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  3D Inversion of Loop-Source Time-Domain Electromagnetic Data - Application to Synthetic & Field Data

Yogeshwar, P., Liu, Y., Peng, R., Blanco-Arrué, B., Nienhaus, H., Hu, X. (2024): 3D Inversion of Loop-Source Time-Domain Electromagnetic Data - Application to Synthetic & Field Data. - In: Börner, J., Yogeshwar, P. (Eds.), - Protokoll über das 30. Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung: St. Marienthal, 25. September - 29. September 2023, 30. Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung (St. Marienthal 2023), 24-24, 1 p.

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5026080 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5026080_3
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https://gfzpublic.gfz-potsdam.de/pubman/item/item_5026039 (Supplementary material)
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 Creators:
Yogeshwar, P.1, Author
Liu, Y.1, Author
Peng, R.1, Author
Blanco-Arrué, B.1, Author
Nienhaus, H.1, Author
Hu, X.1, Author
Affiliations:
130. Kolloquium, 2023, Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung EMTF, External Organizations, ou_5026038              

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 Abstract: Multi-dimensional inversion of Transient electromagnetic data is a computationally expensive task. Only few developments and practical interpretation tools exist. Here, we present a multidimensional inversion framework for loop source time-domain electromagnetic data. The developed algorithm is a robust, efficient, and user-oriented tool for the multi-dimensional inversion of typical loop source time-domain electromagnetic configurations. A time-domain finite volume discretization and the direct solver MUMPS are utilized to solve the 3D TEM forward problem. An iterative Gauss-Newton optimization method is implemented for the inversion kernel. The code is parallelized for calculating multiple sources simultaneously to accelerate the inversion. Based on exploration tasks, different configurations exist for commonly used loop source TEM configurations and typical field scales. Synthetic examples are used to verify the effectiveness and benchmark the developed 3D algorithm. Considering that TEM data is often gathered along profiles, adjusting the model roughness along the different modeling domain directions, sufficiently constrains to allow for 2D imaging. In addition to the vertical signal components, we also included horizontal components for large scale fixed loop applications. Subsequent to synthetic validation, the inversion algorithm is further verified using ~120 dense TEM soundings collected over a clay pan site in the Atacama Desert, Chile, to provide bedrock geometry information and suitable coring sites. The 3D inversion result provided an excellent depth estimate of sedimentary infill as well as the bedrock topography and was later confirmed by deep coring. Another interesting site is the Roter Kamm impact crater in Namibia. Our preliminary results obtained from largescale multicomponent fixed loop TEM data reveal a sedimentary infill down to ~300 m depth. In conclusion, our presented 3D inversion code is capable to handle data from various exploration scenarios and provides a robust tool for advanced EM interpretation.

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Language(s): eng - English
 Dates: 20242024
 Publication Status: Finally published
 Pages: 1
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: -
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Title: 30. Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung
Place of Event: St. Marienthal
Start-/End Date: 2023-09-25 - 2023-09-29

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Title: Protokoll über das 30. Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung: St. Marienthal, 25. September - 29. September 2023
Source Genre: Proceedings
 Creator(s):
Börner, Jana1, 2, Editor
Yogeshwar, Pritam2, 3, Editor
Affiliations:
1 Technische Universität- Bergakademie Freiberg , ou_persistent22            
2 30. Kolloquium, 2023, Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung EMTF, External Organizations, ou_5026038            
3 Universität zu Köln, ou_persistent22            
Publ. Info: Potsdam : Deutsche Geophysikalische Gesellschaft e. V.
Pages: 146 Volume / Issue: 30 Sequence Number: 6 Start / End Page: 24 - 24 Identifier: ISSN: 2190-7021