This is a list of foreshocks and aftershocks of the 2011 Tōhoku earthquake

2011 Tōhoku earthquake and tsunami

The 2011 earthquake off the Pacific coast of Tohoku, also known as the 2011 Tohoku earthquake, or the Great East Japan Earthquake, was a magnitude 9.0 undersea megathrust earthquake off the coast of Japan that occurred at 14:46 JST on Friday, 11 March 2011, with the epicenter approximately east...

. By , Japan had experienced over 900 aftershocks after the magnitude 9.0 (M_w) 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

Japan Meteorological Agency seismic intensity scale

The Japan Meteorological Agency seismic intensity scale is a seismic scale used in Japan and Taiwan to measure the intensity of earthquakes. It is measured in units of...

 are listed here. Mw or M_w refer to the moment magnitude scale

Moment magnitude scale

The moment magnitude scale is used by seismologists to measure the size of earthquakes in terms of the energy released. The magnitude is based on the seismic moment of the earthquake, which is equal to the rigidity of the Earth multiplied by the average amount of slip on the fault and the size of...

, while Mjma, M_jma, or Mj refer to the JMA magnitude scale.

Foreshock

Japan Time Japan Standard Time Japan Standard Time or JST is the standard timezone of Japan, and is 9 hours ahead of UTC. For example, when it is midnight in UTC, it is 09:00 in Japan Standard Time. There is no daylight saving time, though its introduction has been debated several times. Japan Standard Time is the same as...	Magnitude	Latitude	Longitude	Depth	Intensity (shindo)	Comment
2011-03-09 11:45	Mw 7.2, Mj 7.3	38.424°N	142.836°E	32 kmMagnitude 7.2 – NEAR THE EAST COAST OF HONSHU, JAPAN. Earthquake.usgs.gov. Retrieved on 2011-04-12.	lower 5

Main shock

Japan Time	Magnitude	Latitude	Longitude	Depth	Intensity (shindo)	Comment
2011-03-11 14:46	Mw 9.0, Mj 8.4	38.322°N	142.369°E	32 kmMagnitude 9.0 – NEAR THE EAST COAST OF HONSHU, JAPAN. Earthquake.usgs.gov (2011-03-14). Retrieved on 2011-04-12.	7	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	36.27°N	141.14°E	35 kmUSGS Earthquake Hazards Program: Preliminary Earthquake Report: NEAR THE EAST COAST OF HONSHU, JAPAN. Neic.usgs.gov (2011-03-11). Retrieved on 2011-04-12.	lower 6
2011-03-11 15:25	Mw 7.7, Mj 7.5	38.05°N	144.59°E	18 kmUSGS Earthquake Hazards Program: Preliminary Earthquake Report: OFF THE EAST COAST OF HONSHU, JAPAN. Neic.usgs.gov (2011-03-11). Retrieved on 2011-04-12.
2011-04-07 23:32	Mw 7.1, Mj 7.4	38.253°N	141.640°E	49 kmMagnitude 7.1 – NEAR THE EAST COAST OF HONSHU, JAPAN. Earthquake.usgs.gov. Retrieved on 2011-04-12.	upper 6	4 dead, 100+ injured, large scale power outage in Tōhoku region.
2011-04-11 17:16	Mw 6.6, Mj 7.1	37.007°N	140.477°E	10 kmMagnitude 6.6 – EASTERN HONSHU, JAPAN. Earthquake.usgs.gov. Retrieved on 2011-04-12.	lower 6	6 dead, several injured, localized power outage and landslides in Fukushima Fukushima may refer to:*Fukushima City – the capital city of Fukushima Prefecture, Japan*Fukushima Prefecture – a Japanese prefecture*Two nuclear power plants located in Fukushima Prefecture:**Fukushima Daiichi Nuclear Power Plant... .
2011-07-10 09:57	Mw 7.0, Mj 7.1	38.040°N	143.287°E	18 kmhttp://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc0004sg6.php	4	10 cm of tsunami in Sōma Soma, Fukushima is a coastal city located in Fukushima, Japan, approximately 30 kilometers South of Sendai. Japan National Route 6 runs through Sōma, since 2001 augmented by the Route 6 Sōma Bypass, which runs up to 2 km East of the original route, around the city center....  and Ōfunato Ofunato, Iwate is a coastal city located in Iwate, Japan.It was founded on April 1, 1952.On November 15, 2001, the town of Sanriku, from Kesen District, was merged into Ōfunato.... .

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.

Japan Time	Magnitude	Latitude	Longitude	Depth	Intensity (shindo)	Comment
2011-03-12 03:59	Mw 6.3, Mj 6.7	37.02° N	138.36°E	2 kmUSGS Earthquake Hazards Program: Preliminary Earthquake Report: NEAR THE WEST COAST OF HONSHU, JAPAN. Neic.usgs.gov. Retrieved on 2011-04-12.	upper 6	Possibly a triggered earthquake.
2011-03-15 22:31	Mw 6.0, Mj 6.4	35.29°N	138.54°E	9 kmUSGS Earthquake Hazards Program: Preliminary Earthquake Report: EASTERN HONSHU, JAPAN. Neic.usgs.gov (2011-03-15). Retrieved on 2011-04-12.	upper 6	50 injured. Power outage. Near presumed location of magma chamber of Mount Fuji Mount Fuji is the highest mountain in Japan at . An active stratovolcano that last erupted in 1707–08, Mount Fuji lies about south-west of Tokyo, and can be seen from there on a clear day. Mount Fuji's exceptionally symmetrical cone is a well-known symbol of Japan and it is frequently depicted in art and... . Sinistral strike-slip fault. Possibly a triggered earthquake.

External links

• About triggered earthquakes in the inland area of the Japanese archipelago (Nagoya University)