The dynamics of effusive events is controlled by the interplay between conduit geometry and source conditions. Dyke-like geometries have been traditionally assumed for describing conduits during effusive eruptions, but their depth-dependent and temporal modifications are largely unknown. We present a novel model which describes the evolution of conduit geometry during effusive eruptions by using a quasi steady state approach based on a 1-D conduit model and appropriate criteria for describing fluid shear stress and elastic deformation. This approach provides time-dependent trends for effusion rate, conduit geometry, exit velocity, and gas flow. Fluid shear stress leads to upward widening conduits, whereas elastic deformation becomes relevant only during final phases of effusive eruptions. Simulations can reproduce different trends of effusion rate, showing the effect of magma source conditions and country rock properties on the eruptive dynamics. This model can be potentially applied for data inversion in order to study specific case studies.
Evolution of Conduit Geometry and Eruptive Parameters During Effusive Events
PIstolesi M.;
2018-01-01
Abstract
The dynamics of effusive events is controlled by the interplay between conduit geometry and source conditions. Dyke-like geometries have been traditionally assumed for describing conduits during effusive eruptions, but their depth-dependent and temporal modifications are largely unknown. We present a novel model which describes the evolution of conduit geometry during effusive eruptions by using a quasi steady state approach based on a 1-D conduit model and appropriate criteria for describing fluid shear stress and elastic deformation. This approach provides time-dependent trends for effusion rate, conduit geometry, exit velocity, and gas flow. Fluid shear stress leads to upward widening conduits, whereas elastic deformation becomes relevant only during final phases of effusive eruptions. Simulations can reproduce different trends of effusion rate, showing the effect of magma source conditions and country rock properties on the eruptive dynamics. This model can be potentially applied for data inversion in order to study specific case studies.File | Dimensione | Formato | |
---|---|---|---|
Aravena Geophys. Res. Lett. 2018.pdf
Open Access dal 01/03/2019
Descrizione: Articolo principale
Tipologia:
Versione finale editoriale
Licenza:
Tutti i diritti riservati (All rights reserved)
Dimensione
729.8 kB
Formato
Adobe PDF
|
729.8 kB | Adobe PDF | Visualizza/Apri |
Aravena Geophys. Res. Lett. 2018.pdf
accesso aperto
Descrizione: Versione finale non editoriale
Tipologia:
Documento in Post-print
Licenza:
Tutti i diritti riservati (All rights reserved)
Dimensione
1.1 MB
Formato
Adobe PDF
|
1.1 MB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.