Journal of Physics of the Earth
Online ISSN : 1884-2305
Print ISSN : 0022-3743
ISSN-L : 0022-3743
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Volume 6, Issue 2
Displaying 1-5 of 5 articles from this issue
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  • A New Formula connecting Magnitude and Number of Earthquakes.
    Chuji TSUBOI
    1958 Volume 6 Issue 2 Pages 51-55
    Published: 1958
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.4294/jpe1952.6.51
    JOURNAL FREE ACCESS
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    A new formula
    logn=(1-M/Mx)
    connecting the magnitude M and the number n of earthquakes is proposed, where
    n0……number of earthquakes having a magnitude 0,
    Mx……magnitude of the largest conceivable earthquake.
    This formula represents observational facts very nicely. It involves only one constant log n0, in a contrast with the formula by GUTENBERG and RICHTER
    logN=a+b(8-M)
    which involves two. a and b in the above formula have beee found not to be quite independent.
    The new formula implies that n(M) is equal to n0f(M), instead of being equal to n0·φ(M), as is usually taken for granted.
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  • On the Sensitivity Ratio of Clay
    Shin'ichi YAMAGUCHI
    1958 Volume 6 Issue 2 Pages 57-73
    Published: 1958
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.4294/jpe1952.6.57
    JOURNAL FREE ACCESS
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    By taking as sample Osaka alluvial clay which is called Kaolinite and the clay gathered from Okuramura land creep region, Yamagata prefecture, the author studied the sensitivity of clay. As the result, we could comprehend that it is due to the special water in case of the former clay, while in case of the latter clay it is due to the difference in the arrangement of the scale-like particles.
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  • Gravity Survey on Kuttyaro Caldera Lake.
    Izumi YOKOYAMA
    1958 Volume 6 Issue 2 Pages 75-79
    Published: 1958
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.4294/jpe1952.6.75
    JOURNAL FREE ACCESS
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    A gravimeter survey was made on the frozen surface of the gigantic caldera lake, Kuttyaro. A Gravity low, reaching -46 milligals, was found, with iso-anomaly contour lines conforming the caldera shape. A layer of coarse pumice thickening toward the centre is required to account for the observed anomalies. This is compatible with volcanological inferences. Gravity anomaly distributions at several other calderas are discussed also.
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  • Ray-theoretical Construction of Dispersive RAYLEIGH Waves
    Kyozi TAZIME
    1958 Volume 6 Issue 2 Pages 81-89
    Published: 1958
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.4294/jpe1952.6.81
    JOURNAL FREE ACCESS
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    Many studies have been published on dispersive RAYLEIGH waves. However they were mainly confined within either dispersion-curves or ratios of vertical displacement to horizontal one where POISSON'S ratio of the layer was usually assumed to be 0.25. The present author has attempted to carry out more general studies than before on absolute amplitudes for various values of POISSON'S ratio. In order to investigate the superficial waves near the surface of the earth, scholars must undertake these general studies, though theoretical treatments will be considerably troublesome.
    For this purpose, displacement-potentials have been expressed with reflecting coefficients in this paper where a useful operator has been derived from the characteristic equation.
    The characteristic equation in general has been expressed by a hyperbola.
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  • Transition from Solid to Liquid Superficial Waves in a Plate.
    Kyozi TAZIME
    1958 Volume 6 Issue 2 Pages 91-99
    Published: 1958
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.4294/jpe1952.6.91
    JOURNAL FREE ACCESS
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    Even if POISSON's ratio reaches 0.5, neither M1(1) nor M1(2) can coincide with the first order of superficial liquid waves. Each branch of dispersive RAYLEIGH waves should correspond respectively to sin αH=0 or sin βH=0. The former is not other than the dispersion-curves of liquid waves. On the contrary, amplitudes must be zero on the latter. Not always does the first order of dispersive RAYLEIGH waves correspond to the first order of sin αH=0.
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