@article{fdi:010065415,
  title = {{H}ow caldera collapse shapes the shallow emplacement and transfer of magma in active volcanoes},
  author = {{C}orbi, {F}. and {R}ivalta, {E}. and {P}inel, {V}irginie and {M}accaferri, {F}. and {B}agnardi, {M}. and {A}cocella, {V}.},
  editor = {},
  language = {{ENG}},
  abstract = {{C}alderas are topographic depressions formed by the collapse of a partly drained magma reservoir. {A}t volcanic edifices with calderas, eruptive fissures can circumscribe the outer caldera rim, be oriented radially and/or align with the regional tectonic stress field. {C}onstraining the mechanisms that govern this spatial arrangement is fundamental to understand the dynamics of shallow magma storage and transport and evaluate volcanic hazard. {H}ere we show with numerical models that the previously unappreciated unloading effect of caldera formation may contribute significantly to the stress budget of a volcano. {W}e first test this hypothesis against the ideal case of {F}ernandina, {G}alapagos, where previous models only partly explained the peculiar pattern of circumferential and radial eruptive fissures and the geometry of the intrusions determined by inverting the deformation data. {W}e show that by taking into account the decompression due to the caldera formation, the modeled edifice stress field is consistent with all the observations. {W}e then develop a general model for the stress state at volcanic edifices with calderas based on the competition of caldera decompression, magma buoyancy forces and tectonic stresses. {T}hese factors control: 1) the shallow accumulation of magma in stacked sills, consistently with observations; 2) the conditions for the development of circumferential and/or radial eruptive fissures, as observed on active volcanoes. {T}his top-down control exerted by changes in the distribution of mass at the surface allows better understanding of how shallow magma is transferred at active calderas, contributing to forecasting the location and type of opening fissures.},
  keywords = {caldera collapse ; decompression ; dike propagation ; {F}inite {E}lement model ; {F}ernandina ; {COLON} {ARCHIPIELAGO} ; {FERNANDINA} {VOLCAN}},
  booktitle = {},
  journal = {{E}arth and {P}lanetary {S}cience {L}etters},
  volume = {431},
  numero = {},
  pages = {287--293},
  ISSN = {0012-821{X}},
  year = {2015},
  DOI = {10.1016/j.epsl.2015.09.028},
  URL = {https://www.documentation.ird.fr/hor/fdi:010065415},
}