Phys.org  October 12, 2021 Volcano eruption style is thought to be strongly controlled by fast conduit processes, limiting our ability for prediction. To understand if the eruptive behaviour is predetermined by the state of the magma in the subvolcanic reservoir an international team of researchers (Switzerland, USA – Brown University) analysed the pre-eruptive storage conditions of 245 units from volcanoes around the world. They showed that pre-eruptive crystallinity, dissolved water content and the presence of exsolved volatiles in the chamber exert a primary control on eruptive styles. Magmas erupt explosively over a well-defined range in dissolved water content (~4–5.5 wt%) and […]