Magnetotelluric investigations in the South and Central American Subduction Zones revealed many electrical conductivity anomalies connected to widespread volcanism and magmatism. Smaller high-conductivity zones may reflect individual magma chambers beneath volcanic edifices at shallow depths (5-8 km), while large-scale anomalies in the mid crust (10-20 km depths) hint at a common magma source for a whole series of volcanoes. However, the by far largest conductive feature is the Altiplano-Puna Magma Body in the Bolivian backarc with a conductance of more than 20.000 Siemens which does not allow to resolve its lower limit. A critical assessment of 3-D inversion results and the influence of far-reaching crustal anisotropy will be discussed in this contribution.

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