Based on analysis of satellite imagery, the Darwin VAAC reported that on 4 October a possible eruption from Karangetang generated a plume that rose to an altitude of 12.2 km (40,000 ft) a.s.l.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

RVO reported that forceful emissions of dense white plumes from Garbuna were accompanied by intermittent ash emissions during 1-4 October to an altitude of 1.6 km (5,200 ft) a.s.l. Occasional weak roaring and rumbling noises were reported in Garu village, about 9 km NW. An overflight on 3 October revealed that existing vents at the summit had increased in size and new vents and fumaroles appeared in the E sector of the lava dome. The main vent that had been restricted to the outside flank of the cone had enlarged considerably (more than tripled in size) and merged with the November 2005 vent. The original vent that opened on 17 October 2005 was larger and vigorously fuming. Although there was little evidence of juvenile material having been ejected and there was surprisingly little eruptive material around the summit, it and areas more than 1 km away from the active vents were cratered, possibly from lithic bombs. Fumarolic activity in the summit region away from the currently active vents had ceased.

Source: Rabaul Volcano Observatory (RVO)

According to Frederick Belton's website, a local camper reported a small eruption from Ol Doinyo Lengai on 1 October. Details of the eruption were not provided.

Source: Ol Doinyo Lengai (Fred Belton)

OVPDLF reported that the eruption from Piton de la Fournaise that started on 21 September from the inner W wall of Dolomieu crater ended on 2 October. The total volume of erupted lava was about 850,000 cubic meters based on analysis of aerial photographs.

Source: Observatoire Volcanologique du Piton de la Fournaise (OVPF)

AVO reported that on 16 September, a pilot flying downwind of Redoubt reported smelling a strong sulfur dioxide odor. A week later, residents of a cabin near Wadell Lake (25 km NE) reported loud noises coming from the direction of Redoubt. During an overflight on 27 September, scientists observed several fractures and circular openings in the upper Drift glacier that had not been seen before. They also noted that fumaroles atop the 1968 and 1990 lava domes were more vigorous than when last observed in mid-August. A distinct hydrogen sulfide odor was also evident, though no sulfur dioxide was detected by onboard instrumentation. The seismic network at Redoubt did not detect any abnormal earthquake activity. The Volcano Alert Level remained Normal and the Aviation Color Code remained Green.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Based on visual observations, CVGHM reported that on 6 October a "smoke" plume from Soputan rose to an altitude of 2.8 km (9,200 ft) a.s.l. and incandescent material was ejected 25 m above the summit. The Alert level was raised from 2 to 3 (on a scale of 1-4). Residents and tourists were advised not go within a 6 km radius of the summit.

Analysis of satellite imagery by the Darwin VAAC indicated that on 6 October an ash plume rose to an altitude of 7.6 km (25,000 ft) a.s.l. and drifted W.

Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)

Based on information from JMA, the Tokyo VAAC reported that on 3 October an eruption plume from Sakura-jima rose to an altitude of 2.7 km (9,000 ft) a.s.l.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)

On 1 October, the Volcanic Alert Level for Anatahan was lowered to Normal and the Aviation Color Code to Green. Seismicity remained low and there were no recent reports of significant plumes.

Source: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program

Based on analysis of satellite imagery, the Darwin VAAC reported that during 3-4 October a low-level ash plume from Batu Tara drifted W and NW.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

SERNAGEOMIN reported that during 23-25 September, Chaitén continued to produce two vigorous gas-and-ash plumes from separate locations on the lava dome that rose to an altitude of 2.6 km (8,500 ft) a.s.l. During 27-28 September, activity increased and the two plumes rose to an altitude of 5.1 km (16,700 ft) a.s.l. Later in the day on 28 September, the plumes rose to an altitude of 4.1 km (13,500 ft) a.s.l. During an overflight on 30 September, scientists observed the small lagoon that remained in a depression in the N area of the basal "ring" that lies between the new lava dome and the caldera rim. The base of the S flank of the old lava dome was still evident; fumaroles were noted along the contact of the old and new domes. The new lava dome had grown higher and laterally from the NE flank until it touched the caldera rim. The Alert level remained Red.

Based on pilot observations, analysis of satellite imagery, and SIGMET reports, the Buenos Aires VAAC reported that during 3 and 5-8 October continuous ash plumes rose to altitudes of 2.4-3.5 km (8,000-11,500 ft) a.s.l. and drifted NE, ENE, and E.

Sources: Servicio Nacional de Geología y Minería (SERNAGEOMIN), Buenos Aires Volcanic Ash Advisory Center (VAAC)

KVERT reported that seismic activity at Karymsky was above background levels during 26 September-3 October. Possible explosions during 25-27 September and 1-2 October may have generated ash plumes to an altitude of 3.3 km (10,800 ft) a.s.l. Analysis of satellite imagery revealed a thermal anomaly in the crater on 29 September and cloudy conditions on the other days. The Level of Concern Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

HVO reported that during 1-7 October lava flowed SE through a tube system from underneath Kīlauea's Thanksgiving Eve Breakout (TEB) and rootless shield complex. Lava that reached the ocean entry generated a steam plume during much of the reporting period; a plume was absent during 4-6 October. The sulfur dioxide emission rate at Puʻu ʻŌʻō was 1,400 tonnes per day on 5 October, below the background rate as averaged over the past 25+ years.

During the reporting period, Kīlauea earthquakes were variously located beneath and to the S of the caldera, along the S-flank faults, and along the SW rift zone. Beneath Halemaʻumaʻu crater small earthquakes per day ranged from less than 40 to 100 (background is about 20-40), but were too small to be located more precisely. The vent in Halemaʻumaʻu crater continued to produce a predominantly white plume with occasional minor ash content that drifted mainly SW, but also in multiple other directions. Weak night-time incandescence was intermittently seen at the base of the plume. The sulfur dioxide emission rate was 900 and 1,100 tonnes per day on 3 and 5 October, respectively. The 2003-2007 rate average was 140 tonnes per day.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Based on analysis of satellite imagery, the Darwin VAAC reported that on 7 October ash plumes from Manam rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted NW.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

RVO reported that during 30 September-6 October ash plumes from Rabaul caldera's Tavurvur cone rose to altitudes of 1.7-2.7 km (5,600-8,900 ft) a.s.l. and drifted E, W, and NW. Ashfall was reported in areas downwind, including Rabaul town (3-5 km NW) and Namanula Hill (3 km W). Continuous incandescence from the vent was observed. Loud roaring noises were reported on 6 October.

Based on analysis of satellite imagery and information from RVO, the Darwin VAAC reported that on 7 October ash plumes rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted NW.

Sources: Rabaul Volcano Observatory (RVO), Darwin Volcanic Ash Advisory Centre (VAAC)

KVERT reported that seismic activity at Shiveluch was above background levels during 26 September-3 October. A large number of hot avalanches descended the lava dome and produced ash plumes that rose to altitudes of 4-5 km (13,100-16,400 ft) a.s.l. On 28 September, an ash plume that was visible on a web camera rose to an altitude of about 5 km (16,400 ft) a.s.l. Based on interpretations of seismic data, ash explosions likely occurred on 28 September and 1 October and generated ash plumes that rose to an altitude of 7.5 km (24,600 ft) a.s.l. Ashfall was reported in Klyuchi (about 45 km SW) on 1 October. Analysis of satellite imagery revealed a thermal anomaly on the lava dome during 28 September and 1-2 October. The Level of Concern Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

MVO reported that during 27 September-3 October, the W side of the Soufrière Hills lava dome continued to grow. Rockfalls were detected by the seismic network. The Hazard Level remained at 3.

Source: Montserrat Volcano Observatory (MVO)

Based on reports from JMA, the Tokyo VAAC reported explosions from Suwanose-jima on 1, 3, 7, and 8 October. Plumes rose straight up to an altitude of 2.1 km (7,000 ft) a.s.l. on 8 October. The altitude and direction of plumes were not reported for the other days.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)

According to news articles, access to Turrialba Volcano National Park was closed on 30 September because the S and SE winds, typical for the time of year, were blowing toxic gases to the area of the park where visitors enter and view the volcano.

Source: La Nacion

Based on SIGMET reports, the Buenos Aires VAAC reported that on 1 and 3 October ash plumes were continuously emitted from Ubinas and rose to altitudes of 5.5-6.1 km (18,000-20,000 ft) a.s.l. The plumes drifted N and NE.

Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)