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  • Articles  (4,043)
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  • 1937  (4,043)
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  • Articles  (4,043)
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  • 2010-2014
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  • 1980-1984
  • 1935-1939  (4,043)
  • 1930-1934
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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 4 (1937), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 4 (1937), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 4 (1937), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 4 (1937), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 4 (1937), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The basic ideas that support intrinsic geodesy, i. e. the discipline which aims at the local description of the gravity field of the Earth by using only coordinates and quantities that have a physical reality and that are therefore accessible to actual observation, are recalled.It is shown how the integrability conditions necessary for the existence of the coordinate surfaces, and the fundamental operators, e. g. the Christoffel symbols of the second kind connecting the principal trihedra of the intrinsic coordinate system, may be expressed in terms of the curvature parameters of the field, and of gravity.An application of the theory is made to a classical geodetic problem, i. e. the generalized expansion of Legendre for the displacement of the potential (the dynamic height) along an optical path.
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 4 (1937), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A theoretical investigation is made of the changes of the polarization of transverse seismic waves during their propagation through the Earth. The polarizations have been computed theoretically and numerically for reflexion at the core boundary and at the Earth's surface, for refraction and reflexion at the base of the crust and for passages through continuously varying media. It is demonstrated that great changes of the vibration properties (vibration angle and particle orbit) may occur in all cases except for continuously varying media, through which transverse waves propagate with practically unchanged vibration properties. The consequences of these results for earthquake mechanism studies, based on transverse waves, are discussed.
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 4 (1937), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Seismic ray theory is developed ab initio (apart from one or two standard elementary results) with special emphasis on the variables σ and α, where σ=d log σ/d log r and α= 2/(1- σ). Travel-time-distance relations are examined for a variety of types of velocity distribution, including the case α constant and cases where α and σ change discontinuously, or rapidly but continuously, with increase of depth. The analysis is designed to provide an improved basis for working out in quantitative detail the effect on travel-times of the various types of velocity variation likely to be relevant to the Earth. In particular, it is hoped that the analysis will lead to the most effective use of ray theory in the current difficult problems of the structure of the Earth's outer mantle.Advantage has been taken of the opportunity to present a number of previous results involving σ and α in revised form, as part of a wider logical development. Previous work on deriving seismic velocity distributions from travel-time data is generalized.The aim of the paper has been to set down a terse account of the basic theory, and no numerical applications have been included. References are given, however, to papers containing applications.
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 4 (1937), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The palaeomagnetic interpretation of rock magnetism has led to an increasingly elaborate set of geodynamic postulates, which now include polar wandering, continental drift, and the rotation of continents and parts of continents. An alternative approach is suggested by the hypothesis of widespread continual plastic flow of basement rocks. Remanence data for western Europe are analysed from this viewpoint, assuming that the position of the poles has always been virtually the same as at present. The inferred pattern of flow is away from the high standing interior and towards the Northeastern Atlantic Basin. The amcunt of flow increases with the age of the rock; an accelerated rate of flow is indicated during the Hercynian revolution and a relatively slow rate in more recent times. These results are in accord with the concept of continental growth by plastic flow under gravity.
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 4 (1937), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The propagation of Rayleigh waves in the Earth is investigated in the whole range of periods T from about 10s up to one hour. Three methods are necessary in order to cover this range of periods effectively. The standard flat Earth method, with neglect of gravity, gives values for the phase velocity C correct to within I per cent up to T= 50s only, and for the group velocity U up to T= 250s. The method of the flattening of the Earth, with neglect of gravity, has the I per cent accuracy limits for C and U at 300 and 400, respectively. Inclusion of gravity effects in the flattening of the Earth approximation does not alter the above limits. For T 〉 300 (n 〈 25) one must determine the period T(n) of free oscillation of the Earth as a function of the order of the spherical harmonic n. This involves the solution of a system of differential equations of the sixth order, in which the gravitational effects are included. The wave penetrates appreciably into the core already at T= 600. Using the above three methods in their respective ranges of validity, we have evaluated C(T) and U(T) for (I) Bullen's Model B, (2) the Jeffreys-Bullen Model, as modified by Dorman, Ewing and Oliver, and (3) the Gutenberg Model. The observed Rayleigh group velocity data of Ewing and Press for T 〈 380s and the phase velocity data of Nafe and Brune for T 〈 300s agree with the values computed for the Gutenberg model, but not for the other models. This substantiates a previous conclusion reached by Takeuchi, Press and Kobayashi and by Dorman, Ewing and Oliver that the observed Rayleigh wave data provide evidence in support of Gutenberg's lowvelocity layer. The few observed Rayleigh group velocities between T= 400 and 600 are substantially lower than the theoretical values for all the three models.
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 4 (1937), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Type of Medium: Electronic Resource
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