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Spis Castle, a monument included in the UNESCO World Heritage Site list (Eastern Slovakia) is built on a travertine mound overlying soft Paleogene rocks. Lateral spreading resulting from the subsidence of strong upper travertine into soft claystone strata has fractured and separated the castle rock into several cliffs. The differential movement of individual cliff faces is the primary influence on the stability of the monument. In order to monitor and quantify the movement, two techniques were adopted: a mechanical-optical TM-71 crack gauge and a demec gauge (demountable mechanical-SOMET type crack gauge). This paper presents the results and interpretation of medium and short-term monitoring at the site.

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