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Combined use of controlled-source and radio-magnetotelluric methods for near surface studies
Geological Survey of Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
ITSAK, Greece.
2015 (English)Conference paper, Abstract (Refereed)
Abstract [en]

Combination of the controlled source and radio magnetotelluric, the so-called CSRMT, method has been used in modelling near surface electrical resistivity structures with the main aim of studying mineralization and engineering issues. In the controlled source mode, we used a remotely controlled double horizontal magnetic dipole that transmits signal in the frequency range 1-12.5 kHz. The signal sources for the RMT method are the distant radio transmitters in the frequency range 14-250 kHz. Three near surface case studies are presented in this work. In the first case, conductive hydrothermal stockwork copper deposits in an area in Iran were modelled in 2D and the results were compared to the existing borehole information. In the second case located in Greece using the CSRMT method we could model the location and geometry of a subvertical fault that was covered by conductive quaternary sediments. In the third case from Sweden, 3D resistivity models from the inversion of CSRMT data were used to determine presence and boundaries of quick-clay formation and a coarse-grained layer that is in turn responsible for a peculiar retrogressive landslide type in the study area. The three case studies have proven that a combination of controlled source and radio magnetotelluric methods has a considerable potential in addressing near surface problems. Comparison between the existing borehole data and the resistivity models from the inversion of the CSRMT data in each study area revealed reasonable correlation in delineating target structures especially depth to the good conductors. However, special attention needs to be given when using the CSMT data, especially at lower frequencies where they may be affected by the near-field phenomenon.

Place, publisher, year, edition, pages
2015. Vol. 1, 1-4 p.
Series
, ASEG Extended Abstracts
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-291347DOI: 10.1071/ASEG2015ab255OAI: oai:DiVA.org:uu-291347DiVA: diva2:925318
Conference
24th International Geophysical Conference and Exhibition, ASEG-PESA, 15-18 February 2015, Perth, Australia
Available from: 2016-05-01 Created: 2016-05-01 Last updated: 2016-06-20Bibliographically approved

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Malehmir, Alireza
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