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SI/USGS Weekly Volcanic Activity Report 11-17 November 2009 19 November 2009

Posted by admin in activity reports, Arenal, Bagana, Caribbean, Chaitén, Chile, Colombia, Costa Rica, Ecuador, eruptions, Fuego, Galeras, Guatemala, Hawaii, Japan, Kamchatka, Karymsky, Kilauea, Kizimen, Kliuchevskoi, Mayon, Mexico, Nevado del Huila, Papua New Guinea, Popocatépetl, Rabaul, Reventador, Russia, Sakura-jima, Sangay, Santa María, Shiveluch, Soufrière Hills, Suwanose-jima, United States.
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SI/USGS Weekly Volcanic Activity Report 11-17 November 2009

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The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 11-17 November 2009 is available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity/unrest: Galeras (Colombia), Mayon (Philippines).

Ongoing activity: Arenal (Costa Rica), Bagana (Papua New Guinea), Chaitén (Chile), Fuego (Guatemala), Karymsky (Russia), Kilauea (Hawaii, USA), Kizimen (Russia), Kliuchevskoi (Russia), Nevado del Huila (Colombia), Popocatépetl (Mexico), Rabaul (Papua New Guinea), Reventador (Ecuador), Sakura-jima (Japan), Sangay (Ecuador), Santa María (Guatemala), Shiveluch (Russia), Soufrière Hills (Montserrat), Suwanose-jima (Japan).

Note: a.s.l. = ‘above sea level’.

NEW ACTIVITY/UNREST

Galeras (Colombia). On 14 November an overflight revealed thermal anomalies reaching 110°C in the main crater and very low rates of gas discharge. The Alert Level remained at Orange, ‘eruption likely within the next few days or weeks’.

Mayon (Philippines). On 11 November an explosion prompted an evacuation of about 700 families from areas near the volcano. Crater incandescence at night was visible from 15 km away on 14 November.

ONGOING ACTIVITY

Arenal (Costa Rica). During October activity from Crater C consisted of gas emissions, sporadic Strombolian eruptions, and occasional avalanches that traveled down the W and SW flanks. Acid rain and small amounts of ejected pyroclastic material affected the NE and SE flanks. Avalanches from lava-flow fronts traveled down the SW flanks. Crater D produced only fumarolic activity.

Bagana (Papua New Guinea). Darwin VAAC reported that an ash plume rose to 3 km a.s.l. and drifted 65 km SW on 12 November.

Chaitén (Chile). During 31 October-1 November the lava-dome complex produced steam plumes sometimes containing gas and ash which rose no more than 1 km above the lava domes. The Alert Level remained at Red.

Fuego (Guatemala). Washington VAAC reported that a gas plume possibly containing ash drifted SSW on 12 November. Explosions on 13 November produced ash plumes that rose 4.2-4.7 km a.s.l. and drifted 7 km S. Rumbling noises and incandescence were detected. White fumarolic plumes rose 100 m and drifted S and SW. Small plumes of ash on 16 November were seen on satellite imagery.

Karymsky (Russia). During 5-9 November seismic activity was above background levels, possibly indicating that ash plumes rose to 3.7 km a.s.l. Analyses of satellite imagery during 5-12 November revealed almost daily thermal anomalies and ash plumes that drifted 190 km E during 8-12 November. The Level of Concern Color Code remained at Orange. Tokyo VAAC reported that an ash plume rose to an altitude of 3.7 km a.s.l. and drifted E on 14 November.

Kilauea (Hawaii, USA). During 11-17 November lava flowed SE from underneath the Thanksgiving Eve Breakout (TEB) and rootless shield complex through a lava tube system to reach the ocean at multiple locations between Waikupanaha and an area 700 m farther to the W. Thermal anomalies detected by satellite suggested active surface lava flows. Incandescence was seen on the Pu’u ‘O’o crater floor and intermittently from an East wall vent. The vent in Halema’uma’u crater continued to produce a diffuse white plume that drifted W and SW. Incandescence originated from a spattering lava pond inside the vent cavity. Measurements indicated that the sulfur dioxide emission rate at the summit remained elevated: 600 tonnes/day was measured on 16 November (2003-2007 average rate = 140 tonnes/day).

Kizimen (Russia). Seismicity was slightly above background levels on 6, 8, and 10 November and at background levels the other days during 7-13 November. The Level of Concern Colour Code was lowered to Green.

Kliuchevskoi (Russia). Seismic activity from Kliuchevskoi was above background levels during 6-13 November. Strombolian activity ejected tephra 300 m above the crater on 5, 7, and 10 November. Satellite imagery revealed a large daily thermal anomaly at the volcano. The Level of Concern Color Code remained at Orange.

Nevado del Huila (Colombia). During 11-17 November gas plumes from Nevado del Huila were seen on the web camera rising 2.5 km and drifting downwind. Ash plumes sometimes accompanied the gas emissions on 12, 13, and 15 November. Based on analyses of satellite imagery, the Washington VAAC reported that during 11-16 November thermal anomalies were seen intermittently through cloud cover. The Alert Level remained at Orange, ‘eruption likely within the next few days or weeks’).

Popocatépetl (Mexico). On 14 November an ash plume to 7.4 km a.s.l. During 14-17 November, steam-and-gas plumes sometimes contained ash.

Rabaul (Papua New Guinea). Darwin VAAC reported that ash plumes from Tavurvur cone rose to 2.4 km a.s.l. and drifted 75-150 km NW and W during 11-14 November.

Reventador (Ecuador). Washington VAAC reported that ash plumes from Reventador drifted 10-20 km WNW and W on 14 November. An intermittent thermal anomaly was also detected.

Sakura-jima (Japan). Tokyo VAAC reported that explosions during 11-13 and 15-17 November produced plumes that rose to 1.5-2.4 km a.s.l. and drifted in multiple directions.

Sangay (Ecuador). Washington VAAC reported that small plumes possibly with ash drifted WNW on 16 November. A thermal anomaly was also detected.

Santa María (Guatemala). An explosion from the Santiaguito lava dome complex produced a plume that drifted SW on 13 November. Avalanches descended the SW flank of the dome. Washington VAAC reported that on 16 November multiple ash plumes drifted WSW.

Shiveluch (Russia). During 6-13 November seismic activity was above background levels, possibly indicating that ash plumes rose to 5.5 km a.s.l. On 5 November ash plumes rose to 4.2 km a.s.l. and hot avalanches were noted during 10-12 November. Analyses of satellite imagery revealed a large daily thermal anomaly on the lava dome and ash plumes that drifted 320 km E on 11 November. Tokyo VAAC reported that on 14 November an eruption produced a plume that rose to an altitude of 4.9 km a.s.l. The Level of Concern Colour Code remained at Orange.

Soufrière Hills (Montserrat). Activity from the lava dome continued at a high level during 6-13 November, with pyroclastic flows mainly occurring towards the W down Gages Valley and SW down Gingoes Ghaut. Observations on 9 and 10 November revealed that recent lava-dome growth was concentrated on the WSW side, immediately NE of Chances Peak, and intense incandescence and rockfalls were noted at night. Ash fell across the Montserrat on 11 November, and about 6-8 km NW in Salem, Old Towne, Olveston, and Woodlands on 12 November. The largest pyroclastic flow during the reporting period descended WSW on 12 November and nearly reached the sea at Kinsale village. The Hazard Level remained at 3.

Suwanose-jima (Japan). Tokyo VAAC reported explosions on 12 and 16 November. Details of possible resulting emissions were not reported.

ACKNOWLEDGEMENTS AND DISCLAIMER

The foregoing is a summary of the Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 11-17 November 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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