@article{fdi:010053603,
  title = {{C}onditions for detection of ground deformation induced by conduit flow and evolution},
  author = {{A}lbino, {F}. and {P}inel, {V}irginie and {M}assol, {H}. and {C}ollombet, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}t mature andesitic volcanoes, magma can reach the surface through the same path for several eruptions thus forming a volcanic conduit. {B}ecause of degassing, cooling, and crystallization, magma viscosity increase in the upper part of the conduit may induce the formation of a viscous plug. {W}e conducted numerical simulations to quantify the deformation field caused by this plug emplacement and evolution. {S}tress continuity between {N}ewtonian magma flow and elastic crust is considered. {P}lug emplacement causes a ground inflation correlated to a decrease of the magma discharge rate. {A} parametric study shows that surface displacements depend on three dimensionless numbers: the conduit aspect ratio (radius/length), the length ratio between the plug and the conduit, and the viscosity contrast between the plug and the magma column. {L}arger displacements are obtained for high-viscosity plugs emplaced in large aspect ratio conduits. {W}e find that only tiltmeters or {GPS} located close to the vent (a few hundred meters) might record the plug emplacement. {A}t immediate proximity of the vent, plug emplacement might even dominate the deformation signal over dome growth or magma reservoir pressurization effects. {F}or given plug thicknesses and viscosity profiles, our model explains well the amplitude of tilt variations (from 1 to 25 mu rad) measured at {M}ontserrat and {M}t. {S}t. {H}elens. {W}e also demonstrate that at {M}ontserrat, even if most of the tilt signal is due to shear stress induced by magma flow, pressurization beneath the plug accounts for 20% of the signal.},
  keywords = {},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch - {S}olid {E}arth},
  volume = {116},
  numero = {},
  pages = {{B}06201},
  ISSN = {0148-0227},
  year = {2011},
  DOI = {10.1029/2010jb007871},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053603},
}