INGEOMINAS reported that on 29 April an eruption from Galeras was detected by the seismic network. Observers to the N and NW reported that an ash plume drifted NW; ash fell in areas up to 35 km downwind. During 4-5 May, ash plumes drifted NE and ashfall was reported in multiple areas of Pasto (about 10 km E).
CVGHM reported that the number of eruptions from Anak Krakatau increased significantly at the end of March and continued through 5 May. Seismic data were not collected during 26 April-29 April due to instrument malfunctions. Direct observations of the crater on 24, 25, and 29 April revealed that the eruption originated from a crater on the W slope of Anak Krakatau.
Based on analysis of satellite imagery, the Washington VAAC reported that on 1 May a thermal anomaly over Reventador was noted along with a possible low-level plume drifting W. The IG reported to the VAAC lava and gas emissions, and possible smoke from burning vegetation, but little to no ash.
CVGHM reported than during 29 April-2 May seismicity from Rinjani increased and tremor was detected. On 2 May, an eruption produced dense brown "smoke" that rose 1 km from Barujari cone and was accompanied by a booming noise. On 4 May, an eruption of ash produced a white to brown plume that rose 500-700 m above the cone and drifted N.
KVERT reported that seismic activity at Shiveluch was above background levels during 28 April-1 May. Based on interpretations of seismic data, ash plumes likely rose to altitudes of 5-6 km (16,400-19,700 ft) a.s.l. During 29-30 April, observers reported active fumaroles.
During 23 April-5 May, CVGHM reported that seismicity from Slamet increased and an eruption originating from the western part of the crater continued. During times of clear weather, observers reported that incandescent lava, ejected 25-100 m above the crater, fell back into and around the active crater. Gray and white "smoke" rose 100-800 m from the crater.
Based on information from JMA, the Tokyo VAAC reported that during 3-4 May eruptions from Sakura-jima produced plumes that rose to altitudes of 2.4-3.7 km (8,000-12,000 ft) a.s.l.
Based on information from JMA, the Tokyo VAAC reported that on 30 April and 2 May eruptions from Asama produced plumes that rose to altitudes of 3-3.4 km (10,000-11,000 ft) a.s.l. and drifted NE.
Wed, 29 Apr 2009, 06:00
Based on analysis of satellite imagery, the Darwin VAAC reported that during 29-30 April and 3-4 May ash plumes from Batu Tara rose to altitudes of 2.4-3 km (8,000-10,000 ft) a.s.l. and drifted 45-185 km NW and W.
Read allWed, 29 Apr 2009, 06:00
Based on web camera views and analysis of satellite imagery, the Buenos Aires VAAC reported that on 29 April an ash plume from Chaitén's Domo Nuevo 1 and Domo Nuevo 2 lava-dome complex rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted NW.
Read allWed, 29 Apr 2009, 06:00
On 1 May, AVO decreased the Aviation Color Code and the Volcano Alert Level for Cleveland to "Unassigned" because no volcanic activity had been detected since late January. Cleveland is not monitored by a real-time seismic network, thus the levels "Green" or "Normal" do not apply because background activity is not defined.
Read allWed, 29 Apr 2009, 06:00
Based on analysis of satellite imagery and pilot observations, the Darwin VAAC reported that during 29 April-4 May ash plumes from Dukono rose to an altitude of 3.7-4.5 km (12,000-14,000 ft) a.s.l. and drifted 45-165 km E and NE.
Read allWed, 29 Apr 2009, 06:00
KVERT reported that during 24 April-1 May observers from Severo-Kurilsk, about 7 km E of Ebeko, observed continued activity. Gas-and-steam plumes with some ash content rose to an altitude of 3.5 km (11,500 ft) a.s.l. and drifted 6 km in multiple directions.
Read allWed, 29 Apr 2009, 06:00
Based on analysis of satellite imagery, KVERT reported that a weak thermal anomaly over Karymsky was noted on 26 April. The Level of Concern Color Code was lowered to Yellow.
Read allWed, 29 Apr 2009, 06:00
During 29 April-5 May, HVO reported that lava flowed SE from underneath Kilauea's Thanksgiving Eve Breakout (TEB) and rootless shield complex through a lava tube system, reaching the Waikupanaha and Kupapa'u ocean entries. Some explosions occurred at the Waikupanaha ocean entry. The vent in Halema'uma'u crater continued to produce a white plume that sometimes caused poor air quality in nearby areas.
Read allWed, 29 Apr 2009, 06:00
CENAPRED reported that emissions of steam and gas from Popocatépetl were visible during 29 April-5 May; the plumes contained slight amounts of ash on 29 April.
Read allWed, 29 Apr 2009, 06:00
RVO reported that on 27 April white and occasionally gray plumes from Rabaul caldera's Tavurvur cone rose 0.5-1 km above the crater. Ashfall was reported in Kokopo, about 20 km SE, along with infrequent roaring noises. Activity decreased during 28 April-2 May; white and, less frequently blue, plumes were emitted.
Read allWed, 29 Apr 2009, 06:00
During 29 April-5 May, AVO reported that elevated seismicity from Redoubt and a persistent thermal anomaly over the summit lava dome detected on satellite imagery were consistent with continued lava-dome growth. Changes in the size and shape of the dome confirmed growth; the volume of the dome was an estimated 25-30 million cubic meters. Occasional small rock avalanches originating from the N side of the lava dome produced minor low-level ash emissions.
Read allWed, 29 Apr 2009, 06:00
Based on information from JMA, the Tokyo VAAC reported that eruptions from Suwanose-jima during 29 April-1 May produced plumes that rose to altitudes of 1.5-1.8 km (5,000-6,000 ft) a.s.l. Plumes drifted W on 30 April and 1 May.
Read allWed, 29 Apr 2009, 06:00
During 28 April-5 May, IG reported that, although inclement weather often prevented observations of Tungurahua, steam-and-gas plumes were seen almost daily. The plumes rose to altitudes below 6.8 km (22,300 ft) a.s.l. and drifted SW and W.
Read allMon, 27 Apr 2009, 15:44
A new eruption at Slamet volcano started around 24 April, 2009, last week. Observers report strombolian explosions and ash clouds rising several hundreds of meters from the summit crater.
Read allWed, 22 Apr 2009, 06:00
Based on analysis of satellite imagery, the Darwin VAAC reported that on 26 April an ash plume from Bagana rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 28 km S.
Read allWed, 22 Apr 2009, 06:00
KVERT reported that during 17-24 April observers from Severo-Kurilsk, about 7 km E of Ebeko, observed continued activity. Gas-and-steam plumes with some ash content rose to an altitude of 2 km (6,600 ft) a.s.l. during 17-19 April and drifted 8 km NE.
Read allWed, 22 Apr 2009, 06:00
INGEOMINAS reported that on 24 April seismicity from Galeras was similar to that seen prior to previous eruptions. Video camera views of the crater showed decreased gas emissions. The Alert Level was raised to II (Orange; "probable eruption in term of days or weeks").
Read allWed, 22 Apr 2009, 06:00
The USGS stated that a crew from a NOAA ship working at Pagan observed continuous steam emissions from the N crater during 21-22 April. Satellite imagery analyzed by the Washington VAAC showed a diffuse plume drifting 15 km W on 23 April. On 28 April, steam emissions had decreased so the Aviation Color Code and the Volcano Alert Level were lowered to "Unassigned." There are no monitoring instruments on Pagan, thus the levels "Green" or "Normal" do not apply because background activity is not defined.
Read allWed, 22 Apr 2009, 06:00
The IG reported that seismicity from Reventador decreased to low levels on 26 March, after the seismic network had detected an earthquake swarm the same day. On 23 April, increased seismicity was characterized by long-period events interspersed with bands of spasmodic and harmonic tremor. Observers reported that steam plumes with low ash content rose to altitudes of 5.6-6.6 km (18,400-21,700 ft) a.s.l. and drifted W.
Read allWed, 22 Apr 2009, 06:00
KVERT reported that seismic activity at Shiveluch was above background levels during 17-24 April. Based on interpretations of seismic data, ash plumes likely rose to altitudes of 4.5-5.3 km (14,800-17,400 ft) a.s.l. Analysis of satellite imagery revealed a daily thermal anomaly on the lava dome.
Read allWed, 22 Apr 2009, 06:00
CVGHM reported that seismicity from Slamet increased during 19-23 April. Diffuse white plumes rose about 50 m above the crater on 20 April. During 21-23 April, white and white-to-brownish plumes rose 50-800 m above the crater.
Read all
