Abstract
Great volcanic eruptions that eject much dust into the stratosphere are known to change climatic factors,e.g. temperature and solar radiation. It is known, on the other hand, that superimposed on the normal variation in the size of tree-rings is a variation caused by inequalities of climate. Therefore, the notion that tree-rings may preserve the date of several great volcanic eruptions seems probable. In order to support this statement, numerical investigations have been performed. Treering graphs of two Hungarian trees were compared with the chronological order of great volcanic eruptions. The mathematical correlation between the variation of the dust veil index (DVI) is examined, based on two-variate numerical computation.
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