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SI/USGS Weekly Volcanic Activity Report, 15 April 2009 – 21 April 2009 23 April 2009

Posted by admin in activity reports, Alaska, Batu Tara, Chaitén, Chile, Colombia, Ebeko, Ecuador, eruptions, Fernandina, Galapagos, Hawaii, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Koryaksky, Nevado del Huila, Pacific, Paluweh, Papua New Guinea, Rabaul, Redoubt, Russia, Shiveluch, Suwanose-jima, Tungurahua, United States.
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SI/USGS Weekly Volcanic Activity Report 15 April 2009 - 21 April 2009

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 15 April 2009 to 21 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), Fernandina (Galapagos Islands, Ecuador), Kliuchevskoi (Kamchatka, Russia), NW Rota-1 (Mariana Islands), Pagan (Mariana Islands), Paluweh (Lesser Sunda Islands, Indonesia).

Ongoing activity: Batu Tara (Komba Island, Indonesia), Chaitén (Chile), Karymsky (Kamchatka, Russia), Kilauea (Hawaii, USA), Koryaksky (Kamchatka, Russia), Nevado del Huila (Colombia), Rabaul (Papua New Guinea), Redoubt (Alaska, USA), Shiveluch (Kamchatka, Russia), Suwanose-jima (Japan), Tungurahua (Ecuador).

NEW ACTIVITY

Ebeko (Paramushir Island). Continuing activity has been reported from Ebeko during 10-17 April: gas-and-steam plumes with some ash content rose to 2.7 km a.s.l., and an ash plume was reported drifting NE at 3 km a.s.l. on 17 April.

Fernandina (Galapagos Islands, Ecuador). Gas-and-steam plumes were reported drifting up to 555 km W of Fernandina and a thermal anomaly was detected.

Kliuchevskoi (Kamchatka, Russia). Seismic activity was reportedly above background levels on 11 April, gas-and-ash plumes were detected 9 and 10 April, a weak thermal anomaly was detected over the volcano on 14 April, and fumarolic activity was seen on 15 and 16 April.

NW Rota-1 (Mariana Islands). Scientists observed the volcano erupting about 520 m below the ocean surface. The volcano appears to have grown about 40 m since 2006.

Pagan (Mariana Islands). Intermittent steam plumes to 1.8 km a.s.l. were reported on 15 April and drifted 37 km W; a diffuse plume drifted 85 km W on 16 April

Paluweh (Lesser Sunda Islands, Indonesia). Seismic activity increased during 1-17 April.

ONGOING ACTIVITY

Batu Tara (Komba Island, Indonesia). Ash plumes were detected 15-16 April 2009 rising to 1.8-2.4 km a.s.l. and drifting 35-75 km W and NW.

Chaitén (Chile). Seismicity from the dome complex continued to increase 12-16 April, with M 4-4.5 earthquakes every 2-3 hours; increased incandescence and gas-and-ash plumes of increased width and rising to 1.5 km above the domes were seen from the dome complex. During 16 and 18-19 April ash plumes were detected to 1.8-2.4 km a.s.l., drifting SE and N.

Karymsky (Kamchatka, Russia). The report is that there is no report: ‘seismic activity at Karymsky was not analyzed during 9-17 April due to technical reasons. Cloud cover prevented observations on the other days’.

Kilauea (Hawaii, USA). Lava continued flowing SE through the tube system to reach the ocean at Waikupanaha (occasional explosions here) and Kupapa’u ocean entries, and surface flows were present. The vent in Halema’uma’u crater continued to produce a mainly white plume with occasional brown that drifted mainly SW, incandescence was intermittently seen. Sulphur dioxide emission at Kilauea summit was elevated, reaching 7000 tonnes/day on 15 April (2003-7 average = 140 tonnes/day).

Koryaksky (Kamchatka, Russia). Seismic activity was above background levels 10-17 April, and gas-and-ash plumes drifting 30-680 km in multiple directions were detected through satellite imagery. Ash plumes reaching 3.7-4.6 km a.s.l. were reported during 18-21 April.

Nevado del Huila (Colombia). Gas plumes from the lava dome rose to 6.9 km a.s.l. maximum and drifted W during 15-21 April. During an overflight on 19 April intense degassing was observed, producing whitish and bluish plumes. Thermal anomalies were detected on N and S of dome.

Rabaul (Papua New Guinea). White and grey plumes rose 1-2 km above the crater of Tavurvur cone during 10-17 April and drifted SE and NW. At night the crater roared and glowed. Rabaul town and surrounding areas reported ashfall.

Redoubt (Alaska, USA). Ongoing lava dome growth kept seismicity at Redoubt remained elevated during 15-21 April, and vigorous steam-and-gas plumes (possibly with occasional small amounts of ash) rose to altitudes below 4.6 km a.s.l. Satellite imagery revealed thermal anomalies at the summit and drifting SO2 plumes. The lava dome size was estimated on 16 Aril to be 500 x 700 m across and at least 50 m thick.

Shiveluch (Kamchatka, Russia). Seismic activity reportedly above background levels during 10-17 April, and ash plumes likely rose to 4.5-7.5 km a.s.l. A daily thermal anomaly was detected on the lava dome, on 13 April ash plumes drifted ~50 km NW, fumaroles were active on 15 and 16 April, and eruptions on 19 and 22 April produced plumes to 4.6-5.2 km a.s.l.

Suwanose-jima (Japan). An explosion was reported on 21 April.

Tungurahua (Ecuador). On 15 April a steam-and-gas plume rose 100 m above the crater; on 18 April an ash plume rose 1 km above the crater and drifted NW. Ashfall was reported to the SW and N during 15-16 and 18-19 April.

ACKNOWLEDGEMENTS AND DISCLAIMER

The foregoing is a summary of the Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 15 April to 21 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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