GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 3.2 GNGTS 2024 EEMstudio: processing and modelling of electric and electromagnetc data in a QGIS plugin N.A.L. Sullivan 1 , A. Viezzoli 2 , G. Fiandaca 1 1 The EEM Team for Hydro & eXploraton, Department of Earth Sciences “Ardito Desio”, Università degli Studi di Milano, Milano, Italy 2 EMergo S.r.l., Cascina (PI), Italy Introducton In electric and electromagnetc (EM) methods, the typical workfow is acquisiton, processing and modelling. The processing part is where we evaluate the data in order to exclude outliers from the inversion, and prevent the generaton of artfacts in the models that do not refect geology. EM and IP measurements are partcularly afected by coupling with man-made metal structures and random noise, which alter the response of the ground, causing the presence of buried conductors in the model and spoted appearance (Viezzoli et al., 2013). It is therefore important to identfy these interferences and remove these data from the dataset in order to obtain reliable models. Besides automatc processing, the preferred method for this refning is the manual culling of data, supported by a georeferenced map to remove coupling efects. At the moment, many sofware and tools are available for the inversion of electric and electromagnetc data: for instance, there are AarhusInv (Auken et al., 2015), SimPEG (Cocket et al., 2015), the GA AEM programs (Brodie, 2016) and EMagPY (McLachlan et al., 2021) for inductve data and RES2DINV/RES3DINV (Loke, 2004), ResIPy (Blanchy et al., 2020) and pyGIMLi (Rücker et al., 2017) for galvanic data. However, focusing on data processing, the choice is restricted to less optons. The most comprehensive one, with an integrated GIS for data georeferencing is the commercial sofware Aarhus Workbench (Auken et al., 2009), with AarhusInv for inversions (Auken et al., 2015). EEMstudio is a QGIS plugin that allows to process electric and electromagnetc data, always keeping the link with the georeferenced map. It is freeware and open source, under license EUPL 1.2, and available for academic, teaching and professional use. It is going to be distributed together with EEMverter (Fiandaca et al., 2024), a modelling tool for electric and electromagnetc data with focus on induced polarizaton, which will be distributed freely as well for most of the ground-based applicatons. In the following sectons, all parts that consttute the plugin will be presented.