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Authors: Mazzarini, F.*
Favalli, M.*
Isola, I.*
Neri, M.*
Pareschi, M. T.*
Title: Surface roughness of pyroclastic deposits at Mt. Etna by 3D laser scanning
Title of journal: Annals of Geophysics
Series/Report no.: 5-6/51 (2008)
Publisher: Istituto Nazionale di Geofisica e Vulcanologia
Issue Date: Oct-2008
Keywords: surface roughness
pyroclastic deposits
Laser 3D
Mount Etna
Abstract: The terrestrial 3D Laser Scanning technique has been applied to analyse the surface roughness of pyroclastic deposits on volcanic surfaces at Mt. Etna. This technique allowed the construction of high accuracy digital elevation models of small surfaces, about 1 m across. Sampled surfaces differ for percentage of coverage and for grain size of the pyroclastic deposits. The change in grain size distribution for the pyroclastic unconsolidated deposits affects the surface roughness. The roughness of the site where the finest pyroclastic deposits occur is mainly governed by large scale wavelength morphology (Hurst exponent H = 0.77 for lengths larger than 16 mm). The other sampled surfaces have self-affine characters with low (0.15) to intermediate (0.35 - 0.38) Hurst exponents for lengths higher than 10 – 22 mm. Here we show results of the analysis of the surface roughness of the pyroclastic deposits emplaced during the 2001 and 2002-2003 eruptions at Mt. Etna. Grain size and thickness of pyroclastic deposits mainly control the overall roughness of such as volcanic surface.
Appears in Collections:Papers Published / Papers in press
Annals of Geophysics
04.04.99. General or miscellaneous
04.04.03. Geomorphology
04.04.10. Stratigraphy
04.04.11. Instruments and techniques
04.08.99. General or miscellaneous
04.08.05. Volcanic rocks
04.08.07. Instruments and techniques
05.02.03. Volcanic eruptions

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