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Yakutsk, Russia

Gaidai N.K.,Russian Academy of Sciences | Kalinina L.Y.,Northeast State University
Journal of Volcanology and Seismology | Year: 2011

This study is concerned with quantitative estimation of the relationship between earthquakes and tectonic crustal fragmentation based on a correlation analysis of fault density with seismicity parameters (the number and energy of earthquakes per unit area) for the Sredne-Yamskoi seismic junction and adjacent area. The highest level of seismic activity and the highest probability of earthquake occurrence with energy classes K ≥ 12 within areas that have a continental crust with a well-pronounced granite layer occur in those areas with the mean fault density. Within areas with a thinner granite layer in the crust, the most likely seismic events are K ≥ 12 earthquakes that occur in areas with lower fault density. We estimated the relationship between the degree of crustal fragmentation and the topography of stratification interfaces in the crust as identified by new interpretative gravimetry. Zones with the lowest degree of fragmentation tend to be areas where the top of the crystalline basement lies deeper. © 2011 Pleiades Publishing, Ltd. Source


Vashchilov Y.Y.,Russian Academy of Sciences | Kalinina L.Y.,Northeast State University
Journal of Volcanology and Seismology | Year: 2010

This paper presents a quantitative analysis of the relationship between earthquakes and crustal tectonic fragmentation based on a correlation analysis of fault density and discordance measure with parameters of seismic activity (the specific number and specific energy of earthquakes) for the Magadan shelf of the Sea of Okhotsk. These materials revealed essential differences in the structural position of earthquakes on land and in sea. The Magadan shelf of the Sea of Okhotsk will most likely generate earthquakes of energy class K ≥ 12 in areas with lower density (0.04 < τ ≤ 0.06 km-1) and lower discordance measure (2 < {norm of matrix}D{norm of matrix} ≤ 4) for the faults identified from gravity data. One cause of this structural and geodynamic feature in the spatial position of earthquake epicenters is, in these authors' opinion, thermal isostasy, that is, the cooling of the lithosphere and asthenosphere as heat is released into the space around the Earth (the heat was entering the upper layers of the Earth from the mantle during the Mesozoic/Cenozoic phase of its development), resulting in seafloor subsidence. Seafloor subsidence and continental uplift produce rotational tangential forces that affect the stress buildup in the Pacific seismic belt. The annual releases of rotational energy and earthquake energy have the same order of magnitude, 1018 J/yr. © Pleiades Publishing, Ltd., 2009. Source


Potapova N.A.,Northeast State University | Pustovoit S.P.,Russian Academy of Sciences | Yusupov P.P.,Pacific Research Fisheries Center
Cytology and Genetics | Year: 2014

The first data on the nucleotide sequences of mitochondrial cytochrome oxidase 1 (CO1) gene of Arctic flounder (L. glacialis) and striped flounder (L. pinnifasciata) from the Sea of Okhotsk was analyzed. Nucleotide variability of mitochondrial cytochrome oxidase gene in 10 species of Arctic flounder (π = 0.00370) is a little lower than in 28 species of striped flounder (π = 0.00446); all species were obtained in the Taui Bay of the Sea of Okhotsk. Disparity index values calculated based upon the nucleotide variability among Arctic flounder species indicated nonselective substitution mode in this case; at the same time, for the striped flounder species, it indicated that approximately one third of substitutions were selective ones. The rate of nucleotide difference between the species of Arctic and striped flounder confirms the species status of Arctic flounder and striped flounder. © 2014, Allerton Press, Inc. Source


Goldfarb Y.I.,Russian Academy of Sciences | Petrov A.N.,Russian Academy of Sciences | Preis V.K.,Northeast State University | Skurida D.A.,OOO Zolotodobyvayushchaya kompaniya
Russian Journal of Pacific Geology | Year: 2015

A new approach to alluvial gold placers is suggested on the basis of research experience from northeastern Russia. Eight dynamic species of alluvial placers (brush, erosion, apron, perluvial, bar, equilibrium, aggradational, and gravitation) are distinguished based on their genetic geological differences. They are distinct in composition; volumetric structure; morphology in plan and in section; position in river valleys of various sizes; and relation to various morphostructures, gold sources, etc. In rich gold regions with numerous gold sources, the different placers are often combined and form complex placer deposits, the most complex of which occur in large valleys. All placer species and their combinations are characterized. Their features should be taken into account in projection, prospecting, exploration, and exploitation. Some directions for the differentiation of these tasks at different stages are suggested. © 2015, Pleiades Publishing, Ltd. Source


Antonova I.V.,RAS Semiconductor Physics Institute | Smagulova S.A.,Northeast State University | Neustroev E.P.,Northeast State University | Skuratov V.A.,Joint Institute for Nuclear Research | And 3 more authors.
Semiconductors | Year: 2011

The method of charge deep-level transient spectroscopy (Q-DLTS) is used to study and compare the ejection of charge carriers from silicon nanocrystals (NCs) located in an ordered or random way in the SiO2 matrix. It is shown that, in all cases, this ejection is a thermally activated process. The parameters of energy barriers characterizing the processes of ejection of charge carriers from the levels of nanocrystals in the layers NCs:SiO2 before (random distribution) and after their modification by irradiation with high-energy ions (ordered distribution of nanocrystals) are determined. It is found that the activation energies for ejection of charge carriers from nanocrystals and the size of nanocrystals estimated from the difference between energies of two levels observed by the Q-DLTS method decrease as the ion fluence is increased. The density of nanocrystals observed by the Q-DLTS method decreases by approximately an order of magnitude as a result of irradiation with fluence of 1012-1013 cm-2 in comparison with an initial unirradiated structure; this decrease is due to formation of conducting chains of nanocrystals in tracks. © 2011 Pleiades Publishing, Ltd. Source

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