Fig. 1: Map of Stromboli Island and location of the explosive activity.
From: Uncovering the eruptive patterns of the 2019 double paroxysm eruption crisis of Stromboli volcano
a Map of Stromboli Island with the location of Stromboli Pizzo Thermal surveillance camera (SPT, magenta star), portable high-frequency thermal camera (HFT, green star) at Pizzo Sopra la Fossa (918 m a.s.l.), and the Stromboli ‘Quattrocento’ (~400 m a.s.l.) Thermal and Visible cameras (SQT and SQV, yellow star) along the Sciara del Fuoco. The field of view of the crater terrace (dashed ellipse) of each camera is indicated by triangles. Gray areas: Stromboli and Ginostra villages. b Total hourly explosive frequency (HEF) per day in the period 1 January-30 September 2019, zoomed in the period 1 June-30 September for North Sector (NS) and South-Central Sector (SCS), respectively. Colored areas denote periods of medium (HEF ranging 5–15, yellow), high (HEF 15–25, orange), or very high (HEF > 25, red) activity levels. c, d, e Still frames from HFT video surveys from Pizzo on 9 May, 28 July and 7 September 2019, respectively, showing the morphology variations due to the two paroxysms and color-coded for the temperature scale (from blue to yellow tones marking increasing relative temperature). Numbers after letters indicate the different active vents in the N and SC sectors.
