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SI/USGS Weekly Volcanic Activity Report 15-21 September 2010 23 September 2010

Posted by admin in activity reports, Alaska, Batu Tara, Chile, Cleveland, Colombia, Dukono, Ecuador, eruptions, Hawaii, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Machín, Manam, Papua New Guinea, Planchón-Peteroa, Russia, Sakura-jima, Sangay, Shiveluch, Sinabung, Suwanose-jima, United States, Weekly Volcanic Activity Reports.
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Here is the Weekly Volcanic Activity Report for 15-21 September 2010, published by the Global Volcanism Program and compiled by Sally Kuhn Kennert. Some highlights:

  • Cleveland: a thermal anomaly has been detected
  • Machín: elevated seismic activity including shallow volcanic-tectonic earthquakes beneath the lava dome
  • Planchón-Peteroa: an ash plume reached an altitude of 6.1 km

SI/USGS Weekly Volcanic Activity Report 15-21 September 2010

Click on the map for a larger version (1280 x 898 pixels).

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 15-21 September 2010 is now available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity/unrest: Cleveland (Alaska, USA), Kliuchevskoi (Russia), Machín (Colombia), Manam (Papua New Guinea), Planchón-Peteroa (Chile), Sinabung (Indonesia).

Ongoing activity: Batu Tara (Indonesia), Dukono (Indonesia), Karymsky (Russia), Kilauea (Hawaii, USA), Sakura-jima (Japan), Sangay (Ecuador), Shiveluch (Russia), Suwanose-jima (Japan).

Note: a.s.l. = ‘above sea level’.

NEW ACTIVITY/UNREST

Cleveland (Alaska, USA). AVO reported that on 15 September a thermal anomaly from Cleveland was detected in satellite imagery. Cloud cover prevented views of the volcano during 16-21 September. The Volcano Alert Level remained at Advisory and the Aviation Colour Code remained at Yellow. No current seismic information was available because Cleveland does not have a real-time seismic network. [GVP: Cleveland]

Kliuchevskoi (Russia). KVERT reported that during 10-17 September seismic activity from Kliuchevskoi was above background levels and lava flowed down the SW flank. Satellite imagery analyses showed a large and intense daily thermal anomaly over the volcano. During 9-15 September ash plumes rose to altitudes of 6-7 km (19,700-23,000 ft) a.s.l. and drifted 575 km S and SE based on analyses of satellite imagery and visual observations. Strombolian activity was seen on 11 September. Based on analyses of satellite imagery and information from KEMSD, the Tokyo VAAC reported that possible eruptions on 21 and 22 September produced ash plumes that rose to altitudes of 5.2-6.1 km (17,000-20,000 ft) a.s.l. and drifted E. The Aviation Colour Code level remained at Orange. [GVP: Kliuchevskoi]

Machín (Colombia). According to INGEOMINAS, Observatory Vulcanológico and Sismológico de Manizales reported increased seismicity from Cerro Machín on 17 September. About 140 volcano-tectonic earthquakes as large as M 1.85 were located S and SW of the main lava dome at depths of 2-4 km. The Alert level remained at III (Yellow; “changes in the behavior of volcanic activity”). [GVP: Machín]

Manam (Papua New Guinea). RVO reported that during 5-7 September ash plumes were seen rising from Manam’s South Crater when the weather did not prevent observations. Light ashfall was reported on the NW part of the island. Variable amounts of white vapor that was sometimes tinted blue rose from Main Crater. [GVP: Manam]

Planchón-Peteroa (Chile). According to NASA’s Earth Observatory, a satellite image of Planchón-Peteroa shows an ash plume drifting 22 km SE on 18 September and ashfall on the snow beneath the plume. The Buenos Aires VAAC reported that according to a SIGMET issued on 21 September an ash plume rose to an altitude of 6.1 km (20,000 ft) a.s.l and drifted SE. Ash was not identified in satellite imagery. The Alert Level remained at 4, Yellow. [GVP: Planchón-Peteroa]

Sinabung (Indonesia). Based on information from CVGHM and views through a web camera, the Darwin VAAC reported that during 15-18 September ash plumes from Sinabung rose to an altitude of 4.3 km (14,000 ft) a.s.l. and drifted W. CVGHM reported a slow rate of inflation during 15-18 September followed by deflation during 19-21 September. Fog mostly prevented visual observations. On 20 September diffuse white plumes rose 30 m above the crater and drifted NE. The Alert Level remained at 4 (on a scale of 1-4). [GVP: Sinabung]

ONGOING ACTIVITY

Batu Tara (Indonesia). Based on analyses of satellite imagery, the Darwin VAAC reported that during 18-20 September ash plumes from Batu Tara rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted 35-95 km W and NW. [GVP: Batu Tara]

Dukono (Indonesia). Based on analyses of satellite imagery, the Darwin VAAC reported that 15-18 and 20 September ash plumes from Dukono rose to an altitude of 2.4 km (8,000 ft) a.s.l. The plumes drifted 90-260 km NW and W during 17-18 and 20-21 September. [GVP: Dukono]

Karymsky (Russia). KVERT reported that during 10-17 September seismic activity from Karymsky was above background levels, and suggested that possible ash plumes rose to an altitude of 3.2 km (10,500 ft) a.s.l. on 15 September. Satellite imagery showed a thermal anomaly over the volcano during 10-11 and 14 September. The Aviation Colour Code level remained at Orange. [GVP: Karymsky]

Kilauea (Hawaii, USA). During 15-21 September HVO reported that activity at Kilauea continued from the summit caldera and the east rift zone. At the summit caldera, the level of the lava-pool surface in the deep pit within the Halema’uma’u crater remained mostly stable at about 160 m below the crater floor; periodically the lava rose 20-40 m above the stable surface level. Glow from the vent was also visible at night. A plume from the vent drifted SW and deposited ash nearby. At Pu’u ‘O’o crater, incandescence emanated from a lava flow on the SW floor during 16-19 September. At the east rift zone, lava that flowed through the TEB lava-tube system mainly fed the Puhi-o-Kalaikini ocean entry. Weak thermal anomalies detected in satellite imagery during 17-19 September suggested little to no lava flow activity on the pali or the coastal plain. [GVP: Kilauea]

Sakura-jima (Japan). Based on information from JMA, the Tokyo VAAC reported an eruption from Sakura-jima on 15 September. That same day a pilot observed an ash plume at an altitude of 3 km (10,000 ft) a.s.l. On 16 September a pilot reported that an ash plume rose to an altitude of 1.8 km (6,000 ft) and drifted SE. [GVP: Sakura-jima]

Sangay (Ecuador). The Washington VAAC reported that on 21 September an ash plume from Sangay rose to an altitude of 7.6 km (25,000 ft) a.s.l. and was observed by a pilot. Ash was not seen in satellite imagery, although weather clouds were in the area. [GVP: Sangay]

Shiveluch (Russia). KVERT reported that during 10-17 September seismic activity from Shiveluch was above background levels and suggested that possible ash plumes rose to an altitude of 4.5 km (14,800 ft) a.s.l. Satellite imagery analysis showed a thermal anomaly on the volcano. Gas-and-ash plumes were observed during 12-15 September; clouds prevented observations on the other days. The Aviation Colour Code level remained at Orange. [GVP: Shiveluch]

Suwanose-jima (Japan). Based on information from JMA, the Tokyo VAAC reported explosions from Suwanose-jima during 19-21 September. Details of possible resulting plumes were not reported. [GVP: Suwanose-jima]

The foregoing is a summary of the Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 15-21 September 2010. 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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