EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regional-scale proximal to distal footwall scarp-degradation variability of extensional faults

Candela Martinez1, Domenico Chiarella1, Christopher A.-L Jackson2, and Nicola Scarselli1
Candela Martinez et al.
  • 1Department of Earth Science, Royal Holloway University of London, Egham, England
  • 2Department of Earth and Environmental Sciences, The University of Manchester, Manchester, England

Footwall fault scarp-degradation produces sediments resulting in gravity-driven syn-rift wedge-shaped deposits located on the immediate hangingwall. To understand which aspects control footwall scarp-degradation we propose a model suggesting where, why, and how degradation occurs. We compare five offshore 3D seismic surveys acquired on the Northern Carnarvon Basin (North West Shelf of Australia) calibrated with well data to assess these questions. Two 3D seismic surveys (i.e., Panaeus 2001 East and Fortuna) are located on the Dampier Sub-basin, proximal to the Western Australia coastline and three (i.e., Thebe, Bonaventure and Agrippina) in a more distal position on the Exmouth Plateau. Data show that degradation is more pronounced on the distal surveys compared to the proximal ones. On the proximal surveys, the sedimentation rate is greater than in the distal ones, and footwall scarp-degradation is less pronounced. Answering these questions will help us to predict the style and the amount of footwall scarp-degradation in similar extensional settings.

How to cite: Martinez, C., Chiarella, D., Jackson, C. A.-L., and Scarselli, N.: Regional-scale proximal to distal footwall scarp-degradation variability of extensional faults, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-8726,, 2022.