Violence reflects the vigour with which a pyroclastic flow is emplaced. It is described quantitatively by the height of hills climbed by the flow (yielding flow-velocity estimates), the overall morphology of the deposit and by the proportion
of the flow which forms an ignimbrite veneer deposit. Using the Taupo ignimbrite (New Zealand) as an example of an extremely violent flow, we relate violence to the eruption intensity. The AA. consider that eruption magnitude and intensity control the gross
Revue des études récentes sur les pyroclastiques rhyolitiques de la zone du Taupo. Détermination de la cheminée d'origine des dépôts, estimation de leur volume| distinction entre la magnitude, la puissance dispersive, l'intensité et la violence des