Gravity Spectra from the Density Distribution of Earth’s Uppermost 435?km

摘要

AbstractThe Earth masses reside in a near-hydrostatic equilibrium, while the deviations are, for example, manifested in the geoid, which is nowadays well determined by satellite gravimetry. Recent progress in estimating the density distribution of the Earth allows us to examine individual Earth layers and to directly see how the sum approaches the observed anomalous gravitational field. This study evaluates contributions from the crust and the upper mantle taken from the LITHO1.0 model and quantifies the gravitational spectra of the density structure to the depth of 435?km. This is done without isostatic adjustments to see what can be revealed with models like LITHO1.0 alone. At the resolution of 290?km (spherical harmonic degree 70), the crustal contribution starts to dominate over the upper mantle and at about 150?km (degree 130) the upper mantle contribution is nearly negligible. At the spatial resolution$$<150,hbox {km},$$