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Volcanic activity world-wide 27 September 2012: Marapi, Fuego, Santiaguito, Pacaya, Popocatépetl, San Miguel, Montserrat, Little Sitkin, Bagana, Dukono, Batu Tara

Thursday Sep 27, 2012 09:41 AM | BY: T

A new explosion took place yesterday at Sumatra's Marapi volcano. Local media reported an ash cloud rising 1.5-2 km and that the eruption was the strongest so far in 2012.

In Guatemala Fuego volcano continues to increase its activity slowly. Incandescent strombolian pulses were seen at night throwing bombs to 100-150 meters above the crater and some of the material generated weak to modest avalanches when falling back. Rumbling and degassing sounds were noted at intervals of 1-6 minutes.
INSIVUMEH reported 18 explosions in the last 24 hours, i.e. about twice as many as during the previous day. 13 of them are described as weak and 5 moderate, generating ash plumes rising up to 900 m and drifting for 9 km to the N and NW.

Santiaguito is almost continuously hidden in clouds, but the seismic signal suggests ongoing rock avalanches from probably still weakly active lava flows on the dome flanks.

Pacaya volcano has only weak steaming at the surface, but there is a lot of seismic activity (small quakes, and long-period events) suggesting fluid movements inside the volcano.

Popocatépetl has been calmer with only 5 weak explosions recorded between 25-26 Sep.

El Salvador's San Miguel volcano continues to show elevated seismic activity.

What could be another seismic swarm and perhaps weak tremor is visible on the current seismogram of Little Sitkin volcano. "Seismic activity remains above background and nothing unusual was observed in mostly cloudy satellite images over the past 24 hours", the Alaska Volcano Observatory reports.

Soufrière Hills remains relatively calm on Montserrat, but frequent rockfalls occur from the dome, and the larger events trigger small pyroclastic flows from time to time.

Satellite observations:

Dukono Volcano (Halmahera, Indonesia): Thermal anomalies at the active craterare visible on recent MODIS images, suggesting low activity in the crater. No ash plumes were detected on satellite images.

An ash plume from Bagana volcano (Bougainville Island, PNG) rising to 8,000 ft (2.4 km) was reported last night by VAAC Darwin. Along with the frequent SO2 plumes visible on satellite data, one can assume that there is ongoing activity (probably a growing lava dome or small flow and intermittent explosions).

Batu Tara had an eruption earlier today as well and produced an ash plume rising to 8,000 ft (2.4 km) altitude.
Previous news
Wednesday, Sep 26, 2012
A stronger than average eruption occurred at Karymski volcano in Kamchatka last night at 20:41 GMT, producing an ash cloud reaching 22,000 ft (ca. 7 km) altitude. ... [more]
Tuesday, Sep 25, 2012
After a week of relatively low and infrequent explosions, Sakurajima volcano has stepped up its activity with 3 eruptions during the early hours of yesterday. The largest at 12:52 h local time produced an ash plume rising to 11,000 ft (3.4 km). ... [more]
Thursday, Sep 20, 2012
During a visit to the summit crater of Etna volcano this afternoon, we could hear deep-seated explosion sounds at intervals of few minutes from the Voragine pit crater, suggesting that some activity is going on deep (several 100 m) within its conduit. Sporadic explosive activity from adjacent Bocca Buova ceased about a week ago according to the Etna mountain guides. ... [more]

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