Fig. 2.

Temporal change of ash components during 2011 eruption (January 19–August 31) and its precursory stage (August 2008–May 2010). For definition of each component, see Subsection 5.1.1. Original percentage data and total number of particles counted are listed in Table 2. Target size was either 250–500 μm or 350–500 μm (two samples of August 22, 2008), except for 6 samples with star (*); January 26, 14:30, 125–500 μm; January 26, ca. 19:00, 500–1000 μm; April 18, 500–1000 μm; June 16, ca. 100 μm; June 23, 125–250 μm; August 6, 125–250 μm (Table 1). Two samples of August 22, 2008 can be distinguished by Site No. (also shown in Fig. 1 and Table 1). Rose-colored bars represent particles that came directly from 2011 magma (6.2; Table 2). Unlike the vulcanian stage, lava particles from the second phreatomagmatic stage (June 16 to August 31, 2011) were not classified further, because of possible alteration of lava accumulated in the crater (second phreatomagmatic stage in 5.1.2). Color version available online.