Articles | Volume 31, issue 1
https://doi.org/10.5194/npg-31-175-2024
https://doi.org/10.5194/npg-31-175-2024
Research article
 | 
28 Mar 2024
Research article |  | 28 Mar 2024

Modelling of the terrain effect in magnetotelluric data from the Garhwal Himalaya region

Suman Saini, Deepak Kumar Tyagi, Sushil Kumar, and Rajeev Sehrawat

Related subject area

Subject: Predictability, probabilistic forecasts, data assimilation, inverse problems | Topic: Solid earth, continental surface, biogeochemistry | Techniques: Theory
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Cited articles

Cagniard, L.: Basic theory of the magneto-telluric method of geophysical prospecting, Geophysics, 18, 605–635, 1953. 
Changhong, L.: The effects of 3D topography on controlled-source audio-frequency magnetotelluric responses, Geophysics, 83, Wb97–wb108, https://doi.org/10.1190/geo2017-0429.1, 2018. 
Chouteau, M. and Bouchard, K.: Two-dimensional terrain correction in magnetotelluric Surveys, Geophysics, 53, 854–862, 1988. 
Coggon, H.: Electromagnetic and electrical modeling by the finite-element method, Geophysics, 36, 132–155, 1971. 
Faradzhev, A. S., Kakhramanov, K. K., Sarkisov, G. A., and Khalilova, N. E.: On effects of terrain on magnetotelluric sounding (MTS) and profiling (MTP), Izvestia Earth Physics, 5, 329–330, 1972. 
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Short summary
This work explores the effect of topography on magnetotelluric (MT) data along a synthetic model of the Roorkee–Gangotri profile (RGP). Two correction procedures were used to remove topography distortion from MT data. Flat-earth and terrain correction responses (TCRs) show that both procedures are capable of removing the topography effect. The similar topographic response and TCRs confirm that there is no need for topography correction along the RGP, as the slope angle is less than 1°.