Contreras-Reyes, Eduardo, Völker, David, Bialas, Jörg , Moscoso, Eduardo and Grevemeyer, Ingo (2016) Reloca Slide: an ~24 km³ submarine mass wasting event in response to over-steepening and failure of the central Chilean continental slope. Terra Nova, 28 (4). pp. 257-264. DOI 10.1111/ter.12216.

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Abstract

Reloca Slide is the relict of an ~24 km³ submarine slope collapse at the base of the convergent continental margin of central Chile. Bathymetric and seismic data show that directly to the north and south of the slide the lower continental slope is steep (~10°), the deformation front is shifted landwards by 10–15 km, and the frontal accretionary prism is uplifted. In contrast, ~80 km to the north the lower continental margin presents a lower slope angle of about 4° and a wide frontal accretionary prism. We propose that high effective basal friction conditions at the base of the accretionary prism favored basal accretion of sediment and over-steepening of the continental slope, producing massive submarine mass wasting in the Reloca region. This area also spatially correlates with a zone of low coseismic slip of the 2010 Maule megathrust earthquake, which is consistent with high basal frictional coefficients.

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