Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

Publications des scientifiques de l'IRD

Pinel Virginie, Carrara A., Maccaferri F., Rivalta E., Corbi F. (2017). A two-step model for dynamical dike propagation in two dimensions : application to the July 2001 Etna eruption. Journal of Geophysical Research : Solid Earth, 122 (2), 1107-1125. ISSN 2169-9313

Accès réservé (Intranet IRD) Document en accès réservé (Intranet IRD)

Lien direct chez l'éditeur doi:10.1002/2016jb013630

Titre
A two-step model for dynamical dike propagation in two dimensions : application to the July 2001 Etna eruption
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000396132200019
AuteursPinel Virginie, Carrara A., Maccaferri F., Rivalta E., Corbi F.
SourceJournal of Geophysical Research : Solid Earth, 2017, 122 (2), p. 1107-1125. ISSN 2169-9313
RésuméWe developed a hybrid numerical model of dike propagation in two dimensions solving both for the magma trajectory and velocity as a function of the source overpressure, the magma physical properties (density and viscosity), and the crustal density and stress field. This model is used to characterize the influence of surface load changes on magma migration toward the surface. We confirm that surface loading induced by volcanic edifice construction tends both to attract the magma and to reduce its velocity. In contrast, surface unloading, for instance, due to caldera formation, tends to divert the magma to the periphery-retarding eruption. In both cases the deflected magma may remain trapped at depth. Amplitudes of dike deflection and magma velocity variation depend on the ratio between the magma driving pressure (source overpressure as well as buoyancy) and the stress field perturbation. Our model is then applied to the July 2001 eruption of Etna, where the final dike deflection had been previously interpreted as due to the topographic load. We show that the velocity decrease observed during the last stage of the propagation can also be attributed to the local stress field. We use the dike propagation duration to estimate the magma overpressure at the dike bottom to be less than 4 MPa. This approach can be potentially used to forecast if, where, and when propagating magma might reach the surface when having knowledge on the local stress field, magma physical properties, and reservoir overpressure.
Plan de classementGéophysique interne [066] ; Géologie et formations superficielles [064]
Descr. géo.ITALIE ; ETNA
LocalisationFonds IRD [F B010069296]
Identifiant IRDfdi:010069296
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010069296

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


Accès aux documents originaux :

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Nouméa

Papeete

Niamey

Ouagadougou

Tunis

La Paz

Quito