Earth Inner Core Periodic Motion due to Pressure Difference Induced by Tidal Acceleration

TL;DR

This paper proposes that tidal acceleration causes periodic motion of Earth's inner core, which is eccentric and possibly faster than the mantle, explained through a hydrodynamic bearing model and analyzed via seismic and gravitational data.

Contribution

It introduces a new explanation for inner core motion based on tidal acceleration and models the Earth core system as a hydrodynamic bearing, supported by seismic and gravitational analysis.

Findings

Inner core is eccentric and possibly rotates faster than mantle.

Tidal acceleration induces periodic motion and nutation frequencies.

Earth core system can be modeled as a hydrodynamic bearing.

Abstract

The inner structure of the earth is still a topic of discussion. Seismic measurements showed a structure of solid, liquid, solid which describes the mantle, outer core and inner core with the inner core in the center. The analysis of waveform doublets suggests now that the inner core is out of center and even of faster rotation than the mantel and crust. From the sum of Buoyancy and Gravity on the earth inner core, the position energy is plotted and together with the tangential tidal acceleration, it is derived that Earth Inner Core cannot be in a center position without additional force. The Earth Core System is explained as Hydrodynamic Bearing. The tidal acceleration is identified as the reason for the periodic motion of the inner core and certain frequencies of nutation. The Eccentricities out of nutation due to the effects from the sun and moon are calculated as an approximation.