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

Posted by admin in activity reports, Alaska, Batu Tara, Caribbean, Chaitén, Chile, Colombia, Dempo, eruptions, Etna, Galeras, Gamkonora, Hawaii, Indonesia, Italy, Japan, Kamchatka, Karymsky, Kilauea, Koryaksky, Kuchinoerabo-jima, Lewotobi, Okmok, Pacific, Papua New Guinea, Peru, Popocatépetl, Rabaul, Redoubt, Russia, Sakura-jima, Shiveluch, Soufrière Hills, Tonga, Tungurahua, Ubinas, United States, Weekly Volcanic Activity Reports.
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SI/USGS Weekly Volcanic Activity Report 18 March 2009 - 24 March 2009

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 18 March 2009 to 24 March 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: Galeras (Colombia), Hunga Tonga-Hunga Ha’apai (Tonga), Koryaksky (Kamchatka, Russia), Redoubt (Alaska, USA).

Ongoing activity: Batu Tara (Komba Island, Indonesia), Chaitén (Chile), Dempo (Sumatra, Indonesia), Etna (Italy), Gamkonora (Halmahera, Indonesia), Karymsky (Kamchatka, Russia), Kilauea (Hawaii, USA), Kuchinoerabu-jima (Japan), Lewotobi (Flores Island, Indonesia), Okmok (Alaska, USA), Popocatépetl (Mexico), Rabaul (Papua New Guinea), Sakura-jima (Japan), Shiveluch (Kamchatka, Russia), Soufrière Hills (Montserrat), Tungurahua (Ecuador), Ubinas (Peru).

NEW ACTIVITY

Galeras (Colombia): 21-23 Mar 09, white-coloured gas plumes to 5.4 km a.s.l., drifted in multiple directions; 17-24 Mar 09, SO2 levels high.

Hunga Tonga-Hunga Ha’apai (Tonga): 18-19 Mar 09, ash plumes to 4.0-5.2 km a.s.l., drifted NE and ENE; 20 Mar 09, steam plumes to 1.8 km a.s.l.; 21 Mar 09, eruption plume to 0.8 km a.s.l.

Koryaksky (Kamchatka, Russia): 13 Mar 09, seismicity elevated; 14-20 Mar 09, seismicity at background levels; gas plumes with low ash content to 4 km a.s.l., drifted E; ash emitted from upper fumarolic vent.

Redoubt (Alaska, USA): 20 Mar 09, shallow earthquake activity; 21 Mar 09, steam plume to 3.4 km a.s.l., increased seismicity; 22-23 Mar 09, six explosive eruptions, ash plumes mostly to between 7.6-9.1 km a.s.l. and to maximum of 18.2 km a.s.l.,with bulk of ash volume between 7.6-9.1 km a.s.l., ashfall reported 190-250 km NE, pyroclastic flows observed, extensive lahars; 24 Mar 09, steam plume to 6.1km, drifted65 km NW.

ONGOING ACTIVITY

Batu Tara (Komba Island, Indonesia): 20 Mar 09, ash plume to 2.4 km a.s.l., drifted NW.

Chaitén (Chile): 10-16 Mar 09, continued growth of lava-dome complex, generating collapses and block-and-ash flows, ash-and-gas plumes drifted mainly SE; 20-21 & 23 Mar 09, ash plumes to 2.1-2.4 km a.s.l., drifted E and NE.

Dempo (Sumatra, Indonesia): 23 Mar 09, alert level lowered following decreased seismicity.

Etna (Italy): 16-22 Mar 09, degassing from NE Crater, NW Bocca Nuova vent, E flank of SE Crater, and summit fumarolic fields; active lava flows from NW-SE-trending fissure E of summit craters.

Gamkonora (Halmahera, Indonesia): 23 Mar 09, alert level lowered following decreased seismicity; diffuse white plumes to 50-150 m above summit crater.

Karymsky (Kamchatka, Russia): 12 & 18 Mar 09, seismicity above background; 12 Mar 09, ash plume to 3.9 km a.s.l., drifted E; 12-14 & 16-17 Mar 09, thermal anomaly on the lava dome, ash plumes drifted 200 km easterly.

Kilauea (Hawaii, USA): 18-24 Mar 09, lava flowed SE through lava tube system to Waikupanaha and Kupapa’u ocean entries, scattered surface flows observed; 19 Mar 09, explosions from Waikupanaha ocean entry; Halema’uma’u crater continued to produce predominantly white plume; incandescence intermittently observed.

Kuchinoerabu-jima (Japan): 18 Mar 09, alert level lowered following decrease in seismicity, deformation and SO2 emission.

Lewotobi (Flores Island, Indonesia): 23 Mar 09, alert level lowered following decrease in seismicity; diffuse white plumes rose 25m above crater, drifted E.

Okmok (Alaska, USA): 20 Mar 09, alert level lowered following low seismicity and no activity.

Popocatépetl (Mexico): 18-24 Mar 09, steam and ash emissions; 23 Mar 09, explosion ejecting incandescent fragments, plume to 6.7 km a.s.l., drifted E.

Rabaul (Papua New Guinea): 16-20 Mar 09, grey ash plumes from Tavurvur cone to 1.7 km a.s.l., drifted E; incandescence from summit crater observed at night, incandescent tephra occasionally ejected from crater during heightened activity; light ashfall reported downwind.

Sakura-jima (Japan): 20 & 23 Mar 09, explosions reported.

Shiveluch (Kamchatka, Russia): 13-20 Mar 09, seismic activity above background levels, ash plumes likely rose to 3.5 km a.s.l.; 12-14 & 16-19 Mar 09, thermal anomaly on lava dome; 13, 14 & 18 Mar 09, strong fumarolic activity; 14 & 18 Mar 09, incandescence from lava dome seen at night.

Soufrière Hills (Montserrat): 18 Mar 09, pyroclastic flow travelled E down the Tar River Valley and almost reached the sea.

Tungurahua (Ecuador): 17-18 & 22 Mar 09, ash plumes to 5.5-7.5 km a.s.l., drifted W, NW, NNE; 17 & 20 Mar 09, ashfall reported downwind; 21 Mar 09, lahars descended Mapayacu drainage to SW and Mandur drainage to NW.

Ubinas (Peru): 18 Mar 09, plume to 7.9 km a.s.l.

ACKNOWLEDGEMENTS AND DISCLAIMER

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