Figure 6
From: Dome-like behaviour at Mt. Etna: The case of the 28 December 2014 South East Crater paroxysm
Strain vs. Distance (a) and vs. Altitude difference (b), between the SEC summit and the borehole dilatometers measuring stations (the data are inferred from figure 8 in Bonaccorso et al.32). Stations are located on the flanks of the volcanic edifice (DPDN, Pizzi Deneri −2800 m a.s.l.; DMSC, Monte Scavo −1740 m a.s.l.; DEGI, Monte Egitto −1600 m a.s.l.; DRUV, Monte Ruvolo −1400 m a.s.l.). The grey lines indicate the contractional (positive) strain during the couple of hours preceding the eruptive event. The black line represents the dilatational (negative) strain during the eruptive event. The two signals have different maximum intensity: the compressive signal is only ~4 microstrain, whereas the dilatational signal reaches ~20 microstrain.
