N'oge niile, ugwu mgbawa tinyere ezi egwu n'ime ndị mmadụ, ma e nwere ebe dum ebe a na-amanye ndị bi n'ógbè ahụ ka ha na ndị dike ndị a dị n'akụkụ. Site n'isiokwu a, ị ga-amụta ihe ọkụkụ kachasị ukwuu na America.
North America
N'akụkụ a nke ụwa bụ ugwu mgbawa, nke kachasị ukwuu na mbara ala , ma ọ bụghị naanị na North America. Ọ bụ banyere Yellowstone caldera - nnukwu ugwu mgbawa, nke dị na steeti Wyoming, na National Park. Ogologo ya dị 2805 mita. Ọ na-ekpuchi ebe dị square kilomita 3,960, nke bụ otu ụzọ n'ụzọ atọ nke ógbè National Park. Ebe a dị n'elu ebe dị ọkụ, ebe a na-edugharị nkume nke a wụrụ awụ nke uwe elu ahụ n'elu ala. Taa, ebe ugwu Yellowstone na-ekpuchi isi ihe a, ma ọtụtụ afọ gara aga, ọ bụ ya mere ka e guzobe n'akụkụ ebe ọwụwa anyanwụ nke ebe ugwu Snake mgbe ọtụtụ okpukpu abụọ nke ugwu mgbawa ahụ gasịrị.
Ndị ọkà mmụta sayensị achọpụtala ihe ndị fọdụrụ n'ugwu nke nnukwu ugwu mgbawa a na 1960, na-eduzi data sitere na satịlaịtị. O wee pụta na nchekwa ihe nchekwa na-ejidekwa nnukwu afụ nke incandescent magma n'ime ya. Ọnọdụ okpomọkụ dị n'ime ya dịgasị ogo ogo asatọ. Ọ bụ nke a si na mbara ala nke dị n'ime ala na-agbapụ, mmiri na-asọ oyi na-ekpo ọkụ, na-ahapụ carbon dioxide na igwe ojii nke hydrogen sulfide.
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Dị ka ndị ọkà mmụta sayensị si kwuo, ọkpụkpụ mbụ buru ibu nke Yellowstone caldera mere ihe karịrị nde afọ abụọ gara aga. Nke a mere ka mgbada nke ugwu dị iche iche, na-ekpuchi 25% nke ala nke North America nke oge a na akwa ash mgbawa. Mgbaji nke abụọ ahụ ruru 1.27 nde afọ tupu oge anyị, nke atọ mere 640,000 afọ gara aga. Mgbe ahụ, enwere nnukwu oghere gbara gburugburu na redio nke 150 kilomita, nke a na-akpọ caldera. Nke a mere n'ihi ụda nke oke ugwu mgbawa ahụ. Dị ka ndị ọkà mmụta sayensị si kwuo, ihe ịga nke ọma nke ugwu mgbawa dị ike nwere ike ime bụ 0.00014%. Ihe nwere ike ime bụ ihe efu, mana ọ dị.
South America
Na South America, nnukwu ugwu mgbawa bụ ugwu ugwu Cotopaxi, ugwu ya dị mita 5896. Ebe nke abụọ bụ ugwu ugwu Sangay (mita 5,410), nke atọ na Mexico Popocatepetel (5452 mita). Akwụkwọ bụ Guinness Book of Records na-ekwu na ugwu kachasị elu bụ Ochos del Salado, nke dị na ókèala Argentine-Chile, ma a na-ewere ya dị ka ihe na-adịghị. Na mkpokọta, na South America, e nwere 194 nnukwu nnukwu ọkụ ọkụ, ọtụtụ n'ime ha anaghị adị.
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