Bódy J., Brimich L., Bednarik M. & Mentes Gyula, 2023: Results of the extensometric measurements at the Vyhne tidal station in the year 2021. Acta Geologica Slovaca, 15, 1, 35–38.

Results of the extensometric measurements at the Vyhne tidal station in the year 2021

Jozef Bódi^1,3, Ladislav Brimich¹, Martin Bednárik¹ & Gyula Mentes²

¹Earth Science Institute of the Slovak Academy of Sciences, Dúbravská cesta 9, P. O. Box 106, 840 05 Bratislava, Slovakia; jozef.bodi@savba.sk
²Institute of Earth Physics and Space Science (ELKH EPSS), Csatkai E. u. 6–8, 9400 Sopron, Hungary
³Department of Engineering Geology, Hydrogeology and Applied Geophysics, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovičova 6, 842 15 Bratislava, Slovakia

Abstract

The Vyhne tidal station has been continuously recording tides with a 22.5 m long quartz tube extensometer with a capacitive sensor since 1996. The quartz tube of the instrument was broken by burglars in January 2020. Afterwards, it was repaired and recalibrated. In this paper, we process the data registered in 2021 to verify the correct operation of the repaired instrument. During the evaluation of the data for the year 2021, obtaining a value close to 1 for the amplitude factor of the M2 wave shows that the extensometer is working properly. However, based on both the examination of the raw data and the evaluation of the tide, it can be concluded that due to the external disturbing effects, the determination of the other waves has relatively large errors. Further investigations are needed to find out the reason for this phenomenon.

Key words: Earth tides, strain, temperature effect

Manuscript received: 2023-02-16

Revised version accepted: 2023-05-28