ИСТИНА

In June-July 2013, a comparison of five absolute gravimeters was conducted at four sites in Russia. The gravimeters in question were the FG5X-221 of the FGI, the FG5-110 and GBL-M 002 of the TsNIIGaiK, GABL-PM of the IAE, and GABL-M of the NIIMorGeofizika (Murmansk, Russia). The three last-mentioned are field-type portable gravimeters made by the Institute of Automation and Electrometry in Novosibirsk. The comparison was conducted at four sites: in Pulkovo and in Svetloe near St. Petersburg, at the TsNIIGaiK laboratory in Moscow, and in Zvenigorod near Moscow. At the TsNIIGAiK site and in Zvenigorod two piers were used, such that altogether six stations were occupied. The FG5X-221 provides a tie to the International Comparison of Absolute Gravimeters (ICAG-2013) in Luxembourg in November 2013. We present the comparison results and discuss the performance characteristics of the different gravimeters.