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SI/USGS Weekly Volcanic Activity Report, 19-25 August 2009 26 August 2009

Posted by admin in activity reports, Batu Tara, Chaitén, Chile, Ecuador, eruptions, Fuego, Guatemala, Hawaii, Indonesia, Japan, Kamchatka, Kilauea, Koryaksky, Mexico, Papua New Guinea, Popocatépetl, Russia, Sakura-jima, Tungurahua, Ubinas, United States.
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SI/USGS Weekly Volcanic Activity Report, 19-25 August 2009

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 19-25 August 2009 is available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity: Koryaksky (Russia).

Ongoing Activity: Bagana (Papua New Guinea), Batu Tara (Indonesia), Chaitén (Chile), Fuego (Guatemala), Kilauea (Hawaii, USA), Popocatépetl (Mexico), Sakura-jima (Japan), Shiveluch (Russia), Suwanose-jima (Japan), Tungurahua (Ecuador), Ubinas (Peru).


Koryaksky (Russia). Seismic activity was slightly above background levels 14-21 August, and gas-and-steam plumes rose to 3.5-5 km a.s.l. over 13-16 August. Gas-and-steam plumes with ash content rose to 3.5-4.2 km a.s.l. and drifted in multiple directions during 16-20 August, and ash plumes were seen in satellite imagery drifting 215 km E and W. A probable ash plume drifted 50 km ESE on 23 August. During 24-25 August, seismicity increased, with more than 100 earthquakes recorded.


Bagana (Papua New Guinea). An ash plume rose to 2.1 km a.s.l. and drifted more than 90 km W on 19 August.

Batu Tara (Indonesia). Ash plumes rose to 1.5 km a.s.l. and drifted 35-150 km W, WNW, and NW during 19 and 21-25 August.

Chaitén (Chile). Steam-and-ash plumes from the lava-dome complex were detected on 19 and 23 August, with the plume drifting SW on the former date.

Fuego (Guatemala). Explosions on 21 and 25 August produced plumes to 4.2-4.6 km a.s.l. and drifted 5-7 km W and SW, and there were rumbling sounds accompanied by incandescent tephra ejected 75 m high on 21 August. Ashfall was reported in areas to the SW on 25 August.

Kilauea (Hawaii, USA). Lava continued to flow SE through the lava tube system to reach the ocean at the Waikupanaha ocean entry, and active surface flows were detected via satellite and visual observations 18-19 August. The Halema’uma’u crater vent continued to produce a diffuse white plume that drifted mainly SW. The sulphur dioxide emission rate continued to be elevated: 950-1140 tonnes/day measured 19-21 August (2003-2007 average rate was 140 tonnes per day).

Popocatépetl (Mexico). An ash plume rose to 8.2 km a.s.l. and drifted 13 km W on 20 August, and an ash plume drifting more than 35 km NNE was seen in satellite imagery on 25 August; during 20-25 August emissions of steam and gas contained slight amounts of ash.

Sakura-jima (Japan). During 19-25 August explosions produced plumes that rose to 2.1-2.4 km a.s.l., and plumes occasionally drifted N, E, and SE. According to a pilot report an ash plume rose to 3 km a.s.l. and drifted less than 20 km S on 24 August.

Shiveluch (Russia). Seismic activity was above background levels during 14-24 August and satellite imagery revealed a large daily thermal anomaly over the lava dome. Seismic data indicated ash plumes possibly rose to 5.9 km a.s.l. and hot avalanches occurred at the lava dome. On 14 August an ash plume drifted 50 km S and on 16 August gas-and-steam plumes rose to 4 km a.s.l.

Tungurahua (Ecuador). During 23-24 August steam-and-gas emissions were observed rising from the crater. Lahars descended W drainages carrying blocks up to 30 cm in diameter on 19 August, and lahars descended W and N drainages on 21 August.

Ubinas (Peru). A pilot reported an emission on 23 August.


The foregoing is a summary of the Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 19-25 August 2009. It is provided for information only, and is based on but not a substitute for the full report, which comes with its own criteria and disclaimers. The map base is derived from the Smithsonian Institution/USGS/US Naval Research Laboratory This Dynamic Planet website.

For all our coverage of the SI/USGS Weekly Volcanic Activity Reports: Weekly Volcanic Activity Reports « The Volcanism Blog.

The Volcanism Blog


1. theroachman - 27 August 2009

Thats seems a bit quite out there, doesn’t it?

2. admin - 27 August 2009

Even allowing for the fact that not that every volcanic happening makes it into the weekly report (as the GVP makes clear), it does seem to have been a slow summer, volcanically speaking. Oh well, it goes that way sometimes…

3. Jackie B. - 27 August 2009

The volcano scene isn’t the only thing thats slow – the Global Volcanism Program website is very slow at th emoment. Keeps timing out on me.

4. Steve Malek - 27 August 2009

I’ve noticed the slowness of the GVP site as well. It seems to have been a problem on and off for quite a while.

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