On the Use of Calibration Explosions at the Former Semipalatinsk Test Site for Compiling a Travel-time Model of the Crust and Upper Mantle     

N.N. Belyashova  V.I. Shacilov  N.N. Mikhailova  I.I. Komarov  Z.I. Sinyova  A.V. Belyashov  M.N. Malakhova 《Pure and Applied Geophysics》2001,158(1-2):193-209

—?Two chemical calibration explosions, conducted at the former Semipalatinsk nuclear test site in 1998 with charges of 25 tons and 100 tons TNT, have been used for developing travel-time curves and generalized one-dimensional velocity models of the crust and upper mantle of the platform region of Kazakhstan. The explosions were recorded by a number of digital seismic stations, located in Kazakhstan at distances ranging from 0 to 720?km. The travel-time tables developed in this paper cover the phases P, Pn, Pg, S, Sn, Lg in a range of 0–740?km and the velocity models apply to the crust down to 44?km depth and to the mantle down to 120?km. A comparison of the compiled travel-time tables with existing travel-time tables of CSE and IASPEI91 is presented.  相似文献   

Sediment Balance in the Danube River Mouth     

Mikhailova  M. V.  Levashova  E. A. 《Water Resources》2001,28(2):180-184

The sediment balance in the mouth of the Kiliya Branch was analyzed on the basis of new data on the Danube sediment runoff and its distribution among branches. Through the comparison of variations in the fan volume in the branch mouth with the sediment runoff of this branch it was found that the sediment runoff data were underestimated, because they did not take into account the tractional load. The introduction of an appropriate correction made it possible not only to assess the sediment balance components for the Kiliya Branch mouth, but also to specify average long-term values of sediment runoff of the Danube River proper.  相似文献   

Hydrological regime of the Rhône Delta and dynamics of its coastline     

M. V. Mikhailova  M. V. Isupova 《Water Resources》2006,33(6):595-607

Specific features of the hydrological regime of the Rhône River and the nearshore zone of its mouth are discussed. The processes of seawater intrusion into the delta branches are described. The information on the history of the delta evolution and development is presented along with the reconstruction of the Holocene evolution of the Rhône Delta and analysis of formation peculiarities of the present-day delta. Channel processes in the Rhône Delta and the dynamics of the delta coastline are described; characteristics of the deep-water fan are discussed, and the data on sediment balance are given.  相似文献   

Sediment balance at river mouths and the formation of deltas at rising or falling sea level     

M. V. Mikhailova 《Water Resources》2006,33(5):523-534

Sediment balance at river mouths—a physical basis of delta dynamics—is considered. The specific features of relationships between sediment balance components at a mouth of a river are established for a stable, rising, or dropping sea level. The development of the delta of the Chilia branch at the Danube mouth is considered as an example of delta dynamics under the conditions of a relatively stable sea level. The evolution of the Sulak delta in the Caspian Sea with a highly variable level is considered as an example of delta dynamics in the case of a considerable rise and drop of water level in the water body. The anthropogenic reduction of sediment runoff of the rivers (by a factor of two in the Danube, and by a factor of nine in the Sulak) is taken into account. The relationship between the sediment runoff of a river and the volume of the “backwater prism” that formed due to sea level rise is shown to be the key factor in the development of delta in the case of sea level rise. In the case of a drop in the sea level, the relationship between the “active” and “passive” progradation of the delta into the sea is determined by the sediment runoff of the river, the rate of sea level drop, and the bed slope in the coastal area of the nearshore zone.  相似文献   

Geographic-Hydrological Register of Deltas of Main World Rivers     

Isupova  M. V.  Mikhailova  M. V.  Dolgopolova  E. N. 《Water Resources》2022,49(5):927-940

Water Resources - River deltas which are among the most variable and vulnerable geographic objects may be considered as effective indicators of large-scale global and regional, natural and...  相似文献   

Current Scientific and Applied Problems of River Mouth Hydrology     

Mikhailova  M. V. 《Water Resources》2022,49(5):753-765

Water Resources - The current state, the hydrological problems of river mouths, and the history of their studies as specific geographic objects are discussed, and the main lines and schools of...  相似文献   

Sergeysmirnovite,MgZn2(PO4)2 · 4H2O,a New Mineral from the Kester Deposit (Sakha-Yakutia,Russia)     

Yakovenchuk  V. N.  Pakhomovsky  Y. A.  Konopleva  N. G.  Panikorovskii  T. L.  Bazai  A. V.  Mikhailova  J. A.  Bocharov  V. N.  Krivovichev  S. V. 《Doklady Earth Sciences》2022,505(2):549-552

Doklady Earth Sciences - Sergeysmirnovite, MgZn2(PO4)2 · 4H2O, is a new mineral from the oxidation zone of the Kester mineral deposit, Sakha-Yakutia, Russia. This mineral forms...  相似文献   

Typochemistry of rinkite and products of its alteration in the Khibiny Alkaline pluton,Kola Peninsula     

N. G. Konopleva  G. Yu. Ivanyuk  Ya. A. Pakhomovsky  V. N. Yakovenchuk  Yu. A. Mikhailova  E. A. Selivanova 《Geology of Ore Deposits》2015,57(7):614-625

The occurrence, morphology, and composition of rinkite are considered against the background of zoning in the Khibiny pluton. Accessory rinkite is mostly characteristic of foyaite in the outer part of pluton, occurs somewhat less frequently in foyaite and rischorrite in the central part of pluton, even more sparsely in foidolites and apatite–nepheline rocks, and sporadically in fenitized xenoliths of the Lovozero Formation. The largest, up to economic, accumulations of rinkite are related to the pegmatite and hydrothermal veins, which occur in nepheline syenite on both sides of the Main foidolite ring. The composition of rinkite varies throughout the pluton. The Ca, Na, and F contents in accessory rinkite and amorphous products of its alteration progressively increase from foyaite and fenitized basalt of the Lovozero Formation to foidolite, rischorrite, apatite–nepheline rocks, and pegmatite–hydrothermal veins.  相似文献   

Pine needles as a biomonitor for estimation of the regional-scale distribution of organic pollutants     

A. G. Gorshkov  T. A. Mikhailova  N. S. Berezhnaya  A. L. Vereshchagin 《Doklady Earth Sciences》2006,408(4):599-601

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Dynamics of the Interstellar Gas in the Vicinity of a Bar     

V.V. Levy  E.A. Mikhailova  V.V. Mustsevoy 《Astrophysics and Space Science》1997,252(1-2):301-308

A numerical simulation of the disk dynamics of a flat stellar-gaseous galaxy is presented. This simulation is based on N-body modelling for a stellar disk, together with integration of the two-dimensional hydrodynamic equations for a gaseous disk. The existence of a quasi-periodic regime of disk evolution found earlier in a purely hydrodynamic simulation is confirmed. Intense gas flows in the central area of the disk due to the saddle point of the bar potential can support the active galactic nuclei in Seyfert galaxies and form double nuclei.  相似文献