Sinabung volcano in northen Sumatra oday (Sun, 29 August, 2010) for the first time after probably several hundreds years. The volcano had not been monitored and the eruption came as a surprise.
A powerful explosion occured without warning at the Bocca Nuova summit crater of Etna volcano. The explosion was probably phreatic in origin and caused by a sudden release of gas and vapour trapped beneath a plug of collapse material that had been plugging the vents. Fortunately, no injuries were reported, but a similar event in 1971 killed several people who were caught by surprise by this type of explosion.
Based on information from JMA, the Tokyo VAAC reported explosions from Suwanose-jima on 25 and 27 August. Details of possible resulting plumes were not reported.
MVO reported that most of the rockfalls and pyroclastic flows detected during 20-27 August originated from a vertical face on the SE side of the lava dome and traveled W down Gages valley and E down the Tar River valley. The pyroclastic flows traveled no longer than 1.5 km and produced weakly convecting ash clouds that rose a few hundred meters. The Hazard Level remained at 3.
KVERT reported that during 20-27 August seismic activity from Shiveluch was above background levels, suggesting that possible ash plumes rose to an altitude of 8.5 km (27,900 ft) a.s.l. during 20-24 August. Gas-and-ash plumes were observed on 20 and 21 August.
The Washington VAAC reported that on 30 August an ash plume was observed near Sangay by a pilot. Ash was not seen in satellite imagery.
The Washington VAAC reported that on 30 August an ash plume was observed near Reventador by a pilot. Ash was not seen in satellite imagery.
According to the Washington VAAC, the Popayán Volcano Observatory (INGEOMINAS) received several reports from towns W of Nevado del Huila that indicated ash emissions on 30 August. Ash was not seen in satellite imagery, although extensive clouds were present in the area. A thermal anomaly was detected, however.
Wed, 25 Aug 2010, 06:00
KVERT reported that 20-27 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 on 20 and 21 August. Cloud cover prevented observations the other days.
Read allWed, 25 Aug 2010, 06:00
During 25-31 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 drifted SW.
Read allWed, 25 Aug 2010, 06:00
KVERT reported that during 20-27 August seismic activity from Karymsky was above background levels and suggested that possible ash plumes rose to an altitude of 3.8 km (12,500 ft) a.s.l. Satellite imagery showed a thermal anomaly over the volcano during 20 and 23-24 August. The Aviation Color Code level remained at Orange.
Read allWed, 25 Aug 2010, 06:00
Based on analyses of satellite imagery, the Darwin VAAC reported that during 25-29 August ash plumes from Dukono rose to altitudes of 2.1-3 km (7,000-10,000 ft) a.s.l. and drifted 35-110 km W and NE.
Read allWed, 25 Aug 2010, 06:00
AVO reported that on 26 August the Volcano Alert Level for Cleveland was raised to Advisory, and the Aviation Color Code was raised to Yellow, due to a persistent thermal anomaly near the summit visible in satellite imagery on most days during 16-24 August. Cloudy weather conditions prevented views of the summit during 25-29 August. A thermal anomaly was again seen in satellite imagery at night during 29-30 August.
Read allWed, 25 Aug 2010, 06:00
Based on analyses of satellite imagery, the Darwin VAAC reported that during 26-28 August ash plumes from Batu Tara rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted 55-75 km. The plumes drifted W and NW during 27-28 August.
Read allWed, 25 Aug 2010, 06:00
Based on information from JMA, the Tokyo VAAC reported that explosions from Sakura-jima during 26-31 August produced plumes that rose to altitudes of 1.2-2.1 km (4,000-7,000 ft) a.s.l. Some of the plumes drifted N and NW.
Read allWed, 25 Aug 2010, 06:00
CVGHM reported that on 28 August Sinabung emitted diffuse white plumes that rose 20 m and showed no signs of increased activity. On 29 August rumbling was heard, prompting authorities to contact and move people living within a 6-km-radius of the volcano. Later that day, an explosion produced an ash plume that rose 1.5 km above the crater, and the Alert Level was raised to 4 (on a scale of 1-4).
Read allWed, 25 Aug 2010, 06:00
RVO reported that during 13-26 August incandescence from Manam's South Crater was visible at night. Main Crater emitted diffuse white vapor. During 27-28 August incandescence emanated from both craters and brightened every 15-20 minutes.
Read allWed, 25 Aug 2010, 06:00
An eruption from Galeras that began at 0400 on 25 August prompted INGEOMINAS to raise the Alert Level to I (Red; "imminent eruption or in progress"). Meteorological cloud cover initially prevented visual observations of the summit. Seismicity associated with the eruption continued for a period of about 12 hours and gradually declined in the afternoon.
Read allWed, 25 Aug 2010, 06:00
SVERT reported that on 10 August scientists observed a vigorous steam plume from Ekarma that rose to an altitude of 1.8 km (5,900 ft) a.s.l. while visiting Sarychev Peak, 110 km SSW. On 24 August scientists visited Ekarma Island and observed continuous vigorous gas emissions from a new vent located on the S flank, about 250 m below the summit.
Read allWed, 18 Aug 2010, 06:00
RVO reported that white and gray-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.
Read allWed, 18 Aug 2010, 06:00
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.
Read allWed, 18 Aug 2010, 06:00
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.
Read allWed, 18 Aug 2010, 06:00
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.
Read allWed, 18 Aug 2010, 06:00
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.
Read allWed, 18 Aug 2010, 06:00
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.
Read allWed, 18 Aug 2010, 06:00
CENAPRED reported that on 23 August an ash plume from Popocatépetl rose 1 km above the crater.
Read allWed, 18 Aug 2010, 06:00
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.
Read allWed, 18 Aug 2010, 06:00
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.
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