Block-and-ash flows from Santiaguito volcano (image: @ConredGuatemala/twitter)
The activity at the volcano increased since 11 December characterized by moderate-to-strong pyroclastic flows as INSIVUMEH reported.
Actively growing lava dome causes generating the block-and-ash flows likely caused by partially gravitational collapse of the Caliente lava dome.
Soon after the eruption, strong ashfall of fine particles, up to a few mm in size, covered all surfaces in area of Finca Montebello, Loma Linda and San Marcos Palajunoj. Volcanic ash extended about 15-20 km to the southwest of the volcano.
Source: Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología volcano activity update 13 December 2020
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Large ash content caused by pyroclastic flows from Santiaguito volcano (image: @UniversoNews1/twitter)