Conductivity distribution beneath Lascar volcano (Northern Chile) and the Puna, inferred from magnetotelluric data

During two field campaigns in 2007 and 2010, long-period and broadband magnetotelluric measurements were conducted in the Central Andes of northern Chile and northwestern Argentina at a latitude of 23.7°S. The study area spans from the Precordillera over the active volcanic arc of the Western Cordillera until the western part of the Puna. A special focus was on Lascar, a subduction related stratovolcano with an historical activity characterized by fumarolic emissions and occasional sub-plinian eruptions, like the one occurred on 1993. The broadband instruments, covering a period range between T=0.005s and 1000s, were installed in the proximities of Lascar volcano, while the long-period devices (T=10s–10,000s) were installed on a profile slightly south of Lascar, crossing the Salar de Atacama basin, the volcanic arc and reaching the western border of the Puna.