An eruption at Japan’s Kusatsu triggered an avalanche at a ski area on the volcano, injuring at least 25 with possibly more people missing. The eruption was unexpected, with so far no evidence of any warning signs from the volcano. News reports say that rocks littered the upper slopes of the volcano and the ski lodge was hit by volcanic debris as well. Additionally, the blast “triggered an avalanche”. Although the reports I’ve seen don’t say it explicitly, I think they mean a snow avalanche