Constraining aspherical structure with low-degree interaction coefficients - Application to uncoupled multiplets

Details Constraining aspherical structure with low-degree interaction coefficients - Application to uncoupled multiplets Constraining aspherical structure with low-degree interaction coefficients - Application to uncoupled multiplets

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.6369r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, June 10, 1988, p. 6369-6396.

Physics

55

Asphericity, Free Vibration, Seismology, Vibrational Spectra, Amplitudes, Coefficients, Constraints, Error Analysis, Perturbation Theory, Signal To Noise Ratios

Scientific paper

In a study on the effect of even-order aspherical structure on displacement for each isolated multiplet in the earth's seismic free oscillation spectrum, coefficients characterizing the interaction between singlets are estimated by a technique called spectral fitting. Spectral fitting is applied to about 350 recordings taken from 18 large or deep events and the degrees 2 and 4 interaction coefficients for 38 low harmonic degree multiplets are estimated. The degree 2 mantle sensitive coefficients behave smoothly along the low radial order dispersion branches. It is determined that a wide range of mantle models will quantitatively fit the mantle sensitive coefficients, the fundamental mode coefficients computed from multiplet center frequency observations and the geoid, simultaneously. Anomalous multiplets are dominated by degree 2 axisymmetric structure somewhere in the core.

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