2018 Hokkaido Eastern Iburi earthquake

2018 Hokkaido Eastern Iburi earthquake
Landslides in Atsuma
Intensity map
2018 Hokkaido Eastern Iburi earthquake is located in Hokkaido
2018 Hokkaido Eastern Iburi earthquake
Sapporo
Sapporo
2018 Hokkaido Eastern Iburi earthquake is located in Japan
2018 Hokkaido Eastern Iburi earthquake
Sapporo
Sapporo
UTC time2018-09-05 18:07:58
ISC event612697604
USGS-ANSSComCat
Local date6 September 2018 (2018-09-06)
Local time3:08 a.m. JST
Magnitude6.6 Mw
Depth35.0 km (22 mi)
Epicenter42°40′16″N 141°55′59″E / 42.671°N 141.933°E / 42.671; 141.933
TypeDip-slip (reverse)
Intraplate earthquake[1]
Areas affected
  • Japan
Max. intensityMMI X (Extreme)[2]

JMA 7
Peak acceleration1.83 g
1796 Gal
TsunamiNo
LandslidesYes
Aftershocks130
Largest: Mw  5.7 on 21 February 2019 (9:22 pm JST)[3]
Casualties41 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").

  1. ^ "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.
  2. ^ 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.
  3. ^ "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.
  4. ^ a b 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.
  5. ^ "M 6.6 – 27km E of Tomakomai, Japan". United States Geological Survey. Retrieved 6 September 2018.
  6. ^ "M 6.6 – 27km E of Tomakomai, Japan: Did You Feel It?". United States Geological Survey. Retrieved 6 September 2018.
  7. ^ "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.
  8. ^ "Earthquakes and Tsunamis: Observation and Disaster Mitigation" (PDF). Japan Meteorological Agency. March 2019. p. 19. Retrieved 13 June 2019.