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  • 1
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    The earth's equatorial principal axes and moments of inertia (1991)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The earth's equatorial principal moments of inertia are given as A and B, where A is less than B, and the corresponding principal axes are given as a and b. Explicit formulas are derived for determining the orientation of a and b axes and the difference B - A using C(22) and S(22), the two gravitational harmonic coefficients of degree 2 and order 2. For the earth, the a axis lies along the (14.93 deg W, 165.07 deg E) diameter, and the b axis lies perpendicular to it along the (75.07 deg E, 104.93 deg W) diameter. The difference B - A is 7.260 x 10 to the -6th MR2. These quantities for other planets are contrasted, and geophysical implications are discussed.
    Keywords: GEOPHYSICS
    Type: Geophysical Journal International (ISSN 0955-419X); 106; 699-702
    Format: text
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  • 2
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    Libration in the earth's rotation (1991)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: External luni-solar torque exerted on the difference (B-A) of the earth's two equatorial principal moments of inertia gives rise to two types of librational motions in the earth's rotation: the semidiurnal libration in spin and the prograde diurnal libration in polar motion. Formulas for the librations considering a realistic earth model and their tidal decompositions are derived and evaluated. The spin libration has a maximum peal-to-peak amplitude of 0.90 milliarcseconds, that of the polar libration is 0.06 milliarcseconds. Implications concerning their detectability and role in the tidal variation of earth rotation are discussed.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 18; 2007-201
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  • 3
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    Convection pattern and stress system under the African plate (1977)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Studies on tectonic forces from satellite-derived gravity data have revealed a subcrustal stress system which provides a unifying mechanism for uplift, depression, rifting, plate motion and ore formation in Africa. The subcrustal stresses are due to mantle convection. Seismicity, volcanicity and kimberlite magmatism in Africa and the development of the African tectonic and magnetic features are explained in terms of this single stress system. The tensional stress fields in the crust exerted by the upwelling mantle flows are shown to be regions of structural kinship characterized by major concentration of mineral deposits. It is probable that the space techniques are capable of detecting and determining the tectonic forces in the crust of Africa.
    Keywords: GEOPHYSICS
    Type: Physics of the Earth and Planetary Interiors; 15; 1, Se; Sept
    Format: text
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  • 4
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    Mantle convection pattern and subcrustal stress field under Asia (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Satellite tracking and surface gravity data are used to model the subcrustal stress fields in the terrestrial mantle beneath Asia; the results permit interpretation of the tectonic and seismic systems in China. The east and west China blocks, together with five seismic zones, are identified and related to metallogenic domains on the Chinese mainland. In addition, it is shown that the subcrustal stresses beneath China are arranged perpendicularly to the major fault systems and seismic belts. Stress calculations indicate a notable zone of compression in north China, associated with the Shansi Graben, the Linfen Basin Systems and, possibly, the high seismicity of the region.
    Keywords: GEOPHYSICS
    Type: Physics of the Earth and Planetary Interiors; 16; 3, Ap; Apr. 197
    Format: text
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