ALBERT

Description: The subduction zone of central Chile (36° S) has produced some of the world's largest earthquakes and significant volcanic eruptions. Understanding the fluid fluxes and structure of the subducting slab and over-riding plate can provide insight into the tectonic processes responsible for both seismicity and magmatism. Magnetotellurics (MT) is a geophysical method which is sensitive to conductive anomalies (e.g. partial melt and brines) in the subsurface. This dataset includes MT EDI data files for 38 sites collected along a profile in central Chile and western Argentina in 2016 and 2017. It includes 19 long period (10 s to 10000 s) MT stations and 19 broadband (0.001 s to 1000 s) MT stations. Four of the broadband MT sites were collected by Alterra Power Corp (now Innergex Renewable Energy Inc.) labelled MU-002, MU-003, MU-011, and MU-019 (Hickson et al., 2011). Four of the long period sites in Argentina are taken from Burd et al. (2014). This dataset also includes two geo-referenced 2-D resistivity models and the inversion parameters used to produce the model. The nonlinear conjugate gradient algorithm of Rodi and Mackie (2001) was used to produce this model. The first is the unconstrained case where no slab tear was imposed (MODEL_UNCONSTRAINED). In this folder is the geo-referenced model (longitude, latitude, depth (km b.s.l.), resistivity) as well as a folder containing the inversion input files. The second is the constrained case where a slab tear was imposed (MODEL_CONSTRAINED). This also includes a geo-referenced model (longitude latitude depth resistivity) text file and a folder containing the inversion input files.