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The Geometry of the Continental Wedge and Its Relation to the Rheology and Seismicity of the Chilean Interplate Boundary

  • Andrei Maksymowicz
  • Andres Tassara
Chapter
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Part of the Springer Earth System Sciences book series (SPRINGEREARTH)

Abstract

A latitudinal tectonic segmentation along the Chilean subduction margin is defined by the modeling of the continental wedge geometry. The segments are characterized by different effective basal friction coefficients or Hubbert–Rubey fluid pressure ratio and are limited by the subduction of oceanic features and seaward continental prolongations. The analysis of the modeled parameters indicates that the process of tectonic erosion probably is associated with high levels of overpressure in the decóllement and inside the continental wedge. The observed segmentation shows a spatial correlation with the distribution of large earthquake ruptures, which suggest a link between the long-term and short-term deformation process. Joint interpretation of the results with the b-value analysis and the density-depth models in the 2010 Maule Mw8.8 earthquake zone shows the importance of these studies to understand the geodynamics of the subduction zones.

Keywords

Accretionary wedge Basal friction Fluid pressure Tectonic erosion Coulomb wedge model Large earthquake ruptures 
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Notes

Acknowledgements

Andrei Maksymowicz was supported by project FONDECYT 3150160 of the Chilean National Science Cooperation (CONICYT). Andres Tassara thanks project FONDECYT 1151175.

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Authors and Affiliations

  1. 1.Departamento de Geofísica, Facultad de Ciencias Físicas Y MatemáticasUniversidad de ChileSantiagoChile
  2. 2.Departamento de Ciencias de La Tierra, Universidad de ConcepciónCasillaChile

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