Toutes les actualités et mises à jour sur les volcans:
As the Geophysical Institute of Quito reports, strombolian activity at Tungurahua volcano and its seismicity have been increasing over the past days. On 28 June, 86 explosions were counted by the seismic network. In nearby villages, strong pressure waves could be felt from some of the explosions. A weak steam and ash plume is present over the summit and during the night, incandescent blocks are seen to be thrown out of the crater to heights of approximately 100 meters.
Karymski volcano remains the most active volcano on Kamchatka with frequent strong strombolian to vulcanian-type explosions producing ash plumes up to 3-4 km altitude....plus
During the past weeks and months, Stromboli has continued to show extraordinarily high activity as several groups of VolcanoDiscovery have observed.
During a visit on 24 June, 9 active vents were counted: two active vents in the NW crater (towards Ginostra), one of which exploded with tremendous noise every 20-30 minutes, throwing powerful jets of burning gas followed by large amounts of spatter to heights of up to 3-400 m, showering the OUTER rims of the crater terrace. A neighboring vent, a few meters away from it, is normally not visible, but when it erupted, it had the appearance of the ground opening and emitting glowing ash that slowy rose, blackened and created small ash plumes.
In the central crater, 4 visible glowing vents and one hidden behind the wall were active, the most prominent being the tall cone in the NE corner of the complex. The NE cone was spattering constantly, throwing spatter to considerable 50-100 m height. This activity was interupted every 5-10 minutes by strong, hissing fountains lasting up to 20 seconds, and thowing incandescent material to up to about 250 height. At times, the force of the fountain activated a second vent next to it, on the SE side of the cone, apparently serving as an additional valve whenever the output rate during the fountains from the cone itself becomes too large. Two other vents in the central crater complex were large, constantly glowing holes, but showed only occasional weak spattering and erupted only rarely strombolian bursts of spatter to 100-150 m height. A fith vent is not visible from Pizzo, but on a visit on 15 June, it was observed to erupt spatter occasionally to about 100 m height (about once per hour).On 25 of June, it was not erupting.
Last, there were two active vents in the NE crater (towards the village of Stromboli), one of which erupts spectacularly about every 20-30 minutes, throwing lots of incandescent bombs towards the E, showering the outer crater slope with bombs. These eruptions also produced dense ash clouds.
Etna continues its worrying slumber. After an isolated phreatic explosive event in January, the diafragma separating Bocca Nuova crater and the Voragine (the former Central crater) as well as the wall separating the two craters inside Bocca Nuova have mostly collapsed, leaving what is now best described as one single central crater with several pits and vents at considerable depth.
Several VolcanoDiscovery groups visited Etna on various occasions over the past weeks, and found strong degassing taking place from fractures in the walls and the bottoms of the various vents inside the central crater, as well as audible but deep-seated explosive activity inside North-East crater.
The eruption of Merapi is increasing in intensity and has claimed the first deaths: Two people were killed on Wednesday 14 June, 2006, by a particularly strong pyroclastic flow that reached the area, travelling almost 7 km from the summit. The two men managed to run into a shelter at the village of Kaliadem, east of Kinahrejo near Bebeng, on the SE flank of the volcano, but were trapped inside because flow covered the shelter with about 2 meters of hot deposits. Although they survived for a while, the heat of the deposits effectively baked them to death. Recue workers tried for over 24 hours to free them, interrupted only when new pyroclastic flows were theatening to reach the area again. When the shelter was dug out free, they could only find the dead bodies. The flow also damaged some buildings, which is the first time, the eruption affected structures and villages as well....plus [lire toutes]
After less than 24 hours, the alert level of Merapi volcano has been raised back again to the highest status of 4 on June 14, 2006. The decision followed a marked increase in activity with more frequent and longer pyroclastic flows travelling up to 3 km down the SW and SE flanks of the volcano.
Karymsky volcano remains the most active volcano on Kamchatka, with strong strombolian to vulcanian activity, often producing ash-loaden plumes reaching 4-5 km altitude.
Weak activity continues at Kanlaon volcano: Between 3 and 12 June, 4 small phreatic explosions occurred at the summit crater of Kanlaon volcano (3 June, 10 June, 2 times on 12 June). The explosions produced mainly steam and gas as well as small quantities of ash to heights up to 1000 m. Light ash-fall occurred on the upper slopes of the volcano. An exclusion zone of 4 km around the crater is being maintained. --->more on Kanlaon volcano...plus
Merapi has quieted down a bit after part of the lava dome collapsed on Friday evening. Less numbers and smaller pyroclastic flows have been recorded since the event that removed approximately 1/3 of the lava dome. As a result, VSI has downgraded the alert status from 4 to 3 on 13 June 2006 at 11.00 WIB....plus
Volcanic activity at Merapi continues to increase gradually since the earthquake of 27 May 2006, with the growing lava dome shedding glowing lava avalanches and pyroclastic flows that increase in number....plus [lire toutes]