List of foreshocks and aftershocks of the 2011 Tōhoku earthquake
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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.
Foreshocks
[edit]Japan Time | Magnitude | Coordinates | Depth | Intensity (shindo)[1] | Comment |
---|---|---|---|---|---|
2011-03-09 11:45 | Mw 7.3, Mj 7.3[2] | 38°25′26″N 142°50′10″E / 38.424°N 142.836°E | 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 06:23 | Mw 6.4, Mj 6.8 | 38°10′16″N 143°02′35″E / 38.171°N 143.043°E | 9 km | 4 | Caused 11 cm Tsunami.[5] |
Main shock
[edit]Japan Time | Magnitude | Coordinates | Depth | Intensity (shindo)[1] | Comment |
---|---|---|---|---|---|
2011-03-11 14:46 | Mw 9.1, Mj 8.4[2] | 38°19′19″N 142°22′08″E / 38.322°N 142.369°E | 29 km[USGS 2] | 7 | [6] 2,553 people missing[7], tsunami, nuclear incidents. | 19,759 deaths,
Aftershocks
[edit]Japan Time | Magnitude | Coordinates | Depth | Intensity (shindo)[1] | Comment |
---|---|---|---|---|---|
2011-03-11 15:08 | Mj 7.4[1] | 39°49′12″N 139°01′30″E / 39.82°N 139.025°E | 32 km[1] | 5- | |
2011-03-11 15:15 | Mw 7.9, Mj 7.6[1] | 36°16′N 141°08′E / 36.27°N 141.14°E | 43 km[USGS 3] | 6+ | |
2011-03-11 15:25 | Mw 7.7, Mj 7.5[1] | 38°03′N 144°35′E / 38.05°N 144.59°E | 19 km[USGS 4] | 4 | |
2011-04-07 23:32 | Mw 7.1, Mj 7.2[1] | 38°15′11″N 141°38′24″E / 38.253°N 141.640°E | 42 km[USGS 5] | 6+ | [8][9] | 4 dead, 100+ injured, large scale power outage in Tōhoku region.
2011-04-11 17:16 | Mw 6.6, Mj 7.0[1] | 37°00′25″N 140°28′37″E / 37.007°N 140.477°E | 10 km[USGS 6] | 6- | Iwaki, Fukushima.[10] | 6 dead, several injured, localized power outage and landslides in
2011-04-12 14:07 | Mj 6.4[1] | 37°03′07″N 140°38′35″E / 37.052°N 140.643°E | 15 km[1] | 6- | |
2011-07-10 09:57 | Mw 7.0, Mj 7.3[1] | 38°02′24″N 143°17′13″E / 38.040°N 143.287°E | 23 km[USGS 7] | 4 | 10 cm of tsunami in Sōma and Ōfunato.[11] |
2012-12-07 17:18 | Mw 7.3[1] | 37°48′N 144°12′E / 37.8°N 144.2°E | 49 km (JMA)[1] 36 km [USGS 8] |
5- | National Earthquake Information Center in Colorado, USA.[12] | Tsunami under 1 meter. Considered an aftershock by the
2013-10-26 02:10 | Mw 7.1 | 37°10′12″N 144°39′54″E / 37.170°N 144.665°E | 10 km [USGS 9] | 4 | Tsunami[13] |
2016-11-22 05:59 | Mw 6.9 | 37°23′35″N 141°23′13″E / 37.393°N 141.387°E | 9 km | 5- | |
2021-02-13 23:07:49 | Mw 7.1 MJMA 7.3 |
37°41′10″N 141°59′31″E / 37.686°N 141.992°E | 35 km (USGS) 55 km (JMA) |
6+ | [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] | This earthquake resulted in at least 1 death and left at least 185 injured.
2021-03-20 18:09:45 | Mw 7.0 MJMA 6.9 |
38°28′30″N 141°36′25″E / 38.475°N 141.607°E | 54 km (USGS) 60 km (JMA) |
5+ | [16] | 11 people injured.
Possibly related earthquakes
[edit]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 Time | Magnitude | Coordinates | Depth | Intensity (shindo)[1] | Comment |
---|---|---|---|---|---|
2011-03-12 03:59 | Mw 6.3, Mj 6.7[1] | 37°01′N 138°22′E / 37.02°N 138.36°E | 8 km[1] 2 km[USGS 10] |
6+ | Possibly a triggered earthquake.[18][19] |
2011-03-12 04:31 | Mj 5.9[1] | 36°56′53″N 138°34′19″E / 36.948°N 138.572°E | 1 km[1] | 6- | Possibly a triggered earthquake.[19] |
2011-03-12 05:42 | Mj 5.3[1] | 36°58′19″N 138°35′24″E / 36.972°N 138.59°E | 2 km[1] | 6- | Possibly a triggered earthquake.[19] |
2011-03-15 22:31 | Mw 6.0, Mj 6.4[2] | 35°17′N 138°32′E / 35.29°N 138.54°E | 9 km[USGS 11] | 6+ | [20] Near presumed location of magma chamber of Mount Fuji. Sinistral strike-slip fault.[21] Possibly a triggered earthquake.[22] | 50 injured. Power outage.
2021-05-01 10:27:27[23] | Mw 6.8 | 38°13′48″N 141°39′54″E / 38.230°N 141.665°E | 47 km | 5+ | Three people were injured by the strong shaking.[24] |
2022-03-16 23:36:33 | Mw 7.3 MJMA 7.4 |
37°42′07″N 141°35′13″E / 37.702°N 141.587°E | 63.1 km (USGS) 57 km (JMA) |
6+ | [25][26][27] An estimated 2.2 million households from 13 prefectures and one metropolitan area were left without power.[28] | A tsunami advisory was issued by the Japan Meteorological Agency for this earthquake. There was 4 dead and 225 injured.
References
[edit]USGS
[edit]- ^ 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.
- ^ 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.
- ^ : 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.
- ^ 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.
- ^ 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.
- ^ Magnitude 6.6 – EASTERN HONSHU, JAPAN Archived 2011-04-16 at the Wayback Machine. Earthquake.usgs.gov. Retrieved on 2011-04-12.
- ^ "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.
- ^ "undefined". Archived from the original on 2019-02-04. Retrieved 2017-09-03.
- ^ "undefined". Archived from the original on 2013-10-27. Retrieved 2017-09-03.
- ^ 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.
- ^ 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
[edit]- ^ a b c d e f g h i j k l m n o p q r s t u 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.
- ^ a b c 「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.
- ^ "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.
- ^ 「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
- ^ 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
- ^ "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.
- ^ "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.
- ^ 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.
- ^ 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.
- ^ CNN Wire Staff (11 April 2011). "At least 6 killed in new Japan earthquake". articles.cnn.com. CNN World News. Archived from the original on 2 June 2011. Retrieved 2011-04-23.
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- ^ 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.
- ^ 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.
- ^ a b c 「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.
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