“…Generally, the switch from effusive to explosive activity during lava dome eruptions have been characterized by variations in magma discharge rate (Sparks, 1997) and volcano-seismic activity associated with magmatic or fluid movement (e.g., Neuberg, 2000;Arámbula-Mendoza et al, 2011). Pressurization, due to gas fluxing (e.g., Johnson et al, 1998;Michaut et al, 2013) or fresh magma recharge (e.g., Reyes-Dávila et al, 2016), may trigger explosive activity and evolution in associated monitored signals (Sparks, 1997). It is commonly believed that the competition between gas pressure and the rheology of dome lavas controls the development of fractures (Lavallée et al, 2008;Scheu et al, 2008;Heap et al, 2015a), porosity (Heap et al, 2015b;Rhodes et al, 2018) and coherence (e.g., Tuffisites; Kendrick et al, 2016), and thus permeability (Scheu et al, 2008;Lavallée et al, 2013;Gaunt et al, 2014;Farquharson et al, 2015), leading to either fragmentation and explosive activity (e.g., Dingwell, 1996;Papale, 1999) or outgassing and effusive activity (e.g., Edmonds et al, 2003;Gonnermann and Manga, 2007).…”