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Browsing ELibrary by Title
Now showing items 10280-10299 of 21638
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(2003)The behaviour of seismic shear waves shows that fluid-rock interactions control both low-level deformation of the intact rock mass before fracturing takes place, and the fracturing or faulting process itself in deep in ...
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(1996)A major problem in geodynamics with seismic data is discussed: How deeply do the continents penetrate into the mantle? Differential travel times of underside reflections from mantle discontinuities that appear as precursors ...
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(2001)High resolution, single-channel seismic sparker profiles across the Akademichesky Ridge, an intra-basin structural high in Lake Baikal (Russia), reveal the presence of small sediment mounds and intervening moats in the ...
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(1996)This study is concerned with spatial variations in strain and stress rates and in viscosity, these being macroscopic effective parameters of seismic flow in the crust and upper mantle (down to 60 km depth) beneath Kamchatka. ...
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(1997)A new concept, seismic gyrotropy, is presented in the context of both phenomenological and microlevel theory; comparison with the advanced theory of optical gyrotropy is given. Seismic gyrotropy is introduced as manifestation ...
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(2004)One of the important tools for seismic hazard risk assessment is study of the dynamics of properties of spatio-temporal distribution of the seismicity. We have performed simulation of the crack network development in elastic ...
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(2001)The aim of this paper is to analyse how the scattered wavefield in a highly heterogeneous structure influences the image quality of structures below it and how the velocity control during processing of data from highly ...
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(1999)Discontinuities in physical properties within the continental lithosphere reflect a range of processes that have contributed to craton stabilization and evolution. A survey of recent seismological studies concerning ...
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(2002)Characterization of naturally fractured reservoirs often requires estimating parameters of multiple fracture sets that develop in an anisotropic background. Here, we discuss modeling and inversion of the effective parameters ...
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(2003)During the summer of 1998 a two-ship experiment with the Russian nuclear icebreaker Arktika and RV Polarstern probed the central part of Alpha Ridge in the High Arctic. In total 320 km of multichannel seismic data were ...
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(2004)There is a complex relationship between seismic attributes, including the frequency dependence of reflections and fluid saturation in a reservoir. Observations in both laboratory and field data indicate that reflections ...
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(2002)An accumulation of seismic moment data gathered over the previous decade justifies a new attempt at a comprehensive statistical analysis of these data: herein, more rigourous statistical techniques are introduced, their ...
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(2002)We compare the tectonic rate with earthquake data using several theoretical distributions to approximate the seismic moment–frequency relation. We derive formulae to estimate parameters of the seismic moment distributions ...
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SEISMIC MOMENTS OF EARTHQUAKES IN THE BAIKAL RIFT ZONE AS INDICATORS OF RECENT GEODYNAMIC PROCESSES (2004)The investigation of spatio-temporal variations of seismic moments of earthquakes in the Baikal region shows three considerable episodes of change of the state of stress and strain of the Earth's crust between 1968 and ...
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(1988)Systematic observations of wave-velocity changes in the Earth's crust were carried out in Southern Tadjikistan. Observational data obtained in a period of 7 years of seismic wave fields generated by TNT explosions in two ...
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(1996)In the central segment of the Xiangshui-Mandal Geoscience Transect Archean basement rocks of the North China craton are well exposed. The metamorphic grade of the tilted rock units, which are suggested to represent an ...
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(2005)A recent study of PKiKP / PcP amplitude ratios found surprisingly low values for the change in density (ΔρICB = 0.3 g/cm3) and shear velocity (ΔSICB = 2.0 km/s) across the inner core boundary (ICB). However, because the ...
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(2000)Variations in seismicity are considered in the area of two large Kamchatka earthquakes of June 21 (Mw = 7.0) and July 16, 1996 (Mw = 6.6). Both events were found to have been preceded by seismic quiescences terminating a ...
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(1991)Two calderas have been located in Lake Kurilskoe by seismic reflection profiling. One of them, Kurilskaya, is about 7 km across and occupies the central and southern parts of the lake. The other caldera, Il'inskaya,is ...
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(1996)In many areas of the world, the continental lithospheric upper mantle contains bright, continuous, regionally extensive, seismic reflectors. Despite the increasingly common observation of such mantle reflectors on deep ...
Now showing items 10280-10299 of 21638