*4.3. Pyroclastic Density Currents*

The PDC deposits from the eruption were mapped visually and are shown in Figure 6. The PDC material in Barranca Las Lajas and El Jute covers an area of 1.24 km2. The second PDC deposited in Barranca Honda covered an area of 0.43 km2. The use of automated methods (e.g., NDVI or other indices or single band differences) to delineate the deposits was not successful for the whole deposit in any of the barrancas, due to the lack of pre-existing vegetation in these zones. Figure 7 demonstrates the value of high spatial resolution PS imagery for identifying morphological changes associated with eruptive activity. A scar located SE of the Fuego vent region in the upper reaches of Barranca Honda indicates erosion and/or collapse of the steep upper flanks. The orientation of the scar suggests that the derived material must have contributed to the PDC emplaced in barranca Honda.

**Figure 6.** PDC deposits in (**a**) Barranca Honda and (**b**) Barranca Las Lajas and El Jute visually mapped using PlanetScope imagery. The inset shows the location of the displayed area. Background image is from February 2, 2018 at 15:57 UTC.

**Figure 7.** PlanetScope images of Fuego collected on January 9, 2018 at 16:57 UTC and February 2, 2018 at 15:57 UTC, showing morphological changes pre- (**a**) and post-eruption (**b**). The February 2 PlanetScope image (**c**) shows the presence of a scar formed during the February 2018 paroxysm, in the upper reaches of Barranca Honda.
