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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 13, issue 4 | Copyright

Special issue: Marine and lake paleoseismology

Nat. Hazards Earth Syst. Sci., 13, 833-867, 2013
https://doi.org/10.5194/nhess-13-833-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 04 Apr 2013

Research article | 04 Apr 2013

Seismoturbidite record as preserved at core sites at the Cascadia and Sumatra–Andaman subduction zones

J. R. Patton1, C. Goldfinger1, A. E. Morey1, C. Romsos1, B. Black1, Y. Djadjadihardja2, and Udrekh2 J. R. Patton et al.
  • 1College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA
  • 2Bandan Penghajian Dan Penerapan Teknologi BPPT 2nd Building, 19th Floor, Jl.MH. Thamrin 8, Jakarta, 10340, Indonesia

Abstract. Turbidite deposition along slope and trench settings is evaluated for the Cascadia and Sumatra–Andaman subduction zones. Source proximity, basin effects, turbidity current flow path, temporal and spatial earthquake rupture, hydrodynamics, and topography all likely play roles in the deposition of the turbidites as evidenced by the vertical structure of the final deposits. Channel systems tend to promote low-frequency components of the content of the current over longer distances, while more proximal slope basins and base-of-slope apron fan settings result in a turbidite structure that is likely influenced by local physiography and other factors. Cascadia's margin is dominated by glacial cycle constructed pathways which promote turbidity current flows for large distances. Sumatra margin pathways do not inherit these antecedent sedimentary systems, so turbidity currents are more localized.

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