engleski

Quality Evaluation of the Earth's Crust Height Movement Kinematic Model in the Northern Part of the Republic of Croatia

The focus of this paper is the quality evaluation of the relative height movement kinematic model of the Earth's crust that covers the territory of the Republic of Croatia. This model offers necessary data for the calculation of relative vertical displacements and moving speed of Earth's crust discrete points. Consequentially it can be used for reductions in direct levelling measurements from their surveying epoch to another chosen epoch by the elimination of relative height movement effects. As the quality of the model is not yet unambiguously analysed and determined this paper offers kinematic model quality analysis on the northern part of the Croatian territory. In this area, an indirect quality assessment method is used based on levelling measurements accuracy investigation. The measurements accuracy is determined in levelling networks of the 2nd order that almost completely cover the northern part of Croatia. Original levelling measurements from precise levelling network (2nd order state networks) are corrected for the systematic effect of benchmark's relative height movements and reduced from their original survey epochs to the mean epoch of so-called Second High Accuracy Levelling Network (1st order state network). Precise levelling network is investigated simultaneously at the level of original and reduced measurements, comparing "a prior" and "a posterior" measurements accuracy criteria. The result suggests more or less successful elimination of the systematic effect of crustal relative height movements from the levelling measurements. Furthermore, the results confirm the hypothesis that the kinematic model can be reliably used for the determination of regional relative height changes and regional trends in crustal movements within the centimetre level of accuracy.

kinematic model, systematic errors, levelling networks, Earth's crustal height movements

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