Volcanic activity worldwide 26 Nov 2013: Merapi, Santa María / Santiaguito, Pacaya, Fuego, Popocat

Etna (Sicily, Italy): No changes in activity have occurred since yesterday. Very occasionally, glow from the summit vent at the NSEC and from a vent at its southern base is visible, suggesting ongoing sporadic deep-seated explosions inside the cone. Tremor is low at the moment.

Ulawun (New Britain, Papua New Guinea): Activity continues. Darwin VAAC reported a small gas and perhaps ash plume at 12,000 ft (3.6 km) altitude this morning.

Sinabung (Sumatra, Indonesia): Ash emissions and explosions continue. So far, about 18,000 people have been evacuated from the most endangered zones in a radius of 5 km around the volcano.

Merapi (Central Java): Particular vigilance should be maintained to monitor the volcano. A large crack, about 230 m long and 50 m wide, has appeared in the lava dome that had been emplaced in the summit crater at the end of the 2010 eruption. It increases the current risk of sudden collapse of the dome, resulting in rock avalanches and dangerous pyroclastic flows. Even a smaller phreatic explosion than the one from 18 Nov could trigger this.


Popocatépetl (Central Mexico): No significant changes in activity have occurred. Only 8 weak emissions / explosions were recorded by CENAPRED during the latest 24 hr observation interval. The attached picture shows the largest of these events.

Santa María / Santiaguito (Guatemala): The INSIVUMEH observatory reports weak to moderate explosions with ash plumes up to 700 m height and constant block avalanches from the rims of the Caliente lava dome, sign that effusive activity has increased somewhat.

Pacaya (Guatemala): Strombolian activity continues, but has been weak over the past days.

Fuego (Guatemala): The lava flow on the upper southern slope was no longer active this morning (while it was still 100 m long yesterday). The volcano is back to its typical mild explosive activity from the summit crater with strombolian bursts generating ash plumes up to about 600 m high, sometimes accompanied by loud shock waves.

Jebel Zubair (Red Sea): Satellite images show signs of ongoing activity (steam plume, discolored water) at the new island at least until 20 November. A satellite image from 24 November shows no such signs any more, suggesting that the activity has stopped or paused.