B. Pascal

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Bouin Marie-Paule

Sacks I. Selwyn

S. Daniel Andrade

Instituto Geofísico de la Escuela Politécnica Nacional

Benjamín van Wyk de Vries

Laboratoire Magmas et Volcans

Levander Alan

Claude Robin

Clermont Université

B. Frederick

Cooperative Institutions

Université Clermont Auvergne

Instituto Geofísico de la Escuela Politécnica Nacional

Laboratoire Magmas et Volcans

Clermont Université

Institut de Recherche pour le Développement

Centre National de la Recherche Scientifique

Centro Universitário Maurício de Nassau

Fundación Universitaria Católica Lumen Gentium

National Polytechnic School

Universidad Católica de Cuenca

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Sub-volcanic slope influencing the development of major structures at volcanoes during strike-slip faulting

EGUGA (2014)

S. Daniel Andrade Benjamín van Wyk de Vries Claude Robin B. Pascal

The scaled experiments presented here show that the dip-angle and dip-direction of the subvolcanic slopes can systematically and significantly change the deformation patterns developed by the volcanic edifice during strikeslip faulting. When the dip-direction of the sub-volcanic slope and the strike of the fault are nearly parallel, an increased development and concentration of the deformation on the down-slope side of the volcanic cone occurs. In medium to long-term, this would imply again a tendency of major volcanic structures growing in a sub-parallel trend with respect to the strike of the fault, but with one preferred direction: that of the dip-direction. In the experiments, the dip-direction of the sub-volcanic slope was set progressively oblique, up to perpendicular, with respect to the strike of the fault by: 1) rotating in the same sense as the strike-slip fault, or 2) rotating in the opposite sense as the fault. In both cases, the downslope side of the volcanic cone still concentrates the deformation, but the deformed sectors progressively rotate which results in a structural development (construction and destruction) of the edifice occurring clearly oblique with respect to the strike of the fault. Imbabura volcano (Ecuador) is traversed by the strike-slip El Angel-Rio Ambi fault, whose sense of movement (left- or right-lateral) has not been clearly established yet. Aditionally, Imbabura has been constructed on the NW, medium to lower flank of the neighbor Cubilche volcano. The application of the experimental results presented above to the case of Imbabura volcano helps to understand the particular structure of this volcano which displays a complex history of construction and destruction events. Additionally, the experiments strongly suggests that the El Angel-Rio Ambi fault is left-lateral.

Volcanic cone

Magnetic dip

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Elastic Versus Non-Elastic Co-Seismic Strain Response at the Trizonia Borehole Sacks Evertson Dilatometer in the Rift of Corinth, Greece, for a Local, Moderate Earthquake.

AGUFM (2004)

B. Frederick B. Pascal Bouin Marie-Paule Sacks I. Selwyn Levander Alan

Dilatometer

Strain (injury)

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