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Tectonic plates parameters estimated in International Terrestrial Reference Frame ITRF2008 based on DORIS stations

Kraszewska K., Jagoda M., Rutkowska M.

Acta Geophysica

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2018

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Vol. 66, no. 4

509--521

EN

This paper concerns an analysis of the accuracy of the estimated parameters X (U, K, x) which define the tectonic plate motions. The study is based on the velocities of station positions in the IERS (International Earth Rotation and Reference Systems Service) which has published new realization of the International Terrestrial Reference System—ITRF2008 for Doppler Orbitography by Radiopositioning Integrated on Satellite DORIS technique. Eurasian, African, Australian, North American, Australian, Pacific, Antarctic and South American plates were used in the analysis. The influence of the number and localization of stations on the plate surface on the estimation accuracy of the tectonic plate motion parameters were discussed. The results were compared with the APKIM 2005 IGN model and our earlier estimation for the SLR technique. In general, a remarkable concurrent agreement between the present and the APKIM 2005 solutions was found.

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Ocena zmiany w czasie liczb Love’a k2 i k3 na podstawie danych SLR satelitów LAGEOS

Jagoda M., Rutkowska M., Kraszewska K.

Biuletyn Wojskowej Akademii Technicznej

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2017

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Vol. 66, nr 3

83--98

PL

W pracy wyznaczono liczby Love’a dla pływów drugiego i trzeciego stopnia (liczby k2 i k3). Wyznaczenie przeprowadzono na podstawie danych SLR satelitów LAGEOS-1 i LAGEOS-2 za okres 1.01.2014-1.01.2016. Uzyskane wyniki porównano z naszym wcześniejszym wyznaczeniem dla okresu 1.01.2005-1.01.2007 w celu oceny ich zmiany w czasie oraz wskazania ewentualnych zmian systematycznych. Otrzymane wartości parametrów k2 i k3 wynoszą odpowiednio: 0,29867±0,0001 i 0,0898±0,0047 (dane LAGEOS-1) oraz 0,29858±0,0001 i 0,0867±0,0047 (dane LAGEOS-2). Różnią się one od wartości uzyskanych w naszej poprzedniej pracy [25] o –0,00293 (dane LAGEOS-1) i –0,00202 (dane LAGEOS-2) dla liczby k2 oraz o –0,0091 (dane LAGEOS-1) i 0,0057 (dane LAGEOS-2) dla liczby k3. Różnice te mogą wskazywać na wystąpienie zmiany w czasie wartości k2 i k3.

EN

In this paper, we present the estimated Love numbers for degree 2 and 3 (k2 and k3). The determination was based on the Satellite Laser Ranging (SLR) data of LAGEOS-1 and LAGEOS-2 satellites obtained within the period of January 1, 2014 until January 1, 2016. The results were compared with our previous determination of these parameters for the period from January 1, 2005 until January 1, 2007 to examine whether any systematic differences and time evolution occur. The adjusted values for the k2 and k3 parameters are, 0.29867±0.0001 and 0.0898±0.0047 (LAGEOS-1 data), respectively and 0.29858±0.0001 and 0.0867±0.0047 (LAGEOS-2 data). The discrepancies between the k2 and k3 values obtained in our previous paper [25] and this analysis are: –0.00293 (LAGEOS-1 data) and –0.00202 (LAGEOS-2 data) for k2 and –0.0091 (LAGEOS-1 data) and 0.0057 (LAGEOS-2 data) for k3. The obtained discrepancies in the k2 and k3 values may indicate their change over time.

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Tectonic Plate Parameters Estimated in the International Terrestrial Reference Frame ITRF2008 Based on SLR Stations

Kraszewska K., Jagoda M., Rutkowska M.

Acta Geophysica

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2016

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Vol. 64, no. 5

1495--1512

EN

This paper concerns an analysis of the accuracy of estimated parameters Ω (Φ, Λ, ω) which define the tectonic plate motions. The study is based on the velocities of station positions published by ITRF2008 for Satellite Laser Ranging (SLR) technique. The Eurasian, African, North American and Australian plates were used in the analysis. Influence of the number and location of stations on the plate surface on estimation accuracy of the tectonic plate motion parameters was discussed. The results were compared with the APKIM 2005 IGN model. In general, a remarkable concurrence agreement between our solutions and the APKIM 2005 model was found.

4

Ewolucja modeli pola grawitacyjnego uzyskanych na podstawie misji satelitarnych

Kraszewska K., Kozakiewicz M.

Materiały Budowlane

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2013

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nr 11

65--66

PL

W artykule zaprezentowano wyznaczanie modeli pola grawitacyjnego z wykorzystaniem misji satelitarnych: GOCE, GRACE i CHAMP i pokazano, jak pomiary satelitarne wpłynęły na dokładność wyznaczenia kolejnych modeli w skali całego globu oraz obszaru południowej Europy.

EN

This article shall determine the subject matter of the gravity field models using satellitemissions: GOCE, GRACE and CHAMP. As shown in the satellite measurements affect the precision of the following models for the entire world and for the area of southern Europe.