Mezue nkebi ahịrịokwu a: Ịchọpụta ebe ala ọma jijiji mere na ịmata mgbe o mere bụ otu n'ime ihe ndị dị mkpa a na-eme n'ihe ọmụmụ ala ọma jijiji oge ochie. Otú ala ọma jijiji ndị e nwere n'oge ochie haruru nwere ike inyere anyị aka ịmata otú ala ọma jijiji ndị e nwere n'oge ochie haruru, ma ọ bụkwanụ mee ka anyị mata ihe ndị mere n'oge ochie. N'ihe banyere ala ọma jijiji nke 869 Sanriku, njirimara nke mkpofu tsunami karịrị 4.5 km n'ime ala na Sendai Plain, nke dị nso na ihe omume tsunami mere n'oge gara aga, mere ka o kwe omume ịtụle ịdị ukwuu nke ala ọma jijiji a na mpaghara mgbawa nwere ike ịdị na mmiri. A chọpụtara ebe abụọ a na-egwute ọla n'oge gara aga, bụ́ ndị yiri ibe ha, e nyekwara ha ụbọchị ha mere. E ji ihe atọ ndị ahụ e gwutere n'ala mee ihe iji gosi na ala ọma jijiji ndị na-eme ka e nwee ala ọma jijiji n'akụkụ ụsọ oké osimiri Sendai na-eme ugboro ugboro ruo ihe dị ka afọ 1,000, na-egosi na oge eruola ka ihe a mee ọzọ nakwa na o yikarịrị ka e nwere nnukwu idei mmiri. N'afọ 2007, e kwuru na ọ bụrụ na ala ọma jijiji emee n'oké osimiri a n'ime afọ iri atọ na-abịanụ, ọ ga-eme ka ala ọma jijiji mee n'ebe a. Dabere na akụkụ nke ozi a TEPCO gbanwere atụmatụ nke ịdị elu nke tsunami na Fukushima Daiichi Nuclear Power Plant ka ọ dị elu karịa 9 m, mana emeghị ihe ozugbo. Oké ifufe nke oké osimiri ahụ kpatara
Ala ọma jijiji nke 2011 Tohoku nwere ịdị elu ebili mmiri na Fukushima nke ihe dị ka mita 15, nke dị elu karịa mita 5.7 nke e mere maka nchebe nke osisi ahụ. Ebe idei mmiri nke oké ifufe ahụ mere bụ ihe fọrọ nke nta ka ọ bụrụ otu ihe ahụ a kọrọ banyere ihe atọ ahụ mere n'oge gara aga, dị ka ọ dị n'akụkụ.