Body tides on an elliptical, rotating, elastic and oceanless earth

Concepts

GeophysicsTidal DynamicsPlate TectonicsMarine GeologyEngineeringPhysical OceanographySeismology'Body TideCrustal DeformationEarth-moon SystemTidal PowerTidal ZoneOceanographyOceanless EarthBody TideElliptical StratificationEarth ScienceGeodesy

TL;DR

The Earth's deformation caused by the luni‑solar tidal force is defined as the “body tide”. The study computes the effects of Earth's rotation and elliptical stratification on the body tide using modern elastic structural models. The authors model these effects by incorporating rotation and elliptical stratification into elastic structural models. Rotation and ellipticity within the mantle alter tidal observations by about 1 %, improve the fluid core resonance estimate in the diurnal band, and the models agree well, enabling tidal effects of a globally averaged, oceanless, rotating, elliptical, elastic Earth to be modeled to an accuracy of at least one part in 300.

Abstract

The Earth's deformation caused by the luni-solar tidal force is defined as the 'body tide'. We compute the effects of the Earth's rotation and elliptical stratification on the body tide for a number of modern elastic structural models. Rotation and ellipticity within the mantle are found to affect tidal observations by about 1 per cent. A consequence is an improved estimate for the fluid core resonance in the diurnal tidal band. Agreement between results for the different structural models is very good. As a result, the results computed here can be used to model the tidal effects of a globally averaged, oceanless, rotating, elliptical and elastic earth to an accuracy of at least one part in 300.