Umuringa uva mumazi yubushyuhe, agizwe ahanini namazi, kandi arekurwa na magma ikonje.Izi magma, ari nazo shingiro ryo kuruka, ziva mu gice cyo hagati hagati y’imbere n’isi, ni ukuvuga mantant, hanyuma ikazamuka ku isi kugira ngo ikore icyumba cya magma.Ubujyakuzimu bw'iki cyumba buri hagati ya 5km na 15km.

Ishirwaho ryububiko bwumuringa rifata imyaka ibihumbi mirongo kugeza ku bihumbi magana, kandi kuruka kwikirunga ni kenshi.guturika byananiranye biterwa no guhuza ibipimo byinshi igipimo cyo guterwa magma, igipimo cyo gukonja hamwe nubukomere bwurusenda ruzengurutse icyumba cya magma.

Ivumburwa ryerekana isano iri hagati y’ibirunga binini n’ibirunga bizatuma bishoboka gukoresha ubumenyi bunini bwungutse n’abahanga mu birunga kugira ngo bateze imbere imyumvire y’iki gihe cyo gushinga imyanda ya porphyry.