Extensometric observation of Earth tides and local tectonic processes at the Vyhne station, Slovakia

  • Ladislav BRIMICH Earth Science Institute of the Slovak Academy of Sciences
  • Martin BEDNÁRIK Earth Science Institute of the Slovak Academy of Sciences
  • Vladimír BEZÁK Earth Science Institute of the Slovak Academy of Sciences
  • Igor KOHÚT Earth Science Institute of the Slovak Academy of Sciences
  • Dóra BÁN Geodetic and Geophysical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences
  • Ildikó EPER-PÁPAI Geodetic and Geophysical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences
  • Gyula MENTES Geodetic and Geophysical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences
Keywords: Earth tides, extensometric measurements, local effects, tectonic movements

Abstract

The Vyhne Tidal Station of the Earth Science Institute of the Slovak Academy
of Sciences is located in the former mining gallery of St. Anthony of Padua in the Vyhne
valley, Štiavnick´e vrchy Mts., Central Slovakia. It is equipped with a 20.5 metre long
quartz-tube extensometer measuring Earth’s tides, and long-term tectonic deformations
of the Earth’s crust. Data between 2001 and 2015 with some diverse gaps were digitally
collected, processed and analysed. The effects of the local conditions, such as structure
of the observatory, cavity effect, topography and geological features of the surrounding
rocks, were investigated in detail and these effects were taken into consideration during
the interpretation of the results of the data analysis. Tidal analysis of the extensometric
data between 2005 and 2015 revealed that the measured tidal amplitudes are close to the
theoretical values. The tidal transfer of the observatory was also investigated by coherence
analysis between the theoretical and the measured extensometric data. The coherence is
better than 0.9 both in the diurnal and semidiurnal band. The effect of the free core
nutation resonance was also investigated in the case of the K1 and P1 tidal components.
Since the K1/O1 ratio was about the theoretical value 0.8, than the P1/O1 was between
1.0 and 1.15 instead of the theoretical value of 0.9. The rate of the long-term strain
rate was also investigated and the obtained −0.05 μstr/y shows a good agreement with
the strain rate inferred from GPS measurements in the Central European GPS Reference
Network.

Author Biographies

Ladislav BRIMICH, Earth Science Institute of the Slovak Academy of Sciences

Dúbravská cesta 9, 840 05 Bratislava, Slovak Republic

Martin BEDNÁRIK, Earth Science Institute of the Slovak Academy of Sciences

Dúbravská cesta 9, 840 05 Bratislava, Slovak Republic

Vladimír BEZÁK, Earth Science Institute of the Slovak Academy of Sciences

Dúbravská cesta 9, 840 05 Bratislava, Slovak Republic

Igor KOHÚT, Earth Science Institute of the Slovak Academy of Sciences

Dúbravská cesta 9, 840 05 Bratislava, Slovak Republic

Dóra BÁN, Geodetic and Geophysical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences

Csatkai E. u. 6-8., H-9400 Sopron, Hungary

Ildikó EPER-PÁPAI, Geodetic and Geophysical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences

Csatkai E. u. 6-8., H-9400 Sopron, Hungary

Gyula MENTES, Geodetic and Geophysical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences

Csatkai E. u. 6-8., H-9400 Sopron, Hungary

Published
2016-06-30
How to Cite
BRIMICH, L., BEDNÁRIK, M., BEZÁK, V., KOHÚT, I., BÁN, D., EPER-PÁPAI, I., & MENTES, G. (2016). Extensometric observation of Earth tides and local tectonic processes at the Vyhne station, Slovakia. Contributions to Geophysics and Geodesy, 46(2), 75-90. https://doi.org/10.1515/congeo-2016-0006
Section
original research papers