DOI: http://dx.doi.org/10.5027/andgeoV44n1-a05

Depth-dependent geometry of margin-parallel strike-slip faults within oblique subduction zones

Nicole Stephanie Catalán Ormeño, Klaus Bataille, Andrés Tassara, Rodolfo Araya

Abstract


Based on the principle that faults develop where shear stress is maximum, we determine the depth-dependent geometry of margin-parallel strike-slip faults within oblique subduction zones. Using an elastic half-space model for the south Chile subduction zone, we show that the geometry of a margin-parallel strike-slip fault as the Liquiñe-Ofqui Fault Zone (LOFZ), is vertical near the free surface and curved downwards, until reaching the subducting slab. This geometry is compatible with the observations of reflectors on seismic data obtained from wide angle refraction studies in southern Chile. GPS measurements also support this curved geometry. We suggest that this curved pattern should occur on all margin-parallel strike-slip faults within oblique subduction zones worldwide.

Keywords


Oblique subduction; Margin-parallel strike-slip faults; Southern Andes; Liquiñe-Ofqui Fault Zone

How to cite this article Catalán Ormeño, N., Bataille, K., Tassara, A., and Araya, R., 2017, Depth-dependent geometry of margin-parallel strike-slip faults within oblique subduction zones: Andean Geology, v. 44, no. 1, p. 79-86., doi:http://dx.doi.org/10.5027/andgeoV44n1-a05