Research on absolute gravity variations in geodynamic laboratory in Książ in the period of 2007-2011

• Autorzy: Kaczorowski M. , Olszak T. , Walo J. , Barlik M.

Identyfikatory

DOI

10.2478/v10018-012-0022-x

• Języki publikacji: EN

Abstrakty

EN

In 2006 a gravimetric pavilion was installed inside the Geodynamic Laboratory (LG) in Książ. The pavilion was equipped with two pillars intended to serve relative and absolute gravimetric measurements. Installation of measurement platform for absolute gravity measurements inside gravimetric pavilion of LG made it possible to perform four sessions of absolute gravity measurements: two of them in 2007 (June 10-12 and Nov. 21-22), one in 2008 (Apr. 21-22) and one in 2011 (June 19-21). In 2007 the absolute measurements were performed using two FG5 ballistic gravimeters. In April 2007 the measurements were performed by Dr Makinen from Geodetic Institute of Finnish Academy of Science with application of FG5 No. 221 absolute gravimeter. In June 2007 and in the years 2008 and 2011 such gravimetric measurements were performed by the team from Department of Geodesy and Astronomical Geodesy of Warsaw University of Technology using FG5 No. 230 absolute gravimeter. Elaboration of observation sessions from both gravimeters was performed in the Department of Higher Geodesy following the procedures used in constituting of uniform gravimetric system of geodynamic polygons reference. This constituting of gravimetric system comprised inter alia application of identical models of lithospheric tides (global model by Wenzel, 1997) and ocean tides (Schwiderski, 1980) (reduction of absolute measurements with tidal signals). Observations performed during summer of 2007, autumn of 2007, and spring of 2008 and 2011 indicated existence of small changes of absolute gravity of the order of 1 Gal. Maxima of accelerations appear in the spring period, and minima in the autumn period. This effect is connected with the influence of global hydrological factors the annual amplitude of which is ca 1,5 Gal and achieve extreme values in the spring-autumn interval. Very small value of observed amplitude of gravity changes in the period of extreme variability suggests that the observed gravity changes in LG are caused only by global phenomenon. This proves high degree of „independence” of gravimetric measurement base in LG from the local environmental factors such as ground water level variations, ground humidity, impact of snow cover, etc. At this moment the instrumental environment of absolute measurements obtains particular value, especially in the case of the tiltmeters and relative the gravimeter Lacoste&Romberg (LR-648). The relative gravity measurements as performed simultaneously with absolute gravity measurements enable us to determine the local tidal ephemeredes which makes it possible to replace the global tidal modal with ocean tidal model with the more realistic, locally determined tidal parameters (the local tidal ephemeredes).

Słowa kluczowe

EN

gravity measurements; gravimeter; direct tides; indirect tides; tidal modelling

• Wydawca: Centrum Badań Kosmicznych PAN ; De Gruyter
• Czasopismo: Artificial Satellites : Journal of Planetary Geodesy
• Rocznik: 2012
• Tom: Vol. 47, No. 4
• Strony: 169--176
• Opis fizyczny: Bibliogr. 9 poz., rys., tab.

Twórcy

autor

Kaczorowski M.

• Space Research Centre, Polish Academy of Sciences, Bartycka 18A, 00-716 Warsaw, Poland

autor

Olszak T.

• Department of Geodesy of Warsaw University of Technology, Pl. Politechniki 1, 00-661Warszawa, Poland

autor

Walo J.

• Department of Geodesy of Warsaw University of Technology, Pl. Politechniki 1, 00-661Warszawa, Poland

autor

Barlik M.

• Department of Geodesy of Warsaw University of Technology, Pl. Politechniki 1, 00-661Warszawa, Poland

Bibliografia

• Francis O., T. van Dam, A. Germak, M. Amalvict, R. Bayer, M. Bilker-Koivula, M. Calvo, G.-C. D’Agostino, T. Dell’Acqua, A. Engfeldt, R. Faccia, R. Falk, O. Gitlein, M. Fernandez, J. Gjevestad, J. Hinderer, D. Jones, J. Kostelecky, N. Le Moigne, B. Luck, J. Mäkinen, D. Mclaughlin, T. Olszak, P. Olsson, A. Pachuta, V. Palinkas, B. Pettersen, R. Pujol, I. Prutkin, D. Quagliotti, R. Reudink, C. Rothleitner, D. Ruess, C. Shen, V. Smith, S. Svitlov, L. Timmen, C. Ulrich, M. Van Camp, J. Walo, L. Wang, H. Wilmes and L. Xing.,2010, Results of the European Comparison of Absolute Gravimeters in Walferdange (Luxembourg) of November 2007. Gravity, Geoid and Earth Observation, Springer Berlin Heidelberg, Ed. Stelios, P. Mertikas, vol. 135, 31-35, 2010.
• Kaczorowski, M., 2006, High-Resolution Wide-Range Tiltmeter: Observations of Earth Free Oscillations Excited by the 26 December 2004 Sumatra - Andaman Earthquake. Monograph: - Earthquake Source Asymmetry, Structural Media and Rotation Effects. pp. 493-520, Springer-Verlag Berlin Heidelberg.
• Kaczorowski M., 2008, Non-tidal plumb line variations observed with help of the long watertube and horizontal pendulums tiltmeters in Geodynamic Laboratory of PAS in Ksiaz, Reports on Geodesy, No.2 (85) pp79-86.
• Kaczorowski M., J. Wojewoda, 2011, Neotectonic activity interpreted from a long water-tube tiltmeter record at the SRC Geodynamic Laboratory in Książ, Central Sudetes, SW Poland, Acta Geodyn. Geomater. Vol. 8, No. 3 (163).
• Olszak, T., J. Walo, D. Próchniewicz, 2010, Metodyka wyznaczania wartości przyspieszenia siły ciężkości w realizacji jednolitego grawimetrycznego układu odniesienia. Monografia „Jednolity system grawimetrycznego odniesienia polskich stacji permanentnych GNSS i poligonów geodynamicznych pod redakcją J. Walo, Oficyna Wydawnicza PW, Warszawa, 2010.
• Schwiderski E W. 1980, Ocean tides: a hydrodynamic interpolation model, Marine Geodesy, 3, 219-255.
• Walo, J, Pachuta A., Próchniewicz D., Olszak T., Szpunar R. 2010, Jednolity system grawimetrycznego odniesienia polskich stacji permanentnych GNSS i poligonów geodynamicznych, pod redakcją J. Walo, Oficyna Wydawnicza PW, Warszawa.
• Wenzel, H.-G. 1997, Estimation of accuracy for the earth tide analysis results. Bulletin d'Informations Marees Terrestres, vol. 76, 4427-4445, Bruxelles.
• Wziontek, H. Wilmes, P. Wolf, S. Werth, A. Güntner 2009, Time series of superconducting gravimeters and water storage variations from the global hydrology model WGHM, Journal of Geodynamics, Volume 48, Issues 3-5, December 2009, Pages 166-171.

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).