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  • Articles  (4,753)
  • 1950-1954  (3,190)
  • 1945-1949  (1,563)
  • 1952  (3,190)
  • 1947  (1,563)
  • Geosciences  (4,753)
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  • Articles  (4,753)
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Publisher
Years
  • 1950-1954  (3,190)
  • 1945-1949  (1,563)
Year
Journal
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  • 1
    Electronic Resource
    Electronic Resource
    A SUGGESTED EXPLANATION OF THE PRESENT VALUE OF THE VELOCITY OF ROTATION OF THE EARTH (1952)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 6 (1952), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: It is suggested that the coincidence of the period of rotation of the Earth and a natural period of vibration of the atmosphere is not fortuitous but due to the Earth being driven at a constant rate in synchronism with the vibration. An observation by Kelvin that the gravitational couple on the atmospheric tides accelerates the Earth's rotation is recalled, and the production of mechanical energy to balance the dissipation of the oceanic tides is discussed. The astronomical evidence supporting the current view that the rotation is being steadily retarded is reviewed and found to contain contradictions, and it is claimed that the high value of the angular momentum of the Earth-Moon orbit supports the hypothesis of equilibrium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1952.tb03021.x
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  • 2
    Electronic Resource
    Electronic Resource
    ON THE GEOPHYSICAL INTERPRETATION OF IRREGULARITIES IN THE ROTATION OF THE EARTH (1952)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 6 (1952), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Astronomical observations have indicated that variations in the Earth's rotation by several parts per hundred million sometimes occur over periods of one or two decades. These irregularities may be caused by variations in the distribution of matter, or by variable motion relative to the Earth. It is found that processes in the atmosphere and ocean are inadequate to account for all of the observed irregularities, but that their effect is not necessarily negligible. Processes in the crust and mantle could barely do so, but such processes seem highly unlikely for a number of reasons. The irregularities can be accounted for by a variable motion in the core amounting to a fraction of the total motion indicated by the westward drift of the Earth's magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1952.tb03022.x
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  • 3
    Electronic Resource
    Electronic Resource
    GRAVIMETER OBSERVATIONS COMPARING PENDULUM STATIONS AT CAMBRIDGE, YORK, NEWCASTLE-UPON-TYNE, EDINBURGH AND ABERDEEN (1952)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 6 (1952), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: An extensive network of gravimeter stations has been observed by the Geological Survey of Great Britain using a Frost gravimeter. In the course of this survey gravimeter observations were made at recent pendulum stations in York, Newcastle-upon-Tyne, Edinburgh and Aberdeen. At these stations the gravimeter determinations gave values for differences in gravity from Pendulum House, Cambridge, which were consistent with the pendulum observations of Browne, Cook, McCarthy and Parasnis (1950). If the value of gravity at Pendulum House, Cambridge, is assumed to be 981.26500 cm/s2 the values at the other stations are found by combining the pendulum and gravimeter observations as:–York, Minster Crypt 981.41474 cm/s2± 0.00011Newcastle, King's College 981.50608 cm/s2± 0.00012Edinburgh, Royal Observatory 981.58014 cm/s2± 0.00013Aberdeen, Marischal College 981.69597 cm/s2± 0.00014From the observations at these pendulum stations an accurate calibration factor was obtained for the Frost gravimeter and this was found to differ significantly from the calibration factor determined from observations in the tower of Westminster Cathedral. Further measurements at Westminster Cathedral showed that the vertical variation in gravity is not linear but is distorted near the base of the tower, probably due to local terrain effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1952.tb03017.x
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  • 4
    Electronic Resource
    Electronic Resource
    A MEASUREMENT OF THE DIFFERENCE OF GRAVITY BETWEEN THE NATIONAL PHYSICAL LABORATORY, TEDDINGTON AND THE ORDNANCE SURVEY OFFICE, SOUTHAMPTON (1952)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 6 (1952), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Using the Cambridge pendulum apparatus the value of gravity at the National Physical Laboratory has been found to be 69.90 ± 0.16 mgal greater than that at the Ordnance Survey Office, Southampton. The result of a measurement with a Worden gravimeter was 70.36 mgal, and other indirect gravimeter measurements are in satisfactory agreement with the pendulum result.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1952.tb03019.x
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  • 5
    Electronic Resource
    Electronic Resource
    ON THE BURTON-ON-TRENT EXPLOSION OF 1944 NOVEMBER 27 (1947)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 5 (1947), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Seismic waves from the Burton-on-Trent explosion of 1944 November 27 were recorded at four British and six continental stations. The five observations of Pn suggest that the times of Pn about distance 8° for a surface focus are 3s.9+.3 shorter than those given in my 1940 table. The anomaly cannot be explained by any permissible reduction of the thicknesses of the upper layers. It seems just possible that it might be explained by an increase of the velocity of Pn at short distances, but further investigation is needed before this explanation can be adopted. Sg was satisfactorily recorded, and it is likely that the low velocity of Sg found in the Oppau explosion was not due to misidentification, but to ordinary errors of observation.The energy of the explosion and that of the ground movement were in about the same ratio as in the Oppau explosion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1947.tb00345.x
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  • 6
    Electronic Resource
    Electronic Resource
    SEISMIC WAVES IN WESTERN AND CENTRAL EUROPE (1947)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 5 (1947), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: An examination of six near earthquakes in Western and Central Europe indicates that the velocity of P in this region is somewhat higher than in Southern Europe and Japan, the difference in dt/dΔ being about os.5/1°. The agreement found in a previous comparison is attributed to a possibility that P in the Tauern earthquake was read late owing to weakness. Apart from the Tauern earthquake the earthquakes used in previous discussions are consistent with the existence of the difference. The results are consistent with the observations of the Burton-on-Trent explosion provided that the foci were shallow, probably within the sedimentary layer. The direct examination of Pg and Sg at short distances leads to a suggestion of differences of focal depth, but this is contradicted by the comparison of P with Pg and of S with Sg. The chief anomaly outstanding is that the comparison of P with Pg suggests an increase in the allowance for the upper layers for a surface focus, that of S with Sg a decrease; the residuals of S and Sg show discrepancies at several points from the hypothesis that the errors are purely random, but their distribution does not suggest any explanation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1947.tb00346.x
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  • 7
    Electronic Resource
    Electronic Resource
    THE PHOTO-CHEMISTRY OF SOME MINOR CONSTITUENTS OF THE EARTH'S ATMOSPHERE (CO2, CO, CH4, N2O) (1952)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 6 (1952), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Carbon dioxide and carbon monoxide: The rate of photo-dissociation of CO2 is appreciable only in the region above about 100 km. If local equilibrium prevails the carbon would occur mainly as the monoxide in this region, and as the dioxide below. However, oxidation may proceed so slowly that the life of a CO molecule is long compared with the characteristic time associated with atmospheric mixing effects. In this case the CO resulting from photo-dissociation would not be confined to above the 100 km level, but would extend much lower; its total abundance could scarcely be great enough to produce the observed absorption lines. It is estimated that the various forms of combustion taking place on the Earth would provide the CO content of the atmosphere within perhaps four years or even less. Methane: Dissociation of CH4 in the upper atmosphere is brought about mainly by collision processes. These prevent the existence of appreciable CH4 above the 100 km level and probably keep the concentration low even down to 70 km. The yield to date from oil wells and coal mines appears to be less than the amount of the gas now in the atmosphere. Seepage from fuel beds, and the anaerobic decay of vegetable matter, are the only obvious naturally occurring sources of significance. As far as can be judged at least ten years (and probably much longer) is required for the production of the atmospheric abundance. Nitrous oxide : Information on the necessary rate of formation of N2O is obtained by calculating the photo-dissociation rate. One hypothesis is that soil micro-organisms produce the gas, but it appears that the yield would only be sufficient if N2O were a major end-product of denitrification. Many of the homogeneous gas reactions suggested by earlier workers must be rejected, since there is an inadequate supply of the requisite parent particles. The only acceptable parent particles seem to be those arising directly or indirectly from the photo-dissociation of O2 in the Herzberg continuum. Various reactions involving O, O3 and N2 are discussed. Though they are very slow they might nevertheless give rise to sufficient N2O.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1952.tb03020.x
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  • 8
    Electronic Resource
    Electronic Resource
    THE RANGE OF EXISTENCE OF RAYLEIGH AND STONELEY WAVES (1947)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 5 (1947), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1947.tb00347.x
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  • 9
    Electronic Resource
    Electronic Resource
    THE FREE-AIR REDUCTION OF GRAVITY TO THE SECOND ORDER (1952)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 6 (1952), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A definition of height is given in terms of the geopotential that will agree to the second order with the height determined by direct measurement along the vertical where such measurement is possible. The free-air reduction of gravity is carried to the second order so as to permit allowance for terms in eh and h2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1952.tb03018.x
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  • 10
    Electronic Resource
    Electronic Resource
    THE TIME NECESSARY FOR A BORE HOLE TO ATTAIN TEMPERATURE EQUILIBRIUM (1947)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 5 (1947), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The time for which it is necessary to leave a bore hole in order that the disturbance of temperature due to drilling may have disappeared is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1947.tb00348.x
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