Fig. 2: Thermal image sequences of the two paroxysms. Δt indicates time difference from explosion onset.
From: Uncovering the eruptive patterns of the 2019 double paroxysm eruption crisis of Stromboli volcano
a 3 July paroxysm (from SPT camera): #1–#2 fast outflowing of lava occurs simultaneously at the North Sector (NS) and South-Central Sector (SCS), respectively, ~43 s before the paroxysm; #3–#6) explosion onset (at 14:45:43) and radial expansion of the incandescent jet in the following 2 s (14:45:45). For reference, the maximum elevation for ‘normal’ explosions is reported in #1. b 28 August paroxysm (from SQT camera): #1–#5 the progression of the initial blast between 1 s and 26 s after the explosion onset; #6) the flank of Stromboli covered by ‘spatter’ bombs (i.e., fluidal fragments of magma, dashed white lines) 46 s after the paroxysm.
