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  • GEOPHYSICS  (6)
  • Earthquake precursor: prediction research  (1)
  • Textbook of geophysics  (1)
  • FractureT
  • 1980-1984  (8)
  • 1
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    Geodynamics: Application of Continuum Physics to Geological Problems (1982)
    John Wiley and Sons, 449 pp.
    In:  New York, John Wiley and Sons, 449 pp., vol. 271, no. ALEX(01)-FR-77-01, AFTAC Contract F08606-76-C-0025, pp. 329, (ISBN: 0-08-043649-8)
    Details
    Publication Date: 1982
    Keywords: Textbook of geophysics
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Stress accumulated mechanisms on strike-slip faults (1982)
    Vieweg
    In:  Professional Paper, Open-File Rept., Multidisciplinary Approach to Earthquake Prediction, Braunschweig, Vieweg, vol. 1, no. 16, pp. 471-485, (ISBN 0080419208)
    Details
    Publication Date: 1982
    Keywords: Review article ; Earthquake precursor: prediction research ; Stress ; Strike-slip ; Fault zone ; Modelling
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    A steady state model for the distribution of stress and temperature on the San Andreas Fault (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Keywords: GEOPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Was the early Earth completely molten? (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The nature of the interior of the primitive Earth was examined. The question is posted: was the Earth a cold solid or was it a hot liquid, much like a lava lakes seen in today's volcanic cauldrons. The various energy sources available to heat the primitive Earth to see if they are sufficient to cause melting were analyzed. The two largest contributors to the Earth's early heat appear to be the heat due to accretion and the heat of core formation. The Earth formed by the accretion of particles ranging in size from millimeters to hundreds of kilometers and each impact into the protoearth provided more energy to heat the body. It is found that early in the Earth's history, the sinking of iron to the center of the Earth to form the core released a substantial amount of energy; enough to heat the entire Earth an average 2000 deg C. Mechanisms for the removal of such a large amount of heat appear inadequate to prevent substantial melting, and it is assumed that the Earth was completely molten, i.e., a magma ocean at one time early in its history.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst. 15th Lunar and Planetary Sci. Conf.; p 45-46
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A renormalization group model for the stick-slip behavior of faults (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A fault which is treated as an array of asperities with a prescribed statistical distribution of strengths is described. For a linear array the stress is transferred to a single adjacent asperity and for a two dimensional array to three ajacent asperities. It is shown that the solutions bifurcate at a critical applied stress. At stresses less than the critical stress virtually no asperities fail on a large scale and the fault is locked. At the critical stress the solution bifurcates and asperity failure cascades away from the nucleus of failure. It is found that the stick slip behavior of most faults can be attributed to the distribution of asperities on the fault. The observation of stick slip behavior on faults rather than stable sliding, why the observed level of seismicity on a locked fault is very small, and why the stress on a fault is less than that predicted by a standard value of the coefficient of friction are outlined.
    Keywords: GEOPHYSICS
    Type: NASA-CR-173362 , NAS 1.26:173362 , CONTRIB-766
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Dissipative melting as a mechanism for core formation (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Cosmochemical studies strongly favor a near-homogeneous accretion of the earth. These studies also show that core segregation probably occurred within the first 100,000 years of earth history. Mechanisms of core formation have received relatively little attention. The principal purpose of this paper is to examine dissipative melting as a possible mechanism for core segregation. For a large iron body migrating through the mantle, the potential energy lost by the body is dissipated by frictional heating. If the body has a radius greater than about 30 km, the frictional heating is sufficient to melt a path through which the body can fall. If the iron body is liquid (as expected) with a low viscosity, it would penetrate the mantle as a diapir. The problem of an immiscible liquid body melting its way through a solid is solved, and a family of diapir shapes is obtained. It is found that dissipative heating may be a viable mechanism for core segregation if sufficiently large bodies of liquid iron can form.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research, Supplement (ISSN 0148-0227); 88; B91-B96
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Stress accumulated mechanisms on strike-slip faults (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The tectonic framework causing seismicity on the San Andreas and North Anatolian faults can be understood in terms of plate tectonics. However, the mechanisms responsible for the distribution of seismicity in space and time on these faults are poorly understood. The upper part of the crust apparently behaves elastically in storing energy that is released during an earthquake. The relatively small distances from the fault in which stress is stored argue in favor of a plate with a thickness of 5-10 km. The interaction of this plate with a lower crust that is behaving as a fluid damps the seismic cycling in distances of the order of 10 km from the fault. Low measured heat flow also argues in favor of a thin plate with a low stress level on the fault. Future measurements of stress, strain, and heat flow should help to provide a better understanding of the basic mechanisms governing the behavior of strike-slip faults.
    Keywords: GEOPHYSICS
    Type: International Symposium on Earthquake Prediction in the North Anatolian Fault Zone; Mar 31, 1980 - Apr 05, 1980; Istanbul; Turkey
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    The role of an intracrustal asthenosphere on the behavior of major strike-slip faults (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Strain accumulation measurements adjacent to the San Andreas fault have indicated that the strain accumulation zone extends only a few tens of kms away from the fault. While the restricted zone of cyclic accumulation and release of elastic energy adjacent to major strike-slip faults has been attributed to a viscoelastic asthenosphere's damping effect, the narrowness of the San Andreas zone implies a thickness of the lithosphere that, at 10-20 km, may not be consistent with the relatively low surface heat flow measurements obtained. It is presently proposed that an upper elastic plate extends to a depth of 15 km, and that beneath this upper elastic plate is a soft, intracrustal asthenosphere exhibiting a viscoelastic behavior. A second elastic layer lies under this, followed by the asthenosphere. It is shown that the damping due to the intracrustal asthenosphere can explain the observed narrow zone of cyclic strain accumulation and release.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 5801-581
    Format: text
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