Bulletin of Volcanology

, Volume 62, Issue 6–7, pp 420–430 | Cite as

Flank Cones at Mount Etna Volcano: Do they have a power-law distribution?

  • Francesco Mazzarini
  • Pietro Armienti
Research Article

Abstract.

Mount Etna is currently characterised by intense effusive and explosive activity of its summit vents, whereas 319 non-active Holocene flank cones are spread across its flanks at altitudes of between 2990 and 475 m. In volcanic areas the relationships between fracture occurrence and cone growth/location are well established. With this in mind, the spatial distribution of the Mount Etna flank cones was analysed in order to make some inferences about the fracture systems that feed the cones. The positions of the flank cones were acquired by the use of a digital elevation model of the volcano with a geometric resolution of 10×10 m. Spatial distribution of the cones was analysed through counting-box and sand-box methods, checking for fractal or multifractal behaviours. The four data sets analysed consist of the whole number of parasitic cones (319), and cones located on the NE (50), south (143) and west (61) rifts, respectively. The cones have a non-trivial power-law distribution. The sand-box method gave the best results with a fractal exponent Df for all cones of 1.41±0.02 over the length range 0.2–10 km. The same analysis was performed on the other data sets: South Rift (1.42±0.02); West Rift (1.39±0.02); and NE Rift (1.43±0.02). The cones do not have a multifractal distribution, as suggested also by the strong similarity between fractal exponents of the different data sets. Data suggest a strong control over flank cone distribution by fracture length and density. These two characteristics are, in turn, expressions of highly connected fractures activated as magma feeders by the volcano's present stress field. We interpret the rifts as inherited structures that represent preferential sites of fracture connectivity.

Flank cones Fractal distribution Fracture systems Etna 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag 2000

Authors and Affiliations

  • Francesco Mazzarini
    • 1
  • Pietro Armienti
    • 2
  1. 1.CNR-Centro di Studio per la Geologia Strutturale e Dinamica dell'Appennino, Via S. Maria 53, Pisa, ItalyItaly
  2. 2.Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, Pisa, ItalyItaly

Personalised recommendations