USING POST ERUPTIVE UPLIFT TO UNDERSTAND PLUMBING SYSTEMS UNDER VOLCANOES

Observing post eruptive uplift can aid in understanding the plumbing systems of active volcanoes. Post eruptive uplift is the inflation of the ground surface surrounding a volcano after an eruption. Observed using techniques such as InSAR and GPS, itis believed to be caused by the movement of magma towards the surface after an eruption. This work builds on previous observations and modeling of post eruptive uplift at Cordón Caulle, Chile, where the authors determined physical characteristics of the magma mush underlying the volcano. Expanding this work to other volcanoes that exhibit post eruptive uplift will provide insights on the internal structure of those volcanoes and reveal characteristics of theorized magma mushes that may reside below. We suggest the volcanic system undergoes the following process where after an eruption, a pressure drop within the system occurs, causing melt to leak from the mush, leading to the observed uplift. Using uplift data from a suite of volcanoes and assuming these volcanoes contain a mush within the plumbing system, we employ similar methods used for Cordón Caulle to model the melt flow from the mush and the corresponding changes within the mush. These models allow us to hypothesize characteristics of the theorized mushes such as the size and melt storage abilities.