/Fuji/fujid/1707.html |url-status=dead |archive-url=https://web.archive.org/web/20170812141355/http://sk01.ed.shizuoka.ac.jp/koyama/public_html/Fuji/fujid/1707.html |archive-date=August 12, 2017 |access-date=September 25, 2008 |publisher=Shizuoka University |language=ja |script-work=ja:富士山歴史噴火総解説 (Database of eruptions and other activities of Fuji Volcano, Japan, based on historical records since AD 781)}}</ref> During the Hōei eruption, the ash amount was 4&nbsp;cm in southern Tokyo (bay area) and 2&nbsp;cm to 0.5&nbsp;cm in central Tokyo.<ref name="Hoei-eruption-map">https://commons.wikimedia.org/wiki/File:Volcanic-ash-downfall_map_of_Mt.Fuji_Hoei-eruption01.jpg {{Webarchive|url=https://web.archive.org/web/20210818054657/https://commons.wikimedia.org/wiki/File:Volcanic-ash-downfall_map_of_Mt.Fuji_Hoei-eruption01.jpg |date=August 18, 2021 }} Ashfall distribution map for examining disaster prevention measures (Mt. Fuji Hoei eruption)</ref> [[Kanagawa]] had 16&nbsp;cm to 8&nbsp;cm ash and [[Saitama Prefecture|Saitama]] 0.5 to 0&nbsp;cm.<ref name="Hoei-eruption-map" /> If the wind blows north-east it could send [[volcanic ash]] to Tokyo metropolis.<ref name="fuji-eruption">{{cite web |title=Mt Fuji eruption could cripple Tokyo | date=March 31, 2020 |url=https://www.youtube.com/watch?v=JJjugxAdPYQ |archive-url=https://web.archive.org/web/20201108023355/https://www.youtube.com/watch?v=JJjugxAdPYQ |archive-date=November 8, 2020 |publisher=Nippon TV News 24 Japan |via=YouTube}}</ref> According to the government, less than a millimeter of the volcanic ash from a Mount Fuji eruption could cause power grid problems such as blackouts and stop trains in the Tokyo metropolitan area.<ref name="fuji-eruption" /> A mixture of ash with rain could stick to cellphone antennas and power lines and cause temporary power outages.<ref name="fuji-eruption" /> The affected areas would need to be evacuated.<ref name="fuji-eruption" />