International FENICS experiment on the tensor frequency electromagnetic sounding of the lithosphere in the Eastern Baltic (Fennoscandian) Shield

Жамалетдинов, А. А.; Shevtsov, A. N.; Korotkova, T. G.; Kopytenko, Yu. A.; Ismagilov, V. S.; Efimov, B. V.; Баранник, М. Б.; Колобов, В. В.; Prokopchuk, P. I.; Smirnov, Maxim; Vagin, S. A.; Pertel, M.I.; Tereshchenko, E. D.; Vasil’ev, A. N.; Гохберг, М. Б.; Korja, T.

doi:10.1134/s1028334x09060208

Cited by 3 publications

(2 citation statements)

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“…In the electromagnetic probing problems, as a rule, harmonic signal sources are used [10]. When these sig nals are analyzed, the presence of time in each sample of data obtained using the considered system allows one to calculate the amplitude and phase of the signal at each station by the optimal method [11,12].…”

Section: Estimation Of the Amplitude And Phase Of The Harmonic Signalmentioning

confidence: 99%

A firmware system for phase measurements in extremely low and ultralow frequency ranges

2012

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In experimental investigations of artificial and natural signals in extremely low frequency (ELF) and ultra low frequency (ULF) ranges, it is necessary to measure amplitudes and relative phases of the elec tromagnetic field components in a network of stations. The phase measurement includes accurate synchro nization of data with the universal time. In this work, the geophysical data acquisition system, which allows one to synchronize measurement results and the coordinated universal time with an accuracy of a few micro seconds, is described. Methods for processing the electromagnetic field components of the harmonic signal source, recorded by this data acquisition system, are proposed.

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Section: Estimation Of the Amplitude And Phase Of The Harmonic Signalmentioning

confidence: 99%

A firmware system for phase measurements in extremely low and ultralow frequency ranges

2012

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“…4. Apparent resistivity curves (а) and obtained one-dimensional resistivity cross-sections (б) in the Phoenix experiment [Zhamaletdinov et al, 2009[Zhamaletdinov et al, , 2011. The ρ k curves are compiled from several sources.…”

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Multiparameter approach in the deep geoelectrics

Rokityansky

Tereshyn

2021

GZh

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The main provisions of geoelectrics are described, the importance of taking into account the ambiguity of its inverse problem is emphasized. Three main methods of deep geoelectrics which use natural fields of ionospheric-magnetospheric origin are considered: geomagnetic deep sounding (GDS), magnetotelluric sounding (MTS), and magnetovariational profiling (MVP). The response functions of each method are described. Each response function carries its own specific information about some parameters of the studied object and is characterized by the degree of reliability of the information about the object extracted from it. For example, the most reliable information about electrical conductivity anomalies (if any in the study area) is contained in the MVP response functions. The horizontal tensor of the anomalous field contains information about the electrical conductivity under the observation point, and the tipper (induction vector) contains information from the surrounding areas. In general, MVP information is less susceptible to distortions than MTS information and deserves more trust. Artificial field sources in deep geoelectrics are rarely used due to their high cost. Since 1970, two powerful sources created for other purposes arised on the Kola Peninsula and were used for deep sounding. In the center of these studies found themself young talented geologist-geophysicist and organizer of major projects AbdulkhaiAzimovichZhamaletdinov. The «Khibiny» project with an MHD generator and an ultra-deep well as one of the objects of the study, the «Zeus» low-frequency emitter, the signals of which were recorded in China at a distance of 7000 km, and a number of projects conceived and organized by Zhamaletdinov and executed under his leadership: «Volgograd-Donbass» (1979, 1986), experiments «PHOENIX» (2007, 2009, 2014, 2019) and others. At the same time, methods of interpretation were developed for sounding with artificial EM sources and new response functions were obtained which make it possible to «see» the object of research in a new way. This experience must be preserved, generalized, improved and used, for example as follows. In the area of modern synchronous multipoint MTS-MVP survey, a controlled source composed of two grounded lines emits strong current (harmonics at fixed frequencies and/or pulses) which signal will be recorded by survey instruments during night-time sessions.

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Imaging and observing the electrical Moho

Jones

2013

Tectonophysics

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International FENICS experiment on the tensor frequency electromagnetic sounding of the lithosphere in the Eastern Baltic (Fennoscandian) Shield

Cited by 3 publications

References 2 publications

A firmware system for phase measurements in extremely low and ultralow frequency ranges

A firmware system for phase measurements in extremely low and ultralow frequency ranges

Multiparameter approach in the deep geoelectrics

Imaging and observing the electrical Moho

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