The Great Kantō earthquake also known in Japanese as Kantō daishinsai (関東大震災) struck the Kantō Plain on the main Japanese island of Honshū at 11:58:32 JST on Saturday, September 1, 1923. Varied accounts indicate the duration of the earthquake was between four and ten minutes. Extensive firestorms and even a fire whirl added to the death toll.

The Kantō Plain , in the Kantō region of central Honshu, is the largest plain in Japan. Its 17,000 km2 covers more than half of the region extending over Tokyo, Saitama Prefecture, Kanagawa Prefecture, Chiba Prefecture, Gunma Prefecture, Tochigi Prefecture, and Ibaraki Prefecture.