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A powerful vulcanian explosion in its initial stage showing the expanding explosion of the pressurized plug. (2 July 09)
After a 36 hrs pause in activity between the evening of 30 June and the morning of 2 July, Anak Krakatau started again with powerful vulcanian explosions. The largest of these explosions were preceded by an inflation and shaking of the active cone or lava dome, triggering rock-slides from its flanks, until the plug gave way in giant explosions ejecting a rapdly expanding mass of red-hot lava, solid rocks, and large amounts of ash, forming plumes of up to 2 km heights. Most of these explosions ejected many blocks into the sea and the forest of Anak Krakatau, and on one location, our boat at around 500m distance from the shore, had to make a quick escape from falling blocks, some of which nevertheless fell beyond the boat, but fortunately did not hit...
The effusive eruption at Etna's NE flank has ended on the evening of 6 July after 14 months of moderate to weak lava emission, Boris Behncke reports on his flickr website. ...more
Vigorous degassing at Bocca Nuova as well from SE crater and possibly deep-seated explosions inside NE crater (reported by mountain guides) might be signs that the next activity at Etna might be from the summit craters in the near to medium future at Etna volcano. [less]
Strombolian activity at Anak Krakatau on 6 June 2009
The activity of Anak Krakatau continues with no sign of weakening. As observed during a recent expedition from 4-8 June, strong strombolian activity from the new vent between the old summit vent and the 2007 vent on the S side of the summit cone has filled the collapse crater from 2007 and throws incandescent blocks and bombs to up to 500-700 m above the vent and reaching severl hundreds meters distance. At times, this activity is similar to small lava fountains and at other times, eruptions are more vulcanian-type, rich in ash, producing plumes up to 1 km high. The latter are often accompanied by loud blasts that can be heared many kilometers away and give impressive echoes on the walls of the surrounding caldera. Indivudal explosions are following each other at invervals of 2-5 and rarely more minutes. Photos of this activity can be found here. ...more
As of today (June 15), reports from the local observatory indicate that this activity still goes on unabated. [less]
A moderately powerful explosion at Yasur volcano (26 May 2009)
During our expedition on Tanna Island, we observed Yasur during 25-29 May. Activity was a low to moderate levels in that period and only 3 vents in the western crater were active although glow from the eastern crater was seen. Near-continuous spattering was seen from the westernmost vent, and more powerful ejections from the other two vents were observed at intervals of 10-15 minutes, throwing incandescent lava bombs to 100-150 m height. Only small amounts of ash were usually produced. ...more
Photos from this activity can be found here. [less]
The activity of Anak Krakatau is increasing. Direct observations of the crater in late April revealed strong strombolian activity from a vent inside the crater of the 2007-2008 eruption building up a new scoria cone inside this crater. We are planning to revisit the volcano in the first week of June for more observations.
A strong explosive eruption took place at Sheveluch volcano on May 1st, 2009, sending an ash cloud to 5 km above the volcano. The eruption followed a week of heightened seismicity and might be the start of a stronger eruptive phase.
Powerful explosion from the central crater, throwing bombs onto and beyond Pizzo
As observed during an ongoing tour with Tom and a small group, the activity at Stromboli volcano is usually strong. Explosions from several vents, often accompanied by loud thundering noises that can be heard on the whole island, occur frequently from seveal vents, and often throw blocks and incandescent bombs to up to 400 m height. Bombs are sometimes hitting the trail and the Pizzo, which must be considered very dangerous to stay at. The access to the summit is therefore, for the time being, closed to visitors, but the viewpoint on the Sciara del Fuoco at 400 m provides excellent and impressive viewing opportunities.
After about a week of weak activity, Redoubt exploded again on April 4th. Our team member Marco Fulle is on location and reports heavy thunderstorms from below the 15 km tall ash plume. More details and photos will be available soon.
A major eruption of sub-plinian to plinian type took place at Redoubt this morning, sending an ash plume to more than 60,000 ft altitude (>20km), as AVO reports. The eruption, by far the largest in its new cycle of activity so far, started at 09:24 am local time, following a few days with lower activity after the powerful explosions on March 22-23.
After about two days of increasing seismicity, a large plinian or sub-plinian explosive eruption is in course at Mt. Redoubt volcano; . ...more
It follows a period since late last year of gradually increasing activity, and a short-term period of seismic swarms related to rock failure due to increasing pressure and the rise of the magma. The eruption is being closely monitored by USGS staff from the Alaska Volcano Observatory (AVO). From their rapidly succeeding reports: [less]
A new eruption is taking place in the Tonga islands in the South Sea, between the small islands of Hunga Tonga and Hunga Ha'apai, which are the tiny suaerial parts of a large underwater volcano located about 30 km SSE of Falcon Island. The last eruptions in this area were reported in 1912, 1937 and 1988. ...more
Pilots and residents from adjacient islands observed a huge ash and steam plume from the location of the eruption, rising up to 5-7 km. Photos and more detailed coverage on this eruption can be found on the excellent blogsiteThe volcanism Blog. [less]
A medium-sized eruption has occurred at Redoubt volcano, Alaska, the USGS / Alaska VolcanoObservatory (AVO) reports. Seismic activity had increased markedly since Sunday afternoon (March 15, 2009) and was followed by 4 hours of continuous volcanic tremor. ...more
The onset of the tremor was associated with a small explosion that produced a plume of gas and ash that rose to about 15,000 feet above sea level and deposited a trace amount of ash over the summit-crater floor and down the south flank of the volcano to about 3,000 feet. AVO notes that "at this time it does not appear that the increase in activity heralds a significant eruption in the short term, but conditions may evolve rapidly." [less]
On 24 February it was reported that a partial dome collapse of Chaitén's Domo Nuevo 1 lava-dome complex a large amount of material accumulated in the basal ring depression surrounding the dome complex and throughout the Blanco River valley. Steam plumes with little ash content and explosions were noted. ...more
On 26 February, it was reported that plumes rose 2 km above the complex. During 26-27 February, there was another small dome collapse. [less]
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