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SI/USGS Weekly Volcanic Activity Report, 20-26 May 2009 27 May 2009

Posted by admin in activity reports, Alaska, Barren Island, Batu Tara, Caribbean, Chaitén, Chile, Colima, Dukono, Ebeko, Ecuador, eruptions, Fuego, Guatemala, Hawaii, India, Indonesia, Japan, Kamchatka, Karangetang, Kilauea, Llaima, Mexico, Papua New Guinea, Peru, Rabaul, Redoubt, Reventador, Russia, Sakura-jima, Shiveluch, Slamet, Soufrière Hills, Suwanose-jima, Tungurahua, Ubinas, United States, Veniaminof, Weekly Volcanic Activity Reports.
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SI/USGS Weekly Volcanic Activity Report 20-26 May 2009

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 20-26 May 2009 is available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity: Karangetang (Indonesia), Reventador (Ecuador), Slamet (Indonesia)

Ongoing activity: Barren Island (India), Batu Tara (Indonesia), Chaitén (Chile), Colima (Mexico), Dukono (Indonesia), Ebeko (Russia), Fuego (Guatemala), Kilauea (Hawaii, USA), Llaima (Chile), Rabaul (Papua New Guinea), Redoubt (Alaska, USA), Sakura-jima (Japan), Shiveluch (Russia), Soufrière Hills (Montserrat), Suwanose-jima (Japan), Tungurahua (Ecuador), Ubinas (Peru), Veniaminof (Alaska, USA).


Karangetang (Indonesia). 24 May, ash plume reported to 3.7 km a.s.l., drifted 75 km S.

Reventador (Ecuador). 26 May, diffuse ash plume to 6.4 km a.s.l. drifted SW, intermittent thermal anomalies, gas plumes with possible ash also observed.

Slamet (Indonesia.: Seismicity continued to rise or remain elevated with activity peaking on 17 May, white-to-brown plume to 800 m above crater, inflation detected, ashfall 5-9 km away. Lava fountains rose 100-400 m above crater rim during 12 and 21-23 May, white-to-grey emissions to 150 m above crater, incandescent material ejected onto W flank. 22 May, ashfall reported 5 km distant; 23 May, ash plume to 1 km above crater, ashfall on N flank; 24 May, ash plume to 700 m above crater.


Barren Island (India). 20 May, ash plume to 2.1 km a.s.l., drifted 75 Km NE.

Batu Tara (Indonesia). 20 May, ash plumes to 3 km a.s.l., drifted 65 km NW; 26 May, ash plume to 2.4 km a.s.l., drifted 55 km NW; thermal anomaly noted on satellite imagery.

Chaitén (Chile). Lava dome complex continuing to erupt, gas-and-ash plumes to 1.5 km above the complex and collapses generated block-and-ash flows. Lava dome growth was concentrated in the SW area of the complex. 21 and 26 May, ash plumes to 2.4-3.7 km a.s.l., drifted SSE on 21 May and 45-50 km NE on 26 May.

Colima (Mexico). 21-25 May, white and grey plumes to 3.9-4.2 km a.s.l., drifted E, SE and S.

Dukono (Indonesia). 26 May, ash plume to 3 km a.s.l., drifted 90 km N.

Ebeko (Russia). 22 May, ash plume to 2.4 km a.s.l., drifted SE.

Fuego (Guatemala). 21 May, lahars descended to the W and SW; 25-26 May, explosions produced ash plumes to 4.1-4.7 km a.s.l., drifted W, SW, S and SE, with rumbles; 25 May, fumarolic plumes rose to 4.2 km a.s.l. and drifted S and SE; 26 May, ashfall reported to W and WSW.

Kilauea (Hawaii, USA). 20-26 May, lava flowed SE through lava tubes to the Waikupanaha and Kupapa’u ocean entries; the Halema’uma’u vent continued to produce a mainly white plume to 200-300 m which drifted N, NE and SW, and a molten lava pool produced varying incandescence.

Llaima (Chile). 12-18 May, sporadic incandescence and steam plumes reported in the SW of the main crater.

Rabaul (Papua New Guinea). During 14-20 May white/blue plumes from Tavurvur cone rose to 1 km above the crater, and summit incandescence was seen at night; 20-21 May ash plumes rose to 2.4 km a.s.l. and drifted 30-40 km SE and SW.

Redoubt (Alaska, USA). 20-36 May, seismicity remained above background levels and lava dome growth continued, with visible steam-and-gas emissions and occasional rockfalls producing minor ash clouds.

Sakura-jima (Japan). 26 May, eruption produced a plume to 2.7 km a.s.l., drifted NW.

Shiveluch (Russia). 15-22 May, seismicity above background levels; hot avalanche on 16 May produced an ash plume to 4.5 km a.s.l.; active fumaroles reported 17-18 May; possible ash plume rose to 5.3 km a.s.l. on 21 May; daily thermal anomaly detected over lava dome.

Soufrière Hills (Montserrat). 15-22 May, slight increase in activity, but remained overall at a low level; tectonic earthquakes at less than 3 km beneath the lava dome noted on several days, multiple lahars occurred on 18 May, two possible explosions detected on 21 May.

Suwanose-jima (Japan). 25 May, ash plume to 1.5 km a.s.l.

Tungurahua (Ecuador). 22, 24, 25 and 26 May, ash plumes rose 1-2 km above summit and drifted W, occasional roaring sounds and explosions reported, ashfall reported to the W and SW 20-23 and 25-26 May, crater incandescence seen 24-26 May.

Ubinas (Peru). 20 May, ash plume rose to 7.3 km a.s.l., drifted NE; two explosions reported on 25 May.

Veniaminof (Alaska, USA). Decline in seismicity up to 26 May.


The foregoing is a summary of the Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 20-26 May 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. 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. Miguel V. - 13 July 2009

Thanks a lot for your continuing reports!

2. volcanism - 13 July 2009

Thanks, Miguel! I’m currently catching up with the backlog caused by my illness. Should all be up to date soon.

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