The possibility of lateral structure inside the core and its implications for nutation and earth tide observations

Details The possibility of lateral structure inside the core and its implications for nutation and earth tide observations The possibility of lateral structure inside the core and its implications for nutation and earth tide observations

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989geoji..99..511w&link_type=abstract

Geophysical Journal International (ISSN 0955-419X), vol. 99, Dec. 1989, p. 511-519.

Physics

48

Earth Core, Earth Planetary Structure, Earth Tides, Gravitational Effects, Nutation, Earth Mantle, Seismology, Spherical Harmonics, Topography

Scientific paper

It is shown that there can be lateral structure inside the fluid core caused by gravitational forcing from the mantle, from the inner core, or from topography on the core-mantle or inner core-outer core boundaries. A method is described for calculating the internal structure, given knowledge of the forcing. The possible effects of this structure on results for the core-mantle boundary topography inferred from observations of the earth's forced nutations and diurnal earth tides are discussed. The possible implications of a thin, low-density fluid layer at the top of the core are considered.

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