INSIVUMEH reported on 6 February that avalanches from lava flows on the W flank of Santa María’s Santiaguito lava dome complex continued. Explosions produced ash-and-steam plumes that rose to an altitude of 3.9 km (12,800 ft) a.s.l. On 8 February, a strong phreatic explosion produced an ash plume that rose to an altitude of 4.7 km (15,400 ft) a.s.l. and caused ashfall in areas 4 km to the SW. Collapsing blocks of lava on the SW flank resulted in steam-and-ash plumes. On 12 and 18 February, lava flows on the S and SW flanks and avalanches of blocks that originated from the edge of the crater were noted. On 15, 18, and 19 February, explosions produced ash plumes that rose to altitudes of 4.6-4.7 km (15,100-15,400 ft) a.s.l. Ashfall was reported from areas 4 km to the SW on 15 February.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH) – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.”