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  • GEOPHYSICS  (1)
  • GEOSCIENCES (GENERAL)  (1)
  • perturbation theory
  • 1975-1979  (2)
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  • 1
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    Unknown
    Absolute plate motions by boundary velocity minimizations (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The main interaction of the earth's interior with the lithosphere is as a material source and sink. An absolute reference frame defined by minimizing the translational motion of tectonic plate boundaries differs by 0.6 cm/year from a frame defined by hot spot traces and by 0.4 cm/year from the frame defined by the most plausible model of drag forces on the plates. The rms absolute translational velocities are about 2 cm/year for ocean-ocean plate boundaries and 1.5 cm/year for ocean-continent plate boundaries. The close agreement between the source and sink and the drag-dependent definitions suggests that the lithosphere, as a stress guide, to some extent controls the locations of its sources and sinks.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 80; Jan. 10
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Geodynamics from satellites (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The NASA Geodynamics Program is developing a variety of techniques in support of national programs in geodynamics, geomagnetics and earthquake hazard reduction. Global tectonics are to be observed by satellite laser tracking and radio interferometry, which will be used to measure the movements of extended (greater than 200 km) regions to an accuracy of 3 cm, while for shorter distances, lasers enable a more rapid measuring of regional strain accumulation patterns than ground systems. The techniques of Doppler tracking between two satellites to measure the gravity field over the ocean is also under NASA study
    Keywords: GEOSCIENCES (GENERAL)
    Type: AAS PAPER 79-243 , Annual Meeting; Oct 29, 1979 - Nov 01, 1979; Los Angeles, CA
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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