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As the National Institute of Geophysics and Volcanology reports, an increased number of small to medium earthquakes have occurred lately at Etna volcano, the largest one being today (Sun, 30 Oct. 05) at 3.7 magnitude Richter at 08h06 on the southeastern slopes near Pedara, Trecastagni et Nicolosi. Etna has been without eruptive activity since March 2005; new eruptions are expected within a near to medium future (months or few years, possibly less if the recent seismic activity is taken as possible precursor).
The eruption of Sierra Negre continues with lava flows confined to the vast caldera; it does not pose risks to populated areas. In the meanwhile, a group of scientists from the Geophysical Institute of Ecuador have visited the site and posted a detailed report about the eruption's first 3 days: it can be downloaded here.
The eruption is continuing from a fissure inside the E part of the caldera of Sierra Negre, with lava fountains up to 200 m tall and large lava flows that have now covered about 20% of the caldera floor. Good eruption viewing possibilities are from a lookout on the caldera rim in the El Cura area.
First photographs and more detailed information about the large eruption of Sierra Negre are emerging. As on Monday, 24 October, lava flows from a fissure have travelled 9-10 km away from the fissure. The eruption is accompanied by strong lava fountains. Near the eruption site, the terrain consists mainly of older, unvegetated lava flows. Two flows are travelling towards Elizabeth Bay, while a third one is heading towards Cartago Bay, both uninhabited areas.
The popoluation of Puerto Villamil is not threatened because of its sheltered position at the S of the island.
Sierra Negra volcano, also called "El Chico", on Isabela Island, Galapagos, erupted yesterday at 17h30 local time. As the Ecuadorian newspaper "El Universo" reports, an ash column estimated between 20 to 30 km high was observed. According witnesses from Santa Cruz island, two lava flows reached Elizabeth Bay, an uninhabitated settlement area close to the volcano. The island's main town, Puerto Villamil, 25 kilometers (15 miles) away, is not threatened by the eruption. Sierra Negro last erupted 1978....plus
Volcanic activity at Erta Ale reported previously actually occurred at Dabbahu:...plus [lire toutes]
Explosions and pyroclastic ejections continued at Dukono during 10-16 October. Ash columns rose 100-950 m above the summit (or 1,200-7,000 ft a.s.l.) and mainly drifted SE. Seismicity was dominated by explosion earthquakes. Dukono remained at Alert Level 2....plus [lire toutes]
This year's second eruption of Piton de la Fournaise volcano was ufficially declared to have ended today, after tremor had ceased abruptly yesterday at 13:10h local time on the 18th of Oct. 2005 while visual observations had yesterday not been possible due to bad weather.
Marco Fulle sends this report based on observations made by a VolcanoDiscovery group, who climbed Stromboli on 11 Oct. 2005: Stromboli's activity was significant, with 8 active vents in three clusters (corresponding to the former W, Central and E craters): during 1 hour, they observed 2 faint eruptions from the W vent nr. 1, which is hidden from Pizzo, while stong glow was visible from the second vent in the W crater. During the same time, 5 eruptions occurred from the westermost vent in the central vent complex (the former Central crater), emitting few bombs but lots of gas during its eruptions, and seven (!) eruptions ejecting lava to up to 250 m height were observed from the second central vent, which is now found at the top of a tall cone.
The eastern vent complex conprises 4 active vents: Blue flames were visible from E vent nr.1, while two simulataneous eruptions occurred from a second and third vent in the E crater, ejecting lava to up to 150 m. One of these vents is glowing visibly, the other one is hidden from Pizzo. A 4th vent, at the far E end of the E crater, is also hidden from Pizzo and was showing continuous spattering.