Chen Chin-Wu, Huang Hsin-Fu, Hautmann Stefanie, Sacks I. Selwyn, Linde Alan T., Taira Taka'aki (2017), Resonance oscillations of the Soufrière Hills Volcano (Montserrat,W.I.) magmatic system induced by forcedmagma flow from the reservoir into the upper plumbing dike, in Journal of Volcanology and Geothermal Research
, 350, 7-17.
Hautmann Stefanie, Sacks I. Selwyn, Linde Alan T., Roberts Matthew J. (2017), Magma buoyancy and volatile ascent driving autocyclic eruptivity at Hekla Volcano (Iceland), in Geochemistry, Geophysics, Geosystems
, 18, 1-13.
Hautmann Stefanie, Gottsmann Joachim, Ground deformation and gravity changes of the Kos-Nisyros volcanic system between 1995 and 2008, in Dietrich Volker (ed.).
Subsurface magmatic processes lead to quantifiable geophysical signals that are recorded at the surface to assess a volcano's activity state. However, magmatically-induced stress changes in the upper crust can trigger groundwater flow in the vicinity of active volcanoes that can bias geophysical signals recorded at the surface. To date, the relationship between hydrological and volcanic activity is widely unexplored and to what extent perturbations in the hydrological system (e.g., changes in groundwater level) impact geophysical monitoring data from active volcanoes remains a key unanswered question. The proposed project aims to investigate and quantify groundwater dynamics and their associated geophysical signals in response to changes in an active magmatic system.By means of theoretical computational simulations, forced groundwater transport away from and towards a pressure source will be explored, in order to establish a conceptual and quantifiable theoretical model on subsurface fluid flow in response to magmatic stress changes and their controlling parameters. Computational models will be run accounting for both porous and fractured flow mediums. Multi-parametric field data from three active volcanic settings [Soufrière Hills Volcano (Montserrat, W.I.), Mayon (Philippines) and Nisyros (Greece)] will then be applied to the hydrogeophysical models in order to benchmark predicted model results and to interpret and quantify recorded data for hydrologic/magmatic source mechanisms. The research will combine for the first time geophysical with hydrological (groundwater level, well discharge) data and volcanic (magma extrusion, volcanic explosions) observations.The results will enable (i) the interpretation and quantification of the geophysical records from three volcanic settings, (ii) the discrimination of hydrological vs. magmatic processes in the recorded signals, and (iii) the development of conceptual physical models of volcanic-hydrological interactions to ultimately understand how changes in one system impact the other. Outcomes will help improve the interpretation of volcanic monitoring data in terms of eruption forecasting and contribute to helping ensure availability and security of the water supply in volcanic regions.