Fig. 6.

Fresh scoria, pumice and lava particles (500–1000 μm fraction) in ash from the first sub-Plinian event (deposited at Site No. 10 between 18:30 and 19:00 on January 26, 2011; Fig. 1 and Table 1). All are photographs taken under binocular microscope at the same magnification. For definition of each ash component, see Subsection 5.1.1. Both the “fresh pumice” and “fresh scoria” are juvenile. The “fresh lava” particles are glassy and have similar color variation as “fresh pumice” and “fresh scoria”. The “fresh lava” particles have similar petrographical characteristics as pumice and scoria, so these are judged as a part of the erupting magma (Subsection 6.2). Color version available online.