Mezue nkebi ahịrịokwu na-esonụ: Nnyocha a gosikwara na ihe ize ndụ nke oké ala ọma jijiji pụrụ ịdị na-amụba ngwa ngwa karịa ka ndị ọkà mmụta sayensị kwenyere na mbụ. Ọzọkwa, ihe ize ndụ a na-elekwasị anya ugbu a n'akụkụ ndịda nke mmebi ahụ, ya bụ, mpaghara dị gburugburu Los Angeles, n'ihi na nnukwu ala ọma jijiji mere na nso nso a na etiti (1857) na ugwu (
1906) nke mmebi ahụ, ebe akụkụ ndịda ahụ ahụbeghị ụdị mmebi ahụ ma ọ dịkarịa ala afọ 300. Dị ka ọmụmụ a si kwuo, nnukwu ala ọma jijiji nke ga-eme n'akụkụ ndịda nke San Andreas ga-akpata nnukwu mmebi na mpaghara Palm Springs <unk> Indio na obodo ndị ọzọ dị na San Bernardino, Riverside na Imperial counties na California, na Mexicali Municipality na Baja California. A ga-enwe mmetụta siri ike (ma nwee ike ibute nnukwu mbibi) n'akụkụ niile nke Southern California, gụnyere mpaghara ndị mmadụ bi na Los Angeles County, Ventura County, Orange County, San Diego County, Ensenada Municipality na Tijuana Municipality, Baja California, San Luis Rio Colorado na Sonora na Yuma, Arizona. Ụlọ ndị merela ochie ga-akacha emebi ma ọ bụ daa, dị ka ụlọ ndị e wuru n'elu nkume na-adịghị ike ma ọ bụ n'ógbè ndị dị n'ụsọ oké osimiri ebe mmiri dị elu (ma si otú a na-eme ka ala dị mmiri mmiri). Akwụkwọ akụkọ ahụ kwubiri, sị: