Lower mantle heterogeneity, dynamic topography and the geoid | Zendy

Bradford H. Hager | Zendy; R. W. Clayton | Zendy; Mark A. Richards | Zendy; R. P. Comer | Zendy; Adam M. Dziewoński | Zendy

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Lower mantle heterogeneity, dynamic topography and the geoid

Author(s) -

Bradford H. Hager,

R. W. Clayton,

Mark A. Richards,

R. P. Comer,

Adam M. Dziewoński

Publication year - 1985

Publication title -

nature

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 15.993

H-Index - 1226

eISSN - 1476-4687

pISSN - 0028-0836

DOI - 10.1038/313541a0

Subject(s) - geoid , geology , mantle (geology) , geodesy , ocean surface topography , geophysics , measured depth

Density contrasts in the lower mantle, inferred using seismic tomography, drive viscous flow; this results in kilometres of dynamically maintained topography at the core–mantle boundary and at the Earth's surface. The total gravity field due to interior density contrasts and dynamic boundary topography predicts the longest-wavelength components of the geoid remarkably well. Neglecting dynamic surface deformation leads to geoid anomalies of opposite sign to those observed.

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