Journal article

Magnetotelluric measurements along a reflection seismic profile: reprocessing and reinterpretation of MT data for crustal-scale electric resistivity structure in central Victoria, Australia

Seong Kon Lee, Tae Jong Lee, Toshihiro Uchida, In Hwa Park, Tim Rawling, Jim Cull, Yoonho Song

GEOSCIENCES JOURNAL | GEOLOGICAL SOCIETY KOREA | Published : 2013

Abstract

Magnetotelluric(MT) soundings were done in Central Victoria, Australia, to investigate the electrical conductivity structure of the Bendigo and Melbourne structural zones. We reprocess and reinterpret the MT data, which were acquired along the same path as the seismic transect in 2006 by GeoScience Victoria (GSV). Deep crustal faulting in this region is considered to be responsible for significant mineralization and magmatic processes. The resulting two dimensional (2D) MT conductivity model is consistent with the seismic interpretation in that it clearly shows known boundaries as well, as additionally reveals four clearly isolated resistors, which could be hardly imaged by reflection seismi..

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Funding Acknowledgements

This work was performed as joint research work between KIGAM, Korea, AIST, Japan, and Monash University, Australia. Eight Phoenix MT instruments for data acquisition were provided with the help of KIGAM, Korea and AIST, Japan, and field accommodation and transportation were provided by Monash, University, supported by Department of Primary Industry, Geoscience Victoria, Australia. We authors thank Drs. O'Shea, P. and Korsch, R. for providing migrated seismic data for comparison and interpretation of MT data. Works of Lee, S. K., Lee, T.J., Park, I. H. and Song, Y. are supported by Basic Research Project of KIGAM, funded by the Korean Government. Works of Uchida, T. is supported by AIST, Japan, funded by the Japanese Government. We would like to thank MT crews for their help in field data acquisition, and GSV and industrial partners of Gold Undercover initiatives for opportunity of collaboration on magnetotellurics between Korea, Japan, and Australia. We also thank Drs. Juanjo Ledo and Anna Mart for providing WALDIM code.