Dee ihe ọzọ maka paragraf a - Los Angeles na-enwekarị ala ọma jijiji n'ihi ebe ọ dị na Pacific Ring of Fire. Enweghị nkwụsi ike nke mbara ala emewo ka e nwee ọtụtụ mmebi, bụ́ ndị na-akpata ihe dị ka ala ọma jijiji 10,000 kwa afọ n'Ebe Ndịda California, ọ bụ ezie na ihe ka ọtụtụ n'ime ha dị nnọọ obere nke na a dịghị enwe mmetụta ha. Usoro mmebi San Andreas, nke na-anọdụ n'ókè dị n'etiti Pacific Plate na North American Plate, na-agafe n'ógbè Los Angeles. Akụkụ nke mmebi ahụ na-agafe na Southern California na-enwe ala ọma jijiji dị ukwuu ihe dị ka afọ 110 ruo 140 ọ bụla, ndị ọkà mmụta banyere ala ọma jijiji adọwokwa aka ná ntị banyere "nnukwu" nke na-esote, dị ka nnukwu ala ọma jijiji ikpeazụ bụ ala ọma jijiji Fort Tejon nke 1857. Ókèala Los Angeles na ógbè ndị dị n'ime ya nọkwa n'ihe ize ndụ nke oké ala ọma jijiji. Nnukwu ala ọma jijiji ndị metụrụ mpaghara Los Angeles gụnyere 1933 Long Beach, 1971 San Fernando, 1987 Whittier Narrows, na 1994 Northridge ihe. Ọ bụ nanị ole na ole n'ime ha ka a na-anaghị enwe mmetụta ha n'ahụ́ mmadụ. USGS ewepụtala amụma ala ọma jijiji nke UCERF California, nke na-eme ka ala ọma jijiji na California. Akụkụ ụfọdụ nke obodo ahụ na - enwekwa ike ịdaba na tsunamis; e mebiri ebe ndị dị n'ọdụ ụgbọ mmiri n'ihi ebili mmiri nke ala ọma jijiji nke mere n'agwaetiti Aleutian
ala ọma jijiji Valdivia n'afọ 1960, ala ọma jijiji Alaska n'afọ 1964, ala ọma jijiji Chile n'afọ 2010 na ala ọma jijiji Japan n'afọ 2011.