Displacement field in contraction-driven faults
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 dat...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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Blackwell Publishing Ltd
2010
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| _version_ | 1797075326801543168 |
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| author | Shin, H Santamarina, J Cartwright, J |
| author_facet | Shin, H Santamarina, J Cartwright, J |
| author_sort | Shin, H |
| collection | OXFORD |
| description | 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.Copyright 2010 by the American Geophysical Union. |
| first_indexed | 2024-03-06T23:48:53Z |
| format | Journal article |
| id | oxford-uuid:71e9fa21-bea8-4a3a-b5d5-5f425369e06b |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T23:48:53Z |
| publishDate | 2010 |
| publisher | Blackwell Publishing Ltd |
| record_format | dspace |
| spelling | oxford-uuid:71e9fa21-bea8-4a3a-b5d5-5f425369e06b2022-03-26T19:46:45ZDisplacement field in contraction-driven faultsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:71e9fa21-bea8-4a3a-b5d5-5f425369e06bEnglishSymplectic Elements at OxfordBlackwell Publishing Ltd2010Shin, HSantamarina, JCartwright, JWe 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.Copyright 2010 by the American Geophysical Union. |
| spellingShingle | Shin, H Santamarina, J Cartwright, J Displacement field in contraction-driven faults |
| title | Displacement field in contraction-driven faults |
| title_full | Displacement field in contraction-driven faults |
| title_fullStr | Displacement field in contraction-driven faults |
| title_full_unstemmed | Displacement field in contraction-driven faults |
| title_short | Displacement field in contraction-driven faults |
| title_sort | displacement field in contraction driven faults |
| work_keys_str_mv | AT shinh displacementfieldincontractiondrivenfaults AT santamarinaj displacementfieldincontractiondrivenfaults AT cartwrightj displacementfieldincontractiondrivenfaults |