Toutes les actualités et mises à jour sur les volcans:
Abbreviated from a report sent by the Kamchatkan Volcanic Eruptions Response Team:...plus
New interesting developments take place on La Réunion island, where the eruption has entered e new phase:
While visual lava emission from the vents in the Plaine des Osmondes at about 1600 m a.s.l. more or less stopped on the 24th, a large river of lava, believed to originate from accumulation beneath the flow field emerged from there on the afternoon of the 25th, travelling about 5 km in less than 2 hours down the Grandes Pentes (the steep ocean-side slope inside the horse-shoe-like open caldera), cutting the national road and entering the ocean.
From Thursday 24th on, shallow earthquakes appeared seismicity beneath Dolomieu crater on the summit of the volcano, increasing to a swarm with several hundreds of quakes up to magnitude 3 on Saturday 26th. This might be an indicator of the formation of a new pit crater.
At the same time, a new vent opened on the North East rift zone above "Bois Blanc" within the "Trou de Sable" on the northern boarder of the enclos at 450 m altitude. A new lava flow progressed within the enclos and stopped about 100 m above the national road.
The volcano observatory warnes that an eruption "hors enclos" (outside the caldera) now should be considered a possibility within the next days. The area is being kept under under close surveillance.
- abbreviated from a report by Thomas Staudacher, head of the volcano observatory
Added on 10 March:...plus [lire toutes]
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....plus [lire toutes]
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....plus [lire toutes]
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:...plus
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:
24 Feb. 2005
As the INGV reports, Etna's SE crater has resumed its emissions of dense black ash on the morning of the 24th.-
The SE crater, the youngest of Etna's 4 summit craters, had been the site of vigourous activity throughout much of 1998-2001, but remained quiet after the end of the July-August 2001 summit and flank eruption. In early 2005, sporadic ash emissions resumed, sometimes accompanied by visible glow at night, indicating that magma once more has risen inside its conduit. More spectacular activity from this crater might follow during the next weeks or months.
Source: INGV - Catania
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):
Since the 31th of January, lava from Kilauea volcano, Big Island, Hawai'i, is flowing into the sea again at two different entry points. Both entries, about 6 km apart, are well alimentated and consits of clusters of 10-15 separated entries, some as lava falls over older cliffs, some as lava gushing out from tubes directly into the surf or temporary black-sand beaches.
A great number of breakouts occur all over the slope connecting the vent Pu'u O'o and the coastal flat as well as on the coastal area itself. Pu'u O'o itself is brightly glowing at night, with about 15 active vents, some of which were observed violently spattering (as on Thu., 10th).
The VolcanoDiscovery team is on location and has visited the areas a few days ago and will probably post more updates including photographs in the coming days.