The Establishment of a Vertical Gravity Calibration Baseline in Tatra Mountains, New Adjustment of the Polish Gravity Control Network

摘要

In October 2004, the Polish gravity control network, containing 354 gravity field stations and 12 stations for absolute gravity measurements, was enlarged by one more absolute station in Zakopane, at the foothills of the Tatra Mountains. The absolute station was also established at the Tatra Meteorological Observatory on Kasprowy Wierch. Both new stations will constitute the vertical gravity calibration baseline (of the range of about 248 mGal), which is indispensable for research of mountain dynamics. The absolute measurements have been performed together with the Finnish Geodetic Institute using the ballistic gravimeter FG5 No. 221. At both stations the mean errors of measurements have not exceeded ±3 mGal. Establishing the new station in Zakopane has made possible to extend the Central Gravity Calibration Baseline Gdansk - Borowa Gora - Ojcow to the southern border of the country and thereby to cover the whole Polish territory with its range. The absolute gravity station in Zakopane has been tied to three neighbouring field stations of the gravity control network. Besides, two more gravity stations, one in Kuznice and the other one in Warsaw were established. They were tied to the existing gravity control with relative gravity measurements. The new adjustment (2004) of the Polish gravity control network, with use new absolute and relative gravity survey on the sites at Zakopane, Kuznice and Warsaw has been performed.