Closing the gap between galvanic and inductive methods: EEMverter, a new inversion tool for Electric and Electromagnetic data with focus on Induced Polarization

EEMverter is a modelling software specifically developed to model electric and electromagnetic data taking into account the IP phenomenon. Four distinctive features have been implemented in EEMverter: i) selectable IP parameterisations are allowed, ranging from Constant Phase Angle to Debye-Warburg decomposition, also making use of petrophysical relation for defining IP parameters in terms of hydraulic properties; ii) 1D, 2D and 3D forward modelling can be mixed sequentially or simultaneously in the iterative process within multiple inversion cycles, for diminishing the computational burden; iii) the joint inversion of Airborne IP (AIP), ground EM-IP and ground galvanic IP data is fully supported with a common IP parameterization; iv) time-lapse inversions of AIP, EM and galvanic IP data is possible with both sequential and simultaneous approaches. EEMverter is distributed freeware in its LITE version, which allows to run modelling of galvanic data with induced polarization and of ground-based inductive data, together with EEMstudio, a QGIS plugin for data visualization processing in GIS environment. We believe that EEMverter, with its common inversion environment for the IP inversion of inductive and galvanic data will help in closing the gap between galvanic and inductive IP.