Prior to collapse , the Mazama edifice had an estimated volume of , though it may have exceeded taking glacial erosion into account . After the climactic eruption , Mazama 's peak was completely destroyed , replaced by a depression with a depth of surrounded by cliffs . The volume of magma ejected from Mazama more or less equals the volume from the peak that collapsed , which scientists have estimated at between of lava . The lava produced was zoned vertically according to arrangement within the source magma chamber , and was calc-alkaline in composition . It consisted of roughly 90 percent uniform rhyodacitic pumice , which contained about 10 percent phenocrysts , the rest made up of crystalline andesite scoria and mafic crystals . The eruption released aerosol that lowered temperatures globally in the Northern Hemisphere , with estimates of for one to three years after the eruption . The temperature changes were possibly greater than the effects of the 1815 eruption of Mount Tambora . Mazama 's climactic eruption produced stratospheric mass loadings of of sulfuric acid , with an estimated minimum sulfate degassing of during its eruption . Aerosol from the eruption traveled as far as Greenland , falling for as long as six years
1815 eruption of Mount Tambora
1815 eruption of Mount Tambora
Mount Mazama