Liste archivée des actualités:
jeudi, nov. 30, 2006
The eruption at Nyamuragira volcano continues. Protected by military from the OCHA and MONUC missions, scientist from OVG could overfly and visit the eruption area on 29 Nov. Their report (kindly provided by Kasereka Mahinda, director of OVG, and other staff at OVG), is summarized:
Ubinas volcano continues to erupt ash producing plumes rising to 4-6 km....plus
IG reported that during 21-28 November, emissions from Tungurahua produced ash and steam plumes that reached altitudes of 6-9 km (19,700-29,500 ft) a.s.l. and drifted predominantly NW and W. Ashfall about 1 mm thick was reported from areas 8 km WSW on 21 November and from areas 8 km W on 25 November.
During 17-24 November, lava-dome growth at Soufrière Hills continued and was concentrated on the NE part of the edifice. Ash venting originated from the westernmost of two cracks in the curved back of the shear E-facing lobe on the summit. Rockfalls and small pyroclastic flows traveled down the SW and NE flanks. Pyroclastic flows reached both the upper region of Tuitts Ghaut (N) and the sea via the Tar River Valley (E) on 23 November. An explosion produced an ash plume that rose to altitudes of 1.5-1.7 km (4,900-5,600 ft) a.s.l....plus [lire toutes]
Based on a pilot report, the Darwin VAAC reported an ash plume riging to 7.6 km (25,000 ft) on 22 November, drifting to the S. Various other reports and news sources indicate that the crater's typical strombolian is relatively powerful these days and that blocks and bombs are frequently ejected outside the crater.
Eruptions continue at Langila volcano from its Crater 2 with continuous emissions of gray ash plumes rising to altitudes of ca. 2-3.5 km and drifting predominantly to the W and NW.
According to the Darwin VAAC, an eruption at Karangetang on 24 November produced a small ash plume observed on satellite imagery that reached an altitude of 3 km (10,000 ft) a.s.l.
jeudi, janv. 01, 1970
Volcan Etna (Italie), mise à jour d'activité: nouvelle épisode éruptif avec des émissions de cendres le 29 novembre
Vue de la panache de cendres de l'Etna, le matin du 29 novembre (Snapshot d'une des webcams de Etnatrekking: www.etnatrekking.it)
A new episode of strong ash production, probably accompanied with strombolian activity from the SE crater took place in the morning of 29 November. Today (30 Nov.), no ash is visible. The lava flow in Valle del Bove from the 2800 m vent continues to flow. During the night, a number of breakouts and open channels are clearly visible....plus
mardi, nov. 28, 2006
Tobias Schorr will present active volcanoes (with some of Toms great photos) in Europe in the bistro "Hollywood" in Siegburg. 12 December 19:30.
Press photo taken on November 28, 2006, showing a large fissure and lava fountains several hundred meters high during the first day of Nyamuragira's eruption. (photo released by REUTERS/MONUC-United Nations/Handout)
One of the world's largest volcanoes, mighty Nyamuragira (also spelled Nyamulagira) in eastern Congo, is in eruption again. The eruption began around 10 pm local time on Monday, 27 Nov. 2006 as press reports.Observation of the eruption is difficult because of the unrest in the region. The area around Nyamuragira is difficult to access and home to a number of armed rebel troops notoriously opposing the government army.
jeudi, janv. 01, 1970
Volcan Etna (Italie), mise à jour d'activité: production de cendres du SE cratère, l'aéroport de Catane fermé jusqu'à mardi
Etna's SE crater continued to spew ash plumes travelling SE and forcing the closure of Catania's airport for the 4th consecutive day. Reopening is scheduled for Tuesday 28 Nov.
After the strong eruption on 24 Nov, that forced the temporary shutdown of Catania's airport because of ash, Etna calmed down again on 25 Nov. Following its apparent two-days rhythm, another (but weaker) episode of strong stombolian activity took place at the SE crater on the afternoon of 26 Nov.
Volcan Etna (Italie), l'activité mise à jour: nouveaux épisodes explosifs, des fontaines de lave et de cendres solides
A new powerful eruptive episode took place this morning at Etna volcano, where the SE crater started lava fountaining and ash emissions accompanied by new lava flows from the fracture on the upper southern slope of SE crater as well as from the 3050 m vent on the flank of Bocca Nuova.
Plan de cendres tombent après le paroxysme du cratère SE le 21 novembre 2006. (Source: rapport d'activité "Attivitesplosiva al Cratere di SE 21 novembre 2006» par Andronico, D. et Cristaldi, A. (22 nov. 2006), publié sur le site de l'INGV-Catane, www.ct.ingv.it)
In the late morning of 21 Nov, strong explosive activity resumed at SE crater, culminating in the so far strongest episode. Bad visibility inhibited direct observations of the lava fountains, but a significant ash plume was generated that caused ash fall in a broad sector east of the volcano. As INGV reports, more than 50 grams of ash per square meter were deposited in the town of Giarre.
jeudi, nov. 23, 2006
Fuego volcano's activity remains at moderate levels. Lava flows travel down the SW flank, reaching 150 m from the dome. Sporadic explosions eject bombs to 100 m above the crater.
IG reported that lahars from Tungurahua traveled NW down the gorges of Vazcún and Mandur on 14 and 15 November, respectively. During 16-19 November, emissions produced gas plumes with minor ash content that reached altitudes of 5.2-5.5 km (17,100-18,000 ft) a.s.l. On 17 November, an ash plume reached an altitude greater than 10 km (32,800 ft) a.s.l. and drifted NW and NE....plus
Santa María's Santiaguito lava dome has been very active during the past days and weeks. The strongest eruption in this period produced ash plumes that reached an altitude of ca. 5.3 km (17,400 km) a.s.l. on 15 November. Ashfall was reported from areas to the N. Lava flowed down the SW, S, and SE flanks of the Caliente dome....plus
The lava dome at Mount St. Helens continues to grow, and producing a prominent spine that rises by about 2-3 meters per day. Small tremors are frequently registered at the volcano, believed to be caused by the movements of the spine being pushed up by pressurized magma in the conduit....plus
jeudi, janv. 01, 1970
Another strong eruptive phase ("paroxysm") occurred at SE crater today (19 Nov 2006), characterized by a strong increase of lava output and corresponding activation of different vents, probably belonging to one and the same feeding system:
As INGV Catania reports, the 2800 m effusive vent is again in a phase of intense spattering and numerous breakouts from the lava tunnel feed several flow branches visible on webcams.
vendredi, nov. 17, 2006
Ubinas volcano continues to have episodes of continuous ash eruptions, probably phreatomagmatic in origin, with plumes rising to 5-7 km....plus
jeudi, nov. 16, 2006
Tungurahua continues to be one of the most active volcanoes at the moment.
The lava dome at Soufrière Hills continues to grow (mainly in the E part) and produce rockfalls and smal pyroclastic flows that travel down the SW and NE flanks.
jeudi, janv. 01, 1970
Our colleagues at INGV have published a comprehensive update about Etna's recent activity covering the period July-4 Nov, as well as a new report with a good map of the recently active lava flows at Etna.
Volcan Etna (Italie), mise à jour d'activité: nouvelle activité explosive au SE, l'effondrement sur le flanc de la SE cône, nouvelle fracture éruptive SE de SE cratère près du Belvédère
After its explosive phases on 9 Nov and 10-11 Nov, Etna had been relatively quiet over the past days. This changed again dramatically today (16 Nov):...plus [lire toutes]
lundi, nov. 13, 2006
We gladly announce two new study&walking tours we can offer you in Italy: one to the Bay of Naples from 8-15 April and a two-weeks tour of the Eolian Islands from 6-18 May 2007. Both tours will be guided by our Italian geologist Marta who is a true insider in both areas.
jeudi, janv. 01, 1970
Volcan Etna (Italie), mise à jour d'activité: une nouvelle activité brève explosive des 10-11 novembre calme de montagne, en baisse
While the 2800 and 3050 m vents continued to be active and aliment their lava flows, a new, weak phase of strombolian activity and ash emission was observed at the SE crater from late evening of 10 Nov lasting until around noon of 11 Nov.
A new explosive phase started at SE crater on the late evening of 10 Nov. and lasted until around noon of 11 Nov. New lava flows are issuing from the 3050 m vent at the SW fracture of SE crater (but located on the lower flank of the summit craters, Bocca Nuova and Voragine). The new flows are well alimentated and similar to previous episodes.
samedi, nov. 11, 2006
Anatahan volcano is continuing to emit gas and steam, but no significant ash emissions have been observed during the past few months.
Low-level earthquake activity continues at Fourpeaked volcano. Web camera views this past week show a typical steam plume rising several hundred meters above the summit....plus
Ubinas volcano continues to be very active. Based on pilot reports and satellite imagery, the Buenos Aires VAAC reported continuous emissions from Ubinas on 3, 5, and 7 November. Ash plumes rose to 6.1-7.9 km (20,000-26,000 ft) a.s.l. and drifted SW, N, and S, respectively....plus
Over the past weeks, weak to moderate activity continued at Tungurahua volcano. A number of smaller explosions produced plumes consisting of steam, gas, and moderate ash that reached altitudes of 1-3 km (3,300-9,800 ft) a.s.l. and drifted in multiple directions.
During 27 October-3 November, lava-dome growth at Soufrière Hills continued and was concentrated on the E and NE part of the edifice. Rockfalls and small pyroclastic flows originating from the active lobe traveled down the NE flank. Aerial observation confirmed the existence of a large, shear, E-facing lobe on the NE side of the dome. Ash-and-steam venting continued....plus
Based on reports from the Mexico City MWO and satellite imagery, the Washington VAAC reported that an eruption plume from Colima on 6 November reached an altitude of 6.1 km (20,000 ft) a.s.l. and drifted NE.
On 2 November, PHIVOLCS lowered the Alert Level for Canlaon from 1 to 0. Since 26 July, 2006, no more ash explosions occurred and steam emissions and seismicity were low.
jeudi, janv. 01, 1970
As INGV reports, the lava flows from yesterday that emerged from the new vents SW of SE crater (in the saddle and at and above the 3050 m fracture) have stopped. The longest flow, from the lowest vent at 3050 m has travelled about 3 km and stopped at an elevation of ca. 2200 m near the prominent cones from the 1607 lateral eruption.
vendredi, nov. 10, 2006
Out team partner Phil on Hawaii sends a report from a recent visit to the lava flow area:...plus
mercredi, nov. 08, 2006
Another day full of surprising and exciting activity at Etna is ending: in the morning, the hornito at the 2800 m vent in Valle del Bove started to collapse and spattering, feeding two small, viscous lava overflows....plus
mardi, nov. 07, 2006
The new lava flow and the explosive vent at the 3050 m fracture, SW of SE crater on the slope of Bocca Nuova as on the evening of 7 Nov. 2006.
Etna continues to surprise...: the new lava flow from the 3050 m vent that started on 5 Nov. had stopped yesterday (6 Nov). We visited the vent of the 2800 m lava flow and confirmed it is still well alimented as can be seen through an impressive skylight....plus
On a visit to Stromboli on 5 Nov by the VolcanoDiscovery team, Stromboli volcano was observed to be in relatively low activity (the lowest observed during the past 15 months), although there are still 7 active vents. The hornito in the NW crater continues to emit powerful, noisy jets of gas and few incandescent fragments. The central vents have typical strombolian bursts every 10-20 minutes, usually less than 150 m high, except for the vent in the NE corner of the central crater which was observed to produce tall candles, up to 3-400m high, about 1 time per hour. The NE crater vent (towards Stromboli village) has moderate eruptions about every 20-30 minutes, to about 100-150 m height, showering the E flank of the crater with incandescent bombs and emitting dark ash plumes of small size.
Etna volcano (Italy), activity update: old lava flows stopped, new explosive episode at SE crater and new lava flow
On 5 Nov. 2006, the lava flows from the 3050 m vent stopped, while the one from the 2800 m vent inside Valle del Bove continues to flow inside its lava tube. After an increase in tremor, another episode of lava foutaining and strombolian activity took place at the SE crater on the late evening of the same day. After this episode, another flow started to emerge from the 3050 m vent, travelling just east of the other recent flow that is now cooling.
lundi, nov. 06, 2006
Tom Pfeiffer has just send the recent photos of the November eruptions of Stromboli volcano. You find them here!
A new (likely ephemeral) island has risen to the surface in the Tonga islands (ufficially 169 islands), that now count 170 islands.
samedi, nov. 04, 2006
Both lava flows at Etna are still active, with little changes observed during the past days. The flow rates seem to be more or less constant, at an estimated 5-10 m3/s. The flow from the vent at 3050 m elevation forms a broad channel with fast moving lava on the slope of Bocca Nuova. The other flow inside Valle del Bove has crusted over in its upper parts, but several large skylights are still visible in the upper areas of the flow....plus
jeudi, nov. 02, 2006
Broad, sheet-like flow in the flat area beneath the summit cone (1 Nov 2006).
Part of the VolcanoDiscovery team (Karen, Marco and Tom) are now visiting Etna. On 1st of Nov., two vigorous lava flows were active,- the one that had started on 13 Oct on the ESE side of SE crater from the vent at 2800 m elevation and flowing into Valle del Bove, as well as the new flow from the vent at 3050 m elevation on the S slope of the central crater.
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