Engineering topics
Publications and source records attributed to Gross, R..
Long-period tidal variations of the Earth's rotation rate are caused by the redistribution of mass associated with the respective elastic solid Earth tides, the ocean tide heights, and the anelasticity of the Earth's mantle, and by the relative angular momentum associated with the long-period ocean tide currents.
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Currently available estimates of changes in the length of day (LOD) date back to about 1630 and have associated uncertainties of at most +/- 1 ms after 1700.
Any irregularly shaped solid body rotating about some axis that is not aligned with its figure axis will wobble as it rotates.
The oceans have a major impact on global geophysical processes of the Earth.
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NOne. This is a set of viewgraph print outs for a presentation for the 1996 Spring Meeting of the American Geophysical Union. The presentation concerned using a Kalman filter to combine independently determined Earth orientation measurements from all modern, space-geodetic techniques.
The solid Earth wobbles on all observable time scales, yet the excitation mechanism(s) of these observed variations are largely unknown. Diurnal and semi-diurnal ocean tides have been shown to be the dominant cause of sub-daily polar motion, and atmospheric pressure and wind fluctuations have been shown to be the main cause of the annual wobble. However, at virtually all other frequencies the cause(s) of the observed polar motions are largely unknown. Here, intraseasonal fluctuations in atmospheric pressure and wind are studied to determine the extent to which they may cause the observed rapid polar motions.
Thirteen years of satellite laser ranging measurements to LAGEOS (1980-1992) have been analyzed to investigate the variations of the Earth's gravity field.
Besides operating its own energy budget, an earthquake acts as an agent transferring a much greater amount of energy among the Earth's rotation, elastic field, gravitational field, and internal heat.
The kinetic energy of the Earth's rotation can be separated into two parts: the spin energy and the polar motion energy.