Modelling of Terrain Effect from the Magnetotelluric (MT) Field Data
Deepak Kr. Tyagi1, Rajeev Sehrawat2, Rashmi Mittal3, Millan Kr. Bera4, Anil Kr. Sharma5
1Deepak Kumar Tyagi*, Department of Physics, Maharshi Markandeshwar (Deemed to be University), Mullana, Ambala, India.
2Rajeev Sehrawat, Department of Physics, Maharshi Markandeshwar (Deemed to be University), Mullana, Ambala, India.
3Rashmi Mittal, Department of Physics, Maharshi Markandeshwar (Deemed to be University), Mullana, Ambala, India.
4Milan kumar Bera, Department of Physics, Maharshi Markandeshwar (Deemed to be University), Mullana, Ambala, India.
5Anil Kr. Sharma, Department of Physics, Maharshi Markandeshwar (Deemed to be University), Mullana, Ambala, India.
Manuscript received on November 11, 2019. | Revised Manuscript received on 22 November, 2019. | Manuscript published on December 10, 2019. | PP: 5059-5062 | Volume-9 Issue-2, December 2019. | Retrieval Number: B7756129219/2019©BEIESP | DOI: 10.35940/ijitee.B7756.129219
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Magnetotelluric (MT) data were recorded over highly undulating terrain in Himalayan region from Roorkee to Gangotri section in period 0.001-1000 second. In the presence of topographic distortion the interpretation may become misleading. A simple scheme based on finite difference method for the simulation of the topographic distortion in magnetotelluric response is presented. The finite difference based, forward response computation algorithm, has been extended for undulating topography. The distortion coefficients, representing the topographic effect, are designed for correcting the observed distorted impedance tensor recorded in the vicinity of topographic features. The accuracy of the scheme is checked by comparing the computed responses with the finite element, Rayleigh scattering and transmission surface results for transverse electric (TE-mode) and transverse magnetic (TM-mode) responses. The modified algorithm is used to model the terrain effect on MT data recorded from Himalayan terrain.
Keywords: Finite Difference Method, Magnetotellurics (MT), Topographic Distortion, 2D Terrain Model and Correction, TE and TM – mode.
Scope of the Article: Data Modelling, Mining and Data Analytics