Necessity of Terrain Correction in Magnetotelluric Data Recorded from Garhwal Himalayan Region, India

The magnetotelluric (MT) method is one of the useful geophysical techniques to investigate deep crustal structures. However, in hilly terrains, e.g., the Garhwal Himalayan region, due to the highly undulating topography, MT responses are distorted. Such responses, if not corrected, may lead to the i...

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Autores principales:	Dharmendra Kumar, Arun Singh, Mohammad Israil
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	magnetotelluric terrain correction 3D modeling and inversion Garhwal Himalayan Corridor Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/9e142abfe68041e88c9bc336e88802d1
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id	oai:doaj.org-article:9e142abfe68041e88c9bc336e88802d1
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spelling	oai:doaj.org-article:9e142abfe68041e88c9bc336e88802d12021-11-25T17:43:23ZNecessity of Terrain Correction in Magnetotelluric Data Recorded from Garhwal Himalayan Region, India10.3390/geosciences111104822076-3263https://doaj.org/article/9e142abfe68041e88c9bc336e88802d12021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3263/11/11/482https://doaj.org/toc/2076-3263The magnetotelluric (MT) method is one of the useful geophysical techniques to investigate deep crustal structures. However, in hilly terrains, e.g., the Garhwal Himalayan region, due to the highly undulating topography, MT responses are distorted. Such responses, if not corrected, may lead to the incorrect interpretation of geoelectric structures. In the present paper, we implemented terrain corrections in MT data recorded from the Garhwal Himalayan Corridor (GHC). We used AP3DMT, a 3D MT data modeling and inversion code written in the MATLAB environment. Terrain corrections in the MT impedance responses for 39 sites along the Roorkee–Gangotri profile in the period range of 0.01 s to 1000 s were first estimated using a synthetic model by recording the topography and locations of MT sites. Based on this study, we established the general character of the terrain and established where terrain corrections were necessary. The distortion introduced by topography was computed for each site using homogenous and heterogeneous models with actual topographic variations. Period-dependent, galvanic and inductive distortions were observed at different sites. We further applied terrain corrections to the real data recorded from the GHC. The corrected data were inverted, and the inverted model was compared with the corresponding inverted model obtained with uncorrected data. The modification in electrical resistivity features in the model obtained from the terrain-corrected response suggests the necessity of terrain correction in MT data recorded from the Himalayan region.Dharmendra KumarArun SinghMohammad IsrailMDPI AGarticlemagnetotelluricterrain correction3D modeling and inversionGarhwal Himalayan CorridorGeologyQE1-996.5ENGeosciences, Vol 11, Iss 482, p 482 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	magnetotelluric terrain correction 3D modeling and inversion Garhwal Himalayan Corridor Geology QE1-996.5
spellingShingle	magnetotelluric terrain correction 3D modeling and inversion Garhwal Himalayan Corridor Geology QE1-996.5 Dharmendra Kumar Arun Singh Mohammad Israil Necessity of Terrain Correction in Magnetotelluric Data Recorded from Garhwal Himalayan Region, India
description	The magnetotelluric (MT) method is one of the useful geophysical techniques to investigate deep crustal structures. However, in hilly terrains, e.g., the Garhwal Himalayan region, due to the highly undulating topography, MT responses are distorted. Such responses, if not corrected, may lead to the incorrect interpretation of geoelectric structures. In the present paper, we implemented terrain corrections in MT data recorded from the Garhwal Himalayan Corridor (GHC). We used AP3DMT, a 3D MT data modeling and inversion code written in the MATLAB environment. Terrain corrections in the MT impedance responses for 39 sites along the Roorkee–Gangotri profile in the period range of 0.01 s to 1000 s were first estimated using a synthetic model by recording the topography and locations of MT sites. Based on this study, we established the general character of the terrain and established where terrain corrections were necessary. The distortion introduced by topography was computed for each site using homogenous and heterogeneous models with actual topographic variations. Period-dependent, galvanic and inductive distortions were observed at different sites. We further applied terrain corrections to the real data recorded from the GHC. The corrected data were inverted, and the inverted model was compared with the corresponding inverted model obtained with uncorrected data. The modification in electrical resistivity features in the model obtained from the terrain-corrected response suggests the necessity of terrain correction in MT data recorded from the Himalayan region.
format	article
author	Dharmendra Kumar Arun Singh Mohammad Israil
author_facet	Dharmendra Kumar Arun Singh Mohammad Israil
author_sort	Dharmendra Kumar
title	Necessity of Terrain Correction in Magnetotelluric Data Recorded from Garhwal Himalayan Region, India
title_short	Necessity of Terrain Correction in Magnetotelluric Data Recorded from Garhwal Himalayan Region, India
title_full	Necessity of Terrain Correction in Magnetotelluric Data Recorded from Garhwal Himalayan Region, India
title_fullStr	Necessity of Terrain Correction in Magnetotelluric Data Recorded from Garhwal Himalayan Region, India
title_full_unstemmed	Necessity of Terrain Correction in Magnetotelluric Data Recorded from Garhwal Himalayan Region, India
title_sort	necessity of terrain correction in magnetotelluric data recorded from garhwal himalayan region, india
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/9e142abfe68041e88c9bc336e88802d1
work_keys_str_mv	AT dharmendrakumar necessityofterraincorrectioninmagnetotelluricdatarecordedfromgarhwalhimalayanregionindia AT arunsingh necessityofterraincorrectioninmagnetotelluricdatarecordedfromgarhwalhimalayanregionindia AT mohammadisrail necessityofterraincorrectioninmagnetotelluricdatarecordedfromgarhwalhimalayanregionindia
_version_	1718412060538175488

Necessity of Terrain Correction in Magnetotelluric Data Recorded from Garhwal Himalayan Region, India

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