he 2011 earthquake off the Pacific coast of Tōhoku, also known as the 2011 Tohoku earthquake, the Great East Japan Earthquake and the 3rd of March Earthquake, was a magnitude 9.0 undersea earthquake off the coast of Japan that occurred at 14:46 JST (Japan Standard Time) on Friday, 11 March 2011, with the epicentre approximately 70 kilometres east of the Oshika Peninsula of Tōhoku and the hypocentre at an underwater depth of approximately 32 km.