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Formation of methane concentration and electromagnetic-field anomalies in southwestern Peter the Great Gulf (Sea of Japan)

B. A. Burov, A. I. Obzhirov, A. I. Gresov, A. S. Salomatin, E. V. Maltseva, Yu. A. Telegin, I. G. Yugai and A. V. Yatsuk
Formation of methane concentration and electromagnetic-field anomalies in southwestern Peter the Great Gulf (Sea of Japan)
Russian Geology and Geophysics (September 2018) 59 (9): 1182-1191

Abstract

We report methane concentrations in the bottom water layer and the upper layer of bottom sediments and the results of acoustic explorations of methane seeps on the shelf bordering the continental slope of the Sea of Japan region, in which electromagnetic Schumann's resonance oscillations were earlier recorded at continental-slope water depths of 500, 1000, and 2000 m. The occurrence of Schumann's resonances at such great depths is explained by an increase (a factor of more than 25) in the electrical resistivity of a approximately 2000 m thick sediment layer with the pore space largely filled with free methane. A new method is proposed for determining the depth of the sources of anomalous concentrations of methane in bottom sediments or in the bottom water layer on a deep shelf. The method is based on recording Schumann's resonances during measurements of the natural electric field at a series of increasing depths in areas bordering the continental slope.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 59
Serial Issue: 9
Title: Formation of methane concentration and electromagnetic-field anomalies in southwestern Peter the Great Gulf (Sea of Japan)
Affiliation: Russian Academy of Sciences, Far East Branch, V.V. Il'ichev Pacific Oceanological Institute, Vladivostok, Russian Federation
Pages: 1182-1191
Published: 201809
Text Language: English
Publisher: Allerton Press, New York, NY, United States
References: 20
Accession Number: 2022-003818
Categories: Economic geology, geology of energy sourcesOceanographyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 1 table, geol. sketch maps
N42°46'01" - N42°46'01", E131°54'59" - E131°54'59"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2022
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