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Изменение ускорения свободного падения на российских пунктах сравнения абсолютных гравиметров
The article is devoted to the study of changes in the values of gravitational accelerations at the Russian comparison’s sites of the absolute gravimeters “Pulkovo”, “Svetloye” and “Zvenigorod” for the 2007 to 2013 period. Significant increase of the values instead of the expected decrease was obtained. The article attempts to understand the reasons for their increase based on the calculation of the change in the gravitational field using the Bouguer and Faye corrections. The estimates do not fully explain their changes, both according to gravimeters and satellite data. At the sites “Pulkovo” and “Svetloye”, the measured changes in the values differ from the calculated ones by +5,7 and 6,6 µGal, which significantly exceeds the errors of the absolute gravimeters. The change of the gravity differs from the change in the field according to the data of the GRACE satellites by 9.4 µGal at the “Zvenigorod” site. This may be due to not only local hydrological reasons. The "Zvenigorod" site is not only a point of comparison of absolute gravimeters, but also a point of the Moscow gravity network [10], so these reasons should be carefully studied.