Mezue ahịrịokwu na-esonụ: Nnukwu ala ọma jijiji na-eme na njikọ na mpaghara gburugburu Nazca Ridge subduction mpaghara, mara na Peru megathrust. Ndị a gụnyere, mana ha ejighi oke, ala ọma jijiji nke ịdị ukwuu 8.1 na 1942, ala ọma jijiji nke ịdị ukwuu 8.0 na 1970, ala ọma jijiji nke ịdị ukwuu 7.7 na 1996, ala ọma jijiji nke ịdị ukwuu 8.4 na 2001, na ala ọma jijiji nke ịdị ukwuu 8.4 na 2001.
Ala ọma jijiji dị 8.0 mere n'afọ 2007. Ihe ndekọ ala ọma jijiji e nwere n'ógbè a e ji mmiri mee malitere laa azụ na 1586. A na-achọta ọgbaghara ndị a niile ma ọ bụ n'ụsọ oké osimiri nke Peru ma ọ bụ n'ime Peru-Chile Trench n'etiti 9 ° S na 18 ° S, nke dabara na Nazca Ridge, ma gụnye ma intraplate na interplate rupturing. Enweghi nnukwu ala ọma jijiji dị n'etiti 14°S na 15.5°S, ebe bathymetric dị elu nke ugwu ahụ na-agbada. Ala ọma jijiji ndị na-eme n'etiti etiti anaghị eme n'otu oge na Nazca Ridge.