Tokar dutse mai aman wuta wato 'volcanic eruption' wani ɓaɓɓake daga dutse, ma'adanai, da kuma volcanic gilashi, halitta a lokacin volcanic eruptions da kuma aunawa kasa da 2 mm (0,079 inci) a diamita. Hakanan ana amfani da kalmar tokar aman wuta sau da yawa don nufin duk samfuran fashewar abubuwa (wanda ake kira tephra ), gami da barbashi mafi girma fiye da 2 mm. An samar da tokar ƙanƙara yayin fashewar dutsen mai fashewa lokacin da iskar gas a cikin magma ta faɗaɗa kuma ta tsere cikin yanayi ta faɗaɗa kuma ta tsere cikin yanayi. Ƙarfin gas ɗin ya farfasa magma kuma ya tura shi cikin sararin samaniya inda ya kakkarye zuwa gutsuttsarin dutse da gilashi. Hakanan ana samar da toka lokacin da magma ta sadu da ruwa yayin fashewar phreatomagmatic, yana haifar da ruwan ya fashe da fashewa zuwa tururi wanda ke haifar da fashewar magma. Da zarar cikin iska, iskar tana ɗaukar iska zuwa dubban kilomita. Ana samar da toka mai aman wuta a lokacin fashewar dutsen mai fashewa, fashewar phreatomagmatic da lokacin jigilar abubuwa a cikin guguwa mai yawa.