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  • SPACE SCIENCES  (12)
  • Seismics (controlled source seismology)  (2)
  • Subduction zone  (1)
  • Velocity  (1)
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Keywords
Years
  • 1
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    Velocities of seismic waves in porous rocks (1976)
    In:  Geophysics, Warszawa, EGS, vol. 41, no. 1, pp. 621-645, pp. B05S16, (ISSN: 1340-4202)
    Details
    Publication Date: 1976
    Keywords: Seismics (controlled source seismology) ; Velocity ; Physical properties of rocks ; Fluids ; Toksoez ; Toksoz
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Temperature field and geophysical effects of a down going slab (1971)
    In:  J. Geophys. Res., Warszawa, EGS, vol. 76, no. 1, pp. 1113-1138, pp. B05S16, (ISSN: 1340-4202)
    Details
    Publication Date: 1971
    Keywords: Geothermics ; Plate tectonics ; Subduction zone ; Seismicity ; JGR ; Toksoez ; Toksoz
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Attenuation of seismic waves in dry and saturated rocks: I. Laboratory measurements (1979)
    In:  Geophysics, Warszawa, EGS, vol. 44, no. 1, pp. 681-690, pp. B05S16, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Attenuation ; Fluids ; Quality factor ; Seismics (controlled source seismology) ; Laboratory measurements ; Toksoez ; Toksoz
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Thermal history and evolution of the moon. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: In this work, theoretical lunar temperature models are computed taking into account different initial conditions to represent possible accretion models and various abundances of heat sources to correspond to different compositions. Differentiation and convection are simulated in the numerical computational scheme. Models of the thermal evolution of the moon that fit the chronology of igneous activity on the lunar surface, the stress history of the lunar lithosphere implied by the presence of mascons, and the surface concentrations of radioactive elements, involve extensive differentiation early in lunar history. This differentiation may be the result of rapid accretion and large-scale melting or of primary chemical layering during accretion. Differences in present-day temperatures for these two possibilities are significant only in the inner 1000 km of the moon and are not resolvable with presently available data.
    Keywords: SPACE SCIENCES
    Type: The Moon; 7; May-June
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    NASA TECHNICAL REPORTS
  • 5
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    Velocity structure and properties of the lunar crust. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: SPACE SCIENCES
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    NASA TECHNICAL REPORTS
  • 6
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    Lunar crust - Structure and composition. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Lunar seismic data from artificial impacts recorded at three Apollo seismometers are interpreted to determine the structure of the moon's interior to a depth of about 100 kilometers. In the Fra Mauro region of Oceanus Procellarum, the moon has a layered crust 65 kilometers thick. The seismic velocities in the upper 25 kilometers are consistent with those in lunar basalts. Between 25 and 65 kilometers., the nearly constant velocity (6.8 kilometers per second) corresponds to velocities in gabbroic and anorthositic rocks. The apparent velocity is high (about 9 kilometers per second) in the lunar mantle immediately below the crust.
    Keywords: SPACE SCIENCES
    Type: Science; 176; June 2
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    NASA TECHNICAL REPORTS
  • 7
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    Thermal evolution of the moon. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The thermal history and current state of the lunar interior are investigated using constraints imposed by recent geological and physical data. Theoretical temperature models are computed taking into account different initial conditions, heat sources, differentiation and simulated convection. To account for the early formation of the lunar highlands, the time duration of magmatism and present-day temperatures estimated from lunar electrical conductivity profiles, it is necessary to restrict initial temperatures and abundances of radioactive elements. Successful models require that the outer half of the moon initially heated to melting temperatures, probably due to rapid accretion. Differentiation of radioactive heat sources toward the lunar surface occurred during the first 1.6 billion years. Temperatures in the outer 500 km are currently low, while the deep interior (radius less than 700 to 1000 km) is warmer than 1000 C, and is of primordial material.
    Keywords: SPACE SCIENCES
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    NASA TECHNICAL REPORTS
  • 8
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    Geophysical data and the interior of the moon (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Geophysical data and physical properties of the lunar interior are considered, giving attention to density, gravity field, viscosity, the strength of lunar materials, electrical conductivity, and magnetic properties. Seismic data and structure of the lunar interior are discussed, taking into account moonquakes and lunar tectonism, the velocity structure, and the compositional implications of the velocity structure. Questions regarding the thermal state and the evolution of the moon are also explored. The data and the models presented characterize the moon as a differentiated body which evolved relatively early in its history.
    Keywords: SPACE SCIENCES
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    NASA TECHNICAL REPORTS
  • 9
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    Lunar velocity structure and compositional and thermal inferences (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Seismic data from Apollo Passive Seismic Network stations are analyzed to determine the velocity structure in the lunar crust and mantle. Since the publication of earlier results additional data has become available from the S-IVB impacts of the Apollo 16 and 17 missions and the LM ascent stage impact of the Apollo 17 mission. Data from these artificial impacts now cover a distance range of 9 to 1700 km. Travel times, amplitudes, and theoretical seismograms are used to derive a velocity structure for the outer 150 km of the moon. Preliminary results are given from the analysis of the complete set of seismograms.
    Keywords: SPACE SCIENCES
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    NASA TECHNICAL REPORTS
  • 10
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    Seismic scattering and shallow structure of the moon in Oceanus Procellarum (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Scattering in a high-Q medium has been the best hypothesis to date for explaining the observation of a long, reverberating train of waves in lunar seismographs. To test this hypothesis qualitatively, two experiments were devised which simulated this scattering and reproduced actual lunar seismographs. Pulses were propagated across a plate with grooves cut half-way through, and then were propagated along the edge of a plate with holes drilled within a skin depth of the edge. The seismographs of near impacts and moonquakes recorded by the Apollo 12 station in two frequency bands were studied. The impacts were those of S4B Saturn boosters and LM ascent stages. Interpretation of these data suggests the existence of a scattering layer 25 km thick with a Q of 5000. The density of the scatterers decreases with depth, suggesting that they are associated with cratering, or that they consist of cracks which anneal with depth.
    Keywords: SPACE SCIENCES
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    NASA TECHNICAL REPORTS
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