Table 1 Characteristics of the four major eruptive events (Aso-1, Aso-2, Aso-3 and Aso-4) (Aramaki 1984; Hunter 1998)
Unit | Volume (km3) | Eruptive age (ka) | Source and dominant geological units |
|---|---|---|---|
Aso-1 | >30 | 370-270 | Welded tuff |
Aso-2 | >25 | 170 | Welded tuff, in part non-welded deposit of scoria |
Aso-3 | >40 | 100 | Vitric ash, pumice or scoria and welded tuff |
Aso-4 | >80 | 80 | Non-welded deposit of vitric ash fall and pumice |