Plain Language Summary Copahue volcano straddling the edge of the Agrio-Caviahue caldera along the Chile-Argentina border in the southern Andes has been in unrest since inflation began in late 2011. Its asymmetric deformation pattern extending into the caldera observed by radar interferometry suggests a complex magma plumbing system. We constrain models of its plumbing system with satellite and airborne interferometric synthetic aperture radar (InSAR) surface displacement observations. Displacement time series from RADARSAT-2 and COSMO-SkyMed satellite data span the entire inflation period from 2011 to 2016, with their initially high rates of 12 and 15 cm/yr, respectively, slowing only slightly through 2016. InSAR observations for the 2013-2016 time period constrain a two-source compound dislocation model, with a rate of volume increase of 13 x 10(6) m(3)/yr. They consist of a shallow, near-vertical, elongated source centered at 2.5 km beneath the summit, and a deeper, shallowly plunging source centered at 7 kmdepth connecting the shallow source to the deeper caldera. The deeper source is located directly beneath the volcano tectonic seismicity with the lower bounds of the seismicity parallel to the plunge of the deep source. This suggests adeep conduit or transfer zone where magma moves from the central caldera to Copahue's upper edifice.