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SI/USGS Weekly Volcanic Activity Report 18-24 August 2010 26 August 2010

Posted by admin in activity reports, Ambrym, Batu Tara, Caribbean, Colombia, Dukono, eruptions, Galeras, Hawaii, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Mexico, Nicaragua, Pacific, Pagan, Papua New Guinea, Popocatépetl, Russia, Sakura-jima, San Cristóbal, Sangay, Shiveluch, Soufrière Hills, Suwanose-jima, Ulawun, United States, Vanuatu, Weekly Volcanic Activity Reports.
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Here’s the regular review of the past week’s volcanic activity, compiled by Sally Kuhn Sennert and published by the Global Volcanism Program:

  • Galeras: erupted on 25 August
  • Popocatépetl: produced a 1-km steam plume on 23 August
  • San Cristóbal: a report of a steam plume on 20 August

SI/USGS Weekly Volcanic Activity Report 18-24 August 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 18-24 August 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: Galeras (Colombia).

Ongoing activity: Ambrym (Vanuatu), Batu Tara (Indonesia), Dukono (Indonesia), Karymsky (Russia), Kilauea (Hawaii USA), Kliuchevskoi (Russia), Pagan (Mariana Islands), Popocatépetl (Mexico), Sakura-jima (Japan), San Cristóbal (Nicaragua), Sangay (Ecuador), Shiveluch (Russia), Soufrière Hills (Montserrat), Suwanose-jima (Japan), Ulawun (Papua New Guinea).

Note: a.s.l. = ‘above sea level’.

NEW ACTIVITY/UNREST

Galeras (Colombia). INGEOMINAS reported that an earthquake swarm from Galeras which began on 20 August had been preceded by increased gas emissions a few days prior. During 21-22 August seismicity remained high. Five volcano-tectonic earthquakes were felt by local residents and caused windows to vibrate. They were located within a 300-900 m radius from the crater, at depths of less than 2 km. The largest event was M 4.3. On 23 August a M 4.6 earthquake was located E of Galeras at a depth of 2 km. The Alert Level was raised to II (Orange; ‘probable eruption in term of days or weeks’). An eruption began on 25 August, prompting INGEOMINAS to raise the Alert Level to I (Red; ‘imminent eruption or in progress’). Meteorological cloud cover initially prevented visual observations of the summit, although an eruption plume was seen amongst the clouds, and thermal anomalies were detected by an infrared camera. Ashfall was reported in areas 7-12 km NW. Observers in Pasto (~10 km E) reported that gas-and-ash plumes rose 300 m above the crater. [GVP: Galeras]

ONGOING ACTIVITY

Ambrym (Vanuatu). Based on pilot observations, analyses of satellite imagery, and information from the Vanuatu Geohazards Observatory, the Wellington VAAC reported that on 8 and 10 August ash-and-steam plumes from Ambrym rose to an altitude of 6.1 km (20,000 ft) a.s.l. and drifted W and NW. [GVP: Ambrym]

Batu Tara (Indonesia). Based on analyses of satellite imagery, the Darwin VAAC reported that during 20-23 August ash plumes from Batu Tara drifted 25-65 km NW and W at an altitude of 1.5 km (5,000 ft) a.s.l. [GVP: Batu Tara]

Dukono (Indonesia). Based on analyses of satellite imagery, the Darwin VAAC reported that during 18-22 August ash plumes from Dukono rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted 65-225 km W and NW. [GVP: Dukono]

Karymsky (Russia). KVERT reported that during 13-20 August seismic activity from Karymsky was above background levels and suggested that possible ash plumes rose to an altitude of 3 km (9,800 ft) a.s.l. Satellite imagery showed a thermal anomaly over the volcano during 14-15 August and ash plumes that drifted 100 km E. The Aviation Colour Code level remained at Orange. [GVP: Karymsky]

Kilauea (Hawaii, USA). During 18-24 August 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 floor of Halema’uma’u crater remained mostly stable; glow from the vent was also visible at night. A plume from the vent mainly drifted SW. At Pu’u ‘O’o crater, incandescence emanated from multiple areas on the N floor. At the east rift zone, lava that flowed through the TEB lava-tube system fed occasional surface flows on the pali and on the coastal plain NW and W of Kalapana Gardens, as well as the Puhi-o-Kalaikini ocean entry. [GVP: Kilauea]

Kliuchevskoi (Russia). KVERT reported that 13-20 August seismic activity from Kliuchevskoi was above background levels and lava flowed down the SW flank. Strombolian activity and gas-and-ash emissions were observed during 14-16 August. Cloud cover prevented observations the other days. Satellite imagery analyses showed a large and intense daily thermal anomaly from the volcano and ash plumes that drifted more than 325 km SE. The Aviation Colour Code level remained at Orange. [GVP: Kliuchevskoi]

Pagan (Mariana Islands). Meteorological clouds mostly prevented satellite image views of Pagan during 13-20 August, although steam-and-gas plumes were seen during clear periods. On 15 August, observers working on a boat reported that a low-level ash eruption produced a diffuse, dark-colored ash-and-steam plume. The plume rose to an altitude of 1.5 km (4,900 ft) a.s.l. and caused minor ashfall on northern Pagan Island and the surrounding ocean. The Aviation Colour Code remained at Yellow and the Volcano Alert Level remained at Advisory. [GVP: Pagan]

Popocatépetl (Mexico). CENAPRED reported that on 23 August an ash plume from Popocatépetl rose 1 km above the crater. [GVP: Popocatépetl]

Sakura-jima (Japan). Based on information from JMA, the Tokyo VAAC reported that explosions from Sakura-jima on 18, 21, and 23 August produced plumes that rose to altitudes of 1.8-2.4 km (6,000-8,000 ft) a.s.l. and drifted W and NW. On 19 and 24 August pilots observed ash plumes that rose to altitudes of 1.5-2.7 km (5,000-9,000 ft) a.s.l. [GVP: Sakura-jima]

San Cristóbal (Nicaragua). Based on analyses of satellite imagery, the Washington VAAC reported that on 20 August an ash plume from San Cristóbal drifted over 35 km N. [GVP: San Cristóbal]

Sangay (Ecuador). Based on analyses of satellite imagery, the Washington VAAC reported that on 19 August small ash-and-gas plumes from Sangay drifted about 25 km W and dissipated. Intermittent thermal anomalies were also detected. On 20 August a pilot reported an emission that was not seen in satellite imagery. [GVP: Sangay]

Shiveluch (Russia). KVERT reported that during 13-20 August seismic activity from Shiveluch was above background levels and gas-and-steam plumes were seen during 14-16 August. A daily thermal anomaly was seen in satellite imagery. Based on information from KEMSD, the Tokyo VAAC reported that during 22-23 August eruptions produced plumes that rose to altitudes of 6.4-8.5 km (21,000-28,000 ft) a.s.l. The Aviation Colour Code level remained at Orange. [GVP: Shiveluch]

Soufrière Hills (Montserrat). MVO reported most of the rockfalls and pyroclastic flows detected during 13-20 August originated from the W side of the lava dome and traveled W down Gages valley. The pyroclastic flows traveled no longer than 2 km and produced weakly convecting ash clouds. A small lahar descended the Belham valley to the NW on 19 August. The Hazard Level remained at 3. [GVP: Soufrière Hills]

Suwanose-jima (Japan). Based on information from JMA, the Tokyo VAAC reported explosions from Suwanose-jima during 21-24 August. Details of possible resulting plumes were not reported. [GVP: Suwanose-jima]

Ulawun (Papua New Guinea). RVO reported that white and grey-to-brown plumes rose no more than a few hundred meters above Ulawun during 12-24 August, and fine ash fell on the NW and W flanks. Seismicity continued to decrease as compared to previous weeks. [GVP: Ulawun]

The foregoing is a summary of the Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 18-24 August 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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