Reloca Slide: an similar to 24km(3) submarine mass-wasting event in response to over-steepening and failure of the central Chilean continental slope
Author
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Contreras Reyes, Eduardo
Author
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Völker, David
Author
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Bialas, Jörg
Author
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Moscoso, Eduardo
Author
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Grevemeyer, Ingo
Admission date
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2016-12-19T15:35:07Z
Available date
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2016-12-19T15:35:07Z
Publication date
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2016
Cita de ítem
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Terra Nova Volumen: 28 Número: 4 Páginas: 257-264 Aug 2016
es_ES
Identifier
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10.1111/ter.12216
Identifier
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https://repositorio.uchile.cl/handle/2250/141960
Abstract
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Reloca Slide is the relict of an similar to 24-km(3) 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 (similar to 10 degrees), the deformation front is shifted landwards by 10-15km, and the frontal accretionary prism is uplifted. In contrast, similar to 80km to the north the lower continental margin presents a lower slope angle of about 4 degrees and a wide frontal accretionary prism. We propose that high effective basal friction conditions at the base of the accretionary prism favoured 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.
es_ES
Patrocinador
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Chilean National Science Foundation FONDECYT
1130004
German Research Foundation
Sonderforschungsbereich 574