List of foreshocks and aftershocks of the 2011 Tōhoku earthquake

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Map of aftershocks until March 14 (first 4 days) Map of Sendai Earthquake 2011.jpg
Map of aftershocks until March 14 (first 4 days)
Visualization of intensity of aftershocks in the first few days 2011 Japan Sendai earthquake.jpg
Visualization of intensity of aftershocks in the first few days
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This is a list of foreshocks and aftershocks of the 2011 Tōhoku earthquake. Japan had experienced 900 aftershocks after the M9.1 earthquake on March 11, 2011 with about 60 aftershocks being over magnitude 6.0 and three over magnitude 7.0. For conciseness, only earthquakes with magnitudes greater than 7.0 or an intensity greater than lower-6 on the shindo scale are listed here. Mw refers to the moment magnitude scale, while Mjma, Mjma, or Mj refer to the Japan Meteorological Agency seismic intensity scale.

Contents

Foreshocks

Japan Time MagnitudeCoordinatesDepthIntensity (shindo) [1] Comment
2011-03-09 11:45Mw 7.3, Mj 7.3 [2] 38°25′26″N142°50′10″E / 38.424°N 142.836°E / 38.424; 142.836 32 km [USGS 1] 5-

The source was estimated to have a length of 28.7 km and a width of 53.2 km with a slip of 1.25 m. [3] Caused a 55 cm tsunami. [4]

2011-03-10 06:23Mw 6.4, Mj 6.8 38°10′16″N143°02′35″E / 38.171°N 143.043°E / 38.171; 143.043 9 km4Caused 11 cm Tsunami. [5]

Main shock

Japan TimeMagnitudeCoordinatesDepthIntensity (shindo) [1] Comment
2011-03-11 14:46 Mw 9.1, Mj 8.4 [2] 38°19′19″N142°22′08″E / 38.322°N 142.369°E / 38.322; 142.369 29 km [USGS 2] 719,759 deaths, [6] 2,553 people missing [7] , tsunami, nuclear incidents.

Aftershocks

Japan TimeMagnitudeCoordinatesDepthIntensity (shindo) [1] Comment
2011-03-11 15:08Mj 7.4 [1] 39°49′12″N139°01′30″E / 39.82°N 139.025°E / 39.82; 139.025 32 km [1] 5-
2011-03-11 15:15Mw 7.9, Mj 7.6 [1] 36°16′N141°08′E / 36.27°N 141.14°E / 36.27; 141.14 43 km [USGS 3] 6+
2011-03-11 15:25Mw 7.7, Mj 7.5 [1] 38°03′N144°35′E / 38.05°N 144.59°E / 38.05; 144.59 19 km [USGS 4] 4
2011-04-07 23:32Mw 7.1, Mj 7.2 [1] 38°15′11″N141°38′24″E / 38.253°N 141.640°E / 38.253; 141.640 42 km [USGS 5] 6+ 4 dead, 100+ injured, large scale power outage in Tōhoku region. [8] [9]
2011-04-11 17:16Mw 6.6, Mj 7.0 [1] 37°00′25″N140°28′37″E / 37.007°N 140.477°E / 37.007; 140.477 10 km [USGS 6] 6- 6 dead, several injured, localized power outage and landslides in Iwaki, Fukushima. [10]
2011-04-12 14:07Mj 6.4 [1] 37°03′07″N140°38′35″E / 37.052°N 140.643°E / 37.052; 140.643 15 km [1] 6-
2011-07-10 09:57Mw 7.0, Mj 7.3 [1] 38°02′24″N143°17′13″E / 38.040°N 143.287°E / 38.040; 143.287 23 km [USGS 7] 410 cm of tsunami in Sōma and Ōfunato. [11]
2012-12-07 17:18Mw 7.3 [1] 37°48′N144°12′E / 37.8°N 144.2°E / 37.8; 144.2 49 km (JMA) [1]
36 km [USGS 8] 		5- Tsunami under 1 meter. Considered an aftershock by the National Earthquake Information Center in Colorado, USA. [12]
2013-10-26 02:10Mw 7.1 37°10′12″N144°39′54″E / 37.170°N 144.665°E / 37.170; 144.665 10 km [USGS 9] 4Tsunami [13]
2016-11-22 05:59Mw 6.9 37°23′35″N141°23′13″E / 37.393°N 141.387°E / 37.393; 141.387 9 km5-
2021-02-13 23:07:49Mw 7.1
MJMA 7.3		 37°41′10″N141°59′31″E / 37.686°N 141.992°E / 37.686; 141.992 35 km (USGS)
55 km (JMA)		 6+ This earthquake resulted in at least 1 death and left at least 185 injured. [14] Serious damage was caused. There was no tsunami. It is believed that this was an aftershock of the earthquake almost 10 years to the exact date of the 2011 mainshock. [15]
2021-03-20 18:09:45Mw 7.0
MJMA 6.9		 38°28′30″N141°36′25″E / 38.475°N 141.607°E / 38.475; 141.607 54 km (USGS)
60 km (JMA)		5+11 people injured. [16]

The following earthquakes are possibly related to the 2011 Tōhoku earthquake. However, agreement toward the relationships has not been reached among the researchers. [17]

Japan TimeMagnitudeCoordinatesDepthIntensity (shindo) [1] Comment
2011-03-12 03:59Mw 6.3, Mj 6.7 [1] 37°01′N138°22′E / 37.02°N 138.36°E / 37.02; 138.36 8 km [1]
2 km [USGS 10] 		6+Possibly a triggered earthquake. [18] [19]
2011-03-12 04:31Mj 5.9 [1] 36°56′53″N138°34′19″E / 36.948°N 138.572°E / 36.948; 138.572 1 km [1] 6-Possibly a triggered earthquake. [19]
2011-03-12 05:42Mj 5.3 [1] 36°58′19″N138°35′24″E / 36.972°N 138.59°E / 36.972; 138.59 2 km [1] 6-Possibly a triggered earthquake. [19]
2011-03-15 22:31Mw 6.0, Mj 6.4 [2] 35°17′N138°32′E / 35.29°N 138.54°E / 35.29; 138.54 9 km [USGS 11] 6+ 50 injured. Power outage. [20] Near presumed location of magma chamber of Mount Fuji.
Sinistral strike-slip fault. [21] Possibly a triggered earthquake. [22]
2021-05-01 10:27:27 [23] Mw 6.8 38°13′48″N141°39′54″E / 38.230°N 141.665°E / 38.230; 141.665 47 km5+Three people were injured by the strong shaking. [24]
2022-03-16 23:36:33Mw 7.3
MJMA 7.4		 37°42′07″N141°35′13″E / 37.702°N 141.587°E / 37.702; 141.587 63.1 km (USGS)
57 km (JMA)		 6+ A tsunami advisory was issued by the Japan Meteorological Agency for this earthquake. There was 4 dead and 225 injured. [25] [26] [27] An estimated 2.2 million households from 13 prefectures and one metropolitan area were left without power. [28]

Related Research Articles

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An intense and deadly seismic event struck offshore east of Tōhoku, Japan. The MJMA  7.3 or Mw  7.1 earthquake occurred on a Saturday night at 23:07 JST on 13 February at a focal depth of 44.0 kilometers (27.3 mi). It had a maximum JMA intensity of Shindo 6+ to Shindo 7 while on the Mercalli intensity scale, earned a rating of VIII (Severe). The earthquake was followed by multiple aftershocks within less than an hour, three of which registering magnitude 5.3. The earthquake itself has been considered an aftershock of the 2011 Tōhoku earthquake which had occurred almost ten years prior.

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On March 20, 2021 at 18:09 JST. The magnitude 6.9 or 7.0 earthquake struck offshore east of Tōhoku, Japan at a depth of 54.0 kilometers (33.6 mi) to 60 kilometers (37 mi). It had a maximum JMA intensity of Shindo 5+ while on the Mercalli intensity scale, it earned a rating of VII. Power outages and some slight damage in Miyagi was reported.

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<span class="mw-page-title-main">2011 Shizuoka earthquake</span> Earthquake in Japan

The 2011 Shizuoka earthquake occurred approximately 42 km (26 mi) north-northeast of Shizuoka City at 22:31 JST, 15 March 2011. The magnitude was Mw  6.0 or MJMA  6.4, and the depth was 9 km (5.6 mi). The hypocenter of this earthquake is thought to have been near the presumed location of the magma chamber of Mount Fuji. It may have been a triggered earthquake caused by the Tohoku earthquake, which occurred four days earlier, on 11 March 2011. It was sinistral strike-slip fault earthquake. It had a maximum JMA intensity of Shindo 6+ (Fujinomiya) or VIII (Severe) on the Mercalli intensity scale. The earthquake left 80 people injured, and caused some power outages.

<span class="mw-page-title-main">2021 Chiba earthquake</span> 2021 earthquake in Japan

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<span class="mw-page-title-main">2022 Fukushima earthquake</span> Severe off-shore earthquake near Fukushima, Japan

On March 16, 2022, at 23:36 JST, a strong earthquake struck off the coast of Fukushima, Japan. The earthquake had a magnitude of 7.4 according to the Japanese Meteorological Agency (JMA), while the United States Geological Survey (USGS) gave an estimate of 7.3. Immediately after the event a 30‑cm tsunami was reported. The event is known in Japanese as Fukushima-ken Oki Jishin. As a result of this natural disaster, four people died and 247 were injured.

<span class="mw-page-title-main">2023 Noto earthquake</span> Earthquake in Japan

On 5 May 2023, a MJMA 6.5 or Mw 6.3 earthquake struck off the coast of Ishikawa Prefecture, Japan. It was located 49 kilometres northeast of Anamizu, Hōsu District, with the town of Suzu closest to the epicenter.

References

USGS

  1. ↑ Magnitude 7.2 – NEAR THE EAST COAST OF HONSHU, JAPAN Archived 2011-03-10 at the Wayback Machine . Earthquake.usgs.gov. Retrieved on 2011-04-12.
  2. ↑ https://earthquake.usgs.gov/earthquakes/eventpage/official20110311054624120_30/executive Archived 2011-03-13 at the Wayback Machine . Earthquake.usgs.gov (2011-03-14). Retrieved on 2011-04-12.
  3. ↑ : Preliminary Earthquake Report: NEAR THE EAST COAST OF HONSHU, JAPAN Archived 2011-04-12 at the Wayback Machine , USGS Earthquake Hazards Program (2011-03-11). Retrieved on 2011-04-12.
  4. ↑ USGS Earthquake Hazards Program: Preliminary Earthquake Report: OFF THE EAST COAST OF HONSHU, JAPAN Archived 2011-04-12 at the Wayback Machine . Neic.usgs.gov (2011-03-11). Retrieved on 2011-04-12.
  5. ↑ Magnitude 7.1 – NEAR THE EAST COAST OF HONSHU, JAPAN Archived 2011-04-14 at the Wayback Machine . Earthquake.usgs.gov. Retrieved on 2011-04-12.
  6. ↑ Magnitude 6.6 – EASTERN HONSHU, JAPAN Archived 2011-04-16 at the Wayback Machine . Earthquake.usgs.gov. Retrieved on 2011-04-12.
  7. ↑ "Magnitude 7.0 - Off the East Coast of Honshu, Japan 2011 July 10 00:57:12 UTC". Archived from the original on 2011-10-15. Retrieved 2017-07-23.
  8. ↑ "undefined". Archived from the original on 2019-02-04. Retrieved 2017-09-03.
  9. ↑ "undefined". Archived from the original on 2013-10-27. Retrieved 2017-09-03.
  10. ↑ USGS Earthquake Hazards Program: Preliminary Earthquake Report: NEAR THE WEST COAST OF HONSHU, JAPAN [ permanent dead link ]. Neic.usgs.gov. Retrieved on 2011-04-12.
  11. ↑ USGS Earthquake Hazards Program: Preliminary Earthquake Report: EASTERN HONSHU, JAPAN [ permanent dead link ]. Neic.usgs.gov (2011-03-15). Retrieved on 2011-04-12.

Other

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 震度データベース検索 Archived 2013-02-13 at the Wayback Machine . Japan Meteorological Agency. Retrieved on 2013-02-18.
  2. 1 2 3 「平成23 年(2011 年)東北地方太平洋沖地震」について（第28 報） Archived 2011-04-09 at the Wayback Machine (Press Release), 25 March 2011. Published by Japan Meteorological Agency.
  3. ↑ "2011年3月11日 東北地方太平洋沖地震（M9.0）の特集 – 東北大学 地震・噴火予知研究観測センター". Archived from the original on 2012-01-19. Retrieved 2011-12-02.
  4. ↑ 「日本付近で発生した主な被害地震（平成８年以降） Archived 2017-07-29 at the Wayback Machine 」JMA, Access date March 5, 2017
  5. ↑ 平成23年3月10日（06時23分）の三陸沖の地震で発表した津波注意報について Archived 2018-06-21 at the Wayback Machine JMA
  6. ↑ "平成23年（2011年）東北地方太平洋沖地震（東日本大震災）について（第162報）（令和4年3月8日）" [Press release no. 162 of the 2011 Tohuku earthquake](PDF). 総務省消防庁災害対策本部[ Fire and Disaster Management Agency ]. Archived from the original (PDF) on 2022-08-27. Retrieved 2022-09-23. Page 31 of the PDF file.
  7. ↑ "平成23年（2011年）東北地方太平洋沖地震（東日本大震災）について（第162報）（令和4年3月8日）" [Press release no. 162 of the 2011 Tohuku earthquake](PDF). 総務省消防庁災害対策本部[ Fire and Disaster Management Agency ]. Archived from the original (PDF) on 2022-08-27. Retrieved 2022-09-23. Page 31 of the PDF file.
  8. ↑ asahi.com（朝日新聞社）：東北の広域停電、完全復旧めどたたず 余震死者２人 – 東日本大震災 Archived 2011-04-14 at the Wayback Machine . Asahi.com (2011-04-08). Retrieved on 2011-04-12.
  9. ↑ ７日の地震 ４人死亡１４１人けが NHKニュース Archived 2011-04-11 at the Wayback Machine . .nhk.or.jp. Retrieved on 2011-04-12.
  10. ↑ "At least 6 killed in new Japan earthquake". CNN. 11 April 2011. Archived from the original on 2 June 2011. Retrieved 2011-04-23.
  11. ↑ "Archived copy". Archived from the original on 2011-07-11. Retrieved 2011-07-10.{{cite web}}: CS1 maint: archived copy as title (link)
  12. ↑ Japanese Quake Stirs On-Air Alarm, but No Damage to Nuclear Plants Is Reported Archived 2018-02-03 at the Wayback Machine , New York Times
  13. ↑ "津波注意報、岩手・宮城は地震４０分後「精査に時間」：朝日新聞デジタル". Archived from the original on 2013-10-29. Retrieved 2013-10-26.
  14. ↑ "1st death confirmed in Feb. 13 northeastern Japan earthquake". Kyodo News. Kyodo News. 25 February 2021. Archived from the original on 25 February 2021. Retrieved 25 February 2021.
  15. ↑ "Large earthquake was an aftershock of 3/11 killer quake, expert says". The Japan Times. Archived from the original on 14 February 2021. Retrieved 14 February 2021.
  16. ↑ "宮城県沖を震源とする地震による被害及び 消防機関等の対応状況（第６報" (PDF). Fire and Disaster Management Agency Disaster Countermeasures Headquarters (in Japanese). 22 March 2021. Archived (PDF) from the original on 23 March 2021. Retrieved 22 March 2021.
  17. ↑ 静岡東部の震度６強、東海地震誘発せず…専門家 : 科学 : YOMIURI ONLINE（読売新聞） Archived 2011-03-19 at the Wayback Machine . Yomiuri.co.jp. Retrieved on 2011-04-12.
  18. ↑ 2011年3月 東北地方太平洋沖地震 | 広報アウトリーチ室 Archived 2011-04-21 at the Wayback Machine . Outreach.eri.u-tokyo.ac.jp. Retrieved on 2011-04-12.
  19. 1 2 3 「平成23年（2011年）東北地方太平洋沖地震」について（第38報） Archived 2018-03-23 at the Wayback Machine (Press Release), 12 April 2011. Published by Japan Meteorological Agency. Retrieved on 2013-02-17.
  20. ↑ "３月15日静岡県東部の地震に関する被害情報（第５ 報）" (PDF). Archived from the original (PDF) on 27 September 2011. Retrieved 9 September 2022. "Archived copy" (PDF). Archived from the original on 2011-09-27. Retrieved 2011-04-23.{{cite web}}: CS1 maint: archived copy as title (link) CS1 maint: bot: original URL status unknown (link)
  21. ↑ ２０１１年３月１５日静岡県東部の地震の評価 Archived 2011-04-25 at the Wayback Machine . Jishin.go.jp. Retrieved on 2011-04-17.
  22. ↑ 東日本沖巨大地震 Archived 2011-03-24 at the Wayback Machine . Sk01.ed.shizuoka.ac.jp. Retrieved on 2011-04-12.
  23. ↑ "M 6.8 - 38 km ESE of Ishinomaki, Japan". United States Geological Survey. May 1, 2021. Archived from the original on 2021-05-01. Retrieved 2021-05-01.
  24. ↑ "6.8-Magnitude Quake Rattles Northeast Japan, No Tsunami Risk". Channels Television. Archived from the original on 2021-05-01. Retrieved 2021-05-01.
  25. ↑ "地震による原発の異常なし、４人死亡・９７人負傷…参院予算委で首相" [No abnormalities in the nuclear power plant due to the earthquake, 4 people died, 97 people injured ... Prime Minister at the House of Councilors Budget Committee] (in Japanese). Yahoo News Japan. 17 March 2022. Archived from the original on 17 March 2022. Retrieved 17 March 2022.
  26. ↑ "地震【随時更新】宮城・福島で震度6強 被害状況は" [Earthquake [Updated from time to time] Seismic intensity 6 strong in Miyagi and Fukushima]. NHK (in Japanese). 17 March 2022. Archived from the original on 16 March 2022. Retrieved 17 March 2022.
  27. ↑ "地震 宮城 福島で震度6強 3人死亡 225人けが（19:00）". NHK. 16 March 2022. Archived from the original on 17 March 2022. Retrieved 17 March 2022.
  28. ↑ "宮城、福島で震度６強 けが人、搬送相次ぐ" [Injured people with seismic intensity 6 or higher in Miyagi and Fukushima, one after another]. Okinawa Times (in Japanese). Kyodo News. 17 March 2022. Archived from the original on 16 March 2022. Retrieved 16 March 2022.
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