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Aerialphoto of the summit of Fourpeaked volcano on an overflight on the 24th of Sep 2006 showing several steaming vents on its summit. (Photo courtesy: Cyrus Read, AVO/USGS)
The first known historic eruption of Fourpeaked volcano on the Alaska peninsula is taking its course. Several vents emitting gasses and ash have appeared on the glacier-topped volcano and are slowly melting the ice cap.
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Augustine volcano seen from the air on 4 January, 2006 (photo courtesy: G. McGimsey, USGS-AVO)
Augustine volcano, Alaska, is showing more and more unrest and the Alaskan Volcan Observatory announced an increase of alert level to ORANGE, which means that an eruption is considered possible within a short time.
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AP press photo (provided by Louis and Kathleen Nevzoroff via USGS) of Korovin eruption on 23 Feb., 2005.
On repeated visits by the Volcano Discovery Hawaii Team during the past 10 days, activity levels at Kilauea volcano were seen to be at very high levels:
The eruption at Piton de la Fournaise volcano on La Réunion island continues, sending lava flows down the steep flank of the volcano's E flank towards the sea. A brief pause during the eruption occurred between 21 and 23 Feb., where lava emission and eruption tremor were at very low levels, and many believed the eruption was actually over. The following is a report from Thomas Staudacher, head of the volcano observaotry of Piton de la Fournaise:
Seismic activity decreased substantially at Veniaminof during 18-25 February in comparison to previous weeks, leading AVO to decrease the Concern Color Code from Orange to Yellow. Periods of volcanic tremor diminished, and no discrete events associated with ash bursts had occurred for several days. Only minor steam emissions were seen.
Based on interpretations of seismic data, a large eruption occurred at Shiveluch from 1825 on 27 February to 0100 on 28 February, leading KVERT to raise the Concern Color Code from Orange to Red (the highest level). Meteorological clouds obscured the volcano during the eruption. A large thermal anomaly visible near the lava dome on satellite imagery at 0456 on 28 February was probably the signal from a large pyroclastic flow on the volcano's SW flank.
Wed, 23 Feb 2005, 06:00
On 24 February AVO raised the Concern Color Code at Korovin volcano from Green to Yellow after receiving a report that ash and steam were emitted from Korovin on 23 February around 1900. According to residents of Atka village near the volcano, the initial ash burst rose to a height of ~ 2.4 km a.s.l. and drifted E.
Read allWed, 23 Feb 2005, 06:00
Volcanic and seismic activity were at relatively low levels at Tungurahua during 23-28 February. Low-energy gas, steam, and ash plumes were emitted. In addition, long-period earthquakes and episodes of tremor were recorded.
Read allWed, 23 Feb 2005, 06:00
During 23 February to 1 March, growth of the new lava dome inside the crater of St. Helens continued, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. Seismic data indicated that parts of the growing lava dome continued to crumble, forming rockfalls and generating small ash clouds that drifted out of the crater.
Read allWed, 23 Feb 2005, 06:00
According to a news article, residents of the island of St.Vincent reported smelling sulfur in towns as far S as Kingstown. This sparked fears among the population that volcanic activity had increased at Soufriere St. Vincent.
Read allWed, 23 Feb 2005, 06:00
RVO reported that Rabaul caldera's active vent at Tavurvur cone continued to erupt during 22-24 February. Ash clouds rose several hundred meters before drifting SE. Most ash fell offshore, but there were reports of fine ash reaching Tokua airport, ~45 km SW of Rabual Town.
Read allWed, 23 Feb 2005, 06:00
Contrary to reports that volcanic activity had ceased at Piton de la Fournaise on 19 February, the eruption continued through at least 25 February. After a period of low activity around the 19th, eruption tremor increased to high levels again on 21 February. Two eruption sites were active: the principal vent at 1,600-m elevation above the Plaine des Osmondes, and a vent at about 1,200-m elevation in the Plaine des Osmondes.
Read allWed, 23 Feb 2005, 06:00
The summit of Manam was obscured by clouds during 22-24 February, impeding observations. Seismicity was low, with small low-frequency earthquakes and without volcanic tremor. The Alert Level at Manam remained at 2.
Read allWed, 23 Feb 2005, 06:00
During 23-26 February, lava from Kilauea entered the sea at three ocean entries that were located along 4.7 km of the island's SE coast. Lava may have stopped flowing into the sea at the westernmost entry, West Highcastle, on the 26th. The number of surface lava flows diminished in comparison to the previous week.
Read allWed, 23 Feb 2005, 06:00
Lava avalanches continued at Karangetang during 25-27 February, traveling 500-1,200 m down the drainages of Kali Beha, Kali Kahetang, Kali Batuawan, and Kali Nanitu. Seismicity was dominated by avalanche earthquakes. Karangetang remained at Alert Level 3 (on a scale of 1-4).
Read allWed, 23 Feb 2005, 06:00
During 25-27 February, ash plumes from Egon rose to low levels above the volcano and seismicity was dominated by shallow volcanic earthquakes. Egon remained at Alert Level 4, the highest hazard status.
Read allWed, 23 Feb 2005, 06:00
During 23-28 February, several small explosions at Colima produced ash plumes that rose to low levels; plumes drifted predominately W.
Read allWed, 23 Feb 2005, 06:00
Seismic and acoustic records from Anatahan during 17-28 February showed that a very low level of activity continued at the volcano. Amplitudes recorded during 23-28 February were near levels recorded prior to the onset of the 5 January eruption. NASA MODIS (Moderate Resolution Imaging Spectroradiometer) imagery taken on 28 February showed a faint plume of vog (fog composed of volcanic gas) and steam trending W of Anatahan.
Read allFri, 18 Feb 2005, 10:44
Piton de la Fournaise has its first eruption in 2005. This is from a report sent to the volcano listserv by Thomas Staudacher (Observatoire volcanologique du Piton de la Fournaise):
Read allWed, 16 Feb 2005, 06:00
During 11-18 February, it was likely that low-level Strombolian eruptive activity continued at Veniaminof based on seismic data and satellite imagery. Cloudy conditions obscured web camera views of the volcano, and no ash emissions were observed above the cloud cover. Seismicity remained above background levels at Veniaminof.
Read allWed, 16 Feb 2005, 06:00
Volcanic and seismic activity were at low levels at Tungurahua during 16-22 February. Low-energy gas, steam, and ash plumes were emitted. In addition, long-period earthquakes and episodes of tremor were recorded.
Read allWed, 16 Feb 2005, 06:00
During 16-22 February, growth of the new lava dome inside the crater of St. Helens continued, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. A GPS unit deployed on 16 February on the E arm of the glacier within the volcano's crater moved northward about 1.2 m per day.
Read allWed, 16 Feb 2005, 06:00
Seismicity was above background levels at Shiveluch during 11-18 February, with weak shallow earthquakes occurring beneath the active lava dome. Ash plumes may have risen to a maximum height of 7.4 km a.s.l. on 17 February.
Read allWed, 16 Feb 2005, 06:00
During 1-21 February, eruptions of ash clouds occurred fairly frequently at Rabaul caldera's Tavurvur cone. Ash clouds rose a few hundred meters, drifted SE, and deposited ash mainly offshore. Incandescent lava fragments were visible during several evenings.
Read allWed, 16 Feb 2005, 06:00
A new period of heightened seismic activity began at Piton de la Fournaise on 17 February around 1300, consisting of about 100 seismic events within 90 minutes. After that, the number of events decreased, but recommenced at 1638 with several hundreds of events. Strong deformation was recorded at the same time by tiltmeters and the extensometer network.
Read allWed, 16 Feb 2005, 06:00
According to RVO, mild eruptive activity was observed from Manam's Southern Crater during 18-21 February. Weak-to-moderate ash explosions the crater emitted rose a few hundred meters above the crater and drifted E and SE, depositing fine ash in areas downwind. Main Crater emitted white vapor.
Read all
