Publications des scientifiques de l'IRD

Pinel Virginie. (2011). Influence of pre-existing volcanic edifice geometry on caldera formation. Geophysical Research Letters, 38, p. L11305. ISSN 0094-8276.

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Influence of pre-existing volcanic edifice geometry on caldera formation
Année de publication
Type de document
Article référencé dans le Web of Science WOS:000291813300007
Pinel Virginie
Geophysical Research Letters, 2011, 38, p. L11305 ISSN 0094-8276
Volcanic edifice construction at the Earth's surface significantly modifies the stress field within the underlying crust with two main implications for caldera formation. First, tensile rupture at the Earth's surface is favored at the periphery, which enables ring fault formation. Second, edifice formation amplifies the amount of pressure decrease occurring within a magma reservoir before the eruption stops. Taking into account both of these effects, caldera formation can be initiated during a central eruption of a preexisting volcano even when assuming elastic behaviour for the surrounding crust. Providing the roof aspect ratio is small enough, conditions for caldera formation by reservoir withdrawal can be reached whatever the reservoir shape is. However ring fault initiation is easier for laterally elongated reservoirs. Citation: Pinel, V. (2011), Influence of pre-existing volcanic edifice geometry on caldera formation, Geophys. Res. Lett., 38, L11305, doi: 10.1029/2011GL047900.
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Géophysique interne [066]
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