SI/USGS Weekly Volcanic Activity Report 11-17 August 2010 18 August 2010Posted by admin in activity reports, Bagana, Batu Tara, Caribbean, Costa Rica, Dukono, El Salvador, eruptions, Fuego, Guatemala, Hawaii, Indonesia, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Manam, Papua New Guinea, Russia, San Miguel, Shiveluch, Soufrière Hills, Turrialba, Ulawun, United States, Weekly Volcanic Activity Reports.
Tags: Global Volcanism Program
Some highlights from the Global Volcanism Program Weekly Volcanic Activity Report for 11-17 August 2010, compiled by Sally Kuhn Sennert:
- San Miguel: seismicity increases and then declines, access restrictions remain in place
- Fuego: explosions throw up ash plumes to nearly 5 km altitude
- Turrialba: ash emissions; a 10-km wide plume seen on satellite imagery
Click on the map for a larger version (1280 x 898 pixels).
The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 11-17 August 2010 is now 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: Kilauea (Hawaii, USA), Manam (Papua New Guinea), San Miguel (El Salvador).
Ongoing activity: Bagana (Papua New Guinea), Batu Tara (Indonesia), Dukono (Indonesia), Fuego (Guatemala), Karymsky (Russia), Kliuchevskoi (Russia), Shiveluch (Russia), Soufrière Hills (Montserrat), Turrialba (Costa Rica), Ulawun (Papua New Guinea).
Note: a.s.l. = ‘above sea level’.
Kilauea (Hawaii, USA). During 11-17 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, dropping small amounts of ash downwind. At Pu’u ‘O’o crater, a small incandescent vent on the N floor that occasionally extruded lava flows was observed to be a hornito. At the east rift zone, lava that flowed through the TEB lava-tube system fed occasional surface flows at the base of the pali and on the coastal plain WNW and W of Kalapana Gardens, as well as the Puhi-o-Kalaikini ocean entry. [GVP: Kilauea]
Manam (Papua New Guinea). RVO reported that incandescence from Manam’s South Crater was visible at 4-5 minute intervals on 10 August. The next day diffuse black ash plumes rose a few hundred meters above the rim. Steady incandescence was accompanied by periodic ejections of lava fragments ejected 400-500 m above the rim. Main Crater emitted diffuse white vapour. Based on analysis of satellite imagery, the Darwin VAAC reported that on 14 August ash plumes rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 55 km NW. [GVP: Manam]
San Miguel (El Salvador). On 13 August, Servicio Nacional de Estudios Territoriales (SNET) reported that seismicity remained above background levels after an increase was detected on 1 August. Average background RSAM values ranged from 15 to 50 units per day. During 12-13 August, RSAM values ranged between 433 and 465. Over the next few days, seismicity decreased significantly; from 14 August to 16 August, RSAM values decreased from 188 to 132. Access to areas within a 2-km-radius remained restricted. [GVP: San Miguel]
Bagana (Indonesia). Based on analyses of satellite imagery, the Darwin VAAC reported that during 13-15 August ash plumes from Bagana rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 75 km SW and W. [GVP: Bagana]
Batu Tara (Indonesia). Based on analyses of satellite imagery, the Darwin VAAC reported that during 13-17 August ash plumes from Batu Tara drifted 35-95 km NW and W at altitudes of 1.5-3 km (5,000-10,000 ft) a.s.l. [GVP: Batu Tara]
Dukono (Indonesia). Based on analyses of satellite imagery, the Darwin VAAC reported that during 12-17 August ash plumes from Dukono rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted 25-95 km W, NW, and SW. [GVP: Dukono]
Fuego (Guatemala). During 12-17 August, INSIVUMEH reported that explosions from Fuego produced ash plumes that rose to altitudes of 4.1-4.7 km (13,500-15,400 ft) a.s.l. and drifted W and NW. Rumbling and “degassing” sounds were associated with the explosions. At night during 15-16 August explosions ejected incandescent material 100 m above the crater. On 17 August blocks descended the S flanks. [GVP: Fuego]
Karymsky (Russia). KVERT reported that during 6-13 August seismic activity from Karymsky was above background levels and suggested that possible ash plumes rose to an altitude of 2.5 km (8,200 ft) a.s.l. A thermal anomaly over the volcano was detected in satellite imagery during 7-8 and 10-11 August. Based on analyses of satellite imagery and information from KVERT, the Tokyo VAAC reported an eruption on 16 August. A subsequent notice stated that ash had dissipated. The Aviation Colour Code level remained at Orange. [GVP: Karymsky]
Kliuchevskoi (Russia). KVERT reported that during 6-13 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 6 and 8-12 August. Cloud cover prevented observations the other days. Satellite imagery analysis showed a large and intense daily thermal anomaly on the volcano. Based on analyses of satellite imagery, the Tokyo VAAC reported a possible eruption on 16 August. A subsequent notice stated that ash had dissipated. The Aviation Colour Code level remained at Orange. [GVP: Kliuchevskoi]
Shiveluch (Russia). KVERT reported that during 6-13 August seismic activity from Shiveluch was above background levels, suggesting that possible ash plumes rose to an altitude of 6.5 km (21,300 ft) a.s.l. on 9 August and to an altitude of 4 km (13,100 ft) a.s.l. the other days. Cloud cover prevented visual observations. Satellite imagery analysis showed a daily thermal anomaly on the volcano and an ash plume that drifted 55 km NW on 10 August. The Aviation Colour Code level remained at Orange. [GVP: Shiveluch]
Soufrière Hills (Montserrat). MVO reported that mild ash-and-steam venting from Soufrière Hills as well as rockfalls were seen during 6-13 August. Most of the activity was focused in the collapse scar and above the Gages valley to the W. On 6 August a small ash plume rose 1 km above the lava dome, and on 8 August a pyroclastic flow descended Gages valley. The Hazard Level remained at 3. [GVP: Soufrière Hills]
Turrialba (Costa Rica). The Washington VAAC reported that on 15 August ash emissions from Turrialba were seen through an OVSICORI-UNA web camera, about 600 m E of the active crater. Satellite imagery showed an approximately 10-km-wide ash plume drifting 15 km W. [GVP: Turrialba]
Ulawun (Papua New Guinea). RVO reported that white and grey-to-brown plumes rose no more than 300 m above Ulawun during 6-12 August, and fine ash fell on the NW and W flanks. Seismicity decreased 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 11-17 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.