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The borehole dilatometer network of Mount Etna: A powerful tool to detect and infer volcano dynamics
Author(s) -
Bonaccorso A.,
Linde A.,
Currenti G.,
Sacks S.,
Sicali A.
Publication year - 2016
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1002/2016jb012914
Subject(s) - lava , borehole , geology , volcano , dilatometer , magma , seismology , volume (thermodynamics) , signal (programming language) , geodesy , geotechnical engineering , thermal expansion , materials science , physics , quantum mechanics , computer science , programming language , metallurgy
A network of four borehole dilatometers has been installed on Etna in two successive phases (2010–2011 and 2014). The borehole dilatometers are installed in holes drilled at depths usually greater than 100 m, and they measure the volumetric strain of the surrounding rock with a nominal precision up to 10 −11 in a wide frequency range (10 −7 –25 Hz). Here we describe the characteristics of the network and the results of the in situ calibrations obtained after the installations by different methods. We illustrate short‐term strain changes recorded during several lava fountains erupted by Etna during 2011–2013, and we also show signal changes recorded at all four stations during the lava fountain on 28 December 2014. Analytical and numerical computations constrained the eruptions source depth and also its volume change that is related to the magma volume emitted. Finally, we show the potential of the signal in the medium term to reveal strain changes related to different phases of the volcanic activity.