Electromagnetic Depth Soundings

Vanyan, L. L.; Bobrovnikov, L. Z.; Davidov, V. M.; Kuznetsov, A. N.; Loshenitzina, V. L.; Morozova, G. M.; Shtimmer, A. I.; Terekhin, E. I.

doi:10.1007/978-1-4684-0670-2

Cited by 5 publications

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“…[47] Deep magnetotelluric soundings performed in the active ('hot') regions revealed a layer of conductivity $0.1S/m % 10 9 s À1 at a depth $30 km [Vanyan, 1997]. If a source of the ULF seismogenic radiation is located in that layer, then the wave propagation in such a waveguide is defined not only by the thickness of the waveguide but also by damping on the walls.…”

Section: Discussionmentioning

confidence: 99%

Use of wavelet analysis for detection of seismogenic ULF emissions

2003

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[1] Wavelet analysis is applied to high-resolution magnetic ULF data in a seismoactive region to determine whether there is evidence of ULF electromagnetic emissions that precede or accompany earthquakes. We have developed an algorithm that is specially adapted to the single-station wavelet detection of geomagnetic events. For this purpose we have constructed wavelet-based magnetic signatures of certain earthquakes. Namely, we have used the distribution of energies among blocks consisting of coefficients of wavelet packet transforms. Our computer experiments have shown that common features preceding two strong earthquakes appear in geomagnetic fields recorded close (around 20 km) to the epicenter of the earthquakes. The anomalies occupy a wide range of periods (from 10 s to 250 s). Evidence was also found on the presence of short period seismogenic pulses associated with a strong earthquake (M = 5.6) on March 26, 1997, in Kyushu, Japan. A comparison of extracted geomagnetic variations at two observatories located in its epicentral zone has indicated that seismogenic geomagnetic disturbances occurred 6 to 7 hours prior to the earthquake.

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Section: Discussionmentioning

confidence: 99%

Use of wavelet analysis for detection of seismogenic ULF emissions

2003

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“…The software for calculating response functions of the medium, their analysis, 1-D, 2-D and 3-D modelling and interpretation is very well developed and has been extensively tested over the years during a number of scientific and exploration surveys in different parts of the world (Berdichevsky et al, 2009, Chave et al, 2012, Vanyan, 1997, Zhdanov, 2009).…”

Section: Field Equipment and Data Interpretation Capabilitiesmentioning

confidence: 99%

Particularities of 5-component magnetotelluric soundings application for mineral exploration

Ingerov¹,

Ermolin²,

Belyakov³

2018

ASEG Extended Abstracts

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In the application of electroprospecting for mineral exploration, there are few clearly observed trends based on the development of electroprospecting technologies, hardware, software and computer technologies aimed at: a) the increase of electroprospecting application in comparison with other EM methods; b) application of electroprospecting at all stages of the exploration cycle; c) the increase of application of induction electroprospecting methods and, first of all, these which are based on the study of the natural EM field of the Earth (NEMFE). A special role here is played by the method of Broadband Magnetovariational Profiling (BMVP).Three stages in the application of electroprospecting are quite clearly distinguished: a) exploration for new mining provinces according to the distribution of resistivity in the Earth's crust and upper mantle (the AusLAMP project, a revolutionary idea proposed by Australian scientists; deep MT, scale 1 : 5,000 000 -1 : 1,000 000); b) exploration for large conductive ore bodies, areas with a prospecting survey square area of more than 100 km 2 by airborne geophysics, for areas with smaller size -5-component AMT on a scale of 1 : 200,000 -1 : 50,000; c) detailization and support of drilling operations, mapping of veins and dikes -5-component AMT on the scale 1 : 20,000 -1 : 5,000 in complex areas with induction and geometric soundings using control source if Induced Polarization is an exploration factor.

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“…The BMR technical officers set to work to try and understand the electronics so that Brian Spies brspies@bigpond.net.au 1 Reports of developments in USSR geophysics had begun to reach the West in the late 1960s, e.g. via George Keller in the introduction to Van'yan et al (1967) and via a U.S. Exchange Delegation (Keller et al, 1966). Keller's report focused on Van'yan's deep long-offset TEM sounding, and the US delegation was petroleum oriented.…”

Section: Preview April 2017mentioning

confidence: 99%

Time Domain EM Comes to Australia: the Early History of the MPPO-1

Spies¹

2017

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Electromagnetic Depth Soundings

Cited by 5 publications

References 0 publications

Use of wavelet analysis for detection of seismogenic ULF emissions

Use of wavelet analysis for detection of seismogenic ULF emissions

Particularities of 5-component magnetotelluric soundings application for mineral exploration

Time Domain EM Comes to Australia: the Early History of the MPPO-1

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