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  • GEOPHYSICS  (3)
  • Nuclear Reactions
  • 1985-1989  (3)
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  • 1
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    Excitation study of the Lageos-derived Chandler wobble (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Euler (1765) has deduced that any nonspherical rigid body which is rotating about some axis that is not its principal moment of inertia axis will experience a wobble as it rotates. The earth's wobble predicted by Euler was actually detected by Chandler (1891). The present paper is concerned with this wobble which is now known as the Chandler wobble. The Chandler wobble has now been under observation for more than 80 years. During part of this time, the amplitude of the wobble has actually been seen to grow. It follows that there must be some mechanisms operating to maintain (or excite) the Chandler wobble preventing it from decaying. Possible excitation mechanisms considered include earthquakes and meteorological variations. In this paper, an analysis is conducted of Lageos polar motion data for the period 1977-1983 to find out what can be learned from these data about the excitation mechanisms.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 9369-938
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The influence of earthquakes on the Chandler wobble during 1977-1983 (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Variations in the Chandler wobble's excitation function are examined in order to study the effect of 1287 earthquakes on the Chandler wobble. The computation of the moment tensor data using the centroid-moment tensor solution technique is described. An excitation function is calculated from the moment tensor data and compared to an observed excitation function derived from the polar motion observations of Gross and Chao (1985). It is observed, based on the power spectrum of the earthquake excitation function, that the earthquakes' static deformation fields have little influence on the Chandler wobble during 1977-1983.
    Keywords: GEOPHYSICS
    Type: Geophysical Journal (ISSN 0016-8009); 85; 161-177
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Signal detection techniques applied to the Chandler wobble (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A sudden excitation event of the Chandler wobble should induce the earth's rotation pole to undergo damped harmonic motion. This type of motion has been searched for in the observations of the Chandler wobble using techniques based upon the concept of a matched filter. Although the signal detection techniques used here were not sensitive enough to detect any such isolated sudden excitation events, the result that was obtained is consistent with a randomly excited model of the Chandler wobble.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 10
    Format: text
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    NASA TECHNICAL REPORTS
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