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SI/USGS Weekly Volcanic Activity Report, 26 August-1 September 2009 3 September 2009

Posted by admin in activity reports, Alaska, Batu Tara, Chaitén, Chile, Dukono, eruptions, Guatemala, Hawaii, Indonesia, Japan, Kamchatka, Kanlaon, Karymsky, Kilauea, Kizimen, Kolokol Group, Koryaksky, Mexico, Pacaya, Papua New Guinea, Philippines, Popocatépetl, Rabaul, Russia, Sakura-jima, Shiveluch, Suwanose-jima, United States, Weekly Volcanic Activity Reports.
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SI/USGS Weekly Volcanic Activity Report 26 August-1 September 2009

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 26 August-1 September 2009 is available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity: Kanlaon (Philippines), Kolokol Group (Russia), Koryaksky (Russia).

Ongoing activity: Batu Tara (Indonesia), Chaitén (Chile), Dukono (Indonesia), Karymsky (Russia), Kilauea (Hawaii, USA), Kizimen (Russia), Pacaya (Guatemala), Popocatépetl (Mexico), Rabaul (Papua New Guinea), Sakura-jima (Japan), Santa María (Guatemala), Shiveluch (Russia), Suwanose-jima (Japan).

Note: a.s.l. = ‘above sea level’.

NEW ACTIVITY

Kanlaon (Philippines). A significant rise in the number of earthquakes was detected over 23 August-1 September. Epicentres were clustered on the NW flank, and a few of the quakes were felt up to 30 km away in Bago City.

Kolokol Group (Russia). A gas-and-steam plume, possibly with some ash, rose from Berg (part of the Kolokol Group of volcanoes) to more than 6 km a.s.l. and drifted NE on 26 August.

Koryaksky (Russia). During 20-23 August seismic activity was slightly above background levels and during 24-27 August at background levels. Ash plumes drifted more than 385 km in easterly directions, and gas-and-steam plumes with ash content rose to 3.7 km a.s.l. and drifted in multiple directions during 26-27 August.

ONGOING ACTIVITY

Batu Tara (Indonesia). During 26 August-1 September ash plumes rose to 1.5-2.4 km a.s.l. and drifted 15-55 km W, NW, and N.

Chaitén (Chile). During 4-20 August the lava-dome complex continued to grow, particularly in the W sector, and gas-and-ash plumes occasionally rose 1.5 km above the lava domes. On 31 August a 4-km-wide ash plume drifted 20 km NE at an altitude of 2.1 km a.s.l.

Dukono (Indonesia). During 26 August-1 September ash plumes rose to 2.1 km a.s.l. and drifted 20-65 km NE.

Karymsky (Russia). During 20-21 August seismic activity was slightly above background levels, and at background levels during 22-31 August. A small thermal anomaly was detected over the volcano on 21 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. Degassing sounds were occasionally heard near the vent, and incandescence on the floor of the vent was visible at night. The sulphur dioxide emission rate continued to be elevated: 1000 tonnes/day measured on 16 August, 950 tonnes/day measured on 27 August (2003-2007 average rate was 140 tonnes per day).

Kizimen (Russia). Seismic activity decreased to background levels on 23-31 August. Gas-and-steam plumes were observed rising from the summit, activity described as normal.

Pacaya (Guatemala). White and blue plumes from MacKenney cone drifted S and SW on 28 August and 1 September, and multiple lava flows 15-200 m long traveled S and SW.

Popocatépetl (Mexico). During 26-27 August emissions of steam and gas sometimes contained slight amounts of ash. On 27 August an ash plume rose to 6.1 km a.s.l. and drifted SW.

Rabaul (Papua New Guinea). During 28-29 August ash plumes from Tavurvur cone rose to 2.4 km a.s.l. and drifted 90-260 km NW and W.

Sakura-jima (Japan). Explosions over 26-29 August and 1 September produced plumes to 1.2-3.4 km a.s.l., occasionally drifting N, NE, and E. An explosion was reported on 31 August but nothing is known about any resultant plume.

Santa María (Guatemala). An explosion was reported on 28 August from the Santiaguito lava dome complex. On 1 September, fumarolic plumes rose 150 m above Caliente dome and drifted SW. Avalanches descended the SW flank of the dome.

Shiveluch (Russia). During 21-27 August seismic activity was above background levels. A large daily thermal anomaly was detected over the lava dome. Seismic data indicated that ash plumes possibly rose to 4.8 km a.s.l. and hot avalanches occurred on the lava dome. Over 20-23 and 26-27 August gas-and-steam plumes rose to 3.3 km a.s.l.

Suwanose-jima (Japan). Explosions during 27-29 August sometimes produced plumes to 1.5-2.4 km a.s.l. that drifted W.

ACKNOWLEDGEMENTS AND DISCLAIMER

The foregoing is a summary of the Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 26 August-1 September 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.

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