Mezue ahịrịokwu na-esonụ: Ọdọ Mmiri Japan bụ akụkụ nke Ọdọ Mmiri Pacific nke dị n'ebe ugwu ọwụwa anyanwụ Japan. Ọ na-esite n'Agwaetiti Kuril ruo na nsọtụ ugwu nke Agwaetiti Izu, ọ dịkwa n'ebe kasị dị omimi. Ọ na-ejikọ Kuril<unk>Kamchatka Trench na ugwu na Izu<unk>Ogasawara Trench na ndịda ya na ogologo nke. A na-eme ọgba a ka efere Pacific nke oke osimiri na-agbada n'okpuru Okhotsk Plate nke kọntinent (microplate nke bụbu akụkụ nke North American Plate). N'ihi nke a, a na-enwe ọgba miri emi n'ala ahụ. Ọganihu na-aga n'ihu na mpaghara subduction jikọtara ya na Japan Trench bụ otu n'ime isi ihe na-akpata tsunami na ala ọma jijiji n'ebe ugwu Japan, gụnyere megathrust
Ala ọma jijiji nke Tōhoku na nke kpatara tsunami nke mere na 11 Machị 2011. A na-edekọ ọnụego nke subduction jikọtara na Japan Trench na ihe dị ka / afọ.