Preliminary analysis of the connection between ocean dynamics and the noise of gravity tide observed at the Sopronbánfalva Geodynamical Observatory, Hungary
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Tartalom: http://www.sciencedirect.com/science/article/pii/S0264370...
Archívum: MTA Könyvtár
Gyűjtemény: Status = Published

Type = Article
Cím:
Preliminary analysis of the connection between ocean dynamics and the noise of gravity tide observed at the Sopronbánfalva Geodynamical Observatory, Hungary
Létrehozó:
Papp, Gábor
Szűcs, E.
Battha, L.
Dátum:
2012
Téma:
QE03 Geodynamics / geodinamika
Tartalmi leírás:
An experimental development of a computer controlled photoelectric ocular system applied for the
LaCoste and Romberg G949 gravimeter made the continuous observation of time variation of gravity possible.
The system was operated for half a year in the Sopronbánfalva Geodynamical Observatory to test
its capabilities. The primary aim of this development was to provide an alternative and self-manageable
solution for the standard electronic (Capacitive Position Indicator) reading of this type of gravimeter
and use it for the monitoring of Earth tide. It, however, turned out that this system is sensitive enough
to observe the effect of variable seismic noise (microseisms) due to the changes of ocean weather in
the North Atlantic and North Sea regions at microGal level (1 ?Gal = 10?8 m/s2). Up to now not much
attention was paid to its influence on the quality and accuracy of gravity observations because of the
large distance (>1000 km) between the observation place (generally the Carpathian?Pannonian basin)
and the locations (centres of storm zones of the northern hydrosphere) of triggering events. Based on
an elementary harmonic surface deformation model the noise level of gravity observations was compared
to the spectral characteristics of seismic time series recorded at the same time in the observatory.
Although the sampling rate of gravity records was 120 s the daily variation of gravity noise level showed
significant correlation with the variation of spectral amplitude distribution of the analysed high pass filtered
(cut-off frequency = 0.005 Hz) seismograms up to 10 Hz. Also available daily maps of ocean weather
parameters were used to support both the correlation analysis and the parameterization of the triggering
events of microseisms for further statistical investigations. These maps, which were processed by
standard image processing algorithms, provide numerical data about geometrical (distance and azimuth
of the storm centres relative to the observation point) and physical (mass of swelling water) quantities.
The information can be applied for characterizing the state of ocean weather at a given day which may
help the prediction of its influence on gravity measurements in the future. Probably it is the first attempt
to analyse quantitatively the effect of ocean weather on gravity observations in this specific area of the
Carpathian?Pannonian region.
Típus:
Article
PeerReviewed
Formátum:
text
Azonosító:
Papp, Gábor and Szűcs, E. and Battha, L. (2012) Preliminary analysis of the connection between ocean dynamics and the noise of gravity tide observed at the Sopronbánfalva Geodynamical Observatory, Hungary. Journal of Geodynamics, 61. pp. 47-56. ISSN 0264-3707
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