Wavelet analysis of the variable Chandler wobble

We develop a new wavelet analysis technique, namely wavelet amplitude‐period spectrum (WAPS) to study the variations of the Chandler wobble (CW). The variable period and amplitude of the CW during 1900–1990 are quantified by using the WAPS technique. We show that the double‐frequency spectrum of the...

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Bibliographic Details
Published inGeophysical research letters Vol. 27; no. 18; pp. 3001 - 3004
Main Authors Liu, L. T., Hsu, H. T., Gao, B. X., Wu, B.
Format Journal Article
LanguageEnglish
Published Washington, DC Blackwell Publishing Ltd 15.09.2000
American Geophysical Union
Subjects
Amplitudes
Chandler wobble
Damping
Earth sciences
Earth, ocean, space
Exact sciences and technology
Excitation
Geophysics
Internal geophysics
Laws
Solid-earth geophysics, tectonophysics, gravimetry
Wavelet
Wavelet analysis
Earth
amplitude
free oscillations
rotation
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Summary:We develop a new wavelet analysis technique, namely wavelet amplitude‐period spectrum (WAPS) to study the variations of the Chandler wobble (CW). The variable period and amplitude of the CW during 1900–1990 are quantified by using the WAPS technique. We show that the double‐frequency spectrum of the CW is related to the large variation in its period with respect to time. We find that amplitude and period of the CW clearly fit exponential laws during 1912–1928 and 1936–1948, corresponding to the strong damping and the strong excitation respectively. Our study suggests that the excitation and damping of the CW might well be in an equilibrium status during 1962–1990.
Bibliography:ark:/67375/WNG-RBMT8MDJ-L
istex:3B366797F5D4DE5FE3626CD50E0D4D5F89808790
ArticleID:1999GL011094
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0094-8276
1944-8007
DOI:10.1029/1999GL011094