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Volcanic activity world-wide 29 August 2012: Etna, Stromboli, El Hierro, Popocatépetl, Santiaguito, Fuego, Nevado del Ruiz, Cumbal, Sotará, Galeras, Machin, Nevado del Huila, Tungurahua, El Misti, Sakurajima

Wed, 29 Aug 2012, 15:19
15:19 PM | BY: T
Not much volcanic activity is currently occurring in the world (something that can quickly change). Here are a few updates:

Etna volcano: Short pulses of increasing tremor have reappeared over the past days, but were not sustained, perhaps corresponding to short phases of strombolian activity in Bocca Nuova.

Activity at Stromboli volcano in the Eolian Islands has been at comparably low levels the recent days. Explosion signals and tremor have been weak to moderate INGV reported.

Earthquake activity at El Hierro has been decreasing since yesterday, when there were 8 and today only 2 very small quakes.

Popocatépetl: A slight increase in activity seems to be occurring. There are on average about 1 weak steam explosion per hour, with an increase in frequency last evening. Some of the explosions produce small amounts of ash and plumes up to 1.5 km high, such as one at 03:56 early yesterday. Glowing material can be seen ejected during such events at night. A significant SO2 plume is visible as a bluish haze during clear weather and on satellite images.

Fuego volcano: The lava flow towards the Taniluya canyon is 200 m long and produces small incandescent rockfalls. A weak glow was observed from the crater at night. INISIVUMEH mentions no explosions, but probably, small ones continue to occurr sporadically.
Santiaguito: INSIVUMEH mentions only degassing and a few weak to moderate rock avalanches from the dome, but the lava flows still seem to be active judging from the latest webcam image.

In Colombia, not much has changed at the currently 5 volcanoes on alert:
Galeras produces infrequent gas and steam emissions, such as observed during clear weather on 21 and 26 August. The emission on 26 Aug at 4:30 pm local time contained some ash and was accompanied by a small tremor pulse. Seismicity has been a bit higher than during the previous week, the Pasto observatory reports. Volcanic earthquakes at various locations under the volcano reached a magnitude of 2.5 and depths up to 9 km.

Cumbal volcano had 2 earthquake swarms on 23 and 26 August, with 115 and 94 quakes, respectively. White gas emissions from the El Verde fumarole could be observed on 24 August. INGEOMINAS mintains yellow alert for the volcano.

Nevado del Ruiz volcano has not changed its behaviour, producing a constant weak tremor signal, strong steam and some ash emissions.

Weak seismic unrest continues at nearby Cerro Machin volcano as well, with no significant changes to previous weeks. There are small volcanic quakes clustered at depths between 3-6 km south and southwest under the main summit dome.

Sotarà volcano continues to show unrest. The volcano has produced a total of 71 volcanic quakes were recorded over the past week including 6 between magnitudes between 0.1-1.3 at shallow depths of 2-3 km north of the summit. A possible inflation of the NE sector of the volcano is being detected on tilt meters.

Nevado del Huila has remained stable. During the past week, 84 seismic events were registered and a SO2 flux of 80 tonnes / day measured.

Tungurahua volcano in Ecuador shows an increasing tremor signal which suggests ongoing ash emissions and more explosions, but bad weather prevents direct observations. The recent moderate rain falls have fortunately not caused lahars, IG mentions.

An article in Peruvian press mentions earthquake swarms under El Misti volcano near Arequipa (Peru), a possible sign that the volcano, which has been dormant for 500 years could be reawakening slowly.

Sakurajima volcano remains relatively quiet as well. There were 2 probably weak explosions yesterday, and none so far today.

Previous news

Tue, 28 Aug 2012, 12:07

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

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. ... Read all
Sun, 26 Aug 2012, 16:46

Volcanic activity world-wide 26 August 2012: Tungurahua, El Hierro, Popocatépetl, Batu Tara, Sakurajima, Iceland glacial flood

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. ... Read all
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