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Archived news:

Friday, Jun 30, 2006

As the Geophysical Institute of Quito reports, strombolian activity at Tungurahua volcano and its seismicity have been increasing over the past days. On 28 June, 86 explosions were counted by the seismic network. In nearby villages, strong pressure waves could be felt from some of the explosions. A weak steam and ash plume is present over the summit and during the night, incandescent blocks are seen to be thrown out of the crater to heights of approximately 100 meters.

Karymski volcano remains the most active volcano on Kamchatka with frequent strong strombolian to vulcanian-type explosions producing ash plumes up to 3-4 km altitude.

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Sunday, Jun 25, 2006
Stromboli volcano's crater terrace with 7 of the 9 active vents visible: from left to right, a tall eruption from the NW crater, 2 visible glowing vents in the central crater, the spattering NE cone of the central crater with its smaller flank vent, and two vents (one erupting weakly) of the NE crater. (Photo taken early on 25 June)
Stromboli volcano's crater terrace with 7 of the 9 active vents visible: from left to right, a tall eruption from the NW crater, 2 visible glowing vents in the central crater, the spattering NE cone of the central crater with its smaller flank vent, and two vents (one erupting weakly) of the NE crater. (Photo taken early on 25 June)

During the past weeks and months, Stromboli has continued to show extraordinarily high activity as several groups of VolcanoDiscovery have observed.
During a visit on 24 June, 9 active vents were counted: two active vents in the NW crater (towards Ginostra), one of which exploded with tremendous noise every 20-30 minutes, throwing powerful jets of burning gas followed by large amounts of spatter to heights of up to 3-400 m, showering the OUTER rims of the crater terrace. A neighboring vent, a few meters away from it, is normally not visible, but when it erupted, it had the appearance of the ground opening and emitting glowing ash that slowy rose, blackened and created small ash plumes.
In the central crater, 4 visible glowing vents and one hidden behind the wall were active, the most prominent being the tall cone in the NE corner of the complex. The NE cone was spattering constantly, throwing spatter to considerable 50-100 m height. This activity was interupted every 5-10 minutes by strong, hissing fountains lasting up to 20 seconds, and thowing incandescent material to up to about 250 height. At times, the force of the fountain activated a second vent next to it, on the SE side of the cone, apparently serving as an additional valve whenever the output rate during the fountains from the cone itself becomes too large. Two other vents in the central crater complex were large, constantly glowing holes, but showed only occasional weak spattering and erupted only rarely strombolian bursts of spatter to 100-150 m height. A fith vent is not visible from Pizzo, but on a visit on 15 June, it was observed to erupt spatter occasionally to about 100 m height (about once per hour).On 25 of June, it was not erupting.
Last, there were two active vents in the NE crater (towards the village of Stromboli), one of which erupts spectacularly about every 20-30 minutes, throwing lots of incandescent bombs towards the E, showering the outer crater slope with bombs. These eruptions also produced dense ash clouds.

...more [read all]
Friday, Jun 23, 2006

Etna continues its worrying slumber. After an isolated phreatic explosive event in January, the diafragma separating Bocca Nuova crater and the Voragine (the former Central crater) as well as the wall separating the two craters inside Bocca Nuova have mostly collapsed, leaving what is now best described as one single central crater with several pits and vents at considerable depth.
Several VolcanoDiscovery groups visited Etna on various occasions over the past weeks, and found strong degassing taking place from fractures in the walls and the bottoms of the various vents inside the central crater, as well as audible but deep-seated explosive activity inside North-East crater.

Monday, Jun 19, 2006

Based on pilot reports, ash clouds identified from Ubinas during 9-11 Junereached altitudes of 6.7 km (22,000 ft) a.s.l. and drifted E and SW. Accordingto news articles, approximately 550 families were evacuated on 10 and 11 June.

During 7-13 June, small-to-moderate explosions at Tungurahua produced plumes composed of gas, steam, and small amounts of ash. On 9 and 11 June, light ash fall was reported in nearby areas. According to the Washington VAAC, night-time incandescence was observed on satellite imagery through the reporting period.

During 7-13 June, seismic signals indicated that the lava spine continued to grow inside the crater of Mount St. Helens. On 9 June, pilots reported that anash-and-steam plume, generated after a rockfall following a M 3.2 earthquake,reached an altitude of 4.6 km (15,000 ft) a.s.l. The volcano remained at VolcanoAdvisory (Alert Level 2); aviation color code Orange.

During 2-9 June, the Soufrière Hills lava dome continued to grow at a high rate of 10 cubic meters per second on average (average growth rate during January-April was 6 cubic meters per second). Vigorous ash-and-gas venting occurred from a vent to the W of the lava dome. According to a pilot report and MVO, the Washington VAAC reported on 9 June that a steam plume with little ash content reached an altitude of 1.5 km (5,000 ft) a.s.l. Weak incandescence was observed on satellite imagery on 10 June.

According to the Darwin VAAC, satellite imagery showed small ash plumes from Semeru on 6 and 12 June and minor ash-and-steam plumes on 11 and 13 June, all at unknown altitudes.

During 7-13 June, lava from Kilauea continued to flow off of a lava delta into the ocean at the East Lae`apuki entry. Incandescence was visible from drainhole event during the reporting period. Tremor remained at a very typical moderate level at Pu`u `O`o. The summit of Kilauea slowly inflated.

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