Monitoring of the long-standing changes of the absolute gravity in Observatory of Józefosław and at main tectonics units of Poland territory

• Autorzy: Barlik M. , Olszak T. , Pachuta A. , Próchniewicz D.
• Konferencja: Geomatic and Geodynamic Programmes of the Central Europe / Proceedings of the EGU G16 Symposium (19-24. 04. 2009; Vienna, Austria)
• Języki publikacji: EN

Abstrakty

EN

Gravimetric investigations of the long-standing, not tidal variations of the absolute gravity using ballistic FG - 5 No. 230 gravity meter, bought by Warsaw University of Technology at 2005, were performed on four stations outside the Teisseyre - Tornquist Zone (T - T Zone) as well as at Józefoslaw Astro - Geodetic Observatory of the Warsaw University of Technology, located near Warsaw, near the northern edge of T - T zone on Precambrian Platform. Raw results of observations were corrected by Earth's tide influences, loading effects of the Earth's crust and ocean, by polar motion influence to the gravity as well as from the reason of gravitational and deformation influences of the atmosphere. Monitoring of the gravity on Józefosław station, during three years once a month, pointed out quasi-periodic non-tidal variations. Absolute gravity determinations in previous campaigns (1992 - 2001) on Polish territory were performed using various ballistic gravity meters, many types and quality, as well as there were spread in time. In epochs since 2006 to 2008 with our instrument FG - 5 No. 230 there were obtained the gravity values minor on all investigated stations. It was about 17 žGal on Satellite Lamkówko station, near Olsztyn, and 12 žGal in Borowiec Astro Geodynamical Observatory of the Space Research Centre, Polish Academy of Sciences with comparison to the results from 8 - 10 y earlier obtained using Polish absolute gravity meter ZZG, Italian IMGC and two FG-5 instruments from Austria and USA. The variation since 1996 to 2006 on Giby (station of the gravity national fundamental net) was appeared as only 7.5 žGal. On very stable station Ojców (Seismic Observatory of the Polish Academy of Sciences) located on Świętokrzyskie Mts. craton, the decrease of gravity equal to 9 žGal has been noticed after 9 years. Recovered variations of gravity on Poland territory might have the sources in gravity global or regional variations in the hydrological influences in the vicinity of stations as well as in incorrect earlier determinations of the gravimetric corrections, mainly in vertical gradient of gravity above absolute stations.

Słowa kluczowe

EN

Astronomical-Geodetic Observatory in Józefosław; gravimetric measurements

PL

Obserwatorium Astronomiczno-Geodezyjne w Józefosławiu; pomiary grawimetryczne

• Wydawca: Wydział Geodezji i Kartografii Politechniki Warszawskiej
• Czasopismo: Reports on Geodesy
• Rocznik: 2009
• Tom: z. 1/86
• Strony: 61--68
• Opis fizyczny: Bibliogr. 6 poz., rys., wykr.

Twórcy

autor

Barlik M.

autor

Olszak T.

autor

Pachuta A.

autor

Próchniewicz D.

• Faculty of Geodesy and Cartography, Department of Geodesy and Geodetic Astronomy, Warsaw University of Technology

Bibliografia

• 1. Kowalczyk K.: Modeling the vertical movements of the Earth’s crust with the help of the collocation method. 8 Bilateral Poland-Italy Geodetic Meeting, Wrocław.
• 2. Książkiewicz M., Samsonowicz J., (1953): Zarys geologii Polski. Państwowe Wydawnictwo Naukowe. Warszawa.
• 3. Pożaryski W., (1959): Budowa geologiczna Polski. Wydawnictwa Geologiczne. Warszawa.
• 4. Sas-Uhrynowski A., (2002): Absolute gravity measurements in Poland. Institute of Geodesy and Cartography, Monographic Series, No. 3, Warsaw.
• 5. Ząbek Z., (1996): The transportable ballistic gravimeter ZZG. Reports on geodesy, No. 3(21), Warsaw University of Technology, Institute of Geodesy and Geodetic Astronomy, Warsaw.
• 6. Ząbek Z., Kiełek W., Knap T., (2001): Long-period Earth gravity changes at main tectonic units of Poland's territory. XXVI General Assembly of European Geophysical Society, Nice, France.