Study of a Permafrost Area in the Northern Part of Siberia Using Controlled Source Radiomagnetotellurics

Shlykov, A.; Saraev, A.; Tezkan, B.

doi:10.1007/s00024-020-02621-x

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…Such a procedure slows the production rate and might not be possible in many locations. Recently, Shlykov et al (2020) present an interesting application of the CSRMT method to map and model permafrost in an area located at northern part of Siberia. By using the same data frequency range as presented in Tezkan et al (2019), they could successfully delineate loam and sand horizons using the resistivity models from the 2D inversion of the CSRMT where they also compared the results with the existing borehole data.…”

Section: Introductionmentioning

confidence: 99%

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Radio‐magnetotelluric and controlled‐source magnetotelluric surveys on a frozen lake: Opportunities for urban applications in Nordic countries

Bastani

Wang

Malehmir

et al. 2021

Near Surface Geophysics

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In a novel approach, we have carried out controlled-source and radio-magnetotelluric measurements in the frequency range of 2-250 kHz on a frozen lake located over a planned major multi-lane underground road tunnel near the city of Stockholm. The aim was to gain a better understanding of the resistivity variations above and, potentially, within the crystalline bedrock. Previous studies on the lake water using the boat-towed radio-magnetotelluric technique at the higher end of the frequency band lacked resolution at depth and could not provide conclusive information about bedrock level and potential fracture systems within the bedrock. Taking advantage of Nordic winters, we measured four profiles on the frozen lake complementing the previously acquired boat-towed radio-magnetotelluric data utilizing a double horizontal magnetic dipole transmitter that generated signals down to 1 kHz. The new resistivity models, incorporating the lower frequency data, show improvements and deeper penetrations based on a combined analysis of penetration depth, data misfits and sensitivity studies. The resistivity models also show better correlation with the available high-resolution shallow water seismic reflection data and the geological observations. A potential fracture system within the bedrock can also be inferred better in the new models. The idea of running similar surveys on frozen lakes can be further exploited in similar conditions in countries such as Sweden, where approximately 7% of the land is covered by freshwater bodies and poorly explored for infrastructure planning projects.

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Section: Introductionmentioning

confidence: 99%

“…Recently, Shlykov et al . (2020) present an interesting application of the CSRMT method to map and model permafrost in an area located at northern part of Siberia. By using the same data frequency range as presented in Tezkan et al .…”

Section: Introductionmentioning

confidence: 99%

Radio‐magnetotelluric and controlled‐source magnetotelluric surveys on a frozen lake: Opportunities for urban applications in Nordic countries

Bastani

Wang

Malehmir

et al. 2021

Near Surface Geophysics

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“…First, surveys using the CSRMT method with an HED source were carried out using the scalar variant. Significant experience has been gained in studying the construction routes of a gas pipeline and a railway [13,14], mapping faults [15], studying industrial waste landfills [16], and searching for kimberlite pipes [17].…”

mentioning

confidence: 99%

Use of Subharmonics of Base Frequencies in the CSRMT Method with Loop Sources

Saraev

Bobrov

Shlykov

2023

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In the controlled source radiomagnetotelluric (CSRMT) sounding method, a horizontal magnetic dipole, HMD (vertical loop) or a horizontal electric dipole, and HED (grounded line) are used as sources. When working with HMD, the source is usually tuned to resonance to increase the current in the loop. However, the disadvantage of this approach is the narrow frequency range realized in the CSRMT method (1–12 kHz) and the short operating distance from the source (600–800 m). The need to tune the source to resonance at each selected frequency reduces the efficiency of the survey. In the case of using HED for sounding, measurements are performed in a wider frequency range of 1 to 1000 kHz, and along with the signal of the base frequency, its subharmonics are measured. In this case, emitted signal measurements are possible at a distance of up to 3–4 km from the source. At the same time, the disadvantage of using HED is that it requires grounding, the arrangement of which requires additional time when working on frozen ground or dry stony soil. We consider the possibilities of generation and registration of signals of subharmonics of base frequencies when applying the CSRMT method with loop sources—HMD and VMD (horizontal loop). A matching unit (MU) based on a step-up transformer was developed, which increases the output voltage of the CSRMT transmitter. In a field test with base frequencies of 20, 40, and 80 kHz, the signal amplitudes increased by a factor of two to four for subharmonics at frequencies of 60–200 kHz and by up to 10–13 times for subharmonics at frequencies of 200–500 kHz due to transformation of signal spectrum provided by MU. The possibility of using odd subharmonics of base frequencies for inversion has been demonstrated in the results of field experiments with different sources (HED, HMD, and VMD). This expands the frequency range of the method when working with loop sources and increases the survey’s effectiveness. The use of loop sources in the CSRMT method is especially advantageous for winter work in Arctic regions.

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“…А.В. Вешевым и развиты в последние годы его учениками[14][15][16][17][18][19][20][21][22]. Импедансные измерения проведены микровольтметром-фазометром ИПИ-300.…”

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Electrical Properties and Geoelectric Section of Some Sedimentary Rocks of the Baikal Natural Territory According to Radio Impedance Sounding Data

Bashkuev¹,

Хаптанов²,

Дембелов³

et al. 2022

JRE

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The specific electrical resistance (electrical conductivity) of some layered sedimentary rocks of the Baikal natural territory was measured by the method of radio impedance sounding in the VLF-LF ranges of electromagnetic waves. Their geoelectric sections are determined. Information about the geoelectrical section (GES) of sedimentary rocks of the Baikal natural territory can be used in engineering and geological surveys of the Siberia-Mongolia-China gas pipeline route, as well as in the analysis of the physico-chemical causes of the appearance of corrosion processes on long pipeline structures of the continental regions of Eurasia. The technique of radio impedance sounding can be applied to measure the electrical properties of various soils of a given territory within a layered model of a medium with a poorly and well conductive base.

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Study of a Permafrost Area in the Northern Part of Siberia Using Controlled Source Radiomagnetotellurics

Cited by 9 publications

References 14 publications

Radio‐magnetotelluric and controlled‐source magnetotelluric surveys on a frozen lake: Opportunities for urban applications in Nordic countries

Radio‐magnetotelluric and controlled‐source magnetotelluric surveys on a frozen lake: Opportunities for urban applications in Nordic countries

Use of Subharmonics of Base Frequencies in the CSRMT Method with Loop Sources

Electrical Properties and Geoelectric Section of Some Sedimentary Rocks of the Baikal Natural Territory According to Radio Impedance Sounding Data

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