Journal of Physics of the Earth
Online ISSN : 1884-2305
Print ISSN : 0022-3743
ISSN-L : 0022-3743
Search
Advanced search
OR
Browse
Search
Volume 40, Issue 4
Displaying 1-4 of 4 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Tidal Deformation of the Moon
    Masatsugu Ooe, Hideo Hanada
    1992 Volume 40 Issue 4 Pages 525-534
    Published: 1992
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.4294/jpe1952.40.525
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Tides on the surface of the Moon are investigated. The tidal potential, gravity and displacements on the surface of the Moon are expanded in harmonics depending on general forms of the lunar motion, which would accept the orbital evolution. These are expressed in numerical formulas more exactly for uses in correction for precise determination of the lunar motions and for possible observations of the tides of the Moon. Love numbers are computed for some expected models of the lunar interior. Possibilities are shown to discriminate the core effect in the tidal observations.
    View full abstract
    Download PDF (694K)
  • Synthetic Near-Field Seismograms Due to Rupture-Propagation Fault Models
    Kenji Hirata
    1992 Volume 40 Issue 4 Pages 535-554
    Published: 1992
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.4294/jpe1952.40.535
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Complete displacement potentials due to kinematic fault models with a bidirectional-bilateral and a fan-shaped rupture-propagations are derived in the Weyl integral representation. Dunkin's formulation of propagator-matrix method is used to compute the seismic responses of a flat-layered medium. Surface displacements are evaluated with the exact wavenumber discretization technique. Fast computation of synthetic near-field seismograms is made with a time-reducing device. A vertically traveling plane S-wave element (VTSE), which relates to contribution of a fault segment just below an observed station to wavenumber responses, in the Weyl integral representation is also participated in the computation. The synthetic near-field seismograms computed show that the contribution of VTSE to wavenumber responses is larger for a lower frequency range or a smaller epicentral distance. This is explained qualitatively by the saddle point approximation of the steepest descent method. Some numerical examples are presented to demonstrate the advantage of our method.
    View full abstract
    Download PDF (1879K)
  • Anisotropic Modelings of the Hydrothermal Convection in Layered Porous Media
    Hidenori Masamoto, Satoru Honda
    1992 Volume 40 Issue 4 Pages 555-564
    Published: 1992
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.4294/jpe1952.40.555
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Equivalence of anisotropic modelings of the hydrothermal convection to the layered permeability distribution is examined by 2-D numerical imulations. Permeability varies sinusoidally in horizontal or vertical directions. For the horizontally layered cases, flow fields approach monotonically to the corresponding anisotropic models, as the wavelength of permeability variation decreases. We find that the anisotropic modeling for this case may become valid, when the wavelength of permeability variation is equal to or less than the thickness of thermal boundary layers. For the vertically layered cases, since the vertical motion of the fluid is sensitive to the horizontal variation of permeability, the cell structure is different from the corresponding anisotropic models.
    View full abstract
    Download PDF (882K)
  • P-Coda Amplitude As a Measure of Earthquake Magnitude of Local Microearthquake
    Koji Masuda
    1992 Volume 40 Issue 4 Pages 565-572
    Published: 1992
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.4294/jpe1952.40.565
    JOURNAL FREE ACCESS
    Download PDF (638K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top