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SI/USGS Weekly Volcanic Activity Report, 11 February 2009 – 17 February 2009 19 February 2009

Posted by admin in activity reports, Alaska, Arenal, Asama, Caribbean, Colombia, Costa Rica, Dukono, eruptions, Galeras, Guatemala, Hawaii, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Papua New Guinea, Popocatépetl, Rabaul, Redoubt, Russia, Sakura-jima, Santa María, Shiveluch, Soufrière Hills, Tungurahua, Ubinas, United States, Weekly Volcanic Activity Reports.
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SI/USGS Weekly Volcanic Activity Report 11 February 2009 - 17 February 2009

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 11 February 2009 to 17 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: Asama (Japan), Ebeko (Kuril Islands, Russia), Galeras (Colombia), Redoubt (Alaska, USA).

Ongoing activity: Arenal (Costa Rica), Dukono (Halmahera, Indonesia), Karymsky (Kamchatka, Russia), Kilauea (Hawaii, USA), Popocatépetl (Mexico), Rabaul (Papua New Guinea), Sakura-jima (Japan), Santa María (Guatemala), Shishaldin (Alaska, USA), Shiveluch (Kamchatka, Russia), Soufrière Hills (Montserrat), Tungurahua (Ecuador), Ubinas (Peru).


NEW ACTIVITY

Asama (Japan): 11-12 Feb 09, eruptions produced plumes to 3-3.7 km a.s.l., drifted NE, E, and SE; 16 & 17 Feb 09, eruptions produced coloured plumes containing to 3 km a.s.l., drifted E; incandescence in crater observed on web cameras.

Ebeko (Kuril Islands, Russia): 11 Feb 09, ash plume to 0.6km a.s.l., drifted NE; 17 Feb 09, ash plume to 1.2km a.s.l., drifted SW.

Galeras (Colombia): 14 Feb 09, explosive eruption from Galeras, ashfall up to 25km distant, rain and sulphur odours reported, accompanying shock wave detected up to 10km distant, altitude of resultant ash plume not known due to cloud cover; 16-17 Feb 09, small steam plumes to 4.6-6.7 km a.s.l., drifted SE, E, and NE.

Redoubt (Alaska, USA): 10-17 Feb 09, seismic activity variable but elevated above background levels.

ONGOING ACTIVITY

Arenal (Costa Rica): during Jan 09, volcanic activity was at low levels with few eruptions; sporadic strombolian eruptions and avalanches of volcanic material, ash plumes to around 2.2km a.s.l.

Dukono (Halmahera, Indonesia): 11 Feb09, ash plume to 3 km a.s.l., drifted SE.

Karymsky (Kamchatka, Russia): 6-9 Feb 09, seismic activity above background levels; 10-13 Feb 09, seismicity at background levels; ash explosions produced plumes to 2.5km a.s.l.

Kilauea (Hawaii, USA): 11-17 Feb 09 lava flowed SE through tube systems to reach Waikupanaha and Waha’ula ocean entries, with multiple explosions and spatter visible at the ocean entries on most days; occasional incandescence and thermal anomalies suggesting surface flows noted; Halema’uma’u vent continued to produce a predominantly white plume, and incandescence was occasionally noted at the vent.

Popocatépetl (Mexico): 11-17 Feb 09, emissions of steam and gas, some with small amounts of ash, observed; 13 Feb 09, plume to 7.5km, drifted NE.

Rabaul (Papua New Guinea): 13-14 Feb 09, ash plumes from Tavurvur cone rose to 2.4 km a.s.l., drifted SE and W; 17 Feb 09, low-level ash plume drifted SE.

Sakura-jima (Japan): 11-12 Feb 09, ash plumes to 1.2-1.5 km a.s.l.

Santa María (Guatemala): 12 Feb 09, ash puffs from Santiaguito lava dome complex drifted WSW and W; 16 & 17 Feb 09, explosions produced ash plumes to 2.7-3.3km a.s.l. and drifted SW; 16 Feb 09, small pyroclastic flows descended SE flank; 17 Feb 09, incandescent avalanches noted, fumarolic plumes drifted SW.

Shishaldin (Alaska, USA): seismic activity has remained low; 3 Feb 09, weak thermal anomaly noted.

Shiveluch (Kamchatka, Russia): 6-13 Feb 09, seismic activity above background levels, ash plumes to 5.5km a.s.l., lava flows active on N and S flanks; 6 & 8-10 Feb 09, thermal anomaly noted on the lava dome.

Soufrière Hills (Montserrat): 6-13 Feb 09, activity at a low level, two rockfalls detected and seismicity low. 13 Feb 09, one small pyroclastic flow travelled <1km on N side of lava dome.

Tungurahua (Ecuador): 11-17 Feb 09, gas-and-ash plumes to 5.5-7.5 km a.s.l., drifted W, NE, E and SE; 11 Feb 09, small lahars to NW and S; 11 & 12 Feb 09, incandescence observed in crater; 12 & 16 Feb 09, roaring heard; 12 Feb 09 ashfall to SW; 14 Feb 09, ashfall to N; 16 Feb 09, explosion followed by ash emissions that generated a plume to 8 km a.s.l., drifted W.

Ubinas (Peru): 11-16 Feb 09, steam and steam-and-ash plumes to 5.7-6.5 km a.s.l., drifted NE, N, W, and SW.

ACKNOWLEDGEMENTS AND DISCLAIMER

The foregoing is a summary of the Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 4 February 2009 to 10 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.

The Volcanism Blog

Comments

1. Ron de Haan - 19 February 2009

If you produce a world report, you produce a world report.
Therefore I do not understand why Chaitén has not been listed as an ongoing eruption (They leave out a volcano with Red status).
Same goes for Galeras in Colombia.

Are those guys sleeping?

2. volcanism - 19 February 2009

Whether a particular volcano makes it into the GVP weekly bulletin seems to depend on whether there have been any new reports about it received by the team putting the bulletin together, rather than what its behaviour may actually have been. The results often look rather arbitrary to me: Soufriere Hills appears week after week, even when the report is effectively ‘nothing happening’; the Kamchatka volcanoes turn up every week with their varying seismicity and thermal anomalies (many volcanoes, one suspects, could boast as much); and yet, this week, no Chaiten.

3. Sally Kuhn Sennert - 20 February 2009

Chaiten was not included in the 11-17 February Weekly Volcanic Activity Report because there were no available reports from SERNAGEOMIN or the Buenos Aires VAAC in which to generate a summary from. A summary of the eruption that happened on 19 February will be included in the report for next week. Soufriere Hills and Karymsky have been regulars in the Weekly Report mainly because they are both at an elevated Alert (or Hazard) Status, and the reports from KVERT and MVO are regularly available. To learn more about the generation of the Weekly Report, please visit our “Criteria and Disclaimers” page here http://www.volcano.si.edu/reports/usgs/index.cfm?content=disclaimers.

4. volcanism - 20 February 2009

Thanks for dropping by, Sally, and for taking the time to provide this clarification.


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