1887

Abstract

Summary

We conducted radiomagnetotelluric (RMT) measurements to investigate the Himalayan frontal thrust fault in the Sub-Himalayan region in India in the framework of the Indo-German joint research collaboration. The overarching aim is the geo-electrical characterization of the fault zone, and the determination of the sediment thickness in the survey area.

The data acquisition was carried out using the RMT SM-25 system, consisting of a receiver unit, two electrical antennas, and three magnetic coils. This enables the estimation of the full RMT impedance tensor and the transfer function for the vertical magnetic field. The RMT method utilizes frequencies between 10 kHz and 1 MHz and is therefore applicable for shallow subsurface investigations. We measured on eight parallel profiles with a profile separation and a station interval of 10m. In total data were acquired at 312 stations in an area of 500 × 70 square meters. The dense station distribution allows for a subsequent 3D inversion of the dataset.

We present a 3D inversion outcome derived from combined scalar, tensor as well as tipper datasets. The derived 3D conductivity model shows a conductivity contrast zone, which correlates well with the outcrop of the HFT fault in the survey area and complementary geological information.

© EAGE Publications BV
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2025-09-07
2026-02-14

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3D Inversion of Tensor RMT Data - Field Application to the Sub-Himalayan Fault Zone
Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.202520084
/content/papers/10.3997/2214-4609.202520084
/content/papers/10.3997/2214-4609.202520084
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