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- W4214902529 abstract "PreviousNext No AccessThree-Dimensional Electromagnetics33. Three-Dimensional Transient Electromagnetic Modeling and Its Application to Geothermal ExplorationAuthors: Toru MogiTatsuya KajiwaraElena Y. FomenkoToru MogiDepartment of Mining, Kyushu University, Fukuoka, JapanJMC Geothermal Engineering Co. Ltd., Takizawa, Iwate, JapanInstitute of Geoelectromagnetic Research, Troitsk, Moscow Region, RussiaSearch for more papers by this author, Tatsuya KajiwaraDepartment of Mining, Kyushu University, Fukuoka, JapanJMC Geothermal Engineering Co. Ltd., Takizawa, Iwate, JapanInstitute of Geoelectromagnetic Research, Troitsk, Moscow Region, RussiaSearch for more papers by this author, and Elena Y. FomenkoDepartment of Mining, Kyushu University, Fukuoka, JapanJMC Geothermal Engineering Co. Ltd., Takizawa, Iwate, JapanInstitute of Geoelectromagnetic Research, Troitsk, Moscow Region, RussiaSearch for more papers by this authorhttps://doi.org/10.1190/1.9781560802154.ch33 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Our 3-D finite-element modeling scheme for transient electromagnetic (TEM) data consists of two parts: (1) calculation of the primary electric field of an electric bipole source on a layered earth, and (2) calculation of the secondary electric field caused by induced scattering currents in 3-D anomalous regions. The magnetic field is computed from derivatives of the electric field. The scheme works with harmonic fields; transient (vertical magnetic) fields are obtained by Fourier transformation over a wide frequency range. An aysmptotic boundary condition on the secondary field terminates the finite-element grid. We constructed a 3-D model of the Mori geothermal field in northern Japan from TEM surveys with long-offset electric bipole sources at 86 sites and from a shallow controlled-source magnetotelluric (CSMT) survey. Joint inversion of the TEM and CSMT data gave a preliminary layered-earth model. Modeling of 3-D variations about the layered structure suggests that the reservoir should be developed around the vent of the caldera with hot fluid being supplied from the southwest of the vent. Permalink: https://doi.org/10.1190/1.9781560802154.ch33FiguresReferencesRelatedDetails Three-Dimensional ElectromagneticsISBN (print):978-1-56080-079-8ISBN (online):978-1-56080-215-0Copyright: 1999 Pages: 725 publication data© 1999 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 1999 CITATION INFORMATION Toru Mogi, Tatsuya Kajiwara, and Elena Y. Fomenko, (1999), 33. Three-Dimensional Transient Electromagnetic Modeling and Its Application to Geothermal Exploration, Geophysical Developments Series : 515-524. https://doi.org/10.1190/1.9781560802154.ch33 Plain-Language Summary PDF DownloadLoading ..." @default.
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