Processing of noisy magnetotelluric time series from Koyna-Warna seismic region, India: a systematic approach

<p>Rolling array pattern broad band magnetotelluric (MT) data was acquired in the Koyna-Warna (Maharashtra, India) seismic zone during 2012-14 field campaigns. The main objective of this study is to identify the thickness of the Deccan trap in and around the Koyna-Warna seismic zone and to del...

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Main Authors: Ujjal K. Borah, Prasanta K. Patro, Vaddeboina Suresh
Format: Article
Language:English
Published: Istituto Nazionale di Geofisica e Vulcanologia (INGV) 2015-06-01
Series:Annals of Geophysics
Subjects:
Online Access:http://www.annalsofgeophysics.eu/index.php/annals/article/view/6690
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spelling doaj-512c647809f142ccbf77d3ba109d4e7e2020-11-24T23:58:50ZengIstituto Nazionale di Geofisica e Vulcanologia (INGV)Annals of Geophysics1593-52132037-416X2015-06-0158210.4401/ag-66906029Processing of noisy magnetotelluric time series from Koyna-Warna seismic region, India: a systematic approachUjjal K. Borah0Prasanta K. Patro1Vaddeboina Suresh2CSIR- National Geophysical Research Institute, Magnetotellurics and Deep Resistivity Sounding Division, Hyderabad,CSIR- National Geophysical Research Institute, Magnetotellurics and Deep Resistivity Sounding Division, Hyderabad,CSIR- National Geophysical Research Institute, Magnetotellurics and Deep Resistivity Sounding Division, Hyderabad,<p>Rolling array pattern broad band magnetotelluric (MT) data was acquired in the Koyna-Warna (Maharashtra, India) seismic zone during 2012-14 field campaigns. The main objective of this study is to identify the thickness of the Deccan trap in and around the Koyna-Warna seismic zone and to delineate the electrical nature of the sub-basalt. The MT data at many places got contaminated with high tension power line noise due to Koyna hydroelectric power project. So, in the present study an attempt has been made to tackle this problem due to 50 Hz noise and their harmonics and other cultural noise using commercially available processing software MAPROS. Remote site was running during the entire field period to stand against the cultural noise problem. This study is based on Fast Fourier Transform (FFT) and mainly focuses on the behaviour of different processing parameters, their interrelations and the influences of different processing methods concerning improvement of the S/N ratio of noisy data. Our study suggests that no single processing approach can give desirable transfer functions, however combination of different processing approaches may be adopted while processing culturally affected noisy data.</p>http://www.annalsofgeophysics.eu/index.php/annals/article/view/6690MagnetotelluricsKoynaTime series processingCultural noiseRemote reference
collection DOAJ
language English
format Article
sources DOAJ
author Ujjal K. Borah
Prasanta K. Patro
Vaddeboina Suresh
spellingShingle Ujjal K. Borah
Prasanta K. Patro
Vaddeboina Suresh
Processing of noisy magnetotelluric time series from Koyna-Warna seismic region, India: a systematic approach
Annals of Geophysics
Magnetotellurics
Koyna
Time series processing
Cultural noise
Remote reference
author_facet Ujjal K. Borah
Prasanta K. Patro
Vaddeboina Suresh
author_sort Ujjal K. Borah
title Processing of noisy magnetotelluric time series from Koyna-Warna seismic region, India: a systematic approach
title_short Processing of noisy magnetotelluric time series from Koyna-Warna seismic region, India: a systematic approach
title_full Processing of noisy magnetotelluric time series from Koyna-Warna seismic region, India: a systematic approach
title_fullStr Processing of noisy magnetotelluric time series from Koyna-Warna seismic region, India: a systematic approach
title_full_unstemmed Processing of noisy magnetotelluric time series from Koyna-Warna seismic region, India: a systematic approach
title_sort processing of noisy magnetotelluric time series from koyna-warna seismic region, india: a systematic approach
publisher Istituto Nazionale di Geofisica e Vulcanologia (INGV)
series Annals of Geophysics
issn 1593-5213
2037-416X
publishDate 2015-06-01
description <p>Rolling array pattern broad band magnetotelluric (MT) data was acquired in the Koyna-Warna (Maharashtra, India) seismic zone during 2012-14 field campaigns. The main objective of this study is to identify the thickness of the Deccan trap in and around the Koyna-Warna seismic zone and to delineate the electrical nature of the sub-basalt. The MT data at many places got contaminated with high tension power line noise due to Koyna hydroelectric power project. So, in the present study an attempt has been made to tackle this problem due to 50 Hz noise and their harmonics and other cultural noise using commercially available processing software MAPROS. Remote site was running during the entire field period to stand against the cultural noise problem. This study is based on Fast Fourier Transform (FFT) and mainly focuses on the behaviour of different processing parameters, their interrelations and the influences of different processing methods concerning improvement of the S/N ratio of noisy data. Our study suggests that no single processing approach can give desirable transfer functions, however combination of different processing approaches may be adopted while processing culturally affected noisy data.</p>
topic Magnetotellurics
Koyna
Time series processing
Cultural noise
Remote reference
url http://www.annalsofgeophysics.eu/index.php/annals/article/view/6690
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AT vaddeboinasuresh processingofnoisymagnetotellurictimeseriesfromkoynawarnaseismicregionindiaasystematicapproach
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