1923 Great Kantō earthquake
  Tokyo
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| Date | September 1, 1923 |
|---|---|
| Origin time | 11:58:32 JST (UTC+09:00) |
| Duration | 48 sec 4 min |
| Magnitude | 7.9 8.0 8.2Mw |
| Depth | 23 km (14 mi) |
| Epicenter | 35°19.6′N 139°8.3′E / 35.3267°N 139.1383°ECoordinates: 35°19.6′N 139°8.3′E / 35.3267°N 139.1383°E |
| Type | Megathrust |
| Areas affected | Japan |
| Max. intensity | XI (Extreme) |
| Tsunami | Up to 12 m (39 ft) in Atami, Shizuoka, Tōkai |
| Landslides | Yes |
| Aftershocks | 6 of 7.0 M or higher |
| Casualties | 105,385 deaths |
The Great Kantō earthquake (関東大震災 Kantō daishinsai?) struck the Kantō Plain on the Japanese main island of Honshū at 11:58:44 a.m. JST (2:58:44 UTC) on Saturday, September 1, 1923. Varied accounts indicate the duration of the earthquake was between four and ten minutes.
The earthquake had a magnitude of 7.9 on the moment magnitude scale (Mw), with its focus deep beneath Izu Ōshima Island in Sagami Bay. The cause was a rupture of part of the convergent boundary where the Philippine Sea Plate is subducting beneath the Okhotsk Plate along the line of the Sagami Trough.
This earthquake devastated Tokyo, the port city of Yokohama, and the surrounding prefectures of Chiba, Kanagawa, and Shizuoka, and caused widespread damage throughout the Kantō region. Its force was so great in Kamakura, over 60 km (37 mi) from the epicenter, it moved the Great Buddha statue, which weighs about 93 short tons (84,000 kg), almost two feet.
Estimated casualties totaled about 142,800 deaths, including about 40,000 who went missing and were presumed dead. According to the Japanese construction company Kajima Kobori Research's conclusive report of September 2004, 105,385 deaths were confirmed in the 1923 quake.
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