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QLD Branch talk - Beyond plates - fast TEM inversion using conductive ellipsoids.

Event Type

Event Date

Tuesday, November 16, 2021

Event Location

Event Address

XXXX Alehouse, Black Street, Milton

Event Start


Event End


Event Details

When: Tuesday 16 November 2021

Time: 17.15 – 19.00 (Finger food from 17.15, Technical Talk from 18.00)

Where: XXXX Alehouse, Black Street, Milton

Details: The event is free for members and $15 for non-members who are welcome to join prior to the meeting. Please register through Eventbrite.

Registration (in person):

Registration (zoom): TBC


ASEG Queensland Branch August Technical Talk

Peter Fullagar - Fullagar Geophysics Pty Ltd.

Beyond plates - fast TEM inversion using conductive ellipsoids Part2: Inversion


Interpreting TEM data in terms of conductive rectangular plates is effective in many situations. However, not all conductors are planar. Triaxial ellipsoid conductors are an attractive alternative: geometrically simple (corner-free), mathematically tractable at early and late time limits, and able to encompass shapes ranging from plates to elongate lenses to equi-dimensional pods. Accordingly a fast magnetostatics-based algorithm has been developed to compute ellipsoidal conductor responses in both resistive and inductive limits. Inversion of measured data then entails adjustment of ellipsoid parameters. The methodology is suitable for downhole, ground, or airborne TEM, either impulse or step response.
In this second of two presentations, the inversion algorithm is described and illustrated on both synthetic and real TEM data. 


Peter Fullagar has over 30 years experience in base metal, precious metal, and petroleum exploration, and in metalliferous and coal mining geophysics. He worked for 12 years with WMC Exploration Division in Australia, including 3 years as Chief Geophysicist. He was the inaugural Chair of Borehole Geophysics at Ecole Polytechnique, Montreal, in 1993-94, and served as team leader in 1995-96 for the CMTE/AMIRA P436 research project on Application of Geophysics to Mine Planning & Operations. Since 1998 Peter has consulted privately and has written modelling and inversion programs for EM, potential fields, and borehole logging data. He led the AMIRA P1022 research project on Rapid 3D Inversion of TEM Data from 2010-2013. Peter is an Adjunct Professor at the WH Bryan Mining and Geology Research Centre, University of Queensland.