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.
As of today (June 15), reports from the local observatory indicate that this activity still goes ...

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 new eruption at Slamet volcano started around 24 April, 2009, last week. Observers report strombolian explosions and ash clouds rising several hundreds of meters from the summit crater.
Slamet is one of Indonesia's highest and most active volcanoes.

As our correspondant from Java reports, new strong strombolian activity has resumed from Anak Krakatau.

Satellite imagery shows, that on 7 January ash plumes from Dukono rose to an altitude of 1.8 km and drifted E and SE.

Satellite imagery reported that on 7 January ash plumes from Batu Tara rose to an altitude of 2.4 km and drifted NE and ENE.

Satellite imagery reported that during 7-8 and 10-11 January ash plumes from Barren Island were seen.

Our tour guide Doni reports strong Strombolian eruptions at Mt.Karang etang volcano. The cone is covered by hot lapilli and ash plumes can be seen. Strombolian eruptions can be seen every 10 - 15 minute. Also Volcanian eruptions.

A pilot reported a lava flow on Barren island on 17 November and also a ash plume was seen.

The Darwin VAAC reported that a ash plume from Semeru that rose to an altitude of 4.3 km and drifted WSW on 22 October.

Based on analysis of satellite imagery, the Darwin VAAC reported that during 16-20 October ash plumes from Batu Tara rose to altitudes of 1.5-2.4 km (5,000-8,000 ft) a.s.l. and drifted W.

On 21 October, the alert level of Soputan was lowered to 2 (on a scale of 1-4) by the CVGHM, assuming that the October 6 eruption has ended.

I was on a flight yesyerday from Jember to Surabaya with 2 friends and saw Mt Semeru explode at app. 09.37 on the 18 Oct 2008. We were about 20 km from the mountain when I noticed the the top had a small gray mushroom at the top with in a minute or so i was extremley greater in size. I would not be able to guess how high it rose but it was larger than the clouds around. I'm just sending this message as I did not read anything in the news.
 
Regards Denis Benjak

A new small eruption took place at the lava dome of Soputan volcano on 6 October. Ash explosions produced plumes rising to 2.8 km (9,200 ft) a.s.l. and were accompanied by Strombolian activity that ejected incandescent material 50-150 m above the crater. On 7 October, white plumes rose to altitudes of 2.3-3.3 km (7,500-10,800 ft) a.s.l. Incandescent material was again ejected 50-150 m from the crater. Incandescent rockfalls traveled 500 m W. The next day, plumes rose to an altitude of 2 km (6,600 ft) a.s.l. and in the following days, the activity decreased.
 

According to a news article, explosions and earthquakes from Anak Krakatau averaged 120 per day approximately during 11-17 August. Monitoring personnel observed active lava flows, ejecting rocks, and emissions of "smoke."

The Darwin VAAC reported that on 19 August an ash plume from Dukono rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted W.

Based on analysis of satellite imagery, the Darwin VAAC reported that during 14-17 August ash plumes from Batu Tara rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted W.

Strombolian activity with frequent ash explosions creating plumes of up to about 1 km height continue at Anak Krakatau.

Small pyroclastic flows and rockfall avalanches have been observed at Semeru since 22 May. The pyroclastic flows travelled a maximum distance of 2.5 km from the active crater.
 

Soputan volcano started to erupt again on 6 June, producing ash plumes 2-3 km heigh and pyroclastic flows triggered by its growing lava dome that reached 4 km distance from the volcano.