Gravimetric connection between Asuka Camp and Syowa Station, and gravity survey on Rundvagshetta

Abstract

Gravimetric connection between Asuka Camp and Syowa Station was established during the summer activities of the 27th Japanese Antarctic Research Expedition (JARE-27). Gravity measurements were carried out by using two LaCost & Romberg gravimeters model G (G-477 and -805) at Asuka Camp on December 27th and 28th, 1985,and also at Syowa Station in early January, 1986. Although the gravimetric connection was achieved only one way, data analyses were carried out successfully using all other gravity measurements during JARE-27 to detect drift rates and other instrumental parameters. The gravity values at Asuka Camp were relatively determined from the value at Syowa Station within the accuracy of 0.2 mgals. Although it is not satisfactory compared with the recent precise gravity measurements, the accuracy is reasonable considering rather hard situations of the gravity measurements in Antarctica. Another gravity survey was carried out on Rundvagshetta in late January, 1986. Eight gravity stations, including five triangulation stations, one astro-geodetic station and other points, were newly established in the area. The results of the survey were also reported breifly.