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Liste archivée des actualités:jeudi, sept. 27, 2007
Pilots reported ash plumes that rose to an altitude of of 5.5-6.4 km on 12 and 20 September.
IG reported that ash and steam-and-ash plumes from Tungurahua rose to
altitudes of 5.3-7 km during 19-20 and 22-24 September.
From 19-25 September lava-dome growth at Mount St. Helens continued.
Montserrat Volcano Observatory reported that during 19-25 September the lava dome at Soufrière Hills changed only very little. Seismic activity was very low and low-level rockfall activity continued.
A pilot reported a ash plume that rose up to 7 km on 22 September but there wasn´t ash detected on satellite images.
Rabaul Volcano Observatory reported that there were ash plumes from Rabaul caldera's Tavurvur cone. They rose to an altitude of 1.2 km on 20
September.
During 19-23 September, steam and steam-and-ash plumes from Colima
rose to altitudes of 4-4.9 km (13,100-16,100 ft) a.s.l. and drifted SW, W, and SE.
jeudi, janv. 01, 1970
AVO increased the Volcanic Alert Level to Advisory and the Aviation
Color Code to Yellow for Augustine on 22 September due to an increase in seismic activity below the summit over the previous week. During 22-25 September, the earthquakes were generally less than M 1 and were located at shallow depths beneath the summit.
jeudi, sept. 27, 2007
There have been observations of pyroclastic flows that traveled W of Arenal on September 18. Aslo ahs was produced and avalanches have been reported.
KVERT reported that seismic activity at Shiveluch was above background
levels during 7-14 September. During 6-9 September, avalanches occurred and ash plumes rose to altitudes of 4-6.5 km (13,100-21,300 ft) a.s.l. Observations of video data indicated that ash plumes rose to an altitude of 4.5 km (14,800 ft) a.s.l. on 7 September. Gas-and-steam plumes were noted on 7, 10, and 11 September. A thermal anomaly was present in the crater on satellite imagery during the reporting period. The Level of Concern Color Code remained at Orange
White vapor plumes rose from Rabaul caldera's Tavurvur cone from 10-18 September. On 16, 18, and 19 September, occasional ash plumes rose to an altitude of 0.9 km and drifted W or NW. Slight ashfall was reported in areas around.
jeudi, janv. 01, 1970
AVO reported that seismic activity at Pavlof declined markedly during
8-18 September, compared to levels recorded during the first week of September. Seismicity was characterized by volcanic tremor, and signals interpreted as small explosions. Based on observations of satellite imagery, a steam plume rose to an altitude of 6.1 km (20,000 ft) a.s.l. on 12 September and multiple thermal anomalies were present during 12-14 September. The Volcanic Alert Level remained at Watch and the Aviation Color Code remained at Orange jeudi, sept. 27, 2007
Based on observations of satellite imagery, the Darwin VAAC reported
that ash plumes from Manam rose to an altitude of 3.7 km (12,000 ft) a.s.l. on 17 September and drifted W.
HVO reported that during 12-18 September fissure segment D from
Kilauea's 21 July fissure eruption continued to feed an advancing 'a'a lava flow that frequently overflowed its channel edges. Several of the lava flows that branched from the main channel continued to advance, widening the flow field. An 'a'a flow that developed within the previous two weeks crusted over and pahoehoe breakouts issued from near the flow front on 14 September. A few small earthquakes were located beneath Halema'uma'u crater, the S flank, and the lower SW rift zone during the reporting period.
Seismic activity at Karymsky was above background levels during 7-14
September. Based on seismic interpretation, ash plumes may have risen to an altitude of 3.5 km (11,500 ft) a.s.l. during the reporting period. Observations of satellite imagery revealed that ash plumes drifted E and SE during 7-10 September and a thermal anomaly was present in the crater during 8-10 and 11 September. The Level of Concern Color Code remained at Orange
KVERT reported that explosions from Chikurachki produced ash plumes ...plus [lire toutes]
CVGHM reported that the Alert Status of Kelut was raised on 11 September from 1 to 2 (on a scale of 1-4). According to a news report, the water in the crater lake increased in temperature and changed color from the usual green to yellow. Villagers and tourists were advised not go within a 5 km radius of the active crater.
Eruption from Ruapehu: Science Alert Level = 2 ...plus [lire toutes]
vendredi, sept. 14, 2007
Tungurahua volcano continues to erupt. Although still considerable, the intensity of activity has been showing a decreasing trend in the past weeks and months. Intermittend explosions produced plumes rising to altitudes of 5.3-8 km (17,400-26,200 ft) a.s.l. during 5-6 and 9-10 September. ...plus
No significant changes have been registered at Mt. St. Helens. CVO's instruments monitoring the volcano indicate that the lava dome continues be active and grow slowly.
jeudi, janv. 01, 1970
L'activité au volcan de Pavlov continue à la fluctuation des niveaux. À en juger par les données sismiques et des observations visuelles - souvent difficile en raison de la couverture nuageuse, - éboulements et des explosions de faibles fréquentes sont en place et une forte anomalie thermique continue à être visible dans la région du sommet sur les données du satellite, indiquant que le nouveau dôme de lave est encore en croissance.
vendredi, sept. 14, 2007
The Alaska Volcano Observatory lowered the alert level at Cleveland volcano from Orange to Yellow on 6 Sep. Since late July, no signs of eruptive activity have been registred.
jeudi, sept. 13, 2007
Laguna Caliente, the frequently visited summit lake of Poás volcano, exhibits signs that increased fumarolic activity is happening at the bottom of the lake: now greenish-gray in color, convection cells in the lake's center and dark gray floating particles are being noted. ...plus [lire toutes]
Unrest at Turrialba volcano continues. Increased fumarolic activity had started in August 2006 and is concentrated mainly to the W of Turrialba's central crater. ...plus [lire toutes]
Arenal volcano continues to be mildly active. Over the past weeks, activity at crater C consisted of gas emissions, sporadic Strombolian eruptions, lava flows traveling down the SW and S flanks, and occasional avalanches from lava-flow fronts. Blocks from the lava-flow fronts periodically reached vegetation and started small fires. Acid rain and small amounts of ejected pyroclastic material affected the NE and SE flanks. Eruptions produced ash plumes that rose about 2.2 km (7,100 ft) a.s.l. Pyroclastic cones on the NE and SW flanks continued to grow. Small avalanches of volcanic material traveled down several ravines. Crater D showed only fumarolic activity. ...plus [lire toutes]
We have now finished our planning for the new dates of the tours on Santorini and southern Italy in the first half of 2008. Further information is found on the individual tour pages. Have a look - we would be happy to welcome you on one of our new tours!
- The VolcanoDiscovery Team mardi, sept. 11, 2007
As more evidence about the large eruption at Lengai volcano on 4-5 Sep is pieced together, it appears that the eruption was probably a mainly explosive event while evidence of significant lava flows on the flanks becomes less. The observed "lava flows" could have been bush fires ignited by hot ejecta. In any case, there is little doubt that the observed ash cloud was the result of a significant explosive eruption and not just landslides on the steep flank. ...plus [lire toutes]
jeudi, sept. 06, 2007
It seems that the eruption at Lengai is indeed a major event and that explosive activity has taken or is taking place in addition to lava flows and probably, bush fires. According to local sources from the nearby Moivaro - Lake Natron Camp, Lengai first erupted at midnight and at 6 am on 4 September. A pilot reported ash rising to 20,000 ft (ca. 6 km). Ashfall was reported from Engaresero Village, but there are no reports on injuries or fatalities. The highly regarded Moivaro Tented Lodge near Lake Natron has been temporarily evacuated. ...plus
 Satellite image of the eruption at Lengai volcano (image: NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team) A large eruption seems to be taking place at Lengai volcano, this time for real: On 4 Sept., reports started coming in that a large (natrocarbonatite?) lava flow is descending the West flank. A considerable ash plume was visible on satellite data. ...plus [lire toutes]
People from villages near Pago reported a a single booming noise and viewed white vapor emissions on 27 August. Increased seismicity was observed during 27-28 August. Lava was thrown out of the second crater on 28 August and steam could be seen.
mercredi, sept. 05, 2007
jeudi, janv. 01, 1970
Cratère SE du Etna, le plus jeune et plus active de son sommet 4 de ces dernières années
samedi, sept. 01, 2007
Pavlov's eruption continues and it seems increasing. A strong eruption took place yesterday: at approximately 9:30 pm local time (AKDT) on August 31, National Weather Service observers in Cold Bay reported a substantial plume and associated lightning emanating from Pavlof Volcano reaching approximately 20,000 ft (6,000 m) above sea level.
If activity continues to increase in intensity, larger ash clouds that could affect higher-flying aircraft may be produced. The most immediate ground hazard in the vicinity of the volcano includes light ash fall on nearby communities.
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