(1) At the Chile triple junction area (Bourgois et al., 2000), the climate-induced variation of the sediment supply to the trench axis is the main factor controlling the continental margin tectonic regime. During the warm period of the interglacial episode at 117-130,000 years, rapid increase of the trench sediment accumulation caused the margin to switch from subduction-erosion or nonaccretion to subduction-accretion.
(2) Along the northwestern Peru forearc area (Bourgois et al., 2007), we infer that eustacy exerts important feedback coupling to seismic behavior of the Northern Peru subduction zone. We speculate that during sea level fall, pore-fluid pressure diminishes along the subduction channel inducing a possible seaward migration of the locked zone reaching a maximum by the end of the eustatic low stand at 19-23,000 years.
(3) At the Chile triple junction area (Bourgois et al., in progress), the major retreat of the northern Patagonia ice cap at 11-14,000 years controls the tectonic rebound of this segment of the Andes, and the funneling of the Andean runoff to the Pacific.
(42) Bourgois, J., Guivel, C., Lagabrielle, Y., Calmus, T., Boulègue, J., Daux, V., 2000 Glacial-interglacial trench supply variation, spreading-ridge subduction, and feedback controls on the Andean margin development at the Chile triple junction area (45-48° S), Journal of Geophysical Research, 105, 8355-8386.