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3D Geometry of normal faults in a rheologically layered system : Analogue modelling and seismic examples

Abstract : Geometry of normal faults, within the sedimentary cover, may be influenced by different parameters such as the presence, position and efficiency of décollement levels, the amount, direction and velocity of extension, and the rate of synkinematic sedimentation. These parameters have already been studied at different scales in field approach, analogue and numerical modelling. The effect of several décollement levels has been studied at lithospheric scale to better understand the deformation processes between surface and depth. At the scale of single structure in a sedimentary basin, previous analogue modelling only studied the effect of a determined geometry of a fault on the synkinematic sedimentation. Here we used analogue modelling to analyse the 3D geometry of a single structure in a domain with three prekinematic décollement levels, analogue of salt, shale or under-compacted level. These experiments result in flat and ramp geometry in relation with décollement level and the pattern of the deformation depends here mainly on the velocity and amount of extension. The results of the experiments were compared to seismic examples in order to better interpret typical fault setups. One of the key points is that the geometry of normal faults displays large variations both in direction and dip, only in pure extensive regime, related to the presence of décollement levels, and not associated with any global/regional variation of extension direction.
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https://hal-insu.archives-ouvertes.fr/insu-01080792
Contributor : Isabelle Dubigeon <>
Submitted on : Thursday, November 6, 2014 - 11:34:26 AM
Last modification on : Friday, April 5, 2019 - 8:17:35 PM

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  • HAL Id : insu-01080792, version 1

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Lina Vasquez, Thierry Nalpas, Jean-François Ballard, Olivier Dauteuil, Brendan Simon, et al.. 3D Geometry of normal faults in a rheologically layered system : Analogue modelling and seismic examples. 24 ème Réunion des sciences de la Terre 2014, Oct 2014, Pau, France. pp.215. ⟨insu-01080792⟩

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