Archived news:

Saturday, Mar 31, 2007
View of the lava dome (photo taken on 29 March 2007, courtesy of Eric Tomme)
View of the lava dome (photo taken on 29 March 2007, courtesy of Eric Tomme)

The lava dome at Soufrière Hills continues to grow, mainly on its NE side. Over the past week, pyroclastic flows mainly affected the sector from the ENE to the NW of the dome and traveled intermittently E down the Tar River Valley. Small flows (<500 m in length) occurred NW in Tyres Ghaut, and one flow was observed at the top of Farrell's Plain.

Mild strombolian activity continues at Klyuchevsky volcano. Over the past weeks, explosions were observed throwing lava bombs about 50-100 m above the crater.

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Another explosive event occurred at Sheveluch Volcano on March 29 at approximately 17h53 UTC. The Tokyo Volcanic Ash Advisory Center reported a cloud from this event to 40,000 ft above sea level extending northeast from the volcano and moving at 50 knots.  scientists with the Kamchatkan Branch of Geophysical Services estimated the cloud to be 33,000 ft above sea level, and a similar height was determined by AVO based on satellite data.  The eruption was brief, lasting only 6 minutes. 
With two brief but ash-producing eruptions in the past 24 hours, Sheveluch may be entering a period of heightened explosive activity.

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Friday, Mar 30, 2007

Explosions from Santa María's Santiaguito lava dome continue, producing ash-and-steam plumes to altitudes of 3.8-4.8 km (12,500-15,700 ft) a.s.l. Ashfall was reported from nearby areas. On 25 and 26 March, avalanches occurred from lava-flow fronts on the SW flanks of Caliente Dome. On 27 March, an explosion produced a pyroclastic flow that traveled down the SW flank.

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Thursday, Mar 29, 2007

Tungurahua continues to be the most active volcano in South America. During the past week, near-constant explosive activity produced plumes that rose to altitudes of 7-10 km (23,000-32,800 ft) a.s.l. and drifted mainly W, NW, and N. Ashfall was reported from areas downwind and from areas SW within 8 km, on all days except 25 and 27 March.
Noises resembling "cannon shots" and blocks rolling down the flanks were heard on 21, 22, and 25 March; windows rattled as far away as 11 km N in Guadalupe. On 23 March, lahars traveled mainly down NW gorges and affected the roads between Ambato and Baños, and between Baños and Penipe.

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New activity has started at Reventador volcano. In early March, the number of tectonic earthquakes from Reventador had increased. During 8-22 March, steam-and-ash plumes rising to altitudes of 4 km (13,000 ft) a.s.l. were observed sporadically.
On 21 March, noises were reported. The next day, seismic signals changed and indicated possible emissions. On 24 March, local people saw ash plumes and incandescent material near the crater and heard roaring noises. An explosion produced a plume that rose to an altitude of 6.6 km (21,700 ft) a.s.l. and drifted W. Based on reports from IG, the Washington VAAC reported an ash plume to altitudes of 3.7-7 km (12,000-23,000 ft) a.s.l. that drifted NE and WNW during 26-27 March. A thermal anomaly was present on satellite imagery during 24-27 March.

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Fuego volcano remains in a relatively active phase with strong stromblian activity. Ash plumes from explosions reach 4-5 km altitude and occasional ash fall occurs mainly in areas SSE and W of the cone.

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Basaed on visual observations, pilot reports and satellite data, Batu Tara volcano is producing near continuous ash eruptions with plumes rising to 1-2 km a.s.l.

The lava continues to flow on Stromboli. Three branches of lava flows originate at the 420 m vent on the Sciara del Fuoco, two of which still reach the sea.

Etna is active again. Following a rapid increase of tremor starting at 07h24 this morning (29 March, 2007), SE crater began to emit lava fountains and ash plumes until around 9 am. A field investigation showed that this activity, very similar to the episodes in November / December 2006, was accompanied by the effusion of three lava flows: one from the 3180 m vent in the saddle between Bocca Nuova and SE crater, one from the vent on the lower SE flank of Bocca Nuova at 3050 m and one from the SE base of the SE crater cone. The first flows reached the rim of the Piano caldera (marked by the slope break on the upper flank of Etna), the one from the SE crater went towards the Valle del Bove, stopping short of the 2800 m hornito which had been the site of persistant lava effusion from Oct - Dec. 2006.

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