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On 5 July 2014, an eruptive fissure opened on the eastern flank of Etnavolcano (Italy) at ~3.000 m a.s.l. Strombolian activity and lava effusionoccurred simultaneously at two neighbouring vents. In the following weeks,eruptive activity led to the build-up of two cones, tens of meters high, herenamed Crater N and Crater S. To characterize the short-term (days) dynamics ofthis multi-vent system, we performed a multi-parametric investigation by meansof a dense instrumental network. The experimental setup, deployed on July15-16th at ca. 300 m from the eruption site, comprised two broadbandseismometers and three microphones as well as high speed video and thermalcameras. Thermal analyses enabled us to characterize the style of eruptiveactivity at each vent. In particular, explosive activity at Crater N featuredhigher thermal amplitudes and a lower explosion frequency than at Crater S.Several episodes of switching between puffing and Strombolian activity werenoted at Crater S through both visual observation and thermal data; oppositely,Crater N exhibited a quasi-periodic activity. The quantification of theeruptive style of each vent enabled us to infer the geometry of the eruptivesystem: a branched conduit, prone to rapid changes of gas flux accommodated atthe most inclined conduit (i.e. Crater S). Accordingly, we were able tocorrectly interpret acoustic data and thereby extend the characterization ofthis twovent system.

Time-series analysis of fissure-fed multi-vent activity: a snapshot from the July 2014 eruption of Etna volcano (Italy)