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Volcanic activity world-wide 27-28 August 2012: Soputan, El Hierro, Popocatépetl, Nevado del Ruiz, Batu Tara, Sakurajima, Ambrym

Tuesday Aug 28, 2012 12:07 PM | BY: T

A new strong eruption occurred at Soputan volcano in North Sulawesi Sunday night. The eruption lasted about 4 hours and produced an ash column of 5 km height. No reports of damage of the eruption are known. People are advised not to approach or climb the volcano within 6 km radius, and to wear face masks in case of ash fall.

The number of of earthquakes at El Hierro seems to continue to increase slowly. Yesterday, there were 17 earthquakes, mostly at 10 km depth clustered in a N-S zone beneath the western El Golfo coast. Currently, there is no tremor associated with this activity.

Not much has changed at Popocatépetl volcano. A slight increase in the frequency of small explosions to about 1 or 2 per hour can be noted. Some of the explosions produce not only steam, but some ash, and the more powerful ones eject glowing material falling back into the crater.
Weak tremor pulses lasting about 4 hours, and a series of small earthquakes between 19:00 and 19:30 were recorded on 26 Aug. SO2 emission remains high.

Nevado del Ruiz volcano: Steam and ash emissions accompanied by a near-constant weak tremor signal continue. At 16:22 p.m. on 27 Aug, a 2.0 earthquake occurred at 3 km depth beneath Arenas crater.

Tungurahua volcano's activity is moderate judged from seismicity, but due to near-constant cloud cover difficult to assess. No larger explosions have occurred over the past 2 days and no ash fall was recorded. At las 20h27 local time on 26 Aug, a small volcanic quake was felt in the Cusúa and Juive Grande sectors.
At the time of writing, a strongly rising tremor signal is visible, possibly associated with new explosions and ash emissions.

Satellite observations:

Batu Tara (Sunda Islands, Indonesia) erupted more ash clouds rising to 1.8 km altitude yesterday (6,000 ft).

Sakurajima volcano on Kyushu (Japan) remains at relatively low levels, and only produced 2 weaker explosions during the past 2 days.

A strong SO2 plume from Ambrym volcano on Vanuatu on today's NOAA satellite image, suggesting lots of lava lake activity there.
Previous news
Sunday, Aug 26, 2012
Tungurahua volcano's activity is relatively low. There are weak pulses of tremor associated with some small to medium explosions. Still, small pyroclastic flows continue to occur sporadically, the most recent one on 24 August at 15:33 on local time. ... [more]
Saturday, Aug 25, 2012
The alert level of Tangkubanperahu volcano in West Java, Indonesia, was raised to 2 (on a scale 1-4) on 23 August. An increase of earthquakes has been observed at the volcano since 13 August. ... [more]
Friday, Aug 24, 2012
Tungurahua volcano's activity remains at similar moderate levels as yesterday, lower than compared to a few days ago. Explosions every few hours are accompanied by strong cannon-shot noises and eject glowing bombs to up to 500 m height. Steam and ash plumes rise up to 4 km above the crater. Light ash fall was reported to the W and NW in the sectors of Chacauco, Cotaló and El Tablón. ... [more]
Thursday, Aug 23, 2012
Tungurahua volcano's activity has decreased. There are still occasional weak explosions, but bad weather prevents direct observation. ... [more]
Wednesday, Aug 22, 2012
Tungurahua volcano has been very active the past days, with continous ash emissions and occasional large explosions producing ash plumes up to 32,000 ft (ca. 10 km) altitude. IG scientists on an overflight observed strombolian activity from the inner summit crater which has filled with fresh lava. ... [more]

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