Possible Micrometeorological Anomalies Induced by Volcanic Activity Recorded at Stromboli Island (Aeolian Archipelago, Italy)

Figure 4

Chronogram of the hourly atmospheric pressure ratios between Stromboli and Salina islands (Pr) measured during the study period (April 2011–April 2015), with indication of the 5th and 95th percentiles. Vertical bands describing the volcanic activity state are drawn from literature data [9, 10] and the periodic bulletins emitted by INGV (http://www.ingv.it/it/). The lettered ((a)–(c)) horizontal red bands indicate intervals characterized by different variation styles in Pr signal (see main text for further details).