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Abstract:
We analyse 22,504 receiver functions obtained from 1162 seismic stations from 10 permanent and 32 temporary networks in South America. This region has been affected by the interaction of the subduction of the Nazca slab, which has changed its geometry through geologic time, breaking up and leaving fossil remnants or bucking it up above the 660. The receiver functions complexity and the topography of the upper mantle discontinuities correlate with the interaction of the Nazca plate with the upper mantle and mantle transition zone, the presence of a remnant slab segment and the hydration due to the slab.