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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 99 (1972), S. 12-16 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The effect of secular sea level variations on coastal levelling nets was considered for some parts of the North West European Lowlands levelling. On neglecting local geological influences a simplified global model was used for treating the following problems: (1) Magnitude of secular tilt effects in NWELL due to possible sea level variations; (2) Levelling errors due to sea tide loadings.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 56 (1963), S. 1-15 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Summary A comparison of the tilts excited by tidal forces on the surface of the earth and the theoretical tilts of an elastic earth shows that the difference of both, called the residual movements, represent a caracteristic local deformation of the corresponding observation station. By subtracting the influence of ocean tides from these residuals remain the special local deformations of the earth crust by direct tidal attraction forces. The results of the observations of different stations in Europe and Asia indicate a good agreement between those residuals and the tectonic structure of the crust.
    Notes: Zusammenfassung Vergleicht man die infolge der Gezeitenkräfte an der Erdoberfläche auftretenden Neigungen mit den theoretisch für eine elastische Erde zu erwartenden Deformationen, so zeigt sich, daß die Differenz aus beiden — die sogenannte Residualbewegung — die für die jeweilige Gezeitenstation charakteristische Eigenbewegung darstellt. Sie enthält als wesentlichen Anteil die ozeanischen Wirkungen. Subtrahiert man daher von den Residualbewegungen diese maritimen Gezeiteneinflüsse, so ergeben sich die infolge der lunisolaren Attraktionskräfte auftretenden lokalen Verbiegungen der Erdkruste. Ein Vergleich der in europäischen und asiatischen Horizontalpendelstationen gemessenen Deformationen deutet außerdem auf einen engen Zusammenhang zwischen Residualbewegungen und Tektonik hin.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of geodesy 70 (1996), S. 622-632 
    ISSN: 1432-1394
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Summary The domain of the possible values of the mantle's anelasticity parameters and Love numbers based on modern VLBI-data is found. A new method of the joint analysis of VLBI- and tidal data is suggested, which gives possibility to obtain better estimations of the Q-factor of the free core nutation.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of geodesy 72 (1998), S. 385-403 
    ISSN: 1432-1394
    Keywords: Key words. Nutation ; Earth rotation ; Liquid core
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract. As shown in previous work, dynamical effects of a realistic model of a heterogeneous, compressible, stably stratified liquid core may be obtained by means of a simple analysis of the generalized two-dimensional Laplace tidal equation which describes tidal flows of an incompressible and non-gravitating fluid in a thin spherical layer with mobile boundaries. The solution was presented in the form of expansions in powers of a small parameter κ being the ratio of nutational motion frequency in space to the frequency of the Earth's diurnal rotation. Whereas in an earlier paper only first-order terms were taken into account, our present approach includes not only main second-order terms in the spherical harmonic expansions of the solutions, but also the terms of higher orders. These effects are calculated numerically for realistic models of the Earth's outer liquid core, solid inner core and anelastic mantle (PREM model). All tables are found in electronic version at http://www.tu-darmstadt.de/fb/vw/ipg/Welcome2.html
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 99 (1972), S. 5-11 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Whereas observations of planets and solar satellites are more promising for detecting possible variations of Newtonian gravitational constant,G, with time the application of additional methods which are substantially different might be useful. It is discussed to what extent the tidal problems can be solved in connection with lunar orbit tracking for detectingG; further a relativeG-experiment at the earth surface is outlined.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of geodesy 70 (1996), S. 603-621 
    ISSN: 1432-1394
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Summary "Pathological oscillations" of rotating fluids occur when the period of oscillations with respect to a mobile reference frame exceeds half of a rotational period. The oscillations of such kind play an important role in the theory of nutation of a real Earth model with compressible, heterogeneous outer liquid core and solid inner core. In this paper we try to present a sufficiently rigorous description of such oscillations. The full system of two-dimensional solutions is found numerically. Results are presented in form of infinite matrices which connect the coefficients of spherical harmonic expansions of the boundary conditions, pressure, and horizontal components of tidal velocities. The substitution of these known solutions in the three-dimensional equations of motion results in an infinite set of ordinary differential equations which describe the conditions of equilibrium in the radial direction. Below we analize"pathological" oscillations of different kind which are described by this set of equations.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of geodesy 70 (1996), S. 603-621 
    ISSN: 1432-1394
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Summary. "Pathological oscillations" of rotating fluids occur when the period of oscillations with respect to a mobile reference frame exceeds half of a rotational period. The oscillations of such kind play an important role in the theory of nutation of a real Earth model with compressible, heterogeneous outer liquid core and solid inner core. In this paper we try to present a sufficiently rigorous description of such oscillations. The full system of two-dimensional solutions is found numerically. Results are presented in form of infinite matrices which connect the coefficients of spherical harmonic expansions of the boundary conditions, pressure, and horizontal components of tidal velocities. The substitution of these known solutions in the three-dimensional equations of motion results in an infinite set of ordinary differential equations which describe the conditions of equilibrium in the radial direction. Below we analize "pathological" oscillations of different kind which are described by this set of equations.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of geodesy 70 (1996), S. 622-632 
    ISSN: 1432-1394
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Summary. The domain of the possible values of the mantle's anelasticity parameters and Love numbers based on modern VLBI-data is found. A new method of the joint analysis of VLBI- and tidal data is suggested, which gives possibility to obtain better estimations of the Q-factor of the free core nutation.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    General relativity and gravitation 24 (1992), S. 719-727 
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper, using a quasi-isotropic from the Kerr metric, we have deduced the equations of motion of a neutral test particle in the gravitational field of a spherical homogeneous rotating body. The perturbation equations of the particle's orbit have also been derived.
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  • 10
    ISSN: 1573-0956
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The cause- or causes-of the excitation of the Chandler wobble is one of the most intriguing problems in geophysics. As a result of one of the most valuable examples of an international programme, the positions of the pole have been determined since the late 19th century with remarkable accuracy. These data have always been accepted as of great importance in the study of the atmosphere, oceans and solid Earth. Recently, new techniques have greatly improved the accuracy with which the polar motion can be determined. Interpretation of the older data was made much more difficult because of their errors-for example the interesting suggestion that earthquakes were a cause of the excitation (by D. E. Smylie and L. Manshinha) could not be tested because their effects, if any, were lost in the noise. With the great improvement in the data it is now possible to suppose that comparable advances will be made in the theoretical interpretation. A discussion meeting at the Royal Astronomical Society on 8 May, 1987 on this topic was held and the following gives a short survey of this topic, consisting of brief summaries given by the speakers. This review is therefore a collective one which it is hoped will make more widely known these great technical advances and to fundamental interest of the phenomena of thepolar motion.
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