Wyniki wyszukiwania - BazTech

1

High precision tilt observation at Mt. Etna Volcano, Italy

Ferro A., Gambino S., Panepinto S., Falzone G., Laudani G., Ducarme B.

Acta Geophysica

|

2011

|

Vol. 59, no. 3

618-632

EN

In 2007-2008, we installed on Mt. Etna two deep tilt stations using high resolution, self-leveling instruments. These installations are a result of accurate instrument tests, site selection, drilling and sensor positioning that has allowed detecting variations related to the principal diurnal and semidiurnal tides for first time on Mt. Etna using tilt data. We analyzed the tidal effects recorded on tilt signals and we removed tidal effects from signals, thereby allowing to detect changes of about 20 nrad with a considerable improvement in respect to the previous installation. Tilt changes have accompanied the Mt. Etna main eruptive phases and are generally related to the rapid rise of magma and formation of dikes and eruptive fissures. However, tilt changes may characterize lava fountains, earthquakes, and inflation-deflation phases. The 2008-2009 eruption represents an example of the potential of the tiltmeters we used, which provides new perspectives for highly precise monitoring of ground deformation on volcanoes.

2

Model pływowy IERS2003 i ocena możliwości jego weryfikacji na podstawie wyników opracowania obserwacji GNSS

Bogusz J., Figurski M.

Biuletyn Wojskowej Akademii Technicznej

|

2010

|

Vol. 59, nr 3

421-441

PL

Niniejszy artykuł zawiera analizę możliwości korekcji pływowego modelu deformacji fizycznej powierzchni Ziemi opartego na standardach IERS2003, a wykorzystywanego w oprogramowaniu Bernese. Autorzy do tego celu wykorzystali stworzoną w Centrum Geomatyki Stosowanej Wojskowej Akademii Technicznej metodę opracowania precyzyjnych obserwacji geodezyjnych w ramach krótkookresowych rozwiązań sieciowych. Jako dane posłużyły obserwacje wykonywane na punktach sieci ASG-EUPOS otrzymane na mocy porozumienia pomiędzy WAT a Głównym Urzędem Geodezji i Kartografii. Analiza pływowa metodą najmniejszych kwadratów potwierdziła, iż model pływowy oparty o parametry matematyczne wymaga wprowadzenia współczynników geodezyjnych, szczególnie w częstotliwościach, które są trudne do zamodelowania, takich jak K1, K2 czy PSI1. W tych częstotliwościach analiza rezyduów obserwacji satelitarnych potwierdziła istnienie kilkumilimetrowych różnic. Otrzymany materiał stanowi świetną podstawę do badań zmian przestrzennych opisywanych parametrów i korelacji ich zmian np. z budową litosfery na terenie Polski.

EN

Present article contains the analysis of the possibility of introducing geodetic corrections to the IERS2003 tidal model. It is the model of the Earth's lithosphere tidal deformations used in the Bernese soft ware. The authors present the method of precise GNSS observations, processing in short-time intervals, which was worked out at the Centre of Applied Geomatics, Military University of Technology. As the data, the geodetic time-series (geocentric coordinates) obtained from satellite observations collected at the ASG-EUPOS sites were used. The tidal analysis based on the least squares method confirmed, that the model based on mathematical parameters requires the implementation of geodetic coefficients, particularly in frequencies which are difficult to be modelled such as K1, K2 or PSI1. In these frequencies, the residuals of satellite observations' analyses confirmed existence of the differences reached several millimetres. The results of this research state the ideal base for further investigations of spatial distribution of tidal deformational parameters and their correlation to the lithosphere's properties.

3

Short-period information in GPS time series

Bogusz J., Figurski M.

Artificial Satellites : Journal of Planetary Geodesy

|

2010

|

Vol. 45, No. 3

119--128

EN

This paper presents results of the Polish Active Geodetic Network (ASGEUPOS) processing. The analyses on the GPS coordinates from sub-diurnal solutions of ASG-EUPOS and EPN data provided by Warsaw Military University of Technology were performed. The aim of this research is to find out how the tidal models used in Bernese software (solid Earth and ocean tides as well) fit to the individual conditions of GPS stations. The 1-hour solution technique of GPS data processing was utilized to obtain coordinates of above 130 Polish and foreign stations. This processing technique allowed us to recognize residual diurnal and sub-diurnal oscillations which could be next utilized for validation of the tidal models used in GPS software.

4

Investigation on tidal components in GPS coordinates

Araszkiewicz A., Bogusz J., Figurski M.

Artificial Satellites : Journal of Planetary Geodesy

|

2009

|

Vol. 44, No. 2

67--74

EN

This paper presents analyses on the GPS coordinates from sub-diurnal solutions of EPN data provided by Warsaw Military University of Technology. The aim of this research is to investigate the way the tidal models used in Bernese software (solid Earth and ocean tides as well) fit to the individual conditions of EPN stations. The 1-hour solution technique of GPS data processing was utilized to obtain coordinates of above 70 EPN stations. Additionally several Polish permanent sites with clearly seen oscillations were examined. This processing technique allowed us to recognize diurnal and sub-diurnal residual oscillations which could be next utilized for validation of the tidal models.

5

Tidal parameters evaluation using wavelet transform

Araszkiewicz A., Bogusz J.

Reports on Geodesy

|

2008

|

z. 2/85

95-104

6

Non tidal plumb line variations observed with help of the long water-tube and horizontal pendulms tiltmetres in Geodynamic Laboratory of PAS in Ksiaz

Kaczorowski M.

Reports on Geodesy

|

2008

|

z. 2/85

79-86

7

Application of the AG measurements to the tidal gravimeter calibration

Bogusz J., Kłęk M.

Reports on Geodesy

|

2008

|

z. 2/85

87-94

EN

The tidal measurements at the Astro-Geodetic Observatory in Jozefoslaw began in 1993 with LaCoste&Romberg G model. Nowadays the Observatory is equipped with ET-26 spring gravimeter. The use of results depends on correct determination of the scale of tidal records which should have relatively high accuracy. The most frequently used method for calibration of tidal gravimeters with more or less regular drift is comparison to the absolute measurements. The repeated absolute gravity measurements with the FG5 No. 230 gravimeter at the Observatory in Jozefoslaw were used for computing calibration factors of the tidal gravimeters using least-squares fitting. The scales of the tidal gravimeters were determined from 8 2-day absolute campaigns performed between October 2006 and May 2007 with the accuracy of about 10%.

8

Environmental influences on gravimetric Earth tides observations

Bogusz J.

Artificial Satellites : Journal of Planetary Geodesy

|

2007

|

Vol. 42, No. 1

41--57

EN

The following article presents the results of the adjustment (by means of the classical least squares method) of 3-year series of gravimetric Earth tides observations recorded in Observatory at Jozefoslaw (Józefosław - Poland) using LaCoste&Romberg model ET-26 gravimeter. The set of atmospheric data (pressure, temperature and humidity) has been taken into account in the analysis. Several models of ocean’s tides were compared to find out how large the indirect effect in Jozefoslaw is. Hydrological observations were made parallel to the gravity storage (soil moisture, water table changes, and rainfalls) to specify its influence to the gravity. Joint adjustment allowed us to determine reliable and precise model of gravimetric Earth tides for Jozefoslaw, which is an indispensable element for every geodynamical observatory. From 3-year data series we were able to obtain parameters (amplitude factor and phase shift) for 31 tidal components. The accuracy of single observation after adjustment (4.2 nm/s2) and the drift (-4.5 nm/s2 per month) are acceptable for this type of equipment. It is worth indicating that these observations are one of the most accurate that have ever been carried out in Poland.