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54481. Seismic Tomography
... Seismic tomography (ST) is a means of making a picture of a slice of the earth using seismic data. ... Attempts to reproduce the observed seismograms using the average earth structure and the seismic source led them to progress from one to three dimensions. ... In particular, ST is being successfully used to provide structural velocity models, rock attenuation models, more accurate depth migrations, calibrated seismic inversion sections, high-resolution crosswell pictures, and 3-D Earth images. ...
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Ссылки http://geo.web.ru/sbmg/sbor/tomography/Harvard/tomo.htm -- 18.9 Кб -- 25.03.1999
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54482. Global Seismic Tomography
Global Seismic Tomography Revisited: . Slabs Subducted or Columns Raised . ... Upon recognizing ocean floor spreading, scientists who work on that "graveyard" solve the problem, of getting excess ocean floor, by way of postulating (1) convection currents in the mantle, (2) subduction of ocean floor crust down into the mantle, and (3) underthrusting continental crusts with cooled ocean floor slabs, so as to heave up mountain ranges along the continental peripheries. ...
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Ссылки http://geo.web.ru/sbmg/sbor/tomography/Luckert.htm -- 15.5 Кб -- 25.03.1999
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54483. Seismic tomography of central Eurasia
Seismic tomography is the most powerful instrument for determination of 3D structure of deep Earth's interiors. Tomographic models obtained at the global and regional scales serve as the basis for determination of geodynamical state of the Earth. ... But most of the Earth's territory is not yet studied satisfactorily. ... However this tomographic model was obtained in condition of very poor data, when the level of noise was higher than the relevant residuals. ... Reconstruction with noised data. ...
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Ссылки http://geo.web.ru/sbmg/sbor/tomography/Regional/Kulakov/ris.html -- 18.4 Кб -- 25.03.1999
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54484. Harvard Seismology: 3-D Earth Structure
The first major global tomographic study was made by Professor Dziewonski in early 70's. The idea of this study was that the travel time anomalies observed for many ray paths, criss-crossing the Earth between various points near the Earth's surface and reaching different depths in its interior, could be resolved formally into a three-dimensional (3-D) model. ... How to use Harvard's 3-D Earth models? Now, you can download source codes in order to use Harvard's recent Earth models. ...
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Ссылки http://geo.web.ru/sbmg/sbor/tomography/Harvard/harvard.html -- 9.5 Кб -- 25.03.1999
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54485. Tomographic Models
Several models of the P- and S-wave velocities have been published during the last four years. ... Ekstr?m and Dziewonski [1994 ] developed a degree-20 S -velocity model with an enhanced resolution in the upper mantle, needed to satisfy the short-period surface wave data ( 35 s) together with the mantle wave and body wave waveforms and differential and absolute travel times. ... The two models are compared in Dziewonski et al. [1993 ] and Woodward et al. 1994 ]. ... 1993 ; Romanowicz, 1994 ]. ...
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Ссылки http://geo.web.ru/sbmg/sbor/tomography/Dziewonski/node4.html -- 12.9 Кб -- 25.03.1999
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54486. Spectrum of Heterogeneity
... In studies such as those of Dziewonski [1984 ], Woodhouse and Dziewonski [1984 ] or Tanimoto [1990 ] it was assumed a priori that the lateral variations in the structure could be represented by a spherical harmonic expansion truncated at some low degree such as 6 or 8. ... A very similar spectrum (up do degree 8) is obtained by predicting the SS data from 3-D models such as an upper mantle model M84C [ Woodhouse and Dziewonski, 1984 ]. ... U.S. National Report to IUGG, 1991-1994 . ...
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Ссылки http://geo.web.ru/sbmg/sbor/tomography/Dziewonski/node3.html -- 3.9 Кб -- 25.03.1999
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54487. References
... Durek, J. J., M. H. Ritzwoller, and J. H. Woodhouse, Constraining upper mantle anelasticity using surface wave amplitude anomalies, Geophys. ... Dziewonski, A.M., Mapping the lower mantle: Determination of lateral heterogeneity in P velocity up to degree and order 6, J. Geophys. Res. ... Dziewonski, A. M., A. M. Forte, W.-J. Su, and R. L. Woodward, Seismic tomography and geodynamics, in Relating Geophysical Structures and Processes: The Jeffreys Volume , K. Aki and R. Dmowska, eds., AGU Geophys. ...
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Ссылки http://geo.web.ru/sbmg/sbor/tomography/Dziewonski/node5.html -- 13.9 Кб -- 25.03.1999
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54488. New Data Sets
Woodward and Masters [1991a ] measured the arrival times of the SS -wave, a downward radiated shear wave reflected once at the earth's surface, roughly at the mid-point of its path between the source and receiver, and subtracted from it the travel time of the direct shear wave ( S ). This difference is called a ``differential travel time'' and is relatively insensitive to the structure near the source and the receiver as well as the origin time of the earthquake and its geographic location. ...
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Ссылки http://geo.web.ru/sbmg/sbor/tomography/Dziewonski/node2.html -- 5.0 Кб -- 25.03.1999
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54489. Dziewonsky: Global seismic tomography of the mantle
. Adam M. Dziewonski . Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts . New Data Sets . Spectrum of Heterogeneity . Tomographic Models . References . U.S. National Report to IUGG, 1991-1994 . Rev. Geophys. Vol. 33 Suppl., ї 1995 American Geophysical Union
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Ссылки http://geo.web.ru/sbmg/sbor/tomography/Dziewonski/dziewo01.html -- 1.8 Кб -- 25.03.1999
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54490. Minarik: Earth Core Studies
... So it is with discoveries about the Earth's core and mantle. ... Using the larger of Livermore's two multi-anvil presses to mimic the pressures and temperatures that exist deep in the Earth, he has shown that metals like those in the Earth's core could not have trickled down (see figure below). ... Together, these experiments indicate that much higher temperatures were required to separate the Earth's core and mantle--temperatures high enough to melt most of the Earth. ... W. G. Minarik, et al., ...
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Ссылки http://geo.web.ru/sbmg/sbor/tomography/Minarik/Minarik.html -- 9.1 Кб -- 25.03.1999
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54491. Реконструкции Скотиза
650 Ma Vendian, late Proterozoic . 514 Ma Late Cambrian . 458 Ma Middle Ordovician . 425 Ma Middle Silurian . 390 Ma Early Devonian . 306 Ma Late Carboniferous . ... 195 Ma Early Jurassic . 152 Ma Late Jurassic . 94 Ma Early Cretaceous . 69.4 Ma Late Cretaceous . ... 50 Ma Future . ... Там они лежат с разрешения PALEOMAP PROJECT. ... Paleogeographic Atlas, PALEOMAP Progress Report 90-0497, Department of Geology, University of Texas at Arlington, Arlington, Texas, 45 pp. ...
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Ссылки http://geo.web.ru/sbmg/sbor/scotese/mapsnf.htm -- 4.1 Кб -- 24.03.1999
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54492. Seismic Tomography
Douglas Toomey, Janice Cuny, Allen Malony, Christopher Harrop and Robert Dunn . ... To further understand the pivotal role mid-ocean ridge magma chambers play in the chemistry of the oceans and the formation of two-thirds of the planet's surface, marine geophysicists are using tomographic methods to image three- dimensional variations in physical properties kilometers beneath the seafloor (seismic tomography is similar in concept to CAT-scan imaging used in medical applications.) ...
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Ссылки http://geo.web.ru/sbmg/sbor/tomography/Toomey/toomo.html -- 4.7 Кб -- 04.02.1999
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54493. Global Seismic Tomography: A Snapshot of Convection in the Earth
Global Seismic Tomography: . A Snapshot of Convection in the Earth . ... The heat of the Earth's formation has been slowly released through the course of its 4.5 Ga history by mantle convection and conduction at the surface. It is important that we study the nature of this convective flow in order to understand the thermal history of the Earth, its internal composition, and the forces that drive plate motions. ... Global Seismic Tomography Revisited - Grand's results are challenged . ...
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Ссылки http://geo.web.ru/sbmg/sbor/tomography/Grand/grand.html -- 6.1 Кб -- 04.02.1999
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54494. Структура кафедры
. Структура кафедры . На кафедре есть следующие подразделения: . - Лаборатория геологии и моделирования осадочных бассейнов; . - Лаборатория геологии складчатых поясов; . - Кабинет фотогеологии; . - Кабинет четвертичной геологии; . - Кабинет геологической карты; . - Уральская геологическая экспедиция . Информация на данной странице будет добавлена в ближайшее время.
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Ссылки http://geo.web.ru/sbmg/struct.html -- 2.0 Кб -- 30.01.1999
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