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SI/USGS Weekly Volcanic Activity Report, 18 February 2009 – 24 February 2009 26 February 2009

Posted by admin in activity reports, Barren Island, Caribbean, Chaitén, Chile, Colombia, Ecuador, eruptions, Fuego, Galeras, Guagua Pichincha, Guatemala, Hawaii, Indian Ocean, Japan, Kamchatka, Karymsky, Kilauea, Mexico, Papua New Guinea, Peru, Popocatépetl, Rabaul, Redoubt, Russia, Sakura-jima, Santa María, Soufrière Hills, Suwanose-jima, Tungurahua, Ubinas, United States, Weekly Volcanic Activity Reports.
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SI/USGS Weekly Volcanic Activity Report 18 February 2009 - 24 February 2009

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 18 February 2009 to 24 February 2009 is now available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity: Chaitén (Chile), Galeras (Colombia), Redoubt (Alaska).

Ongoing activity: Barren Island (Andaman Islands), Fuego (Guatemala), Guagua Pichincha (Ecuador), Karymsky (Kamchatka, Russia), Kilauea (Hawaii, USA), Popocatépetl (Mexico), Rabaul (Papua New Guinea), Sakura-jima (Japan), Santa María (Guatemala), Shiveluch (Kamchatka, Russia), Soufrière Hills (Montserrat), Suwanose-jima (Japan), Tungurahua (Ecuador), Ubinas (Peru).

NEW ACTIVITY

Chaitén (Chile): 19 Feb 09, partial lava-dome collapse on south flank of dome complex generated lateral explosions, block-and-ash flows and pyroclastic flows, with one pyroclastic flow descending southward to within 5 km of Chaitén town, ash plumes to 9.1 km a.s.l., drifted W and SE, ashfall up to 65 km distant ESE, ash-and-steam plumes rose to 7.1-9.1 km a.s.l.; 23 Feb 09, lahars descended river valleys, whitish plume to about 1 km above the domes; 23-24 Feb 09, ash plumes to 2.1-3 km a.s.l., drifted NE and E.

Galeras (Colombia): 20 Feb 09, explosive eruption, accompanied by shock waves and audible as far away as Popayán (160 km NNE), two explosions reported, incandescent blocks ejected, sulphur gas odours, ash plume to 12.5 km a.s.l., drifted E, W and N, ashfall reported to the W, gas plumes with low ash content to 700 m above summit; 22-24 Feb 09, steam plumes to 500 m above summit, drifted NNW.

Redoubt (Alaska, USA): 18-24 Feb 09, variable seismic activity, elevated above background levels; 23 & 24 Feb 09, steam plumes observed within summit crater.

ONGOING ACTIVITY

Barren Island (Andaman Islands): 20-21 Feb 09, ash plumes to 2.4 km a.s.l., drifted about 75-90 km WNW, NW and N.

Fuego (Guatemala): 18 Feb 09, ash plumes to 6.1km a.s.l., drifted WSW; 20 & 24 Feb 09, explosions produced ash plumes to 4.1-4.7 km a.s.l., drifted 6-8 km SW, some explosions with rumbling sounds and shock waves; incandescent material ejected 150 m above crater, incandescent avalanches of blocks descended W and SW flanks.

Guagua Pichincha (Ecuador): 16-17 Feb 09, four moderate phreatic explosions.

Karymsky (Kamchatka, Russia): 21-22 Feb 09, eruptions produced plumes to 3-4.3 km a.s.l.

Kilauea (Hawaii, USA): 18-24 Feb 09, lava entered the sea at Waikupanaha ocean entry producing occasional explosions; 17 Feb 09, four large explosions accompanied collapse of the Waikupanaha bench, propelling rocks and spatter 275m inland; 18-20 Feb 09, lava also entered the ocean at Waha’ula and at Poupou, a second point further E, from 18 Feb 09; incandesence and thermal anomalies observed; Halema’uma’u vent continued to produce predominantly white plume, and incandescence intermittently seen; 20 Feb 09 small, hot degassing vent observed deep below the vent rim.

Popocatépetl (Mexico): 18-24 Feb 09, emissions of steam and gas visible, occasionally containing slight amounts of ash.

Rabaul (Papua New Guinea): 22-23 Feb 09, ash plumes from Tavurvur cone to altitudes of 1.8-3 km a.s.l., drifted S, W and NW.

Sakura-jima (Japan): 22 Feb 09, explosion produced plume to 2.7 km a.s.l., drifted N.

Santa María (Guatemala): 18 Feb 09, dense ash plume from Santiaguito lava dome complex drifted W; 20 Feb 09, explosion produced an ash plume to 3.2 km a.s.l., drifted E; 24 Feb 09, explosion produced white plume to 500 m above the summit, drifted SW.

Shiveluch (Kamchatka, Russia): 13-20 Feb 09, seismic activity at background levels, ash plumes to a possible altitude of 4.6 km a.s.l., active lava flows on S and N flanks; 12-13 & 19 Feb 09, fumarolic activity observed; 17 Feb 09, ash plume drifted 31 km NW.

Soufrière Hills (Montserrat): 13-20 Feb 09, activity at a low level, four rockfalls detected,m slight increase in seismicity; 16 Feb 09, heavy rainfall triggered small pyroclastic flow on N
side of lava dome and substantial lahar NW in the Belham River.

Suwanose-jima (Japan): 18 Feb 09, explosive eruption, coloured plume to 400 m above the crater, drifted E; 19 Feb 09, two explosive eruptions occurred; 20 & 21 Feb 09, explosions reported.

Tungurahua (Ecuador): 8-24 Feb 09, ash plumes rose to 6-8 km a.s.l., drifted mainly W and NW; ashfall reported almost daily to the SW, W, and NW, blocks erupted, roaring noises heard; 18 Feb 09, incandescence seen in the crater; 19-20 & 22-23 Feb 09, strombolian activity observed at summit.

Ubinas (Peru): 23 Feb 09, ash to 6.2-7.6 km a.s.l., drifted S.

ACKNOWLEDGEMENTS AND DISCLAIMER

The foregoing is a summary of the Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 18 February 2009 to 24 February 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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