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Displacement field in contraction-driven faults

Shin, Hosung, Santamarina, J. Carlos and Cartwright, Joseph Albert 2010. Displacement field in contraction-driven faults. Journal of Geophysical Research: Solid Earth 115 (B7) , B07408. 10.1029/2009JB006572

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Abstract

We investigate the distribution of strain and deformation in the host sediment that arises once a contraction-driven shear fault has localized and propagated under a zero-lateral strain condition. Numerical modeling of displacement distributions compares well with those measured using 3D seismic data. The parameters that determine the displacement field for a single normal fault embedded in sediments are fault height, overburden effective stress, stiffness, and residual friction angle (or post-peak strength). Proximity to the free boundary biases the displacement pattern, which becomes asymmetric. Although the measured displacements and numerical predictions are similar, the measured magnitude requires pronounced low stiffness of the sediment as well as low post peak shear strength. This requirement suggests that sediments hosting contraction-driven shear faults most likely have high porosity and high clay fraction and have undergone diagenetic reactions involving significant mineral dissolution. The diagenetic evolution of the sediment and its current composition may explain the global scaling relationship between the measured displacement and fault height for polygonal fault systems.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Q Science > QE Geology
Uncontrolled Keywords: polygonal fault systems; displacement; mineral dissolution
Additional Information: Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/2169-9356/ (accessed 20/02/2014).
Publisher: American Geophysical Union
ISSN: 2169-9356
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 4 March 2010
Last Modified: 23 May 2023 21:10
URI: https://orca.cardiff.ac.uk/id/eprint/12372

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