130 Largest: Mw 5.7 on 21 February 2019 (9:22 pm JST)[3]
Casualties
41 dead, 691 injuries[4]
An earthquake measuring 6.6 Mw on the moment magnitude scale struck Iburi Subprefecture in southern Hokkaido, Japan, on 6 September 2018 at 3:08 a.m. JST. The earthquake's epicenter was near Tomakomai and occurred at a depth of 35.0 kilometers (21.7 mi). The Japan Meteorological Agency (JMA) registered a magnitude of 6.7 Mj and a maximum intensity of 7 on the shindo scale.[5]
Shaking from the earthquake was felt strongly in Hokkaido and Aomori Prefecture, and shaking was felt as far away as the Kantō region.[6][7] Long period ground motion (LPGM) during the earthquake reached maximum of class 4 on the JMA LPGM intensity scales.[8] The earthquake disrupted electrical service throughout Hokkaido, leaving 5.3 million residents without power. Forty-one people were confirmed dead and six hundred and ninety-one were injured.[4] The event is officially known as Heisei san-jū-nen Hokkaidō Iburi tōbu jishin (平成30年北海道胆振東部地震, "Hokkaido Eastern Iburi Earthquake of Heisei 30").
^"平成 30 年北海道胆振東部地震の評価" (PDF) (in Japanese). Earthquake Research Promotion Headquarters Earthquake Investigation Committee. Retrieved 7 September 2018.
^Yoshihiko Ito; Shusaku Yamazaki; Toshiyuki Kurahashi (2020). "Geological features of landslides caused by the 2018 Hokkaido Eastern Iburi Earthquake in Japan". Geological Society, London, Special Publications. 501: 171–183. doi:10.1144/SP501-2019-122. S2CID 213673003.
^"Earthquake Information (Earthquake and Seismic Intensity Information) Issued at 21:26 JST 21 Feb 2019". Japan Meteorological Agency. 21 February 2019. Archived from the original on 22 February 2019. Retrieved 22 February 2019.
^ ab平成30年北海道胆振東部地震による被害及び消防機関等の対応状況(第31報) (PDF) (in Japanese). Fire and Disaster Management Agency. 5 October 2018. Archived from the original (PDF) on 6 October 2018. Retrieved 3 December 2018.
^"M 6.6 – 27km E of Tomakomai, Japan". United States Geological Survey. Retrieved 6 September 2018.
^"M 6.6 – 27km E of Tomakomai, Japan: Did You Feel It?". United States Geological Survey. Retrieved 6 September 2018.
^"震度データベース検索 （地震別検索結果）" [Seismic intensity database search (search results by earthquake)] (in Japanese). Japan Meteorological Agency. Archived from the original on 8 September 2018. Retrieved 3 December 2018.
^"Earthquakes and Tsunamis: Observation and Disaster Mitigation" (PDF). Japan Meteorological Agency. March 2019. p. 19. Retrieved 13 June 2019.
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