Seismic imaging of a lithospheric-scale magma plumbing system.
3 low velocity bodies in the mid-crust beneath the active volcanic arc and backarc.
The mid-crustal magma reservoir beneath the Cerro Galan Caldera contains ∼22% melt.
Slow upper mantle velocities are indicative of a MASH zone with ∼4–9% melt.
A large MASH zone underlies the southern Puna Plateau as a result of delamination.