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| 千葉県北西部地震 | |
| UTC time | 2021-10-07 13:41:24 |
|---|---|
| USGS-ANSS | ComCat |
| Local date | 7 October 2021 |
| Local time | 22:41 |
| Magnitude | 5.9 Mw |
| Depth | 62.0 km (38.5 mi) (USGS) 75.0 km (46.6 mi) (JMA) |
| Epicenter | 35°34′37″N 140°04′12″E / 35.577°N 140.070°E |
| Areas affected | Japan |
| Total damage | Limited |
| Max. intensity | |
| Casualties | 51 injured[1] |
The 2021 Chiba earthquake (千葉県北西部地震, Chiba-ken Hokuseibu Jishin) was an earthquake that occurred in Japan at 22:41 JST (13:41 UTC) on October 7, 2021.[2] The epicenter was recorded approximately 4 kilometers (2.5 mi) southwest of Chiba in Chiba Prefecture. The earthquake struck a depth of around 62.0 kilometers (38.5 mi) to 75.0 kilometers (46.6 mi) with a magnitude of 5.9 on the Richter scale. A maximum intensity of Shindo 5+ was recorded, equivalent to VI (Strong) on the Mercalli scale. It was the strongest earthquake to strike the Tokyo area since the 2011 Tohoku earthquake.[3][4]
A maximum intensity of Shindo 5+ was recorded in the prefectures of Tokyo and Saitama.
| Intensity | Prefecture | Location[5] |
|---|---|---|
| 5+ | Saitama | Kawaguchi, Miyashiro |
| Tokyo | Adachi | |
| 5− | Saitama | Midori, Sōka, Warabi, Yashio, Misato, Satte, Yoshikawa, Kazo, Konosu, Kuki |
| Chiba | Chūō, Funabashi, Matsudo, Nagareyama | |
| Tokyo | Ōta, Machida | |
| Kanagawa | Tsurumi, Kanagawa, Naka, Kohoku, Midori, Kawasaki |
At least 51 people were injured, four of them seriously.[6][1]
Minor damage and power outages were reported in the epicentral area.[6]
Due to the earthquake, transportation such as railroads ceased operations temporarily. Additionally, a Nippori-Toneri Liner train derailed in Adachi, Tokyo.[7][8][9]
There were also reported instances of fires; an oil refinery processing unit was suspended after a fire broke out there.[10]