Mezue ahịrịokwu na-esonụ: Japan bụ akụkụ nke ihe a na-akpọ Ring of Fire, ọ bụghị nanị na ọ na-enwu ọkụ, kamakwa ọ bụ otu n'ime ógbè ndị kasị nwee ala ọma jijiji n'ụwa. Ala ọma jijiji ndị kasị ukwuu na-eme n'ógbè ndị e nwere ala ọma jijiji n'ebe ọwụwa anyanwụ nke ụsọ oké osimiri Japan. Ala ọma jijiji nke 9.1 megathrust nke ụgbọ mmiri na-asọ n'okpuru mmiri
Oke osimiri Tōhoku n'ọnwa Machị afọ 2011 nke kpatara oke mmiri ozuzo bụ nsonaazụ nke mgbawa na interface megathrust subduction.