Coupling between the multiplets of laterally heterogeneous earth models.

Details Coupling between the multiplets of laterally heterogeneous earth models. Coupling between the multiplets of laterally heterogeneous earth models.

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989geoj...96..371t&link_type=abstract

Geophys. J., Vol. 96, No. 3, p. 371 - 379

Statistics

Computation

16

Earth: Models, Earth: Oscillations

Scientific paper

The authors use the variational method to calculate the eigensolutions of a realistic laterally heterogeneous earth model for two separate cases: one in the period range around 200 s and the other in the period range around 160 s. The basis set consists of the singlets of as many spheroidal and toroidal fundamental multiplets of the spherically symmetric part of the earth model as is computationally feasible. The authors expand the laterally heterogeneous structure in spherical harmonics up to angular order 10, i.e. a surface wavelength of 4000 km. The results show that there is strong coupling not only between immediately adjacent fundamental multiplets of the same dispersion branch, but also between toroidal and spheroidal multiplets.

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