GPS observations on the Antarctic ice sheet conducted during JARE-41

• Main Authors: Koichiro Doi, Naoya Imaei, Naoyosi Iwata, Noritsune Seo
• Format: Article in Journal/Newspaper
• Language: English; Japanese
• Published: National Institute of Polar Research 2004
• Subjects: Geography (General); G1-922; Antarctic; Mizuho; Mizuho Station; The Antarctic; Yamato; Antarc*; Ice Sheet
• Online Access: https://doi.org/10.15094/00009278; https://doaj.org/article/eca0ea27109b41f88f3a2ea164deac33

We conducted GPS observations at three sites on the Antarctic ice sheet during wintering of the 41st Japanese Antarctic Research Expedition (JARE-41). The three sites are N7 (vicinity of coastline), Mizuho Station (260km inland on the ice sheet), and YM175 (bare ice field near the Yamato Mountains). Continuous data for more than four days were obtained and velocity vectors were determined with reference to the Syowa International GPS Service for Geodynamics (IGS) site using a precise ephemeris. The obtained velocity at N7 was 1.5cm/day and the direction was N60°W. At Mizuho Station, the observed velocity was 6cm/day and the direction was N60°W. These values showed good agreement with previous observations by H. Motoyama et al. (Nankyoku Shiryo, 39, 94, 1995). At YM175, continuous observation for more than 10 days was carried out; observed vertical and lateral displacements were about 1cm. The considerable upward displacement as well as the small lateral displacement supports the meteorite accumulation hypothesis for the Yamato Mountains region.