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61.
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Analysis of sea current velocities showed that the principal flow has a southeastern horizontal direction and downward vertical direction. This flow pattern persisted throughout the observational period. Abrupt temperature drops and water salinity rises are indicative of the near-shore upwelling that was recorded twice during this period. A steady tendency toward a decrease in oxygen concentration and an increase in pH was observed during the observations. 相似文献
63.
The paper presents a comparative analysis of the intrinsic noises of seismometers operating at Kamchatka seismic stations: CMG-3TB (GURALP), CMG-5TD (GURALP), CMG-6TD (GURALP), GMS-AC-73i HHV (GeoSIG), SM3os (GEOTECH+), S5Sos (KF GS), and SM3kv. It is shown that the dynamic range of the seismometers is narrower at low frequencies in the area of weak signals. 相似文献
64.
Shevchenko V. I. Lukk A. A. Leonova V. G. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(11):1337-1345
Izvestiya, Atmospheric and Oceanic Physics - Based on the available geological and geodetic data, it has been established that the structures of the Alpine–Himalayan–Indonesian mobile... 相似文献
65.
S. G. Skolotnev N. N. Turko S. Yu. Sokolov A. A. Peyve N. V. Tsukanov S. Yu. Kolodyazhnyi N. P. Chamov Yu. E. Baramykov A. S. Ponomarev V. N. Efimov A. E. Eskin V. V. Petrova L. A. Golovina V. Yu. Lavrushin E. A. Letyagina E. P. Shevchenko K. V. Krivosheya L. V. Zotov 《Doklady Earth Sciences》2007,416(1):1037-1041
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A. G. Gubanov O. A. Bogatikov B. S. Karamurzov L. E. Tsukanova A. B. Leksin V. M. Gazeev A. V. Mokhov T. A. Gornostaeva A. V. Zharikov V. M. Shmonov A. Ya. Dokuchaev S. A. Gorbacheva A. V. Shevchenko 《Journal of Volcanology and Seismology》2011,5(4):223-240
In addition to traditional degassing of the melt in the subsurface magma chambers of the “dormant” El’brus volcano, alsodegassing through pores and microcracks that occur in the top of magma chambers has also been detected. It is proven by studies of compactness, porosity, and permeability of the rocks. The speeds at which gases (H, He, H2S, CO2, F, and Cl) pass through gneiss and volcanic rocks were estimated. Magma chambers on the ground surface are expressed in stable thermal anomalies revealed by night-time thermal sounding from an NOAA satellite. The presence of magma chambers at depths of 2–12 km was proven by magnetotelluric sounding [Sobisevich et al., 2003] and gravity studies. In addition to occasional “columns” of bright-white fluorescence above the thermal anomalies, aerosol “clouds” and hydrogen flows were detected by lidar and hydrogen surveying [Alekseev et al., 2007, 2009]. Observation at the same sites detected steam outbursts occurring periodically, the snow-ice cover thaws and the smell of hydrogen sulfide is felt. Geochemical characteristics of degassing were studied by snow sampling from up to 1 m deep pits. They were taken within contours of the thermal anomalies, above active fault zones, in the sites of bright-white fluorescence “columns,” and on a new fumarole locality. It is shown that the degassing of melt was accompanied by the gas transporting many elements (Li, B, Si, P, S, Ca, Zn, Pb, Mo, Ba, W, Hg, Ag, U, Th, I, Au, and Pt) in a fine-grained state (a few microns or possibly nanometers) with an active participation of F and Cl. Native platinum, chalcopyrite, halite, sylvite, barite, gypsum, zircon, opal, chlorinated organics, etc. were for the first time discovered in the Mt. El’brus area using electron microscope studies of solid residue from dehydrated snow samples. “Hidden” ore mineralization genetically related to degassing of melts enriched in ore elements may be supposedly found in paleo- and present-day areas of volcanic activity. 相似文献
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Shevchenko G. V. Ivel’skaya T. N. Kovalev P. D. Kovalev D. P. Kurkin A. A. Levin B. V. Likhacheva O. N. Chernov A. G. Shishkin A. A. 《Doklady Earth Sciences》2011,438(2):893-898
Doklady Earth Sciences - 相似文献
69.
A. F. Sazhin F. V. Sapozhnikov T. N. Rat’kova N. D. Romanova V. P. Shevchenko A. S. Filippov 《Oceanology》2011,51(2):295-305
The data on the supra-ice snow, ice, under-ice water, and benthic algal flora obtained in 2007–2008 by sampling in the estuary
of the Severnaya Dvina River are analyzed. The river ice and under-ice water in the estuarine zone and in the channel part
of the Severnaya Dvina differed greatly in the algal flora’s composition. The fresh water species never exceeded 8.6%, while
the ice algae composed 90–96% of the total ice inhabitants’ biomass. In the under-ice water, this value did not exceed 58–64%.
The bacteria in the ice composed not more than 2.5–10% of the total biomass, while, in the under-ice water, 36–49%. The shares
of ciliates (0.04%) and nematodes (0.005–1.6%) in the total biomass were negligible. In the estuarine zone, the ice was inhabited
mainly by nematodes (78% of the total biomass), while, in the river, their share decreased to 9%. The contribution of bacteria
was 15% in Dvina Bay and increased to 61% in the river. The importance of algae in the snow was minor: 7% of the total biomass
in the marine zone and 30% in the river region. High species diversity of the algal flora in the sandy and sandy-silty littoral
grounds was revealed. The values of the total biomass of the bottom algal flora (0.38 g C/m2) were only two to three times lower than the values revealed in similar habitats in the summer. The epipelithic forms (0.15
g C/m2) dominated, being represented by 46 species of algae (49%). The shares of epipsammonic (0.12 g C/m2) and planktonic (0.11 g C/m2) species were almost equal to each other: 25 and 22 species, respectively (27 and 24%). 相似文献
70.