Global Earth dynamics and induced gravity changes

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Abstract
We consider the elastogravitational deformation of an Earth model with a liquid outer core and a surficial fluid layer modeling the oceans or the atmosphere. The surface gravity changes caused by planetary‐scale dynamical phenomena can be expressed in terms of generalized gravimetric factors. Each of these factors is related to a specific boundary condition (in normal or transverse traction, in potential and derivative) which has to be considered at the different interfaces (inner core‐outer core, outer core‐mantle, surface) according to the problem. We apply this formalism to express in a self‐consistent and uniform manner the gravity disturbances due to various sources: tides, Earth rotation, loading process, inner and outer core dynamics, with special attention paid to possible resonance effects.

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