Geophysical aspects of man-made electromagnetic noise in the earth—A review

Szarka, László

doi:10.1007/bf01901627

Cited by 105 publications

(51 citation statements)

References 68 publications

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“…Wiener and bandpass filters can be used to reduce high-frequency noise (Thompson and Gist, 1993). Supplementary techniques as delay-line filtering in case of severe noise (Szarka, 1987), and low-pass filtering in case of strong high-frequency noise contamination can be used.…”

Section: Harmonic Noisementioning

confidence: 99%

A review on electrokinetically induced seismo-electrics, electro-seismics, and seismo-magnetics for Earth sciences

Jouniaux

Zyserman

2016

Solid Earth

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Abstract. The seismo-electromagnetic method (SEM) can be used for non-invasive subsurface exploration. It shows interesting results for detecting fluids such as water, oil, gas, CO 2 , or ice, and also help to better characterise the subsurface in terms of porosity, permeability, and fractures. However, the challenge of this method is the low level of the induced signals. We first describe SEM's theoretical background, and the role of some key parameters. We then detail recent studies on SEM, through theoretical and numerical developments, and through field and laboratory observations, to show that this method can bring advantages compared to classical geophysical methods.

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Section: Harmonic Noisementioning

confidence: 99%

A review on electrokinetically induced seismo-electrics, electro-seismics, and seismo-magnetics for Earth sciences

Jouniaux

Zyserman

2016

Solid Earth

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“…Szarka gave a comprehensive review of man-made electromagnetic noise in the Earth [6] . In some cases, sporadic noise caused by some sudden events are also recorded as bad traces which must be isolated since its amplitude deviates far from the average signal level.…”

Section: V(t)=i(t)*g(t)+na (T)+np (T) mentioning

confidence: 99%

Estimation of the earth impulse of MTEM in very noisy environment

Zhang¹,

Di²,

Lei³

2016

Proceedings of the 7th International Conference on Environment and Engineering Geophysics &Amp; Summit Forum of Chinese Academy

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Abstract-we demonstrate how several tools, such as stacking, cross correlation, digital filtering, significantly attenuate the correlated and uncorrelated noise encountered during the estimation of the earth impulse response of multi-transient electromagnetic survey. This study focuses on processing of correlated cultural noise using digital recursive filtering. We also applied this to process the data observed from the MTEM singleline survey conducted over an underground hydrocarbon reservoir.

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“…There is a vast literature about noise in electromagnetic methods, as described in the reviews by Szarka (1988) and Junge (1996). Specifically, the noise generated by an ERW can be classified as active and irregular.…”

Section: Cjrw Noisementioning

confidence: 99%

Disturbances on magnetotelluric data due to DC electrified railway: A case study from southeastern Brazil

2014

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Magnetotelluric (MT) soundings were carried out in the period range of 20 to 6000 s along profiles roughly orthogonal to the Campos do Jordão Railway (CJRW), in the Brazilian southeastern region. The profiles were located over two adjacent regions with contrasting conductivity, the conductive sedimentary region of the Taubaté Basin and the resistive crystalline region of the Serra da Mantiqueira. The railway operates with DC current that produces an intense electromagnetic noise but only during diurnal periods, being turned off at night. The objective of this study is to characterize the CJRW noise in order to verify its effect on MT parameters. It was inferred that the entire length of the Taubaté Basin is probably affected by the noise, whereas in the crystalline terrains the noise reaches distances in the range of 76 to 126 km. The electric channels show a strong dependence on geology which is suggestive of the potential application of the CJRW as a controlled source in geophysical studies. The data were processed with modern techniques presently available to the scientific community. Under the conditions of the present study, it was observed that the robust Single Station technique is as efficient as the robust Remote Reference to remove the kind of noise generated by the CJRW, an intense perturbation that affects only some welldefined portions of the time series. Finally, the analyses reaffirm the necessity of a careful choice of the station to be used as reference in the Remote Reference technique.

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Geophysical aspects of man-made electromagnetic noise in the earth—A review

Cited by 105 publications

References 68 publications

A review on electrokinetically induced seismo-electrics, electro-seismics, and seismo-magnetics for Earth sciences

A review on electrokinetically induced seismo-electrics, electro-seismics, and seismo-magnetics for Earth sciences

Estimation of the earth impulse of MTEM in very noisy environment

Disturbances on magnetotelluric data due to DC electrified railway: A case study from southeastern Brazil

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