Physics
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.1953s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Feb. 10, 1989, p. 1953-1976.
Physics
55
Earth Movements, Earth Planetary Structure, Geoids, Seismic Waves, Tectonics, Asphericity, Attenuation, Oscillator Strengths, Resonant Frequencies, Seismograms, Seismology
Scientific paper
A theory is presented in which the seismogram of an unresolvably split normal mode multiplet for an aspherical earth may be exactly expressed using a time-dependent location parameter. Synthetic data tests indicate that the theory could explain up to 95 percent of the frequency variance and 68 percent of the attenuation variance. The theory is used to analyze a data set of about 1200 complex center frequency measurements for each of the fundamental spherical codes. Degree 2-10 structure coefficients are estimated and compared with those from previous studies. It is found that the structure coefficients correlate at the 75-80 percent confidence level with degree 2-8 geoid coefficients. Correlations with structure coefficients derived from a tectonic regionalization are poor, suggesting that surface tectonic features are not strongly related to upper mantle structure below 150 km in depth.
Masters Guy
Smith Mark F.
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