The thinness of the first ash layer, along with the lack of noticeable erosion of that layer by winter rains before the next layer was deposited, indicate that the volcano gave the local population a few months' warning.
A delgadeza da primeira capa de cinzas, xunto coa notable falta de erosión desa capa polas choivas do inverno antes de que depositara a seguinte capa, indican que o volcán deu unha advertencia á poboación local poucos meses antes.