Polar Motion Effect on Gravity Observed with a Superconducting Gravimeter at Syowa Station, Antarctica
Polar motion effect on gravity was analyzed using the 2 years data obtained with a superconducting gravimeter at Syowa Station, Antarctica. From the analysis, we obtained the amplitude factor (δ-factor) of 1.198±0.035 and a time lag about 20 days against to the gravity changes predicted from the IERS (International Earth Rotation Service) polar motion data. Our analysis using simulation data suggests that the results for least-squares fitting are affected by the accuracy of the correction for step-like changes in the observed gravity data.
KeywordsPolar Motion Gravity Change Superconducting Gravimeter Annual Component Annual Amplitude
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