the physical surface of the Earth

The study aims to determine and interpret the distribution of the global tangential mass force (TMF) vector field by azimuthal orientation and intensity. Using cluster and correlation analysis, we compared the direction of the TMF vector field with the direction of movement of permanent GNSS stations and the direction of movement of the GSRM model continental velocities from the Global Strain Rate Map Project. Methodology. The author continues their study of additional planetary stresses in the lithosphere caused by distributed mass forces.

Purpose. Planetary problems play in geosciences very important role. The aim of this work is to improve methods and algorithms for approximating of the physical surface of the planet by biaxial and triaxial ellipsoid for study the dynamics of change of its shape. Methods. Classical approaches to the determination of Earths shape provide computation of evolution ellipsoid parameters of that in the best way fits to geoid, or quasigeoid. Such approach allows to provide initial reference surface for many coordinates systems.