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Backgound: Sierra Negre is the largest of the Galapagos volcanoes, with a caldera 10 km in diameter. Its last eruptino occurred in 1979; the lava flows of that eruption did not pose any significant risk to the population of the island.

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Source: El Universo

A team of scientists visited the Da'Ure locality immediately adjacent to the NE flank of the Quaternary Dabbahu (or Boina) felsic complex on 4 and 5 October after receiving reports of volcanic activity there on 26 September.
People in the area noted that on 26 September at about 1300 a very strong earthquake shook the area, and was followed by a dark column of "smoke" that rose high into the atmosphere and spread out to form a cloud, which darkened the area for 3 days and 3 nights. The scientists determined that a minor explosive eruption occurred from two semi-circular vents, producing ashfall that was ~5 cm thick near the vent. Ash deposits extended more than 500 m from the vent. Boulders emitted during the eruption were as large as 3 m and were deposited as far as 20 meters away. The scientists noted intense degassing from the vents, the scent of sulfur dioxide, and the sound of boiling water in the vents.  As of about 10 October, the Addis Ababa University Geophysical Observatory reported that seismic activity in the area was continuing.

Background: Dabbahu, also known as Boina or Moina, is a Holocene volcanic massif forming an axial range of the Afar depression SSW of the Alayta massif. Pantelleritic obsidian flows, lava domes, and pumice cones form the summit and upper flanks of the volcano, which rises above the Teru Plain and was built over a base of basaltic-to-trachytic lava flows of a shield volcano. Late-stage basaltic fissure eruptions occurred at the NW base of the volcano. Abundant fumaroles are located along the crest of the volcano and extend NE towards Alayta.

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Source: GVP/USGS Weekly Volcanic Activity Report, 12-18 October 2005

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Source: Volcano Observatory of Piton de la Fournaise

The weak intensity of tremor is probably due to the relatively ease with which magma rises from a shallow magma chamber to the surface. In fact, the area of the eruption has already been heavily fractured before: it appears that the magma is using approximately the same paths as during the Nov. 2002 eruption that occurred at the same site, as well as the subsequent eruptions in June, July and August 2003.

Authorities are discussing the possibilities to open access - free or organized - to the eruption site to the public.

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Source:  Thomas Staudacher

A group of scientists assessed the visible changes at Erta Ale on 26 September after activity began around 24 September. In comparison to observations made in November 2004, they found that the southern main crater/pit had widened significantly, with portions of the previous crater walls having collapsed into the lava lake. A new cone-shaped construct had grown within the southern main crater where there had been a platform. A lava lake occupied the entire width of the inner crater/pit. In the northern crater/pit, there was a solidified lava bulge and abundant "smoking" along the crater walls. No incandescent lava was visible in the pit.
Based on descriptions by local residents of seeing "red and glowing light shooting and rising into the air above the volcano," the scientists believe that a Strombolian eruption probably occurred, emitting a significant volume of fresh magma within, and possibly out of, the pit.

No fatalities have been reported, but the Ethiopian government evacuated about 50,000 nomads in the surroundings of the volcano. A committee has been set up at to study the magnitude of the damage.

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Source: GVP/USGS Weekly Volcanic Activity Report, 21-27 September 2005

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Source: RIA Novosti, Oksana Guseva

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Source: Instituto Nacional de Sismologia, Vulcanologia, Meterologia, e
Hidrologia http://www.insivumeh.gob.gt/geofisica/boletin%20formato.htm

- I am finally back in Europe, Doni and me wish to thank you all a lot for the great company, and the good tour we've had together. I will gradually post more photos of the tour on this website as well as on www.decadevolcano.net.
Greetings from Athens,-

Tom & Doni, VolcanoDiscovery Indonesia Team

During 1-5 September, volcanic activity at Tungurahua remained at low levels with small emissions of steam, gas, and variable ash content. On 1 September, ash fell in the Puela sector, ~ 8 km SW of the summit.

Background: The steep-sided Tungurahua stratovolcano towers more than 3 km above its northern base. It sits ~140 km S of Quito, Ecuador's capital city, and is one of Ecuador's most active volcanoes. Historical eruptions have been restricted to the summit crater. The latest eruption began in October 1999 and prompted temporary evacuation of the town of Baños on the N side of the volcano.

Source: Instituto Geofisico-Escuela Poltecnica Nacional
http://www.igepn.edu.ec/vulcanologia/tungurahua/actividad/informet.htm

Tungurahua Information from the Global Volcanism Program
http://www.volcano.si.edu/world/volcano.cfm?vnum=1502-08=

Growth of the new lava dome inside the crater of Mount St. Helens continued during 31 August  to 6 September, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash.  On 6 September, dry conditions and rockfalls from the lava dome generated occasional ash plumes that rose above the volcano and rapidly dissipated. St Helens remained at Volcano Advisory (Alert Level 2); aviation color code Orange.

Source: USGS Cascades Volcano Observatory

Growth of Shiveluch's lava dome continued during 26 August to 2 September, and viscous lava continued to flow at the lava dome. Several ash plumes reached ~5.5 km (18,050 ft) a.s.l. Shiveluch remained at Concern Color Code Orange.

During 22-28 August, there was a decrease in activity at Reventador in
comparison to the previous week. Seismicity and gas emissions decreased at the volcano, and no surficial changes were observed. On 1 September a pilot reported an ash cloud to the Washington VAAC, but no ash was visible on satellite imagery.

Sources: Instituto Geofisico-Escuela Poltecnica Nacional
http://www.igepn.edu.ec/vulcanologia/tungurahua/actividad/informet.htm,
Washington Volcanic Ash Advisory Center
http://www.ssd.noaa.gov/VAAC/messages.html

Reventador Information from the Global Volcanism Program
http://www.volcano.si.edu/world/volcano.cfm?vnum=1502-01=

During 1-5 September, lava from Kilauea entered the sea at the East Lae`apuki area, and surface lava flows were visible on the Pulama Pali fault scarp. On 27 August, part of a lava bench (land built out from the sea cliff) collapsed.

Background: Kilauea, one of five coalescing volcanoes that comprise the island of Hawaii, is one of the world's most active volcanoes. Eruptions at Kilauea originate primarily from the summit caldera or along one of the lengthy E and SW rift zones that extend from the caldera to the sea. This long-term ongoing eruption from Pu`u `O`o-Kupaianaha has produced lava flows that have traveled 11-12 km from the vents to the sea, paving about 104 km2 of land on the S flank of Kilauea and building more than 200 hectares of new land.

Source: US Geological Survey Hawaiian Volcano Observatory
http://volcanoes.usgs.gov/update.html

Kilauea information from the Global Volcanism Program
http://www.volcano.si.edu/world/volcano.cfm?vnum=1302-01-

26 August to 2 September gas and ash plumes haven been rising up to 4,5 km about sea-level. Karymsky remained at Concern color code Orange.

A plume from Dukono was observed on satellite imagery on 2 September at a height of ~3 km a.s.l. extending NW.

Background: Reports from this remote volcano in northernmost Halmahera are rare, but Dukono has been one of Indonesia's most active volcanoes. More-or-less continuous explosive eruptions, sometimes accompanied by lava flows, occurred since 1933 until at least the mid-1990s, when routine observations were curtailed. During a major eruption in 1550, a lava flow filled in the strait between Halmahera and the N-flank cone of Gunung Mamuya.

Source: Darwin Volcanic Ash Advisory Center
http://www.bom.gov.au/info/vaac/advisories.shtml

Dukono Information from the Global Volcanism Program
http://www.volcano.si.edu/world/volcano.cfm?vnum=0608-01=

During 31 August to 6 September, several small explosions occurred at Colima. On 31 August during 1245-1330, a seismic signal associated with a lahar was recorded at the Monte Grande station.

Background: The Colima volcanic complex is the most prominent volcanic center of the western Mexican Volcanic Belt. It consists of two southward-younging volcanoes, Nevado de Colima (the 4,320 m high point of the complex) on the N and the historically active Volcán de Colima on the S. Volcán de Colima (also known as Volcán Fuego) is a youthful stratovolcano constructed within a 5-km- wide caldera, breached to the S, that has been the source of large debris avalanches.

Frequent historical eruptions date back to the 16th century. 

Source: Universidad de Colima http://www.ucol.mx/volcan/

Colima Information from the Global Volcanism Program
http://www.volcano.si.edu/world/volcano.cfm?vnum=1401-04=

On 1 September, a plume from Barren Island was visible on satellite imagery at a height of ~3 km  a.s.l. extending ~90 km NE of the summit. The current eruption of Barren Island began on 28 May.

Background: Barren Island, a possession of India in the Andaman Sea about 135 km NE of Port Blair in the Andaman Islands, is the only historically active volcano along the N-S-trending volcanic arc extending between Sumatra and Burma (Myanmar). The 354-m-high island is the emergent summit of a volcano that rises from a depth of about 2,250 m. 
Lava flows fill much of the caldera floor and have reached the sea along the western coast during eruptions in the 19th century and more recently in 1991 and 1995.

Source: Darwin VAAC http://www.bom.gov.au/info/vaac/advisories.shtml

Barren Island Information from the Global Volcanism Program
http://www.volcano.si.edu/world/volcano.cfm?vnum=0600-01=

During 1-3 September, eruptive activity continued at Anatahan with ash plumes rising to a maximum height of ~3 km a.s.l.

Background: The elongate, 9-km-long island of Anatahan in the central Mariana Islands consists of large stratovolcano with a 2.3 x 5 km, E-W-trending compound summit caldera.  The larger western caldera is 2.3 x 3 km wide, and its western rim forms the island's 790-m high point. 
The first historical eruption of Anatahan did occur May 2003, when a large explosive eruption took place forming a new crater inside the eastern caldera.

Source: Emergency Management Office of the Commonwealth of the Mariana Islands
and the US Geological Survey Hawaiian Volcano Observatory
http://volcanoes.usgs.gov/updates.html

Anatahan Information from the Global Volcanism Program
http://www.volcano.si.edu/world/volcano.cfm?vnum=0804-20=