List of foreshocks and aftershocks of the 2011 Tōhoku earthquake

This is a list of foreshocks and aftershocks of the 2011 Tōhoku earthquake. By 14 March 2012, Japan had experienced over 900 aftershocks after the magnitude 9.0 (Mw) 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 or Mw refer to the moment magnitude scale, while Mjma, Mjma, or Mj refer to the JMA magnitude scale.

Contents

Foreshock

Japan Time Magnitude Latitude Longitude Depth Intensity (shindo) Comment
2011-03-09 11:45 Mw 7.2, Mj 7.3[1] 38.424°N 142.836°E 32 km[USGS 1] lower 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.[2]

Main shock

Japan Time Magnitude Latitude Longitude Depth Intensity (shindo) Comment
2011-03-11 14:46 Mw 9.0, Mj 8.4[1] 38.322°N 142.369°E 32 km[USGS 2] 7
Further information: 2011 Tōhoku earthquake and tsunami
At least 15,000 dead, at least 4,000 missing, tsunami, nuclear incidents.

Aftershocks

Japan Time Magnitude Latitude Longitude Depth Intensity (shindo) Comment
2011-03-11 15:15 Mw 7.9, Mj 7.4[1] 36.27°N 141.14°E 35 km[USGS 3] lower 6
2011-03-11 15:25 Mw 7.7, Mj 7.5[1] 38.05°N 144.59°E 18 km[USGS 4]
2011-04-07 23:32 Mw 7.1, Mj 7.4[3] 38.253°N 141.640°E 49 km[USGS 5] upper 6
Further information: April 2011 Miyagi earthquake
4 dead, 100+ injured, large scale power outage in Tōhoku region.[4][5]
2011-04-11 17:16 Mw 6.6, Mj 7.1[3] 37.007°N 140.477°E 10 km[USGS 6] lower 6
Further information: April 2011 Fukushima earthquake
6 dead, several injured, localized power outage and landslides in Fukushima.[6]
2011-07-10 09:57 Mw 7.0, Mj 7.1[7] 38.040°N 143.287°E 18 km[USGS 7] 4 10 cm of tsunami in Sōma and Ōfunato.[8]

Possibly related earthquakes

The following earthquakes are possibly related to the 2011 Tōhoku earthquake. However, agreement toward the relationships has not been reached among the researchers.[9]

Japan Time Magnitude Latitude Longitude Depth Intensity (shindo) Comment
2011-03-12 03:59 Mw 6.3, Mj 6.7[1] 37.02° N 138.36°E 2 km[USGS 8] upper 6 Possibly a triggered earthquake.[10]
2011-03-15 22:31 Mw 6.0, Mj 6.4[1] 35.29°N 138.54°E 9 km[USGS 9] upper 6 50 injured. Power outage.[11] Near presumed location of magma chamber of Mount Fuji.
Sinistral strike-slip fault.[12] Possibly a triggered earthquake.[13]

References

USGS

  1. ^ Magnitude 7.2 – NEAR THE EAST COAST OF HONSHU, JAPAN. Earthquake.usgs.gov. Retrieved on 2011-04-12.
  2. ^ Magnitude 9.0 – NEAR THE EAST COAST OF HONSHU, JAPAN. Earthquake.usgs.gov (2011-03-14). Retrieved on 2011-04-12.
  3. ^ USGS Earthquake Hazards Program: Preliminary Earthquake Report: NEAR THE EAST COAST OF HONSHU, JAPAN. Neic.usgs.gov (2011-03-11). Retrieved on 2011-04-12.
  4. ^ USGS Earthquake Hazards Program: Preliminary Earthquake Report: OFF THE EAST COAST OF HONSHU, JAPAN. Neic.usgs.gov (2011-03-11). Retrieved on 2011-04-12.
  5. ^ Magnitude 7.1 – NEAR THE EAST COAST OF HONSHU, JAPAN. Earthquake.usgs.gov. Retrieved on 2011-04-12.
  6. ^ Magnitude 6.6 – EASTERN HONSHU, JAPAN. Earthquake.usgs.gov. Retrieved on 2011-04-12.
  7. ^ http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc0004sg6.php
  8. ^ USGS Earthquake Hazards Program: Preliminary Earthquake Report: NEAR THE WEST COAST OF HONSHU, JAPAN. Neic.usgs.gov. Retrieved on 2011-04-12.
  9. ^ USGS Earthquake Hazards Program: Preliminary Earthquake Report: EASTERN HONSHU, JAPAN. Neic.usgs.gov (2011-03-15). Retrieved on 2011-04-12.

Other

  1. ^ a b c d e f 「平成23 年(2011 年)東北地方太平洋沖地震」について（第28 報）, 25 March 2011. Published by JMA
  2. ^ http://www.aob.geophys.tohoku.ac.jp/info/topics/20110311_news/
  3. ^ a b Earthquake Information 2011/04 (UT). Fnet.bosai.go.jp (2011-04-13). Retrieved on 2011-04-17.
  4. ^ 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. Asahi.com (2011-04-08). Retrieved on 2011-04-12.
  5. ^ ７日の地震 ４人死亡１４１人けが NHKニュース. .nhk.or.jp. Retrieved on 2011-04-12.
  6. ^ CNN Wire Staff (11 April, 2011). "At least 6 killed in new Japan earthquake". articles.cnn.com. CNN World News. http://articles.cnn.com/2011-04-11/world/japan.quake_1_fukushima-daiichi-nuclear-plant-tsunami-quake. Retrieved 2011-04-23. 
  7. ^ 気象上 {{|}} 地震情報 (JMA - Earthquake Information)
  8. ^ http://www.asahi.com/national/update/0710/TKY201107100080.html
  9. ^ 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）. Yomiuri.co.jp. Retrieved on 2011-04-12.
  10. ^ 2011年3月 東北地方太平洋沖地震 | 広報アウトリーチ室. Outreach.eri.u-tokyo.ac.jp. Retrieved on 2011-04-12.
  11. ^ http://www.pref.shizuoka.jp/kinkyu/documents/0315toubujisin5.pdf
  12. ^ ２０１１年３月１５日静岡県東部の地震の評価. Jishin.go.jp. Retrieved on 2011-04-17.
  13. ^ 東日本沖巨大地震. Sk01.ed.shizuoka.ac.jp. Retrieved on 2011-04-12.

External links

Aftermath • Humanitarian response  · Foreshocks and aftershocks
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