W. J. McGUIRE, J. B. MURRAY, A. D. PULLEN, S. J. SAUNDERS; Ground deformation monitoring at Mt Etna; evidence for dyke emplacement and slope instability. Journal of the Geological Society ; 148 (3): 577–583. doi: https://doi.org/10.1144/gsjgs.148.3.0577
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Ground deformation monitoring at Mount Etna has successfully enabled the sub-surface paths of two shallow feeder-dykes to be traced, and their dimensional parameters, depths and departures from the vertical, to be constrained. Determinations of horizontal movement have recorded the displacement, by 3.6 m (maximum), of a rim segment of the Valle del Bove flank caldera, due to dilation associated with dyke emplacement adjacent to the rim over the period 1981 to 1989. Small-scale collapse along this rim segment, associated with the opening of the 1989 fissure, points to increasing slope instability, and highlights the potential for major failure and debris avalanche generation.