Plinian eruption
The vent radius and water content of magma indicate that the average volume discharge rate of the Plinian eruption and ignimbrite was 1–3 × 105 m3/s (1–3 × 108 kg/s). A total bulk ejecta of 120 km3 was derived from bulk volumes of pumice fall and ignimbrite of 83 km3 and 37.5 km3, respectively. The ignimbrite-forming eruption may have lasted one and a half to four days (35–104 hours), while the Plinian eruption may have lasted three to nine and a half days (77–230 hours). The total duration of the eruption may have been four and a half to fourteen days (111–333 hours).