Fitowar dutsen mai fitad da wuta na Tseax Cone a cikin 1775 ya kasance daga cikin munanan bala'o'i na Kanada, inda ya kashe kimanin mutane 2,000 na Nisga'a kuma ya lalata ƙauyensu a kwarin Nass River na arewacin British Columbia. Fitowar ta haifar da kwararar lava mai nisan kilomita 22.5, kuma, a cewar almara ta Nisga'a, ta toshe kwararar Nass. Matsakaicin matsakaici da yanayin zafi na bazara sun bambanta daga yanki zuwa yanki a Kanada.
1775 da kuma