Abstract
Abstract In the north-eastern part of Hungary, in the vicinity of the Josvafo Karst Research Station, there are two karstic springs of siphonal eruption. On the basis of the periodicity of the eruptions, it can be assumed that water yield may be influenced by a tidal phenomenon of the karstic water level. Systematic measurements and their manifold interpretations have proved the correctness of this assumption. The narrowing-widening of the lithoclases of the water-bearing strata was measured simultaneously with spring measurements. A close relationship was found to exist between the variation of gravity and the changes in the size of the lithoclases; the results providing information on tidal phenomena occurring in the solid crust. At the same time, it has been ascertained that the influence of the variation of the gravitation field can be shown to have affected the yield of non-siphonal karstic springs as well.
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