Fig. 4

Timescales of eruption for four eruptions (three paroxysmal and one effusive) of Fuego in the 2015–2018 eruptive cycle. Eruptions are the same as those plotted in Fig. 2. Transitions between eruptive styles and related times are derived from INSIVUMEH Special Bulletins. Paroxysmal climax periods are constrained by times given in Special Bulletins. The three paroxysms show large behavioral differences, for example in the duration of increased explosivity and if/when PDCs are generated. The November 2017 effusive eruption was distinct in not producing a sharp uptick in RSAM, although like the paroxysms it did produce lava flows and like the September 2016 paroxysm it did not produce PDCs