SI/USGS Weekly Volcanic Activity Report 7-13 October 2009 15 October 2009Posted by admin in activity reports, Arenal, Bagana, Batu Tara, Caribbean, Costa Rica, Dukono, eruptions, Fuego, Hawaii, Indian Ocean, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kizimen, Kliuchevskoi, Papua New Guinea, Piton de la Fournaise, Rabaul, Russia, Sakura-jima, Shiveluch, Soufrière Hills, Suwanose-jima, United States.
Tags: Global Volcanism Program, volcanic activity reports, volcanic eruptions
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The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 7-13 October 2009 is available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.
- The current report: Weekly Volcanic Activity Report.
- Previous reports: Weekly Reports Archive.
- The SI/USGS map of volcanoes discussed this week.
New activity/unrest: Karymsky (Russia), Kizimen (Russia), Kliuchevskoi (Russia), Piton de la Fournaise (Réunion), Sakura-jima (Japan), Shiveluch (Russia), Soufrière Hills (Montserrat).
Ongoing activity: Arenal (Costa Rica), Bagana (Papua New Guinea), Batu Tara (Indonesia), Dukono (Indonesia), Fuego (Guatemala), Kilauea (Hawaii, USA), Rabaul (Papua New Guinea), Suwanose-jima (Japan).
Note: a.s.l. = ‘above sea level’.
Karymsky (Russia). During 2-9 October seismic activity was above background levels, and weak ash explosions were possibly indicated. An ash plume that rose to 3.5 km a.s.l. and drifted SSE was seen on 7 October, and on 9 October an eruption produced a plume that rose to 3 km a.s.l.
Kizimen (Russia). Seismicity began to increase in October, especially on the 9th, and a weak thermal anomaly was detected on 17 and 21 September.
Kliuchevskoi (Russia). During 2-9 October seismic activity was above background levels, with many earthquakes and weak tremor being detected. A weak thermal anomaly was detected over the volcano. Strombolian eruptions ejected tephra 70-100 m above the crater on 2-3 October and fumarolic activity was observed, and on 7 October a fumarolic plume with some ash rose to 5.7 km a.s.l.
Piton de la Fournaise (Réunion). Increased seismicity was reported during 5-6 October, and there was a ‘seismic crisis’ on 7 October. Earthquakes were focused between Bory and Dolomieu craters with deformation detected on the N side of Dolomieu. During 8-13 October seismicity remained above background levels.
Sakura-jima (Japan). Explosions during 7-12 October produced plumes that rose to 1.2-2.7 km a.s.l. and drifted W, SW, S, and SE, and an explosion was detected on 13 October.
Shiveluch (Russia). During 2-9 October seismic activity was above background levels and satellite imagery revealed a large daily thermal anomaly over the lava dome. Fumarolic plumes with small amounts of ash were observed rising to 4 km a.s.l. during 1-3 October. Interpretations of seismic data indicated that ash plumes possibly rose to 6.8 km a.s.l. on 6 October and 4.5 km a.s.l. on other days.
Soufrière Hills (Montserrat). The ash-venting events which begun on 4 October ceased in the early hours of 7 October. A total of thirteen events was recorded, the last three associated with small pyroclastic flows that descended to the NNW. On 7-8 October a small area of incandescence from the N flank of the lava dome was observed. Aerial observations on 9 October revealed that a new lava dome was growing on the S side of the volcano, above the White River valley. Rockfalls and pyroclastic flows occurred during 9-13 October, producing ashfall to the NW on 9-10 October. Pyroclastic flows, some extending up to 2 km from the lava dome, descended to the NNW on 11 and 13 October. Pyroclastic flows occasionally travelled down the White River valley and associated ash clouds moved WNW. On 13 October, seismicity related to small pyroclastic flows traveling NW gradually increased and culminated with the largest event since 4 October, producing a 2 km pyroclastic flow generated by a small collapse of the lava dome. The resulting ash plume rose to 6.1 km a.s.l.
Arenal (Costa Rica). During September Crater C at Arenal produced gas emissions, sporadic Strombolian eruptions, and occasional avalanches descending the W flank. Acid rain and small amounts of ejected pyroclastic material affected the NE and SE flanks and avalanches from lava-flow fronts descended the SW flanks. Crater D produced only fumarolic activity.
Bagana (Papua New Guinea). On 9 October an ash plume rose to 2.4 km a.s.l. and drifting 45 km SW.
Batu Tara (Indonesia). On 6 October an ash plume was observed drifting 65 km W at 2.4 km a.s.l.
Dukono (Indonesia). On 7 October an ash plume rose to 3 km a.s.l. and drifted 74 km NW.
Fuego (Guatemala). Explosions on 9, 12, and 13 October, some accompanied by rumbling sounds and block avalanches, produced ash plumes to 4.1-4.6 km a.s.l. which drifted W. A lahar traveled down the Lajas ravine on 9 October carrying blocks up to 50 cm in diameter.
Kilauea (Hawaii, USA). During 7-13 October lava continued to flow SE through a lava tube system to reach the Waikupanaha ocean entry. Active surface lava flows were revealed in satellite imagery. During 7-10 October intermittent incandescence was seen from Pu’u ‘O’o crater and the East wall vent. The Halema’uma’u crater vent continued to produce a diffuse white plume that drifted mainly SW. Incandescence originated from a source deep inside the vent cavity. A crusted lava pond surface was seen on 13 October. Preliminary measurements indicated that the sulphur dioxide emission rate at the summit remained elevated: the 11 October measurement was 800 tonnes/day (2003-2007 average rate = 140 tonnes/day).
Rabaul (Papua New Guinea). During 2-8 October grey ash plumes from Tavurvur cone rose 2 km above the crater, ashfall was reported in Rabaul town and surrounding areas, incandescence was occasionally visible from the summit crater. An ash plume rose to 2.4 km a.s.l. and drifted 75 km NW on 9 October.
Suwanose-jima (Japan). Explosions were reported on 10 and 11 October. A plume rose to 1.5 km a.s.l. on 10 October.
ACKNOWLEDGEMENTS AND DISCLAIMER
The foregoing is a summary of the Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 7-13 October 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.