Continuous gravity measurement with a superconducting gravimeter (SG) has been conducted at Syowa Station since a first installation of SG TT-70#016 with a 10K cryocooler in 1993, and the observed data have been applied to various studies as the only SG continuous gravity observation in the Antarctica. The SG TT-70#016 had been replaced by a SG CT#043 with a 4K cryocooler in 2003. The gravity data obtained from the SG CT#043 were contaminated by a large instrumental drift and cryocooler’s noise. In addition, we were unable to maintain the cryocooler of SG CT#043 because of its manufacturer bankruptcy. Then, the SG CT#043 was renewed to a new SG OSG#058 with a 4K cryocooler (Sumitomo Heavy Industries, Ltd.) during Dec. 2009 - Jan. 2010. In this period, the SG OSG#058 was also calibrated by absolute gravimeters.

After the renewal, the SG data obtained at Syowa Station are delivered to Japan by FTP protocol via the INTELSAT communication link everyday.