In a special notice posted on 13 December INSIVUMEH reported that rumbling at Pacaya was heard within a radius of 8 km, and weak Strombolian explosions at Mackenney Crater ejected material as high as 50 m above the crater rim.
Active lava flows were 200-300 m in length and traveled down the NW flank, generating avalanches of blocks that were as large as 1 m in diameter.
The report also noted that the cone in the crater continued to grow, filling the crater, and was 75 m above the crater rim.
During 15-16 December lava continued to flow NW and Strombolian explosions ejected material 5-25 m high.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)