9. Controlled Source Audio-Frequency Magnetotellurics

Abstract

PreviousNext No AccessElectromagnetic Methods in Applied Geophysics: Volume 2, Application, Parts A and B9. Controlled Source Audio-Frequency MagnetotelluricsAuthors: Kenneth L. ZongeLarry J. HughesKenneth L. ZongeZonge Engineering & Research Organization, Inc., Tucson, Arizona, USTerra Graphics, Kingston Spring, Tennessee, USSearch for more papers by this author and Larry J. HughesZonge Engineering & Research Organization, Inc., Tucson, Arizona, USTerra Graphics, Kingston Spring, Tennessee, USSearch for more papers by this authorhttps://doi.org/10.1190/1.9781560802686.ch9 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract INTRODUCTION Controlled source audio-frequency magnetotellurics (CSAMT) is a frequency-domain electromagnetic sounding technique which uses a fixed grounded dipole or horizontal loop as an artificial signal source. CSAMT is similar to the natural-source magnetotellurics (MT) and audio-frequency magnetotellurics (AMT) techniques; the chief differences center around the use of the artificial CSAMT signal source at a finite distance. The source provides a stable, dependable signal, resulting in higher-precision and more economical measurements than are usually obtainable with natural-source measurements in the same spectral bands. However, the controlled source can also complicate interpretation by adding source effects, and by placing certain logistical restrictions on the survey. In most practical field situations these drawbacks are not serious, and the method has proven particularly effective in mapping the top 2 to 3 km of the earth's crust. 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Application to data from the Buchans Mine (Newfoundland, Canada)Geophysical Journal International, Vol. 154, No. 3The effect of dipole position errors on E-field measurements in electrical geophysical surveys: is close enough good enough?21 February 2019 | ASEG Extended Abstracts, Vol. 2003, No. 2Transformation of VLF anomaly maps into apparent resistivity and phaseMichael Becken and Laust B. Pedersen4 April 2003 | GEOPHYSICS, Vol. 68, No. 22.5‐D inversion of frequency‐domain electromagnetic data generated by a grounded‐wire sourceYuji Mitsuhata, Toshihiro Uchida, and Hiroshi Amano11 November 2002 | GEOPHYSICS, Vol. 67, No. 6Appraisal of the Tokaanu–Waihi geothermal field and its relationship with the Tongariro geothermal field, New ZealandGeothermics, Vol. 31, No. 1CSAMT exploration at Sellafield: Characterization of a potential radioactive waste disposal siteMartyn J. Unsworth, Xinyou Lu, and M. Don Watts7 February 2012 | GEOPHYSICS, Vol. 65, No. 4Inversion of controlled‐source tensor magnetotelluric data for a layered earth with azimuthal anisotropyXiaobo Li, Behrooz Oskooi, and Laust B. Pedersen7 February 2012 | GEOPHYSICS, Vol. 65, No. 22-D electromagnetic modeling by finite‐element method with a dipole source and topographyYuji Mitsuhata7 February 2012 | GEOPHYSICS, Vol. 65, No. 2Advantages of field component inversion of CSAMT dataPartha S. Routh and Douglas W. Oldenburg4 January 2005Inversion of controlled source audio‐frequency magnetotellurics data for a horizontally layered earthPartha S. Routh and Douglas W. Oldenburg7 July 1999 | GEOPHYSICS, Vol. 64, No. 6On the interference of man-made EM fields in the magnetotelluric ‘dead band’24 December 2001 | Geophysical Prospecting, Vol. 47, No. 5Rapid relaxation inversion of CSAMT dataGeophysical Journal International, Vol. 138, No. 2Surface seismic and electrical methods to detect fluids related to faulting20 September 2012 | Journal of Geophysical Research: Solid Earth, Vol. 100, No. B7On small-scale near-surface distortion in controlled source tensor electromagnetics1Geophysical Prospecting, Vol. 42, No. 5Geophysical exploration for epithermal gold depositsJournal of Geochemical Exploration, Vol. 36, No. 1-3 Electromagnetic Methods in Applied Geophysics: Volume 2, Application, Parts A and BISBN (print):978-1-56080-022-4ISBN (online):978-1-56080-268-6Copyright: 1991 Pages: 991 publication data© 1991 All rights reserved. No part of this publication may be reproduced or distributed in any form or by any means without written permission of the publisherPublisher:Society of Exploration Geophysicists HistoryPublished in print: 01 Jan 1991 CITATION INFORMATION Kenneth L. Zonge and Larry J. Hughes, (1991), "9. Controlled Source Audio-Frequency Magnetotellurics," Investigations in Geophysics : 713-810. https://doi.org/10.1190/1.9781560802686.ch9 Plain-Language Summary PDF DownloadLoading ...