Universität zu Köln

Göçer, Burak F. ORCID: 0009-0001-4706-9510, Mörbe, Wiebke ORCID: 0000-0002-3959-6951, Tezkan, Bülent ORCID: 0000-0002-3326-6353, Israil, Mohammad and Yogeshwar, Pritam ORCID: 0000-0001-9425-9838 (2025). 3D Inversion of Radiomagnetotelluric Data From the Sub‐Himalayan Fault Zone, India—Combining Scalar, Tensor and Tipper Transfer Functions. Geophysical Prospecting, 73 (6). pp. 1-13. Wiley. ISSN 0016-8025

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Abstract

[Artikel-Nr. e70058] Radiomagnetotellurics (RMTs) is an efficient frequency‐domain electromagnetic technique for mapping subsurface electrical resistivity, particularly suited for near‐surface investigations. This method utilizes commonly available civil and military radio transmitters, broadcasting between 10 kHz and 1 MHz, as sources to measure electric and magnetic field responses at the surface. Modern RMT receiver systems comprise five components (two electrical antennas and three magnetic coils), allowing for the estimation of the full impedance tensor and the tipper transfer function for the vertical magnetic field. In this study, RMT data were acquired to investigate the shallow structure of the Himalayan Frontal Thrust (HFT) fault in the Sub‐Himalayan region around Uttarakhand, India. Data were collected at 312 stations along eight profiles over an area of roughly 500 m × 70 m. The dense station distribution enables a 3D inversion of the dataset in the extended frequency range of up to 1 MHz. The observed data were processed using scalar as well as tensor estimations to obtain full impedances and tipper transfer function. We integrated scalar‐estimated data from zones with an approximately 2D conductivity distribution in the full‐tensor dataset. This approach ensured robust 3D modelling during the initial RMT inversion performed with the ModEM algorithm. To date, a joint 3D interpretation of RMT full impedance tensor and tipper transfer function has not yet been reported. Furthermore, the near‐surface manifestations of the HFT have not previously been explored by RMT. The derived 3D model from combined scalar, tensor and tipper data reveals a conductivity contrast zone that aligns well with the HFT fault outcrop and complementary geological information. The derived geo‐electrical structure recovers the local sediment thickness and shallow fault inclination.

Item Type:	Article
Creators:	Creators Email ORCID ORCID Put Code Göçer, Burak F. UNSPECIFIED https://orcid.org/0009-0001-4706-9510 UNSPECIFIED Mörbe, Wiebke moerbe@geo.uni-koeln.de https://orcid.org/0000-0002-3959-6951 UNSPECIFIED Tezkan, Bülent UNSPECIFIED https://orcid.org/0000-0002-3326-6353 UNSPECIFIED Israil, Mohammad UNSPECIFIED UNSPECIFIED UNSPECIFIED Yogeshwar, Pritam Yogeshwar@geo.uni-koeln.de https://orcid.org/0000-0001-9425-9838 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-805158
Identification Number:	10.1111/1365-2478.70058
Journal or Publication Title:	Geophysical Prospecting
Volume:	73
Number:	6
Page Range:	pp. 1-13
Number of Pages:	13
Date:	24 July 2025
Publisher:	Wiley
ISSN:	0016-8025
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Geosciences > Institute for Geophysics and Meteorology
Subjects:	Earth sciences
Uncontrolled Keywords:	Keywords Language 3D inversion ; electromagnetics ; Himalaya ; radiomagnetotellurics ; tensor processing ; tipper English
['eprint_fieldname_oa_funders' not defined]:	Publikationsfonds UzK
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/80515