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SI/USGS Weekly Volcanic Activity Report, 27 May-2 June 2009 4 June 2009

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SI/USGS Weekly Volcanic Activity Report 27 May-2 June 2009

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 27 May-2 June 2009 is available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity: Karangetang (Indonesia), Makian (Indonesia), Slamet (Indonesia).

Ongoing activity: Bagana (Papua New Guinea), Batu Tara (Indonesia), Chaitén (Chile), Dukono (Indonesia), Etna (Italy), Kilauea (USA), Llaima (Chile), Nevado del Huila (Colombia), Popocatépetl (Mexico), Rabaul (Papua New Guinea), Redoubt (USA), Sakura-jima (Japan), Shiveluch (Russia), Soufrière Hills (Montserrat), Tungurahua (Ecuador), Ubinas (Peru).

NEW ACTIVITY

Karangetang [Api Siau] (Indonesia). Increased activity and evacuations: seismicity and tremor increased and white emissions up to 100 m high and incandescence were observed on 30-31 May. Incandescent material descended, mainly on the S flank, as far as 2.3 km, and ash plumes (accompanied by ‘thunderous sounds) rose 25-700 m. [GVP profile: Karangetang]

Makian (Indonesia). Seismicity increased over 28 May-2 June, with little, if any, apparent increases in emissions. [GVP profile: Makian]

Slamet (Indonesia). An ash plume reportedly rose to 4.3 km a.s.l. on 27 May; satellite imagery indicated a
possible plume to 6.1 km a.s.l., but the presence of ash was unconfirmed. [GVP profile: Slamet]

ONGOING ACTIVITY

Bagana (Papua New Guinea). An ash plume reported rose to 2.4 km a.s.l. and drifted 75 km W on 2 June. [GVP profile: Bagana]

Batu Tara (Indonesia). An ash plume reportedly rose to 2.4 km a.s.l. and drifted 25-75 km NW, W and SW over 27 May-2 June, and a thermal anomaly was identified on satellite imagery on 29 May. [GVP profile: Batu Tara]

Chaitén (Chile). During 20-27 May gas-and-ash plumes rose 1.5 km above the lava-dome complex, and block-and-ash flows were generated by collapses on unstable slopes. Seismicity remained elevated, with the hypocentres of the larger hybrid earthquakes situated at 5-9 km depths beneath the western sector of the lava dome complex. Over 28-29 May
and 1-2 June ash plumes rose to 1.8-2.4 km a.s.l., and thermal anomalies were also detected in satellite imagery. [GVP profile: Chaitén]

Dukono (Indonesia). Ash plumes reportedly rose to 3 km a.s.l. and drifted 55-110 km NE over 27-28 May. [GVP profile: Dukono]

Etna (Italy). At least three lava flows were active from the NW-SE-trending fissure E of the Etna summit craters during 25-31 May . There was degassing from the Northeast Crater, the NW and SE Bocca Nuova vents, from the E flank of the Southeast Crater, and along summit fumarolic fields. [GVP profile: Etna]

Kilauea (USA). Lava continued to flow SE to the Waikupanaha ocean entry during 27 May-2 June, and the Kupapa’u ocean entry until 31 May. A thermal anomaly was detected on 30 May, and the presence of active surface lava flows was confirmed on 2 June. The Halema’uma’u crater vent continued to produce a mainly white plume with occasional hints of brown that drifted mainly SW. A molten lava pool deep below the floor of the vent produced variable incandescence. [GVP profile: Kilauea]

Llaima (Chile). An area of elevated temperature 2 km square on the E flank was observed during an overflight on 1 June. Several small areas were emitting gas, a small cone was forming about 800 m below the crater, and an E-W trending 300-metre-long fissure emitting brown ash and steam plumes from various points was observed 200 m from the rim of the main crater. There was weak fumarolic activity in the summit crater. [GVP profile: Llaima]

Nevado del Huila (Colombia). On 28 May there was a seismic swarm that included earthquakes of magnitudes 4 and 4.8. A tremor episode on 31 May was associated with an ash emission, and another pulse of tremor was registered on 2 June. [GVP profile: Nevado del Huila]

Popocatépetl (Mexico). Over 27 May-2 June steam and gas emissions were visible, with slight ash content during 27-29 May. [GVP profile: Popocatépetl]

Rabaul (Papua New Guinea). White and occasionally blue plumes from Tavurvur cone rose 1 km above the crater, and incandescence was visible from the crater at night, during 21-28 May. [GVP profile: Rabaul]

Redoubt (USA). Seismicity remained at low (but above background) levels over 27 May-2 June, with small earthquakes and rockfalls being registered. The lava dome continues to grow and its instability means it could collapse ‘at any moment’. [GVP profile: Redoubt]

Sakura-jima (Japan). An explosion on 30 May produced a plume to 4.6 km a.s.l. and drifted SE, on 31 May an
ash plume rose to 3 km a.s.l., and on 1 June eruptions produced plumes to 2.1-3.4 km a.s.l. [GVP profile: Sakura-jima]

Shiveluch (Russia). Seismic activity was above background levels during 22-29 May, and steam-and-gas emissions were observed over 21-23 May with gas-and-steam plumes containing small amounts of ash rising to 4 km on 22 May. A daily thermal anomaly over the lava dome was detected on satellite imagery. [GVP profile: Shiveluch]

Soufrière Hills (Montserrat). Activity was at a low level during 22-29 May, with a rockfall possibly with a small explosion on 23 May and a small pyroclastic flow descending 1 km E on 24 May and producing an ash plume that drifted W. [GVP profile: Soufrière Hills]

Tungurahua (Colombia). During 26-28 May strombolian activity was observed at night, with nocturnal incandescence continuing to be visible at the crater through 1 June. Thermal anomalies were detected on satellite imagery during 27-29 and 31 May; steam-and-ash plumes rose to 7 km a.s.l. and drifted W and SW on 28 May, blocks rolled 1 km down the flanks, and ashfall was reported downwind on 28-30 May. The volcano was characteristically noisy, with reports of rumbles and cannonades. [GVP profile: Tungurahua]

Ubinas (Peru). Eruptions on 29 and 31 May produced ash plumes to 5.5-6.7 km a.s.l. which drifted NE and SW. An explosion on 2 June produced gas-and-ash plumes that rose 0.9-1.5 km and drifted E. [GVP profile: Ubinas]

ACKNOWLEDGEMENTS AND DISCLAIMER

The foregoing is a summary of the Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 27 May-2 June 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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