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Effects of volcanic loading on regional compressive structures: new insights from natural examples and analogue modelling

Abstract : Nous présentons ici des exemples naturels d'édifices volcaniques coniques reposant sur un substratum fragile, soumis à une compression régionale ainsi que des résultats expérimentaux. Nous montrons que la charge de l'édifice induit une perturbation de la déformation régionale se traduisant par une déflexion et une horizontalisation des structures compressives régionales. Le contrôle tectonique est de nature topographique. Nous discutons ensuite certaines conséquences, en particulier concernant l'étalement gravitaire des volcans. We present natural examples and experimental models of volcanic cones located above brittle substratum undergoing regional compressive deformation. The volcanic loading induces a strain partitioning involving deflection and flattening of regional compressive structures. The main control is the topographic load. Anticlinal thrust ridges, observed around many volcanoes, have generally been interpreted as being due to gravitational spreading; however, this study shows that this is not necessarily the case, as they can also be a symptom of regional compression.
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Submitted on : Monday, August 28, 2006 - 8:31:56 AM
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yannick Branquet, Benjamin van Wyk de Vries. Effects of volcanic loading on regional compressive structures: new insights from natural examples and analogue modelling. Comptes rendus de l’Académie des sciences. Série IIa, Sciences de la terre et des planètes, Elsevier, 2001, 333, pp.455-461. ⟨10.1016/S1251-8050(01)01660-3⟩. ⟨hal-00089711⟩

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