Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Ebe a na-agafe agafe: N'ime ọnwa atọ n'afọ 1985, a chọpụtara obere ala ọma jijiji 3,000 n'ebe ugwu ọdịda anyanwụ nke ogige ahụ, n'oge a na-akpọ oge ala ọma jijiji na-eme, bụ́kwa nke a sịrị na ọ bụ obere ala ọma jijiji mere ka ugwu ahụ dị na Yellowstone maa jijiji. Malite n'Eprel 30, 2007, obere ala ọma jijiji iri na isii ruru ihe dị ka magnitude 2.7 mere na Yellowstone Caldera ruo ọtụtụ ụbọchị. A na-enwekarị ụdị ala ọma jijiji ndị a, e nweekwala iri asaa n'ime ha n'agbata afọ 1983 na afọ 2008. Na December 2008, e nwere ihe karịrị ala ọma jijiji 250 mere n'ime ụbọchị anọ n'okpuru Ọdọ Mmiri Yellowstone, nke kasị ukwuu n'ime ha dị n'ike nke 3.9. Na Jenụwarị 2010, e nwere ihe karịrị ala ọma jijiji iri abụọ na ise mere naanị n'ime ụbọchị abụọ. Ọrụ ala ọma jijiji na Yellowstone National Park na-aga n'ihu ma na-akọ kwa elekere site na Mmemme Ihe Egwu Ala Ọma Jijiji nke US Geological Survey. Na Machị 30, 2014, ala ọma jijiji nke 4.8 kụrụ ihe fọrọ nke nta ka ọ bụrụ etiti Yellowstone dị nso na Norris Basin na 6: 34 am; akụkọ gosiri na ọ dịghị mmebi. Nke a bụ ala ọma jijiji kasị njọ metụrụla ogige ntụrụndụ ahụ kemgbe February 22, 1980.  Ajụjụ: Ala ọma jijiji ole mere na Disemba 2008 n'Ọdọ Mmiri Yellowstone?
ihe karịrị 250