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  • 1985-1989  (6)
  • 1975-1979
  • 1986  (6)
Collection
Keywords
Publisher
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  • 1985-1989  (6)
  • 1975-1979
Year
  • 1
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    Fractals and fragmentation (1986)
    In:  J. Geophys. Res., Taipei, EGS, vol. 91, no. 2, pp. 1921-1926, pp. 8039, (ISSN: 1340-4202)
    Details
    Publication Date: 1986
    Keywords: FractureT ; Fracture ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Isotopic modeling of the evolution of the mantle and crust (1986)
    American Geophysical Union
    Details
    Publication Date: 1986-01-01
    Print ISSN: 8755-1209
    Topics: Geosciences
    Published by American Geophysical Union
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    PAPER CURRENT
  • 3
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    Fractals and fragmentation (1986)
    American Geophysical Union
    Details
    Publication Date: 1986-01-01
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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    PAPER CURRENT
  • 4
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    Implications of isotope data for the origin of the moon (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Lunar isotope data are studied in terms of lunar reservoir models. An analysis is performed to determine how the samarium-neodymium and rubidium-strontium systems evolve in terms of a two-reservoir model. Isotope data from lunar rocks show much more variability than similar data from terrestrial rocks. The midocean ridge basalts yield consistent isotope signatures on a worldwide basis suggesting that vigorous mantle convection has mixed and homogeneized the upper mantle beneath the lithosphere plates. The variability of the lunar data is taken as evidence for distinct source regions which in effect support a relatively cool origin of the moon.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A fractal model for crustal deformation (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: It is hypothesized that crustal deformation occurs on a scale-invariant matrix of faults. For simplicity, a two-dimensional pattern of hexagons on which strike-slip faulting occurs is considered. The behavior of the system is controlled by a single parameter, the fractal dimension. Deformation occurs on all scales of faults. The fractal dimension determines the fraction of the total displacement that occurs on the first-order or primary faults. The value of the fractal dimension can be obtained from the frequency-magnitude relation for earthquakes. The results are applied to the San Andreas fault system in central California. Earthquake studies give D = 1.90. The main strand of the San Andreas fault is associated with the primary faults of the fractal system. It is predicted that the relative velocity across the main strand is 2.93 cm/yr. The remainder of the relative velocity of 5.5 cm/yr between the Pacific and North American plates occurs on higher-order faults. The predicted value is in reasonably good agreement with the value 3.39 + or - 0.29 cm/yr obtained from geological studies.
    Keywords: GEOPHYSICS
    Type: Tectonophysics (ISSN 0040-1951); 132; 261-269
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Fractals and fragmentation (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The use of renormalization group techniques on fragmentation problems is examined. The equations which represent fractals and the size-frequency distributions of fragments are presented. Method for calculating the size distributions of asteriods and meteorites are described; the frequency-mass distribution for these interplanetary objects are due to fragmentation. The application of two renormalization group models to fragmentation is analyzed. It is observed that the models yield a fractal behavior for fragmentation; however, different values for the fractal dimension are produced . It is concluded that fragmentation is a scale invariant process and that the fractal dimension is a measure of the fragility of the fragmented material.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; 1921-192
    Format: text
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    NASA TECHNICAL REPORTS
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