For evaluation purposes, we have carried out relative gravity measurement with the relative spring gravimeter
LaCoste&Romberg model G on 8 stations of the network.
In processing data obtained during the relative gravimetric survey, we considered the influence of air pressure, the movement of Poles and short-time gravimeter
and Xiaoping, K.: 2006, Wavelet filter analysis of splitting and coupling of seismic normal modes below 1.5 mHz with superconducting gravimeter
records after December 26, 2004 Sumatra earthquake.
and Rogowski, J.: 2011, On consistence of seasonal crustal deformation derived from GRACE data and hydrology models and measured by GPS and absolute gravimeter
at the Jozefoslaw Observatory in Poland.
It has been set up in the spring of 1993 using concrete pillars with heads for forced centering of satellite antenna and for placing gravimeters
during epoch measurements.
The instrumentation of the Geodetic Observatory Pecny was upgraded and extended by the superconducting gravimeter
OSG-050, the microwave water vapor radiometer TP/WVP-3000 of Radiometrics Inc., USA and the 3-D very broad-band seismometer GURALP CMG-3TD installed in a deep borehole at the GOP.
However, it will be shown, that such a value represents only the precision of the FG5#215 gravimeter
, because it does not reflect many of errors acting during the measurement.
Number Precision Scintrex Autograv CG-5 10125 2.1 [+ or -] 1.1 [micro]Gal LaCoste & Romberg 1068 8.9 [+ or -] 4.2 [micro]Gal The precision in table means an average root mean square error for one measurement in one typical day unit.
The gravity measurements with the relative gravimeter
Scintrex CG-5 were carried out in three periods, while the third period was divided in two time intervals:
* metal gravimeter
La Coste & Romberg, model G, for which the read-outs were made by the interpolation method with an external volt meter,