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The variation in the figure axis in the Earth owing to the geophysical causesdirectly reflects the physical state of the Earth and therefore, it isimportant for understanding the Earth. Of the variations in the figure axisarising from different causes, the variation owing to the Earth's geophysicalcauses is determined from polar motion data. Equations that give the relationbetween the figure axis and rotational axis are derived and the motion of thefigure pole with respect to the Earth's surface or the figure axis in the Earthis determined by using these equations. Estimation of error suggests that theaccuracy of the determination for the position of the figure pole at eachmoment is sufficiently good and that even a variation that occurs during ashort duration of time, such as one or two days, is significant. The determinedposition of the figure pole exhibits a rapid and complicated motion in a shortduration. On the other hand, a long-range average of the pole shows stableannual and semi-annual variations, but it is quite independent of the Chandlerwobble.

Variation in the Earth's figure axis owing to geophysical cause, minutely determined from polar motion