Tōhoku Earthquake'. NHK used Tōhoku Kantō Great Earthquake disaster (東北関東大震災, Tōhoku Kantō Daishinsai); Tōhoku-Kantō Great earthquake (東北・関東大地震, Tōhoku-Kantō
and aftershocks of the 2011Tōhokuearthquake. Japan had experienced 900 aftershocks after the M9.1 earthquake on March 11, 2011 with about 60 aftershocks
The earthquake had an estimated magnitude of at least 8.6 on the moment magnitude scale, but may have been as high as 9.0, similar to the 2011Tōhoku earthquake