▁a ▁major ▁fl uct u ation ▁in ▁er u ption ▁column ▁height ▁during ▁this ▁Pl in ian ▁event . ▁Based ▁on ▁distribution ▁of ▁maximum ▁l ith ics ▁cl asts ▁in ▁the ▁early ▁er u ption , ▁the ▁er u ption ▁column ▁probably ▁reached ▁ 2 8   km ▁( H B = 2 0   km ), ▁and ▁mass ▁dis charge ▁rate ▁att ained ▁ 1 0 8 ▁kg / s ▁( 1 0 5 ▁m 3 / s ). ▁The ▁Early ▁period ▁may ▁have ▁released ▁ 1 . 8 8 – 5 . 6 3 ▁× ▁ 1 0 1 9 ▁jou le , ▁and ▁the ▁er u ption ▁might ▁have ▁last ed ▁for ▁ 3 3 . 5 – 1 1 5 . 5 ▁hours . ▁ ▁Cl im ax ▁period ▁ ▁Based ▁on ▁the ▁distribution ▁of ▁cross wind ▁of ▁maximum ▁l ith ics ▁cl asts , ▁the ▁top ▁of ▁er u ption ▁column ▁might ▁have ▁reached ▁ 3 6   km ▁( H B = 2 5   km ), ▁with ▁a ▁mass ▁dis charge ▁rate ▁of ▁around ▁ 3 . 6 ▁× ▁ 1 0 8 ▁kg / s ▁( 3 . 6 ▁× ▁ 1 0 5 ▁m 3 / s ). ▁The ▁distribution ▁of ▁down wind ▁of ▁maximum ▁l ith ics ▁cl asts ▁showed ▁the ▁wind ▁direction ▁at ▁the ▁time ▁to ▁be ▁SE 1 2 0 ° , ▁and ▁the ▁wind ▁speed ▁to ▁be ▁ 3 0   m / s . ▁The ▁height ▁of ▁er u