Magnetotelluric power line noise removal using temporally varying sinusoidal subtraction of the grid utility frequency

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F23%3A00574381" target="_blank" >RIV/67985530:_____/23:00574381 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1007/s00024-023-03323-w" target="_blank" >https://link.springer.com/article/10.1007/s00024-023-03323-w</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00024-023-03323-w" target="_blank" >10.1007/s00024-023-03323-w</a>

Result language

angličtina

Original language name

Magnetotelluric power line noise removal using temporally varying sinusoidal subtraction of the grid utility frequency

Original language description

The magnetotelluric method relies on variations of natural electromagnetic fields, which in the vicinity of human settlements are persistently distorted by anthropogenic electromagnetic noise. A large source of noise to the magnetotelluric response is caused by the harmonic oscillations of the power network utility frequency centered on 50/60 Hz along with the associated higher harmonics. Removing this type of noise is essential for high frequency magnetotelluric measurements used for shallow surveys. There are a large number of approaches for how to treat power line noise in magnetotelluric signals, however, commonly used methods do not take into account time variations/instabilities of the utility frequency. That is not serious problem in vicinity of well balanced grid networks, but can cause issues in regions with larger utility frequency variations. Under such conditions, commonly used methods loose more of the natural signal, which is undesirable especially in case of very noisy datasets. Hence, we adopted approach for removing of power line noise with respect to time variations of the utility frequency and applied it to magnetotelluric signals to preserve more of natural signal. The method is based on modelling of the grid network harmonic oscillations by the optimum utility frequency and its integer multiples. The resulting sum of sinusoidal signals is subsequently subtracted from recorded data and only particular noise frequencies are removed from the original signal with high precision, while frequency ranges around power line harmonics are cleaned.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10508 - Physical geography

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Pure and Applied Geophysics

ISSN

0033-4553

e-ISSN

1420-9136

Volume of the periodical

180

Issue of the periodical within the volume

9

Country of publishing house

DE - GERMANY

Number of pages

15

Pages from-to

3303-3317

UT code for WoS article

001021371600001

EID of the result in the Scopus database

2-s2.0-85163795043