A viscoelastic damage model with applications to stable and unstable fracturing     

Yariv Hamiel  Yunfeng Liu  Vladimir Lyakhovsky  Yehuda Ben-Zion  David Lockner 《Geophysical Journal International》2004,159(3):1155-1165

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Environmental fluxes of arsenic from lignite mining and power generation in northern Thailand   总被引：3，自引：0，他引：3  

Vladimir N. Bashkin  Kanitta Wongyai 《Environmental Geology》2002,41(8):883-888

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Heat flow in the Upper Silesian coal basin     

Čermák  Vladimir 《Pure and Applied Geophysics》1968,69(1):119-130

Summary The paper presents results of heat flow measurements made in 6 deep bores in the Czechoslovakian part of the Upper Silesian coal basin. The heat flow measured was in the range from 1.74 to 1.87 cal/cm²s. The undisturbed period before the temperature measurement in the bore is discussed and results of repeated temperature measurements carried out 0.1, 1,5 and 36 days after cessation of drilling in one of the bores NP-522, are also given. Although the temperature in the bore still differs considerably from equilibrium, it is possible to determine the temperature gradient with an accuracy better than 5% as soon as 5 days after drilling was finished.  相似文献   

Anisotropy and non-linear polarization of body waves in exponentially heterogeneous media     

Vladimir Y. Grechka  George A. McMechan 《Geophysical Journal International》1995,123(3):959-965

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Empirical-Statistical Methodology and Methods for Modeling and Forecasting of Climate Variability of Different Temporal Scales     

Vladimir A. Lobanov 《大气科学进展》2001,18(5):844-863

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Paleomagnetism of Cretaceous units of the Mametchinskiy Peninsula, Kuyul Region, Northeastern Russia: implications for development and evolution of the Northwest Pacific Basin     

William Harbert  Maxim Alexutin  Sergei Sokolov  Kirill Krylov  Vladimir Grigoriev  Alexander Heiphetz  Robert Graham 《Tectonophysics》2001,340(3-4):215-231

The northernmost part of the Kamchatka Peninsula of northeastern Russia, located along the northwestern margin of the Bering Sea, consists of zones of complexly deformed accreted terranes. Progressing from the northwestern Bering Sea inland are the Olyutorskiy, Ukelayat, and Koryak superterranes, which were accreted to the Okhotsk–Chukotsk volcanic–plutonic belt (OChVB) during the Campanian–Maastrichtian (Koryak) to Middle Eocene (Olyutorskiy), respectively. To constrain the accretion paleolatitude of the Koryak superterrane, we paleomagnetically sampled a sedimentary series on the Mametchinskiy Peninsula. At the Mametchinskiy Peninsula, in the northeastern Penzhinskaya Guba (61.45° N, 163.75° E), a gently deformed, well-bedded section of fine-grained Lower to lower Upper Cretaceous turbidites, the Mametchinskaya and Tylakrylskaya Formations are exposed. These strata, which represent the lower part of the sedimentary cover of the terranes in this region and the forearc of OChVB, were sampled at 39 sites (three to seven samples per site). Within the Ainyn terrane, more than 1000 m of section of Cenomanian–Turonian age was sampled at a basal locality (sample groups I and II, sites 1–18, 19–29) and at an upper locality of Valanginian–Barremian age (sample group III, sites 30–39) along the western shore of the Peninsula. Thermal demagnetization and principal component analysis of the demagnetization data show lower-temperature (A) and higher-temperature (B) magnetic components. Although group III samples did not display a coherent A component, the A component of group I and II samples was observed as a single-polarity lower-unblocking temperature component generally removed by 100–400 °C. This component failed the fold test at the 95% confidence level. With respect to direction, the A component is similar to both the present-day field and axial–geocentric dipole directions expected at this site. The B component was observed during thermal demagnetization steps up to 580 °C and was always of downward-directed inclination. Coherence of bedding corrections within each section do not allow statistically meaningful fold tests within groups I, II or III. Assuming the B component represents a Cretaceous magnetization, two overall models are proposed. In the first model (preferred), with the highest clustering of directions (k-value=36.7, N (sites)=36), indicates significant poleward motion of the Ainyn terrane (observed paleolatitude λ_M1=61.0±6.5°; expected North America plate reference site paleolatitude λ_E=74.0±3.5°). In the second model, no significant poleward displacement is implied (λ_M2=72.0±9.6).  相似文献   

Magnetostratigraphy of the Moyero River Section (North-Western Siberia): Constraints On Geomagnetic Reversal Frequency During the Early Palaeozoic   总被引：1，自引：0，他引：1  

Yves Gallet  Vladimir Pavlov 《Geophysical Journal International》1996,125(1):95-105

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The new state of Slovenia and its function within the frame of Europe     

Vladimir Klemenčič  Rado Genorio 《GeoJournal》1993,30(3):323-333

The paper discusses minorities and their problems along borders of post-WWII Europe and of nation states formed in the early 1990's. One focuses on the socio-geographic conditions of the territory settled by minorities. These territories are most often peripheral, less developed areas of the state and are, because of the constant ignorance of the local culture and language, conflict regions, where interests of the minority and majority population of the state, as well as of the neighboring countries clash. Finally, an attempt of a cross-cultural comparison is undertaken to distinguish among major elements of the minority (protection) arrangements of the Alpen-Adria region and of the areas along the long-time closed borders of Central Europe.  相似文献   

Stress distribution over the Mozambique Ridge     

Vladimir Lyakhovsky  Zvi Ben-Avraham  Margaret Reznikov 《Tectonophysics》1994,240(1-4):21-27

The Mozambique Ridge is an aseismic oceanic plateau in the southwestern Indian Ocean. During the separation of Antarctica and South Africa in the Early Cretaceous, the Mozambique Ridge was segmented by fracture zones which were assumed to become inactive during the Cenomanian, when Africa and Antarctica were finally separated. However, the existence of active normal faulting in the central part of the Mozambique Ridge was demonstrated by single and multichannel seismic surveys. Numerical modelling of the stress distribution caused by the crustal structure of the Mozambique Ridge and the adjacent oceanic basins suggests the possible existence of a zone with average horizontal tension up to 70 MPa along the central part of this passive ridge, which may cause the modern fault activity. These stresses also cause an additional dynamic anomaly which can explain small variations of the geoid anomaly over the ridge.  相似文献   

Fluid circulation in a complex volcano-tectonic setting,inferred from self-potential and soil CO2 flux surveys: The Santa María–Cerro Quemado–Zunil volcanoes and Xela caldera (Northwestern Guatemala)     

Laura Bennati  Anthony Finizola  James A. Walker  Dina L. Lopez  I. Camilo Higuera-Diaz  Claudia Schütze  Francisco Barahona  Rafael Cartagena  Vladimir Conde  Renan Funes  Cristobal Rios 《Journal of Volcanology and Geothermal Research》2011,199(3-4):216-229

The region encompassing Santa María, Cerro Quemado, and Zunil volcanoes, close to Quetzaltenango, the second largest city of Guatemala, is volcanically and tectonically complex. In addition, the huge Xela caldera, about 20 km in diameter, crosses this area and links up to the important Zunil fault zone located between the three volcanoes. Two highly active geothermal sites, named Zunil-I and Zunil-II, are also located between these three volcanic edifices at the southeastern boundary of Xela caldera. In order to determine the permeability variations and the main structural discontinuities within this complex volcano-tectonic setting, self-potential and soil CO₂ flux measurements have been coupled, with a step of 20 m, along a 16.880 km-long profile crossing the entire area. Two shallow hydrothermal systems, with maximum lateral extensions of 1.5 km in diameter, are indicated by positive self-potential/elevation gradients below Santa María and Cerro Quemado volcanoes. Such small hydrothermal systems cannot explain the intense geothermal manifestations at Zunil-I and Zunil-II. Another minor hydrothermal system is indicated by self-potential measurements on the flank of Santa María along the edge of the Xela caldera. CO₂ flux measurements display slight variations inside the caldera and decreasing values crossing outside the caldera boundary. We hypothesize the presence of a magmatic body, inside the southeastern border of Xela caldera, to explain the deeper and more intense hydrothermal system manifested by the Zunil-I and the Zunil-II geothermal fields. This magmatic system may be independent from Santa María and Cerro Quemado volcanoes. Alternatively, the hypothesized Xela magmatic system could have a common magmatic origin with the Cerro Quemado dome complex, consistent with previous findings on regional gas emissions. Sectors bordering the Cerro Quemado dome complex also have high amplitude minima-short wavelength anomalies in self-potential, interpreted as preferential rain water infiltration along faults of major permeability, probably related with the most recent stages of Cerro Quemado dome growth.  相似文献