The unsteady end to a powerful Plinian eruption: insights from a Vulcanian block apron from the 1912 eruption of Novarupta, Alaska

Samantha J Isgett, University of Hawaii at Manoa, Honolulu, HI, United States, Bruce F Houghton, University of Hawaiʻi at Mānoa, Department of Earth and Planetary Sciences, Honolulu, United States, Alain Burgisser, Institut de Sciences de la Terre, Université Savoie Mont Blanc, Le Bourget du Lac, France and Laurent Arbaret, Université d'Orléans, OSUC / ISTO, Orléans Cedex 2, France