L'éruption qui avait commencé le 10 mai de cette année, continue encore à faible émission de lave de la fissure évents est de SE le cratère à 2900 m d'altitude.
La lave continue d'affluer dans la Valle del Bove, mais pour la plupart du temps et à sa façon, la lave active est cachée à l'intérieur des tubes et croûte-sur des canaux. ...plus [lire toutes]

A new eruption started at Piton de la Fournaise volcano at 15h30 local time on Sep 21, 2008. ...plus

Based on SIGMET reports and pilot observations, the Buenos Aires VAAC reported that during 5-6 September ash plumes from Ubinas rose to altitudes of 5.5-6.4 km (18,000-21,000 ft) a.s.l. and drifted NE and SE. Geologic Summary. A small, 1.2-km-wide caldera that cuts the top of Ubinas, Peru's most active volcano, gives it a truncated appearance. Ubinas is the northernmost of three young volcanoes located along a regional structural lineament about 50 km behind the main volcanic front of Peru. The upper slopes of the stratovolcano, composed primarily of Pleistocene andesitic lava flows, steepen to nearly 45 degrees. The steep-walled, 150-m-deep summit caldera contains an ash cone with a 500-m-wide funnel-shaped vent that is 200 m deep. Debris-avalanche deposits from the collapse of the SE flank of Ubinas extend 10 km from the volcano. Widespread Plinian pumice-fall deposits from Ubinas include some of Holocene age. Holocene lava flows are visible on the volcano's flanks, but historical activity, documentedsince the 16th century, has consisted of intermittent minor explosive eruptions.

The IG reported that clouds mostly prevented visual observations of Tungurahua during 3-9 September. On 3 September, a small lahar carried blocks down river drainages to the NW. Steam plumes rose 200 m above the crater on 6 September. On 8 September, a lahar descended a drainage to the S and carried blocks up to 50 cm in diameter.

Based on reports from JMA, the Tokyo VAAC reported explosions from Suwanose-jima during 5-7 September. Resultant plumes rose to altitudes of 1.5-1.8 km (5,000-6,000 ft) a.s.l. Plumes drifted E on 5 September.

MVO reported that during 29 August-5 September, data suggested that the W side of the Soufrière Hills lava dome continued to grow. Lahars and rockfalls dominated the activity. Lahars likely descended the Tar River valley on 29 and 31 August. On 1 September, a lahar descended the Belham River valley to the NW; the event lasted approximately 50 minutes. A new vent on the NW part of the lava dome, a little further N of the previous Gages vent, was observed during an overflight on 4 September. The smell of volcanic gases was occasionally noticed when the wind blew N and NE. The Hazard Level remained at 3.

KVERT a signalé que l'activité sismique à Chiveloutch a été légèrement au-dessus des niveaux de fond pendant 29 août-5 septembre. Les panaches de gaz-et-vapeur avec une petite quantité de cendres ont généré des avalanches 29 et 30 août et rose à une altitude de 4 km (13 100 pieds) d'altitude l'analyse de l'imagerie satellite révèle une anomalie thermique quotidienne sur le dôme de lave. Le Code de couleur du niveau de préoccupation reste à Orange.

Based on information from JMA, the Tokyo VAAC reported that on 7 ...plus [lire toutes]

It was reported that ash plumes from Rabaul caldera's Tavurvur cone continued to be emitted during 1-8 September. Ashfall was also reported in areas downwind. Ash accumulation in Rabaul Town was clear in mid-to-late July and in August; fresh ashfall and re-suspended ashfall due to winds and cars caused "unpleasant" conditions. During 1-6 September, conditions improved due to decreased ashfall, changes in wind patterns, and light rains that inhibited ash re-suspension. Continuous incandescence at the summit was observed, and roaring and rumbling noises were heard. Explosions also ejected incandescent lava fragments. ...plus

There was reported that a seismic crisis at Piton de la Fournaise during 8-9 September was characterized by hundreds of earthquakes. The Alert Level was not changed.

It was reported that clouds had prevented visual observations of Llaima during 29 August-2 September. On 3 September, fumarolic plumes that originated from three points on the pyroclastic cones in the main crater drifted N. An explosion produced an ash plume that also drifted N; ash deposits on the N flank suggested previous emissions. On 4 September gas plumes from the main crater drifted W. Gas-and-steam plumes were emitted during 5-7 September. The Volcanic Alert Level remained at Yellow

It was reported that during 3-9 September, lava flowed SE through a lava tube system from underneath Kilauea's Thanksgiving Eve Breakout (TEB) and rootless shield complex, reaching the Waikupanaha ocean entry and one further to the E. On 5 September, geologists saw multiple surface flows during an aerial observation: four on the coastal plain, and a large 'a'a flow and a small pahoehoe flow in the abandoned Royal Gardens subdivision.

It was reported that during 3-9 September seismic activity from Kasatochi was low. Vigorous steam-and-gas plumes rose above the crater and drifted up to 32 km downwind. On 4 September the Volcano Alert Level was lowered to Advisory and the Aviation Color Code to Yellow. Weak thermal anomalies were detected on 5 and 7 September.

It was reported that seismic activity at Karymsky was above background levels during 29 August-5 September. Explosions may have generated ash plumes to an altitude of 3.8 km (12,500 ft) and the analysis of satellite imagery revealed ash plumes drifting SE on 29 ...plus [lire toutes]

It was reported that during 3-5 September two moderately vigorous plumes from Chaitén were visible on a web camera and rose to altitudes of 2.1-3.1 km. The plumes drifted NW, N, SE, and S. Based on web camera views, analysis of satellite imagery, and information from the Puerto Montt Flight Information Region (FIR), the Buenos Aires VAAC reported that during 3-6 and 8 September, ash plumes rose continuously to altitudes of 1.5-3 km (5,000-10,000 ft) a.s.l. and drifted NW, ESE, and SE.

After several weeks of elevated explosive activity at the summit of Kilauea volcano, the Halema'uma'u vent which opened on March 19 has doubled in size to a current diameter of 65 m (215 ft), allowing scientists hovering above on September 9 the first views of a now-exposed lava lake about 100 m (330 ft) below the vent rim. The lava lake, estimated to be 50 m (160 ft) in diameter, was seen to be roiling, bubbling, and overturning, with its surface level rising and falling as a result of gas pistoning, periodic bursts that release coalescing gas bubbles from beneath the lake's frozen crust in an explosion of lava rock and spatter. ...plus [lire toutes]

Soufrière Hills volcano produces small pyroclastic flows going down the Tar River on the East flank of the lava dome, which continues to grow with lava extrusion on its western part.

On 18 August ash plumes from Ubinas rose to altitudes of 5.5-6.4 km (18,000-21,000 ft) a.s.l. and drifted W.

KVERT reported that seismic activity at Shiveluch was slightly above background levels during 8-15 August. Analysis of satellite imagery revealed a daily thermal anomaly on the lava dome. Based on information from KEMSD and observations of satellite imagery, the Tokyo VAAC reported that on 15 August an eruption plume rose to an altitude of 4.6 km (15,000 ft) a.s.l. The Level of Concern Color Code remained at Orange.

Based on analysis of satellite imagery and reports from RVO, the Darwin VAAC reported that during 13-19 August, low-level plumes from Rabaul caldera's Tavurvur cone rose to altitudes of 1.5-2.4 km (5,000-8,000 ft) a.s.l. and drifted WNW and NW. During 16-18 August, RVO reported ashfall in areas downwind. Occasionally incandescence at the summit was observed and roaring noises were heard. Explosions also ejected incandescent lava fragments.

AVO reported that on 13 August low-level steam-and-ash plumes from Okmok were visible on satellite imagery drifting SE at altitudes of 3-4.6 km (10,000-15,000 ft) a.s.l. During 14-17 August satellite observations were hindered due to cloud cover; seismic levels fluctuated possibly indicating that steam-and-ash emissions continued. During 18-19 August, ash plumes were seen on satellite imagery at altitudes of 3-4.6 km (5,000-15,000 ft) a.s.l. The Volcano Alert Level remained at Watch and the Aviation Color Code at Orange.

Based on analysis of satellite imagery, the Washington VAAC reported that a diffuse steam plume from Masaya drifted WSW on 12 August and a gas plume was detected on 18 August. Both plumes possibly contained ash.

Based on analysis of satellite imagery and information from RVO, the Darwin VAAC reported that low-level ash plumes from Manam rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted NW during 16-17 August.

During 8-11 August, SERNAGEOMIN reported that fumarolic activity from the snow-free pyroclastic cones in Llaima's main crater was visible during periods of clear weather; resultant plumes drifted E. A 2-km long strip on the NE flank was black in color (snow-free) due to elevated temperatures. On 13 August, gas-and-ash plumes rose to an altitude of 3.3 km (10,800 ft) a.s.l. and drifted E. Later that day, incandescence from the crater accompanied the gas-and-ash emissions.

According to a news article, explosions and earthquakes from Anak Krakatau averaged 120 per day approximately during 11-17 August. Monitoring personnel observed active lava flows, ejecting rocks, and emissions of "smoke."

HVO reported that during 13-19 August, lava flowed SE through a lava tube system from underneath Kilauea's Thanksgiving Eve Breakout (TEB) and rootless shield complex to the Waikupanaha ocean entry. Earthquakes were in various locations along the Koa'e fault system, S and W of the caldera, beneath the summit, along the S-flank faults, and along the E and SW rift zones. The vent in Halema'uma'u crater continued to produce a predominantly white plume with minor ash content that drifted mainly SW.

Based on interpretations of seismic data, possible ash plumes rose to an altitude of 3.1 km (10,200 ft) a.s.l. on 8, 10, 11, and 14 August. Analysis of satellite imagery revealed a thermal anomaly in the crater on 11 August; clouds inhibited views on other days. The Level of Concern Color Code remained at Orange.

The Darwin VAAC reported that on 19 August an ash plume from Dukono rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted W.

During 13-18 August, gray and white plumes from Colima were observed and rose to altitudes of 4-4.7 km (13,100-15,400 ft) a.s.l. and drifted SW, W, and N.

KVERT reported that clouds prevented satellite image views of Chikurachki during 8-15 August. The level of seismicity was unknown because Chikurachki lacks dedicated seismic instruments. The Level of Concern Color Code remained at Orange. ...plus

It was reported that continuous emissions of gas-and-ash plumes from Chaitén were observed on 13 August. ...plus

Based on analysis of satellite imagery, the Darwin VAAC reported that during 14-17 August ash plumes from Batu Tara rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted W.

A new lava extrusion from Soufrière Hills started from the W side of the lava dome between the 28 July lava-dome collapse event and 8 August, when a new channel of fresh rockfall material was seen below Gages Wall. During 8-15 August, seismicity and the rate of lava extrusion were generally low and sulfur dioxide emissions were elevated. On 14 August the W side of the dome was visible and the explosion crater that was generated on 28 July was almost completely filled with new lava. Lava spilled over the lower and W side of the crater and generated rockfalls below Gages Wall that were observed and heard from St. George's Hill. During 14-15 August, the scent of volcanic gases was noticeable at times in inhabited areas of Montserrat. The Hazard Level was 3.

A small seismic crisis beneath the summit of Piton de la Fournaise lasted a little more than two and a half hours on 15 August. Deformation was also detected at the top of Dolomieu and, coupled with the increase in seismicity, prompted OVPDLF to raise the Alert level to 1. Public access to the summit was prohibited. On 18 August, the Alert Level was lowered because seismicity had decreased and deformation was no longer detected.

It was reported that during 13-19 August seismic activity from Kasatochi was detected by stations on Great Sitkin, about 40 km W. On 17 August, the smell of sulfur was reported in the town of Adak.

A thermal anomaly was reported at Bezymianny's lava dome during 9-14 August and there have been some earthquakes. It is possible that hot pyroclastic avalanches occured. The Level of Concern Color Code remained at Orange. Observations of satellite imagery and information from KEMSD was showing an eruption plume of 7.9 km altitude.

The Tokyo VAAC reported an eruption plume that on 14 August rose to an altitude of 3 km a.s.l. and drifted S.

Three major explosive eruptions occured at Kasatochi between approximately 2230 UTC (14:30 AKDT) on 07 August and 0500 UTC on 08 August(2100 AKDT on 07 August). Ash from these explosions reached at least 45,000 ft above sea level. Ash emissions became continuous following the last explosive event and have produced a continuous ash cloud extending for more than 500 miles in a counterclockwise spiral. Ash from this continuous phase is likely at an altitude in excess of 35,000 ft above sea level. The possibility of larger explosive events continues. ...plus [lire toutes]

A subplinian or plinian eruption is taking place at Kasatochi volcano, a remote island in the Western Aleutian chain. AVO reports that satellite data show an ash plume to an altitude of at least 35,000 ft. in the vicinity of Kasatochi Volcano 22:30 UTC (14:30 ADT) on Aug. 7th, 2008. The plume is drifting to the south-southwest. ...plus

Ash emissions emitting plumes reaching several kilometers height continue at Okmok volcano.