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SI/USGS Weekly Volcanic Activity Report, 1 April 2009 – 7 April 2009 16 April 2009

Posted by admin in activity reports, Africa, Alaska, Batu Tara, Caribbean, Chile, Colombia, Congo (Dem. Rep.), Ebeko, eruptions, Galeras, Guatemala, Hawaii, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Koryaksky, Krakatau, Llaima, Mexico, Nyamuragira, Nyiragongo, Pacaya, Popocatépetl, Redoubt, Russia, Sakura-jima, Shiveluch, Soufrière Hills, Suwanose-jima, Tungurahua, United States.
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SI/USGS Weekly Volcanic Activity Report 1 April 2009 - 7 April 2009

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 1 April 2009 to 7 April 2009 is available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity: Ebeko (Paramushir Island), Krakatau (Indonesia) Llaima (Chile), Nyamuragira (Democratic Republic of Congo), Nyiragongo (Democratic Republic of Congo), Pacaya (Guatemala), Redoubt (Alaska).

Ongoing Activity: Asama (Japan), Batu Tara (Komba Island, Indonesia), Galeras (Colombia), Karymsky (Kamchatka, Russia), Kilauea (Hawaii, USA), Koryaksky (Kamchatka, Russia), Popocatépetl (Mexico), Rabaul (Papua New Guinea), Sakura-jima (Japan), Shiveluch (Kamchatka, Russia), Soufrière Hills (Montserrat), Suwanose-jima (Japan), Tungurahua (Ecuador).

NEW ACTIVITY

Ebeko (Paramushir Island): 3 Apr 09, alert level raised to Yellow; ash-and-gas plumes to 3.2 km a.s.l., drifted ~20 km NW and E; 13, 29 & 31 Mar 2009, ashfall up to 0.2 cm thick reported in Severo-Kurilsk, 7 km E

Krakatau (Indonesia): 27-30 Mar & 1 Apr 09, ash plumes to 200-800 m above Anak Krakatau crater; 2 Apr 09, ash eruption reported, resulting ash plume drifted more than 60 km S.

Llaima (Chile): 2-3 Apr 09, increase in frequency and amplitude of seismicity evolving into continuous seismic tremor, steam plumes with small amounts of ash emitted; late on 3 Apr 09, incandescence from main crater, weak strombolian explosions from northern cone within the crater; 4 Apr 09, strombolian activity and rhythmic explosions in the main crater originated from two nested pyroclastic cones, incandescent tephra ejected 700 m above crater; ashfall in Conguillío National Park, lava flow 1 km long traveled W towards the Calbuco River; 5 & 6 Apr 09, dark grey ash plume drifted E, continuous explosions, heavy ashfall to the E, lahars and lava flows reported; 7 Apr 09, gas-and-ash plume to 1 km above summit, drifted NE.

Nyamuragira (Democratic Republic of Congo): 23-27 Jan 09, seismic swarm reported, with increased seismicity along the East African Rift since then; 22 & 24 Mar 09, intense fumarolic activity in the summit crater of Nyamuragira observed, concentrated in southern area.

Nyiragongo (Democratic Republic of Congo): seismic swarm reported from Nyiragongo and Nyamuragira in January and increased seismicity along the East African Rift since then; frequent gas plumes, contributed to acid rain; 22 Mar 09, tremor detected; 22 & 24 Mar 09, active fumaroles observed along a fissure connecting the Shaheru (S flank) and Nyiragongo craters, strong methane concentrations detected, lava lake level had dropped 20 m and temperature of some fissures had risen by 4 degrees C compared to 27 February; a small area of the lava lake was active, lava fountains seen.

Pacaya (Guatemala): constant explosive activity from McKenney cone in late March and early April, vigorous degassing, strombolian explosions ejecting material 25 m into the air, lava flows descended W and SW flanks up to 300m.

Redoubt (Alaska): 1-3 Apr 09, continuing emission of steam, gases and small amounts of ash; 1 & 2 Apr 09, plume containing some ash to 4.6-7.6 km a.s.l., extended about 65 km ENE; 4 Apr 09, explosion produced ash plume to 15.2 km a.s.l., drifted SE, lahar descended Drift River valley; 5-6 Apr 09, small earthquakes and intermittent tremor continued, plume of primarily steam and gas continuously emitted to 7.7 km a.s.l., drifted SE; 6 Apr 09, gas-and-steam plume to under 7.7 km a.s.l., drifted NE; 7 Apr 09, small steam-and-ash plume to 4.6-6.1 km a.s.l., drifted 16-24 km SE.

ONGOING ACTIVITY

Asama (Japan): 7 Apr 09, Alert Level lowered from 3 to 2 (on a scale of 1-5).

Batu Tara (Komba Island, Indonesia): 5-6 Apr 09, ash plumes to 2.4 km a.s.l., drifted 40-210 km W.

Galeras (Colombia): 3-7 Apr 09, gas plumes, sometimes with ash content, originating from different areas in the main crater, to under 6 km a.s.l., and zones of high temperatures noted.

Karymsky (Kamchatka, Russia): 27 Mar – 3 Apr 09, seismic activity above background levels; 31 Mar 09, thermal anomaly detected.

Kilauea (Hawaii, USA): 1-7 April, lava flowed SE through lava tube system to reach Waikupanaha and Kupapa’u ocean entries, surface flows detected, occasional explosions at Waikupanaha ocean entry; Halema’uma’u vent continued to produce mainly white plume drifting SW, incandescence intermittently seen from the vent

Koryaksky (Kamchatka, Russia): 27 Mar – 3 Apr 09, seismic activity at background levels, gas plumes with small amount of ash to 4 km a.s.l., drifted E, SE, S, and W; 27-28, & 31 Mar & 1-2 Apr 09, gas-and-ash plumes drifted 313 km E, in southerly directions.

Popocatépetl (Mexico): 1 Apr 09, ash plume rose 1 km above the summit; 2 Apr 09, small ash emission observed.

Rabaul (Papua New Guinea): 27 Mar – 2 Apr 09, white and occasionally grey (or brown) plumes from Tavurvur cone rose 1 km above the crater, drifted SE and NW; incandescence from summit crater seen at night; 2 Apr 09, light ashfall reported in Rabaul town (3-5 km NW) and surrounding areas; 5 apr 09, ash plume to 2.4 km a.s.l., drifted ~ 37 km NE; 7 Apr 09, ash plumes to 3 km a.s.l., drifted NW.

Sakura-jima (Japan): 5-7 Apr 09, explosions and eruptions produced plumes to 2.1-3.0 km a.s.l., drifted SE (5 Apr 09) and S (7 Apr 09).

Shiveluch (Kamchatka, Russia): 27 Mar – 3 Apr 09, seismicity above background, ash plumes likely rose to 5.5 km a.s.l., fumaroles active daily; 31 March 09, explosions produced ash plumes to 6 km a.s.l.; 1 Apr 09, daily thermal anomaly detected, ash plume drifted 80 km S.

Soufrière Hills (Montserrat): 27 Mar – 3 Apr 09, activity at a low level; 1 Apr 09, small pyroclastic flow traveled E down Tar River Valley; 6 Apr 09, ash plume drifting at 2.7-4.9 km a.s.l. reported.

Suwanose-jima (Japan): 6 Apr 09, explosions reported.

Tungurahua (Ecuador): 1-3 & 5 Apr 09, steam or steam-and-ash plumes rose to maximum 1 km above crater, drifted S, SW, and NNW; 6 Apr 09, fumarolic plumes to 500-600 m; light ashfall reported SW.

ACKNOWLEDGEMENTS AND DISCLAIMER

The foregoing is a summary of the Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 1 April to 7 April 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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