b'Conferences and eventsNewsAEGC 2021: Workshop on frontiers of AEM inversion and interpretation for minerals, energy and groundwater applicationsAlan Yusen Ley-Cooper and Anandaroop RayLindsey Heagy (University of British Columbia, Vancouver): Geoscience AustraliaElectromagnetic modelling and inversion toolsYusen.LeyCooper@ga.gov.au Anandaroop.Ray@ga.gov.auSummaryAs part of the recent AEGC 2021 conference, we held a virtual workshop focusing on the state-of-the-art in airborne electromagnetics (AEM) and its uses, entitled Frontiers of AEM inversion and interpretation for minerals, energy and groundwater. It was an all-day event held on Tuesday, 14 September 2021. With over 50 registrants, the workshop connected the theoretical background of electromagnetic geophysics and inversion to the interpretation of AEM imagingLindsey spoke about the importance of communities products. developing open-source tools for modelling and inversion of electromagnetic data and the growth of an open-source The community got a comprehensive look at the currentecosystem. She provided a comprehensive run-down on the practices around AEM inversion methodologies and saw someformulation of the inversion difficulty, dealing with an ill-posed, practical applications through case studies and examplesnon-unique problem and the theoretical framework to operate worldwide. Yusen Ley-Cooper and Anand Ray from Geosciencewithin. A) Tikhonov (deterministic) inversion in which a single Australia (GA) chaired the workshop. The programme kickedbest solution solving optimization is sought, or B) a Bayesian off by welcoming people from five different continents and(probabilistic) inversion where an ensemble of thousands of many time zones, with scene-setting by Yusen, in light of themodels that fit the data is proposed. The talk showed some of expanding number of AEM end-product users and increasingher active research areas, such as sparse and compact norms number of line kilometres flown. The morning session touchedfor sharpening layer boundaries, including petrophysical on modern inversion, inference and uncertainty estimationinformation, joint inversions and progressing 3D inversions. She methods presented by academia, industry, CSIRO and GA. Thealso provided several helpful links to educational material and afternoon session focused mainly on interpretation and casesoftware packages, which we have collated with others and studies.included at the end of this manuscript.Rod Paterson (Intrepid Geophysics): 2.5D inversion approaches Introduction and managing IP / SPM effectsThe workshops started with a casual conversation around the pertinence of distinguishing between AEM data and models of AEM data, what is actually resolvable from this kind of data, and the uncertainties associated with inverted models. How models are derived through the process of inversion and the assumptions involved were discussed in detail.The benefits, limitations and future directions of various inversion techniques were also discussed, followed by a series of examples and case studies that described the speakers experiences using AEM across regional, mineral and groundwater applications.Rod presented on inverting AEM data with what is known as a Dr Lindsey Heagy provided the keynote speech from the2.5D approach and dealing with what was termed as geo-electrical University of British Columbia, Vancouver. Rod Patersonnoise (induced polarization and superparamagnetic effects) in (Intrepid) and Andrea Viezzoli (Aarhus Geophysics) presentedAEM data. The talk discussed the effects of topography, sharp on the state-of-the-art from their respective groups softwareboundaries and artefacts in 1D modelling. As part of Intrepids developments - mainly focusing on 2.5D inversion, inducedlatest developments, the presentation summarised including polarization (IP) and superparamagnetic (SPM) effects in themagnetic susceptibility as a term used to deal with so-called airborne data. A range of other speakers showcased their work,superparamagnetic effects in AEM data, a form of magnetization then the workshop closed with some lively but constructivecommonly attributed to ferrimagnetic nanoparticles. The talk discussion. showed a few case studies, including the widely studied Valen target in the Musgraves, showcasing modelling the AEM data with Quotes extracted from the speakers talks are used to summarisetheir in-house software and comparing the results against other their presentation. models derived from different algorithms.OCTOBER 2021 PREVIEW 28'