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Lower mantle heterogeneity, dynamic topography and the geoid

机译:下地幔非均质性,动态地形和大地水准面

摘要

Density contrasts in the lower mantle, recently imaged using seismic tomography, drive convective flow which results in kilometers 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 boundary topography predicts the largest wavelength components of the geoid remarkably well. Neglecting dynamic surface deformation leads to geoid anomalies of opposite sign than are observed.
机译:最近使用地震层析成像法成像的下地幔的密度对比驱动了对流,这导致了在地幔边界和地球表面动态保持数千米的地形。由于内部密度对比和边界形貌而产生的总重力场非常好地预测了大地水准面的最大波长成分。忽略动态表面变形会导致与观察到的相反的大地水准面异常。

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