Wed, 28 Nov 2007, 06:00
CENEPRED reported that multiple gas-and-steam plumes from Popocatépetl were observed during 28 November-4 December. On 1 December, high frequency seismic tremor was accompanied by an ash plume that rose to an altitude of 7.4 km (24,300 ft) a.s.l. and drifted N, and then NE.
Wed, 28 Nov 2007, 06:00The amplitude of volcanic tremor at Anatahan gradually increased through October and November and small explosions occurred during the last week of November. On 29 November, the Volcanic Alert Level was raised to Advisory and the Aviation Color Code was raised to Yellow based on the increase in seismicity.
Wed, 28 Nov 2007, 06:00
IG reported that although visual observations were occasionally limited due to cloud cover, ash-and-steam and ash plumes from Tungurahua rose to altitudes of 6-8 km (19,700-26,200 ft) a.s.l. during 27 November-4 December. During 28 November-1 December, seismic activity was elevated and multiple explosions were associated with almost continuous emissions of steam and ash.
Wed, 28 Nov 2007, 06:00Based on information from JMA, the Tokyo VAAC reported that eruption plumes from Suwanose-jima rose to altitudes of 1.2-1.8 km (4,000-6,000 ft) a.s.l. during 29 November-2 December and drifted E. Ash was not visible on satellite imagery.
Wed, 28 Nov 2007, 06:00
Data from deformation-monitoring instruments indicated that during 28 November-4 December lava-dome growth at Mount St. Helens continued. Small inflation-deflation events occurred which were interpreted as dome-growth pulses.
Wed, 28 Nov 2007, 06:00MVO reported that during 23 November-3 December the lava dome at Soufrière Hills changed very little, based on visual observations. Seismic activity was very low and low-level rockfall and pyroclastic flow activity continued. Fumarolic activity on the N and E flanks of the dome were observed.
Wed, 28 Nov 2007, 06:00
KVERT reported that seismic activity at Shiveluch was above background levels during 23-30 November. Based on seismic interpretation, ash plumes rose to an altitude of 6 km (19,700 ft) a.s.l. and hot avalanches occurred.
Wed, 28 Nov 2007, 06:00Based on overflights and web camera views, HVO reported that fissure segment D from Kilauea's 21 July fissure eruption continued to feed a lava channel and perched lava ponds that occasionally overflowed their edges during 28 November-3 December. Views were blocked by fumes on 4 December. The small lava pond at the top of the Thanksgiving Eve Breakout (TEB) shield, built directly over the fissure, occasionally overflowed and fed lava flows in multiple directions.
Wed, 28 Nov 2007, 06:00
CVGHM reported that on 29 November, the Alert level for Kelut was lowered from 3 to 2 (on a scale of 1-4), due to a decrease in seismicity and a lack of deformation. Observations of video footage from a camera on 25 November revealed that the lava dome was still active. Visitors and tourists were advised not to go within a 1.5-km radius of the crater lake.
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Wed, 28 Nov 2007, 06:00KVERT reported that seismic activity at Karymsky was at background levels during 24-25 November and slightly above background levels on 26 November. Seismic data was unavailable on the other days during 23-30 November. The Level of Concern Color Code remained at Orange.
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Wed, 28 Nov 2007, 06:00
Based on visual observations during clear weather, INGEOMINAS reported that steam-and-gas plumes from Galeras rose to a maximum altitude of 5.3 km (17,400 ft) a.s.l. during 21-23 November and 3 December. The plumes occasionally contained small volumes of ash and were associated with seismic tremor.
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Wed, 28 Nov 2007, 06:00Based on observations of satellite imagery, the Washington VAAC reported that an ash plume from Fuego drifted W on 29 November.
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Wed, 28 Nov 2007, 06:00
Based on reports from the Mexico City MWO, the Washington VAAC reported that an ash plume from Colima rose to an altitude of 7.3 km (24,000 ft) a.s.l. and drifted W on 26 November. Observations of satellite imagery showed a plume to the NNE.
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Wed, 28 Nov 2007, 06:00Based on reports from KVERT, the Washington VAAC reported an ash plume from Bezymianny at an altitude of 4.3 km (14,000 ft) a.s.l. on 2 December. Ash was not identified on satellite imagery. The level of Concern Color Code remained at Yellow.
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Sun, 18 Nov 2007, 10:37
Ubinas volcano continues to produce sporadic explosions with ash plumes rising to altitudes of about 5-7 km (16,000-23,000 ft) a.s.l.
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Sun, 18 Nov 2007, 10:28Tungurahua volcano continues its explosive eruptions producing ash plumes rising to altitudes of 6-9 km (19,700-30,000 ft) a.s.l. Ash ashfall was reported from multiple areas downwind, mainly to the W and SW. Loud roars and "cannon-shot" like detonations are heard in several areas near the volcano. IG reported the passing of a lahar on the SW flank that lasted about 30 minutes on 10 November.
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Sun, 18 Nov 2007, 10:23
Seismic activity at Shiveluch volcano remains at highly elevated levels. KVERT assumes that the volcano is producing exposions with ash plumes rising to altitudes of 8.5 km (28,000 ft) a.s.l. as well as small pyroclastic flows.
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Thu, 15 Nov 2007, 08:43Based on information from the Tanzania MVO, the Toulouse VAAC reported that Ol Doinyo Lengai erupted on 7 November and remained active. According to Frederick Belton's website, an observer saw a "smoke" plume rise to an altitude of 3.2-3.5 km (10,500-11,500 ft) a.s.l. and drift WSW towards the Gol Mountains on 10 November.
Thu, 15 Nov 2007, 08:33
Anak Krakatau continues its new strombolian activity from the new vent south of the summit crater. The eruptions are producing small ash plumes, ejections of incandescent spatter bombs as well as lava flows, as news reports and data from KRAKMON indicate. Seismicity was at elevated levels.
Thu, 15 Nov 2007, 08:29
KVERT reported a viscous lava flow erupted from the summit crater of Bezymianny volcano on 9 November. During an overflight on the same day, 4-km-long pyroclastic flow deposits from 5 November were observed on the SE flank. Lava flow-front collapses from older lava flows on the SE flank were also evident. A strong thermal anomaly is present on satellite data.
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Thu, 15 Nov 2007, 08:23
CVGHM lowered the Alert Status of Kelut on 8 November from 4 to 3 (on a scale of 1-4), due to a decrease in seismicity and deformation. Temperatures of the crater lake were measured at 75 deg C on 6 Nov, and 150-210 deg C on the surface of the new lava dome. According to a local news article, a volcanologist reported that the lava dome was 250 m in diameter and 120 m above the crater lake surface. On 11 November, a plume rose to an altitude of 3.7 km (12,000 ft) a.s.l. and ashfall was reported in several areas.
CVGHM recommended that evacuees could return to their homes, but should stay clear of the mountain within a 3-km radius was restricted.
Wed, 7 Nov 2007, 06:00Based on Significant Meteorological Information (SIGMET) advisories and observations of satellite imagery, the Buenos Aires VAAC reported that ash plumes from Ubinas rose to altitudes of 5.5-6.7 km (18,000-22,000 ft) a.s.l. during 11-12 November. Plumes drifted NNE.
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Wed, 7 Nov 2007, 06:00
Observers reported that on 5 November five active vents at Stromboli were visible at the bottom of the crater terrace, which subsided about 100 m since March 2007. Lava fountains from a vent in the SW crater were sustained for over one minute and spattering was observed from two vents in the central crater. The vents erupted about every five to ten minutes to one hour.
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Wed, 7 Nov 2007, 06:00Based on information from the Tanzania MVO, the Toulouse VAAC reported that Ol Doinyo Lengai erupted on 7 November and remained active. According to Frederick Belton's website, an observer saw a "smoke" plume rise to an altitude of 3.2-3.5 km (10,500-11,500 ft) a.s.l. and drift WSW towards the Gol Mountains on 10 November.
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Wed, 7 Nov 2007, 06:00
According to news articles, gas-and-ash plumes from Anak Krakatau continued rise and seismicity was elevated during 9-11 November. Incandescent material was propelled from the summit and fell onto the flanks. Lava flows were also observed traveling down the flanks.
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Wed, 7 Nov 2007, 06:00CVGHM reported that on 6 November, temperatures at the surface of Kelut's crater lake measured 75 degrees Celsius and the newly exposed lava dome surface measured 150-210 degrees Celsius. Plumes inhibited clear views of the lava dome. CVGHM lowered the Alert Status of Kelut on 8 November from 4 to 3 (on a scale of 1-4), due to a decrease in seismicity and stability indicated by deformation-monitoring instruments.
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Wed, 7 Nov 2007, 06:00
KVERT reported that possibly high-temperature gas-and-steam plumes from Bezymianny along with a thermal anomaly at the summit were visible on satellite imagery on 9 November. A viscous lava flow effused from the summit. During an overflight on the same day, 4-km-long pyroclastic flow deposits from 5 November were observed on the SE flank.
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Wed, 7 Nov 2007, 06:00IG reported that although visual observations were limited due to cloud cover, ash-and-steam and ash plumes from Tungurahua rose to altitudes of 6-9 km (19,700-30,000 ft) a.s.l. during 7-13 November. Plumes mainly drifted W and SW and ashfall was reported from multiple areas downwind, including areas to the N and NW.
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