Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 384, Issue -, Pages 100-108Publisher
ELSEVIER
DOI: 10.1016/j.epsl.2013.09.040
Keywords
finite element model; magma reservoir; overpressure; ground deformation; Santorini; viscoelastic rheology
Categories
Funding
- National Science Foundation [EAR 0815101, EAR 0838536, EAR 0908324]
- National Science Foundation, a CEOAS Institutional Postdoc
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In this study, we utilize thermomechanical models to investigate how magma chambers overpressurize as the result of either magmatic recharge or volatile exsolution. By implementing an adaptive reservoir boundary condition we are able to track how overpressure dissipates as the magma chamber expands to accommodate internal volume changes. We find that the size of the reservoir greatly impacts the resultant magma chamber overpressure. In particular, overpressure estimates for small to moderate-sized reservoirs (1-10 km(3)) are up to 70% lower than previous analytical predictions. We apply our models to Santorini volcano in Greece where recent seismic activity and ground deformation observations suggested the potential for eruption. The incorporation of an adaptive boundary condition reproduces Mogi flux estimates and suggests that the magma reservoir present at Santorini may be quite large. Furthermore, model results suggest that if the magma chamber is >100 km(3), overpressures generated due to the high magma flux may not exceed the strength of the host rock, thus requiring an additional triggering mechanism for eruption. Although the adaptive boundary condition approach does not calculate the internal evolution of the magma reservoir, it represents a fundamental step forward from elastic Mogi models and fixed boundary solutions on which future investigations of the evolution of the magma can be built. (C) 2013 Elsevier B.V. All rights reserved.
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