Report on Santa Maria (Guatemala) — 29 June-5 July 2022
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
29 June-5 July 2022
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2022. Report on Santa Maria (Guatemala). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 29 June-5 July 2022. Smithsonian Institution and US Geological Survey.
14.757°N, 91.552°W; summit elev. 3745 m
All times are local (unless otherwise noted)
INSIVUMEH reported that the eruption at Santa María’s Santiaguito lava-dome complex continued during 29 June-5 July. Incandescence from Caliente crater and the lava flows on the W and SW flanks was visible nightly. Lava flows continued to advance in the San Isidro channel and were 3 km long by 1 July. Block avalanches from the ends and sides of the flows that descended the S, SW, and S flanks. Ash from these avalanches sometimes produced ash curtains and ashfall around the volcano.
Geological Summary. Symmetrical, forest-covered Santa María volcano is part of a chain of large stratovolcanoes that rise above the Pacific coastal plain of Guatemala. The sharp-topped, conical profile is cut on the SW flank by a 1.5-km-wide crater. The oval-shaped crater extends from just below the summit to the lower flank, and was formed during a catastrophic eruption in 1902. The renowned Plinian eruption of 1902 that devastated much of SW Guatemala followed a long repose period after construction of the large basaltic-andesite stratovolcano. The massive dacitic Santiaguito lava-dome complex has been growing at the base of the 1902 crater since 1922. Compound dome growth at Santiaguito has occurred episodically from four vents, with activity progressing W towards the most recent, Caliente. Dome growth has been accompanied by almost continuous minor explosions, with periodic lava extrusion, larger explosions, pyroclastic flows, and lahars.