The eruptive output volume totaled , dwarfed by the 1980 eruption of Mount St. Helens, which had a volume of . The region on the volcano's northeastern flank destroyed by the eruptions, in area, is now known as the Devastated Area, and it along with other deposits from the volcano has been altered by erosion and regrowth of vegetation, though the vegetation in Devastated Area is sparse due to its siliceous (rich in silica), nutrient-deprived soil, which cannot sustain normal tree growth due to its lack of water retention. Due to their small size and thin deposits, the 1915 eruptions will likely not be well-preserved geologically.