Investigating polygonal fault topological variability: Structural causes vs image resolution

© 2019 Elsevier Ltd The topology of three polygonal fault sets is investigated to determine potential causes of variations in connectivity (as measured by nodes and branches) between, and vertically within the fault sets. Two faults sets (from the Great South Basin (GSB), New Zealand, and Southeast...

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Main Authors: C. K. Morley, H. Binazirnejad
Format: Journal
Published: 2020
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http://cmuir.cmu.ac.th/jspui/handle/6653943832/68359
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-683592020-04-02T15:25:32Z Investigating polygonal fault topological variability: Structural causes vs image resolution C. K. Morley H. Binazirnejad Earth and Planetary Sciences © 2019 Elsevier Ltd The topology of three polygonal fault sets is investigated to determine potential causes of variations in connectivity (as measured by nodes and branches) between, and vertically within the fault sets. Two faults sets (from the Great South Basin (GSB), New Zealand, and Southeast Asia (SEA)) are imaged by 3D seismic reflection data, a third data set (Al Farafra Oasis, Egypt) is imaged from satellite data. The values measuring connectivity for the GSB and SEA polygonal fault sets plot in ternary diagrams in similar areas to other complex normal fault sets from rifts. These data sets are dominated by faults with either isolated fault tips (I nodes) or with abutting or splaying geometries (Y nodes). The similarities in node and branch topology of polygonal faults, and complex fault patterns in rifts (associated with multi-phase rifting, complex local stress rotations, or inherited fabrics), which are imaged on 3D seismic, indicates that topology describes the complexity of fault connectivity, but in general, by itself, cannot discriminate the causes of normal fault pattern variations. The Al Farafra Oasis faults sets (areas 2 and 3) provide an end member example of fault patterns with a very high degree of connectivity associated with cross-cutting fault sets (X-nodes) that are more rarely present in other fault sets. Some faults forming X-nodes may be hybrid tensile-shear failure fractures, or even calcite vein-filled tensile fractures. Much of the difference between the seismic and satellite image data sets may be related resolution, indicating that comparisons of topology characteristics are best made between data sets of similar resolution. 2020-04-02T15:25:32Z 2020-04-02T15:25:32Z 2020-01-01 Journal 01918141 2-s2.0-85074941502 10.1016/j.jsg.2019.103930 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85074941502&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/68359
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
topic Earth and Planetary Sciences
spellingShingle Earth and Planetary Sciences
C. K. Morley
H. Binazirnejad
Investigating polygonal fault topological variability: Structural causes vs image resolution
description © 2019 Elsevier Ltd The topology of three polygonal fault sets is investigated to determine potential causes of variations in connectivity (as measured by nodes and branches) between, and vertically within the fault sets. Two faults sets (from the Great South Basin (GSB), New Zealand, and Southeast Asia (SEA)) are imaged by 3D seismic reflection data, a third data set (Al Farafra Oasis, Egypt) is imaged from satellite data. The values measuring connectivity for the GSB and SEA polygonal fault sets plot in ternary diagrams in similar areas to other complex normal fault sets from rifts. These data sets are dominated by faults with either isolated fault tips (I nodes) or with abutting or splaying geometries (Y nodes). The similarities in node and branch topology of polygonal faults, and complex fault patterns in rifts (associated with multi-phase rifting, complex local stress rotations, or inherited fabrics), which are imaged on 3D seismic, indicates that topology describes the complexity of fault connectivity, but in general, by itself, cannot discriminate the causes of normal fault pattern variations. The Al Farafra Oasis faults sets (areas 2 and 3) provide an end member example of fault patterns with a very high degree of connectivity associated with cross-cutting fault sets (X-nodes) that are more rarely present in other fault sets. Some faults forming X-nodes may be hybrid tensile-shear failure fractures, or even calcite vein-filled tensile fractures. Much of the difference between the seismic and satellite image data sets may be related resolution, indicating that comparisons of topology characteristics are best made between data sets of similar resolution.
format Journal
author C. K. Morley
H. Binazirnejad
author_facet C. K. Morley
H. Binazirnejad
author_sort C. K. Morley
title Investigating polygonal fault topological variability: Structural causes vs image resolution
title_short Investigating polygonal fault topological variability: Structural causes vs image resolution
title_full Investigating polygonal fault topological variability: Structural causes vs image resolution
title_fullStr Investigating polygonal fault topological variability: Structural causes vs image resolution
title_full_unstemmed Investigating polygonal fault topological variability: Structural causes vs image resolution
title_sort investigating polygonal fault topological variability: structural causes vs image resolution
publishDate 2020
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85074941502&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/68359
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