The Japan Meteorological Agency revised the Tohoku Region Pacific Offshore Earthquake to M9.0 and found it to be the largest earthquake in the world since the 20th century

From M8.8 to M9.0 for the Tohoku Region Pacific Offshore Earthquake occurred at 14:46 on March 11 at Sanriku (about 130 km east of the Oshika Peninsula, about 130 km) and a depth of about 24 km (provisional value) It was fixed.

In addition, it is thought that aftershocks with seismic intensity of 5 or less occur occasionally, and in some cases it is highly likely that aftershocks of intensity 6 to 6 will be generated. "

Details are as below.
On the "2011 Tohoku Region Pacific Coast Earthquake" (Part 16)
http://www.jma.go.jp/jma/press/1103/13c/201103131830.html

Although the announced tsunami warning report is all released at 17:58, there is a possibility that a tsunami may occur again depending on the scale when an aftershock occurs.

I canceled the tsunami warning but it is highly likely that some sea level change will continue for about one day in the future. For this reason, please go after confirming safety enough when entering the sea and working. Also, if a big aftershock occurs, there is a possibility that a tsunami may be generated, so please be aware that tsunami warnings and tsunami warnings may be announced. If you act outdoors, etc., you may have many dangerous parts due to the tsunami and earthquake shaking, there is a danger of secondary disaster, so please follow the instructions of the municipal disaster prevention personnel etc. sufficiently safe Please be sure to check and act. Since there are dangers such as landslide disasters and houses collapsing in regions where the tremors were strong, please keep vigilant against strong shakes due to aftershocks.

The situation of aftershocks of M 7.0 and above is summarized as follows.


Furthermore, when space-time distribution is distributed in the above rectangle, it becomes like this.


Incidentally, the large earthquakes after the 20th century are as follows.

1952: Kamchatka earthquake, M9.0
1957: Aleutian earthquake, M9.0
1960:Chile earthquake, M 9.5
1964:Alaska earthquake, M 9.2
2004:Earthquake off Sumatra Island, M 9.1
2011: Tohoku Region Pacific Coast Earthquake, M9.0