Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1038/s41598-018-36505-x
Licence creative commons licence
Title (Primary) The brittle-ductile transition in active volcanoes
Author Parisio, F.; Vinciguerra, S.; Kolditz, O. ORCID logo ; Nagel, T.
Journal Scientific Reports
Year 2019
Department ENVINF
Volume 9
Page From art. 143
Language englisch
Abstract Contrasting deformation mechanisms precede volcanic eruptions and control precursory signals. Density increase and high uplifts consistent with magma intrusion and pressurization are in contrast with dilatant responses and reduced surface uplifts observed before eruptions. We investigate the impact that the rheology of rocks constituting the volcanic edifice has on the deformation mechanisms preceding eruptions. We propose a model for the pressure and temperature dependent brittle-ductile transition through which we build a strength profile of the shallow crust in two idealized volcanic settings (igneous and sedimentary basement). We have performed finite element analyses in coupled thermo-hydro-mechanical conditions to investigate the influence of static diking on the local brittle-ductile transition. Our results show that in active volcanoes: (i) dilatancy is an appropriate indicator for the brittle-ductile transition; (ii) the predicted depth of the brittle-ductile transition agrees with the observed attenuated seismicity; (iii) seismicity associated with diking is likely to be affected by ductile deformation mode caused by the local temperature increase; (iv) if failure occurs within the edifice, it is likely to be brittle-dilatant with strength and stiffness reduction that blocks stress transfers within the volcanic edifice, ultimately damping surface uplifts.
Persistent UFZ Identifier
Parisio, F., Vinciguerra, S., Kolditz, O., Nagel, T. (2019):
The brittle-ductile transition in active volcanoes
Sci. Rep. 9 , art. 143