A new technique in demodulation of normal modes

Details A new technique in demodulation of normal modes A new technique in demodulation of normal modes

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pepi...84..139n&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 84, Issue 1-4, p. 139-160.

Physics

3

Scientific paper

Lateral heterogeneities of the Earth produce amplitude modulations of the so-called unresolved multiplets. A spectral fitting technique based on the polynomial interpolation of Hermite allows the retrieval of these slowly varying modulation functions. No restrictive hypothesis on coupling among multiplets is necessary. Modulation functions are constrained in time within a Q-cycle for data with typical signal-to-noise ratios. Sensitivity to noise is reduced by the introduction of cosine tapers and by a priori information on the modulation functions. The method then damps rapid oscillations caused by noise and becomes stable. These amplitude modulations can be used in a first stage for inversions where both phase and amplitude are necessary, and generalize basic mode observables such as the local frequency.

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