Mezue nkebi ahịrịokwu a: Otu n'ime ihe ndị mere na Simi Valley dị nso n'Ugwu Simi bụ na ọ dị n'ebe ọkụ ọgbụgba ndị na-agba n'ugwu ndị dị n'Ebe Ndịda Kalịfọnịa kwa afọ ole na ole na-adịkarị. Simi Valley nọkwa n'ihe ize ndụ nke ala ọma jijiji. Ndagwurugwu gbara ya gburugburu; ndị kacha nso bụ Santa Rosa Fault na Northwest, Northridge Hills Fault na Northeast, na Chatsworth Fault na South. N'afọ 1994, akụkụ ụfọdụ nke Simi Valley merụrụ nnukwu ihe site n'oké ifufe ahụ.
Ala ọma jijiji mere na Northridge. Lee ihe mberede nuklia na SSFL maka ozi gbasara ihe mberede na ihe ize ndụ metụtara ya maka ndị bi na ya.