Wed, 30 Apr 2008, 06:00
SERNAGEOMIN reported that Chaitén erupted on 2 May, following increased seismicity in the region the day before. A pulsating white to gray ash plume rose to an estimated altitude greater than 21 km (68,900 ft) a.s.l. and drifted SSE.
Wed, 30 Apr 2008, 06:00Based on information from RVO, the Darwin VAAC reported that Balbi erupted on 7 May. Ash was not detected on satellite imagery. [Correction: RVO later confirmed that Balbi did not erupt on 7 May and attributed the reports to thunderstorm activity.]
Wed, 30 Apr 2008, 06:00
The IG reported that although visual observations were occasionally limited due to cloud cover during 29 April-6 May, ash-and-steam plumes from Tungurahua were spotted and generally rose to altitudes of 5.5-7 km (18,000-23,000 ft) a.s.l. Ashfall was reported in areas to the SW and W during 29 April-1 May and on 4 May. On 30 April, explosions produced steam-and-ash plumes to altitudes of 9-10 km (29,500-32,800 ft) a.s.l.
Wed, 30 Apr 2008, 06:00MVO reported that during 25 April-2 May the level of volcano-tectonic earthquakes at Soufrière Hills increased and was the highest since February 2006. Degassing from a vent above Gages Wall was audible in the St. George's Hill area to the NW.
Wed, 30 Apr 2008, 06:00
KVERT reported that seismic activity at Shiveluch was at background levels during 25 April-2 May. Observations of satellite imagery revealed that a thermal anomaly was present in the crater during 27, 28, and 30 April, and 1 May. On 28 April, ash deposits extending about 10 km NW were observed on satellite imagery and possible gas-and-ash explosions were detected by the seismic network.
Wed, 30 Apr 2008, 06:00RVO reported that during 30 April-7 May ash plumes from multiple places inside Rabaul caldera's Tavurvur cone rose to altitudes of 1.2-2.2 km (3,900-7,200 ft) a.s.l. and drifted N, E, and SE. Intermittent roaring and rumbling noises and occasional explosions were reported.
Wed, 30 Apr 2008, 06:00
INGEOMINAS reported that no significant morphological changes to the summit of Nevado del Huila were noted during an overflight on 6 May, although the NE and NW flanks could not be directly observed. Fumarolic plumes drifted NW. The Alert Level was lowered to Yellow (on a 4-color scale where Yellow is the second lowest).
Wed, 30 Apr 2008, 06:00Based on visual observations from HVO and National Park Service (NPS) crews and web camera views, HVO reported that during 30 April-6 May lava flowed SE through a lava tube system underneath Kilauea's Thanksgiving Eve Breakout (TEB) and rootless shield complex to the Waikupanaha ocean entry. On 4 May, lava flows from breakouts on the pali reached the coastal plain. Kilauea summit earthquakes were located beneath the Halema'uma'u crater, along the S-flank faults, and along the SW and E rift zones.
Wed, 30 Apr 2008, 06:00
KVERT reported that seismic activity at Karymsky was at background levels during 25 April-2 May. Possible activity was characterized by gas-and-ash plumes that rose to altitudes of 2-2.5 km (6,600-8,200 ft) a.s.l. Based on seismic interpretation, a gas-and-ash explosion may have occurred on 26 April.
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Wed, 30 Apr 2008, 06:00Based on observations of satellite imagery, the Darwin VAAC reported that low-level plumes from Batu Tara rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted NW on 3 and 7 May.
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Wed, 30 Apr 2008, 06:00
Based on information from JMA and observations of satellite imagery, the Tokyo VAAC reported that during 6-7 May eruption plumes from Sakura-jima rose to altitudes of 2.4-3.4 km (8,000-11,000 ft) a.s.l. The plumes drifted S.
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Thu, 24 Apr 2008, 22:20As observed during our recent
tour to Etna and the Eolian Islands, mild strombolian activity, with small exploisions every 10-20 minutes, is present at the vent located at the lower E flank of the SE crater of Etna.
Thu, 24 Apr 2008, 22:17
Based on pilot observations, the Darwin VAAC reported that a plume from Semeru rose vertically to an altitude of 6.1 km (20,000 ft) a.s.l. on 21 April.
Thu, 24 Apr 2008, 09:46Anak Krakatau is getting active again. CVGHM reported increased seismicity during 14-21 April as well as ash plumes accompanied by ejections of incandescent rocks observed during field observations on 16, 17, and 18 April. The renewed eruption affected the summit and the E and S flanks. Booming noises were reported and occasionally heard at an observation post 42 km away. The Alert Level was raised to 3 (on a scale of 1-4) on 21 April.
Wed, 23 Apr 2008, 06:00
Based on SIGMET reports and observations of satellite imagery, the Buenos Aires VAAC reported that an ash plume from Ubinas rose to altitudes of 5.5-9.1 km (18,000-30,000 ft) a.s.l. and drifted SE and S on 23 April.
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Wed, 23 Apr 2008, 06:00Based on observations of satellite imagery and pilot observations, the Washington VAAC reported that an ash plume from Masaya rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted SW on 29 April.
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Wed, 23 Apr 2008, 06:00
The IG reported that although visual observations were occasionally limited due to cloud cover during 22-28 April, ash-and-steam plumes from Tungurahua were spotted and rose to altitudes of 6-8 km (19,700-26,200 ft) a.s.l. Ashfall was reported in areas downwind on 23, 25, and 28 April. On 22 April, a small lahar descended the Mapayacu drainage to the SW.
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Wed, 23 Apr 2008, 06:00KVERT reported that seismic activity at Shiveluch was above background levels during 18-25 April. Observations of satellite imagery revealed that a thermal anomaly was present in the crater during 18 and 20-23 April. According to video footage and visual observations, fumarolic activity from the lava dome occurred during 21-23 April.
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Wed, 23 Apr 2008, 06:00
Based on observations of satellite imagery, the Washington VAAC reported that an ash plume from Santa María's Santiaguito lava dome complex rose to an altitude of 4.6 km (15,000 ft) a.s.l. and drifted SW on 25 April. On 28 April, INSIVUMEH reported that weak explosions produced ash plumes that rose to an altitude of 4.1 km (13,500 ft) a.s.l. and drifted W.
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Wed, 23 Apr 2008, 06:00RVO reported that during 23-29 April ash and ash plumes from Rabaul caldera's Tavurvur cone rose to altitudes of 1.7-2.7 km (5,600-8,900 ft) a.s.l. and drifted N, NE, E, SE, and SW. Incandescence at night at the summit, intermittent roaring noises, and occasional explosions were reported.
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Wed, 23 Apr 2008, 06:00
INGEOMINAS reported that seismicity from Nevado del Huila decreased during 23-29 April. No significant morphological changes to the summit were noted during an overflight on 29 April, although the NE and NW flanks could not be seen due to strong winds. The Alert Level remains at Orange (on a 4-color scale where Orange is second highest).
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Wed, 23 Apr 2008, 06:00Based on observations of satellite imagery and information from RVO, the Darwin VAAC reported that a diffuse plume from Manam rose to an altitude of below 3 km (10,000 ft) a.s.l. and drifted NW.
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Wed, 23 Apr 2008, 06:00
SERNAGEOMIN reported that on 24 April, seismicity from Llaima increased and gas-and-ash plumes associated with explosions rose to an altitude of 4.6 km (15,100 ft) a.s.l. No morphological changes to the summit were observed during an overflight on 25 April, except for a small increase of the diameter of the SE crater. Bluish gas was emitted from the main crater.
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Wed, 23 Apr 2008, 06:00Based on observations during helicopter overflights, visual observations from HVO and National Park Service (NPS) crews, and web camera views, HVO reported that during 23-29 April lava flowed SE through a lava tube system underneath Kilauea's Thanksgiving Eve Breakout (TEB) and rootless shield complex to the Waikupanaha ocean entry. Incandescence from breakouts along the lava-tube system was noted on 23 April.
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Wed, 23 Apr 2008, 06:00
KVERT reported that seismic activity at Karymsky was above background levels during 18-25 April. Observations of satellite imagery revealed that a thermal anomaly was present in the crater on 18 and 21 April. Based on seismic interpretation, weak ash-and-gas explosions may have occurred on 20 and 21 April and produced plumes to altitudes of 2.6-3.4 km (8,500-11,200 ft) a.s.l.
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Wed, 23 Apr 2008, 06:00According to news articles, PHIVOLCS lowered the Alert Level for Kanlaon to 0 on 25 April. Seismic activity was at background levels during 5 March-25 April, with 0-3 earthquakes per day. Mt.
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Wed, 23 Apr 2008, 06:00
The Washington VAAC reported that an ash plume from Fuego was visible on satellite imagery on 23 April and drifted SW. On 28 April, INSIVUMEH reported that explosions (1 per hour) produced ash plumes to an altitude of 4.4 km (14,400 ft) a.s.l. The plumes drifted 5 km SW.
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Wed, 23 Apr 2008, 06:00The Darwin VAAC reported that low-level ash-and-steam plumes from Batu Tara were observed on satellite imagery during 25-26 April.
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