[O-05] Poster presentations by senior high school students

[O05-P63] Why is volcanic ash different at Mt.Usu

*Eri Tanaka¹ (1.Sapporo Kaisei Secondary School)

Keywords:Mt.Usu, volcanic ash

Mt.Usu is a 737m tall volcano in Hokkaido. Many people know Mt.Usu is a volcano, because Mt. Usu erupted in 2000. Researchers know the ash is different every eruption. Mt. Mitaka ash is red too. It was found that only the black ash contained iron. But I could not found iron oxide in the red ash.