Observations of free oscillation amplitude anomalies

Details Observations of free oscillation amplitude anomalies Observations of free oscillation amplitude anomalies

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..895p&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, Sept. 1987, p. 895-898.

Physics

7

Amplitude Distribution Analysis, Earth Mantle, Earth Planetary Structure, Free Vibration, Seismology, Anomalies, Frequency Shift, Group Velocity, Phase Shift

Scientific paper

The fundamental spheroidal multiplet amplitudes in the band l of between 26 and 43, inclusively, investigated for a number of IDA records show systematic anomalies which are attributable to long-wavelength lateral structure. It is suggested that complexities in the amplitude observations can be caused by source finiteness, short-wavelength lateral structure, or the shortcomings of modeling unresolvably split multiplets as single resonances. Results from common source-receiver paths show consistent sampling of the structure underlying these paths. A systematic shift of the theoretical spherical earth nodal lines either toward or away from the epicenter resulted, for many records, in a better fit of amplitudes.

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