Liste archivée des actualités:
vendredi, août 31, 2007
Tungurahua volcano (Ecuador), activity update: moderate explosive activity continues, lahars & mudflows
Moderately strong explosions continue at Tungurahua volcano. ...plus
Data from deformation-monitoring instruments indicated that during 22-28 August lava-dome growth at Mount St. Helens continued. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. Clouds occasionally inhibited visual observations.
MVO reported that during 21-28 August the lava dome at Soufrière Hills changed very little, based on visual observations. Seismic activity was very low and low-level rockfall activity continued. On 23 August, heavy rainfall triggered small rockfalls and four pyroclastic flows to the E down the Tar River Valley. Ash and steam emissions from the dome produced a plume that drifted W. A lahar occurred in the Belham river valley to the NW. The Alert Level remained elevated at 4 (on a scale of 0-5).
KVERT reported that seismic activity at Shiveluch was above background levels during 17-24 August. Based on seismic interpretation, avalanches and ash plumes that rose to an altitude of 8.5 km (27,900 ft) a.s.l. occurred during the reporting period. Based on visual observation, ash plumes rose to an altitude of 5.5 km (18,000 ft) a.s.l. and drifted N and NE during 17-21 August. Incandescence at the lava dome and incandescent avalanches were seen at night on 21 August. Observations of satellite imagery revealed that a thermal anomaly was present in the crater during 17-24 August. The Level of Concern Color Code remained at Orange
RVO reported that ash plumes from Rabaul caldera's Tavurvur cone rose to altitudes of 0.9-2.4 km (3,000-7,900 ft) a.s.l. during 22-29 August and drifted NW. Ashfall was reported in Rabaul Town and surrounding areas during 23-29 August. Seismic activity increased to a high level on 25 through 29 August. The ash emissions were accompanied by roaring noises. Incandescence at the summit was observed during the reporting period. ...plus
HVO reported that fissure segment D from Kilauea's 21 July fissure eruption continued to feed an advancing 'a'a lava flow during 22-28 ...plus
Seismic activity at Karymsky was above background levels during 17-24 August, with 300-800 shallow earthquakes occurring daily. Based on seismic interpretation, ash plumes may have risen to an altitude of 5.7 km (18,700 ft) a.s.l. Observations of satellite imagery revealed that a thermal anomaly was present in the crater on 20 and 23 August. The Level of Concern Color Code remained at Orange. ...plus
On 24 August, INSIVUMEH reported that fumarolic plumes from Fuego rose to an altitude of 3.9 km (12,800 ft) a.s.l. and drifted W. A lahar carried tree trunks, branches, and blocks down the Lajas drainage to the SE. A lahar again affected the drainage on 27 August. Explosions on 28 August produced ash plumes that rose to an altitude of 4.1 km (13,500 ft) a.s.l.
Clouds obscured satellite and web camera views of Cleveland volcano during 22-28 August. A clear view of the crater on 23 and 28 August revealed thermal anomalies at the summit. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.
Based on observations of satellite imagery, the Darwin VAAC reported that an ash plume from Raung rose to an altitude of 4.6 km (15,000 ft) a.s.l. during 26-27 August and drifted E.
Seismic activity at Pavlof remained elevated during 22-28 August. A strong thermal anomaly was present at the summit on satellite imagery on 22, 24, 25, and 28 August; clouds inhibited observations on other ...plus
jeudi, août 30, 2007
News about an eruption on Ferdinandina Island in the Galapagos archipelago turned out to be wrong. After an earthquake with a 5.2-degree Richter Scale on Tuesday, ash plumes were believed to have originated from a new eruption. As an overflight revieled, the ash plume had been caused by a large rockfall from the inner rim of the caldera and not by an eruption.
jeudi, janv. 01, 1970
Etna est retour en éruption. Depuis le 15 août 2007, le cratère se montre faible activité explosive de la cheminée dans la fosse d'effondrement sur la falnk e du cône SE. L'activité concerne principalement des explosions de profondes strombolienne se produisant à des intervalles irréguliers de plusieurs minutes ou plus, produisant foncé pour les panaches de cendres brune avec certains matériel frais.
jeudi, août 23, 2007
Karymsky continues erupting producing sporadic ash plumes. An explosion on 22 Aug produced an ash plume rising to 6 km altitude according to the Tokyo VAAC.
Explosive activity at Sheveluch volcano continues. Ash plumes from explosions rising to 4-6 km are observed by pilots and from satellite. According to Ria Novosti, a possibly much more powerful eruption might have taken place last Tuesday (21 Aug), sending ash to more than 10 km, although it has not been confirmed so far by other data.
A large sulfur dioxide plume and several thermal anomalies from Manda Hararo were detected in satellite imagery on 13 August. On 16 August, a field team conducted aerial and ground observations of a locality known as Karbahi, a graben area with numerous active faults, fissures, and basalt flows, NW of the center of Manda Hararo. Observations revealed active volcanism, including isolated areas of intense gas emission and visible sulfur deposits. Basaltic lava flowed from long fissures, predominantly to the W of the graben floor. Each fissure was covered by a continuous row of small and closely spaced spatter and scoria cones 2-10 m high. Spatter and scoria deposits ranged in size from coarse lapilli to bombs. Incandescence and occasionally small flames were emitted from the tops of some of the cones. ...plus [lire toutes]
mercredi, août 22, 2007
The new fissure eruption in the Danakil near Erta Ale earlier this month, on 14-15 August, is reported to have killed five people, hundreds of camels and and drove more than 2 000 people from their homes. According to Ethiopian news sources, the "eruption also opened a 10km crack in the ground and spewed lava 300m in the air." ...plus
The fissure eruption episode which started on 21 July continues to feed a lava flow that is now branching out to the north more than advancing to the northeast. ...plus [lire toutes]
Pavlov continues to emit a viscous lava flow shedding avalanches of incandescent blocks. Explosive activity is minimal.
lundi, août 20, 2007
Soputan volcano remains active, producing small to medium ash explosions at irregular intervals. Observed ash plumes reach a maximum of 3-5 km height.
After a gradual increase in activity, Karangetang volcano on Siau island started a more violent phase of activity. Lava flows and pyroclastic flows from the growing lava dome have been reported. ...plus
samedi, août 18, 2007
After 11 years of quietness, the most active of Alaska's volcanoes, Pavlov, has begun erupting again. ...plus [lire toutes]
jeudi, août 16, 2007
The Ethiopian News Agency report a possible new flank eruption from Erta Ale volcano in the Danakil desert. Ethiopian News Agency. According to the agency, two people are reported missing and several hundreds of villagers were forced to flee from their area by a lava flow. ...plus [lire toutes]
vendredi, août 10, 2007
Fuego volcano is in a particularly active phase. We received a report from Suzanne De Berge who witnessed its eruption: ...plus [lire toutes]
Volcanic unrest at Turrialba volcano continues. Signs of an ongoing slow intrusion of magma at shallow depths indicating a possible eruption in the near-medium term future increase. ...plus [lire toutes]
jeudi, janv. 01, 1970
Comme notre collègue Andrea rapports Ercolani de Stromboli, l'accès à la zone du sommet du Stromboli a été rouvert pour des visites guidées sous certaines restrictions. En bref, les petits groupes accompagnés de guides autorisés peuvent désormais atteindre la crête à l'est de la terrasse de cratère entre 750 et environ 850 m d'altitude, où quelques abris sont situés, mais le séjour maximum est maintenant limitée à 30 minutes. L'accès au sommet du Pizzo lui-même est limitée au temps nécessaire pour passer le long du sentier.
lundi, août 06, 2007
Based on pilot observations, the Washington VAAC reported that an ash plume from Sangay rose to an altitude of 6.7-8.2 km (22,000 to 27,000 ft) a.s.l. on 28 July. Ash was not detected on satellite imagery but a weak hotspot could be seen.
Based on a pilot report, the Darwin VAAC reported that an ash plume possibly from Raung rose to an altitude of 1.5 km (5,000 ft) a.s.l. Ash was not visible on satellite imagery.
dimanche, août 05, 2007
CVGHM lowered the Alert Level for Gamkonora from 3 to 2 (on a scale of 1-4) on 24 July based on visual observations and a decrease in seismicity. That followed a sharp drop in seismicity during 8-23 July, a decline both in terms of the number of events and their energy. Later, during 16-23 July, when breaks in inclement weather took place, observers saw white plumes rising to altitudes of 5.6 km (18,400 ft) a.s.l. Available CVGHM reports issued through the 26th did not disclose more recent events.
A thermal anomaly in the crater of Cleveland was visible on satellite imagery during 25-26 July. ...plus
jeudi, août 02, 2007
A possible small ash eruption took place at Raung on 26 July. A pilot report a small ash plume 5,000 ft (ca. 1.5 km) above the summit of the volcano. Ash was not visible on satellite imagery.
Kilauea volcano (Hawai'i), activity update: eruptive fissure east of Pu'u 'O'o continues to feed lava flows
Parts of the eruptive fissure that opened up east of Pu'u 'O'o on 21 July are still active, feeding spreading 'a'a and pahoehoe lava flows and small lava ponds in the area. No lava has been seen at Pu'u 'O'o itself, which shoows deflation (likely related to draining of lava from the plumbing system).
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