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The PUNA Seismic Experiment

The central Andean plateau is a prime region to study mantle flow above an active plateau margin, where it has been suggested that there is a link between plateau uplift and removal of the lower crust and lithospheric mantle. The southern Puna plateau (25°S to 28°S) is characterized by a number of anomalous features with respect to the rest of the Puna-Altiplano plateau including a distinctive spatial and geochemical pattern of mafic lavas and giant ignimbrites, a high topography with a large deficit in crustal shortening, an underlying slab with a gap in teleseismic intermediate depth seismicity, and a transitional dip between a steeper segment to the north and a flat-slab to the south. To investigate mantle deformation patterns across this region a total of 43 US and 30 German broadband seismic stations were deployed across the southern Puna plateau. The region of study has the advantage of deep seismicity and intermediate depth seismicity at the edge of the array which will help to constrain the depth of an anisotropic layer(s) responsible for any shear-wave splitting. Using observations of both teleseismic and local shear-wave splitting, the depth dependence of azimuthal anisotropy beneath the Puna plateau can be constrained.

 

Deploying Seismic Stations In the Puna A map of the Andes A map of the seismic stations in the Puna plateau
chart puna seismic experiment

 

Puna seismic experiment

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Department of Geological Sciences :: College of Arts and Science
University of Missouri-Columbia

last revised: summer 2003
Copyright © The Curators of the University of Missouri