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Geological Society, London, Special Publications; 1991; v. 56; p. 231-239;
DOI: 10.1144/GSL.SP.1991.056.01.16
© 1991 Geological Society of London

Analogue-Modelling and Section-Balancing

Physical and seismic modelling of listric normal fault geometries

K. R. McClay, D. A. Waltham, A. D. Scott & A. Abousetta

Department of Geology, Royal Holloway and Bedford New College, University of London, Egham, Surrey TW20 0EX, UK

Scaled analogue models of listric fault systems display a characteristic rollover anticline and crestal collapse graben features. Faults nucleate in sequence into the hangingwalls of the crestal collapse graben and towards the footwall of the master fault. Superposition of crestal collapse grabens produces complex fault arrays. When the basal detachment surface is tilted a characteristic panel of unfaulted synfault stratigraphy forms adjacent to the detachment. These experiments produce structures with close similarities to listric growth fault systems on prograding delta slopes. Synthetic seismic sections of the experimental models have been produced using Kirchhoff integral techniques. These illustrate the complexities in trying to image complex structures in listric fault systems but also show good agreement with natural seismic examples.





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