TY JOUR TI Mega-earthquake on 11 March 2011 in Japan and aftershock process dynamics' development KW Large earthquake KW recurrence of the large earthquakes KW seismic gap KW mega-earthquake KW aftershock sequence KW strongest aftershock KW field of aftershocks' epicenters KW probable scenario JO Russian Journal of Earth Sciences AU Tikhonov, I.N. PY 2011 IS 12 PB Geophysical Center of the Russian Academy of Sciences