Gravity and GPS Observations in the Inland, Antarctica

In the severe environment of polar regions geophysical and geodetic data are relatively sparse. Although various satellite data are recently available in polar regions, it is extremely important that surface observation data be used as ground truth.This paper presents the result of gravity and GPS observations obtained in Antarctica. The Bouguer gravity anomalies obtained shows the large negative anomaly trending inland toward Dome Fuji of the most southern observation area at about — 200 mgal. It indicates that the observed Bouguer gravity anomalies express the depth of Moho discontinuity, thus indicating a thickening of the crust inland. In addition, GPS observations were carried out several points on the traverse route. The baseline length between Syowa and Dome Fuji was 933133.144 m(rms:0.12m) and height of Dome Fuji point was 3796.779 m(rms:0.27m). The obtained results indicate that the movements of ice sheet are certainly detectable in the inland, Antarctica.