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Dive into the research topics where Pauline Souloumiac is active.

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Featured researches published by Pauline Souloumiac.


Geology | 2016

Relationship link between landward vergence in accretionary prisms and tsunami generation

Nadaya Cubas; Pauline Souloumiac; Satish C. Singh

The very large slip up to the subduction front of the 2011 Tohoku-Oki (Japan) earthquake has challenged our classic view of the megathrust undergoing only aseismic slip at shallow depth. Furthermore, the enhancement of tsunamis during frontal rupturing has increased concern about tsunami risks. Recent seismic reflection images from the Sumatra subduction zone show frontal landward-vergent thrusts in the accretionary prism in the area of supposed shallow ruptures and enhanced tsunamis. Using mechanical analysis, we here show that sudden and successive decreases of the effective friction along the megathrust are required to form landward-vergent frontal thrusts. These decreases are most likely caused by dynamic weakening mechanisms, such as thermal pressurization of the pore fluids related to the propagation of earthquakes to the seafloor. Therefore, landward vergence in accretionary prisms is indicative of past seafloor frontal ruptures and consequent tsunamis. The presence of landward-verging structures in the Cascadia and Sumatra accretionary prisms might indicate future frontal rupture of the shallowest portion of the megathrust, resulting in large tsunamis.


Journal of Geophysical Research | 2018

Shear Versus Tensile Failure Mechanisms Induced by Sill Intrusions: Implications for Emplacement of Conical and Saucer‐Shaped Intrusions

Øystein Thordén Haug; Olivier Galland; Pauline Souloumiac; Alban Souche; Frank Guldstrand; Tobias Schmiedel; B. Maillot

Sills, saucer-shaped sills, and cone sheets are fundamental magma conduits in many sedimentary basins worldwide. Models of their emplacement usually approximate the host rock properties as purely elastic and consider the plastic deformation to be negligible. However, many field observations suggest that inelastic damage and shear fracturing play a significant role during sill emplacement. Here we use a rigid plasticity approach, through limit analysis modeling, to study the conditions required for inelastic deformation of sill overburdens. Our models produce distinct shear failure structures that resemble intrusive bodies, such as cone sheets and saucer-shaped sills. This suggests that shear damage greatly controls the transition from flat sill to inclined sheets. We derive an empirical scaling law of the critical overpressure required for shear failure of the sill’s overburden. This scaling law allows to predict the critical sill diameter at which shear failure of the overburden occurs, which matches the diameters of natural saucer-shaped intrusions’ inner sills. A quantitative comparison between our shear failure model and the established sill’s tensile propagation mechanism suggests that sills initially propagate as tensile fractures, until reaching a critical diameter at which shear failure of the overburden controls the subsequent emplacement of the magma. This comparison also allows us to predict, for the first time, the conditions of emplacement of both conical intrusions, saucer-shaped intrusions, and large concordant sills. Beyond the application to sills, our study suggests that shear failure significantly controls the emplacement of igneous sheet intrusions in the Earth’s brittle crust.


Earth and Planetary Science Letters | 2013

Megathrust friction determined from mechanical analysis of the forearc in the Maule earthquake area

Nadaya Cubas; Jean-Philippe Avouac; Pauline Souloumiac; Yves M. Leroy


Journal of Structural Geology | 2012

Bias due to side wall friction in sand box experiments

Pauline Souloumiac; Bertrand Maillot; Yves M. Leroy


Computational Geosciences | 2010

Failure in accretionary wedges with the maximum strength theorem: numerical algorithm and 2D validation

Pauline Souloumiac; K. Krabbenhoft; Yves M. Leroy; Bertrand Maillot


Journal of Geophysical Research | 2009

Predicting stress distributions in fold-and-thrust belts and accretionary wedges by optimization

Pauline Souloumiac; Yves M. Leroy; Bertrand Maillot; K. Krabbenhoft


Earth and Planetary Science Letters | 2015

The work of fault growth in laboratory sandbox experiments

Justin W. Herbert; Michele L. Cooke; Pauline Souloumiac; Elizabeth H. Madden; Baptiste Mary; Bertrand Maillot


Journal of Structural Geology | 2016

Benchmarking numerical models of brittle thrust wedges

Susanne J. H. Buiter; Guido Schreurs; Markus Albertz; Taras V. Gerya; Boris J. P. Kaus; Walter Landry; Laetitia Le Pourhiet; Yury Mishin; David L. Egholm; Michele L. Cooke; Bertrand Maillot; Cedric Thieulot; Tony Crook; Dave A. May; Pauline Souloumiac; Christopher Beaumont


Journal of Structural Geology | 2015

Mechanical validation of balanced cross-sections: The case of the Mont Terri anticline at the Jura front (NW Switzerland)

Typhaine Caër; Bertrand Maillot; Pauline Souloumiac; Pascale Leturmy; Dominique Frizon de Lamotte; Christophe Nussbaum


Geology | 2017

Inelastic damage as a mechanical precursor for the emplacement of saucer-shaped intrusions

Øystein Thordén Haug; Olivier Galland; Pauline Souloumiac; Alban Souche; Frank Guldstrand; Tobias Schmiedel

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Bertrand Maillot

Centre national de la recherche scientifique

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Yves M. Leroy

École Normale Supérieure

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Michele L. Cooke

University of Massachusetts Amherst

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Nadaya Cubas

California Institute of Technology

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Jean-Philippe Avouac

California Institute of Technology

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Jessica McBeck

University of Massachusetts Amherst

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Justin W. Herbert

University of Massachusetts Amherst

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Pascale Leturmy

Centre national de la recherche scientifique

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