Based on information from IG, the Washington VAAC reported that on 4 October an ash plume from Reventador drifted W. Ash was not seen in satellite imagery, although meteorological clouds were present. An occasional thermal anomaly was seen, however.
RVO reported that during 25 September-1 October gray ash plumes from Rabaul caldera's Tavurvur cone rose 2 km above the crater. Ashfall was reported in Rabaul town (3-5 km NW) and surrounding areas. Occasionally, incandescence from the summit crater was seen at night and incandescent lava fragments were ejected from the crater.
CENAPRED reported that during 3-6 October emissions of steam and gas from Popocatépetl contained slight amounts of ash.
Based on analyses of satellite imagery, the Darwin VAAC reported that on 30 September an ash plume from Langila drifted 260 km NW at an altitude of 4.3 km (14,000 ft) a.s.l. On 5 October, a diffuse ash plume rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted 185 km N.
During 30 September-6 October, HVO reported that lava flowed SE from underneath Kilauea's Thanksgiving Eve Breakout (TEB) and rootless shield complex through a lava tube system, reaching the Waikupanaha ocean entry. Thermal anomalies detected in satellite images revealed active surface lava flows on top of the pali. The vent in Halema'uma'u crater continued to produce a diffuse white plume that drifted SW.
Based on analyses of satellite imagery, the Darwin VAAC reported that on 2 October an ash plume from Dukono rose to an altitude of 2.7 km (9,000 ft) a.s.l. and drifted 75 km NE. On 6 October, an ash plume rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted 55 km NE.
Based on analyses of satellite imagery, the Darwin VAAC reported that during 30 September-3 October and 5-6 October ash plumes from Batu Tara rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 25-75 km W, NW, and N.
MVO reported that a short volcano-tectonic earthquake swarm from Soufrière Hills lava dome was detected at 2100 on 4 October. A period of tremor and vigorous ash venting followed about an hour later. The resulting ash plume drifted WNW across the island and out to sea, causing ashfall in Old Towne and Olveston.
Wed, 30 Sep 2009, 06:00
KVERT reported that during 25 September-2 October seismic activity from Shiveluch was above background levels. Analyses of satellite imagery revealed a large daily thermal anomaly over the lava dome. Fumarolic activity was occasionally seen.
Read allWed, 30 Sep 2009, 06:00
KVERT reported that during 25 September-2 October seismic activity from Kliuchevskoi was slightly above background levels and weak tremor was detected. Satellite imagery revealed a weak thermal anomaly over the volcano. Strombolian activity ejected tephra 70-100 m above the crater during 28-30 September.
Read allWed, 30 Sep 2009, 06:00
KVERT reported that seismic activity at Karymsky was elevated above background levels during 25 September-2 October and possibly indicated weak ash explosions. Analyses of satellite imagery revealed a weak thermal anomaly over the lava dome on 28 September; cloud cover prevented observations on the other days. Scientists saw fumarolic activity during an overflight on 1 October.
Read allWed, 30 Sep 2009, 06:00
According to news articles from 2 October, increased seismicity at Gaua was detected during the previous two weeks. Villagers living nearby reported ashfall and sulfur odors. Both villagers and a pilot flying past Gaua heard explosions. The Alert Level was raised to 1 (on a scale of 0-5).
Read allWed, 30 Sep 2009, 06:00
An explosive eruption from Galeras on 30 September prompted INGEOMINAS to raise the Alert Level to I (Red; "imminent eruption or in progress"). National Park personnel reported two explosions and incandescent material ejected from the area of the active cone. An ash plume rose to an approximate altitude of 12.3 km (40,400 ft) a.s.l. and drifted E, then N.
Read allWed, 30 Sep 2009, 06:00
A small explosive eruption of Cleveland on 2 October prompted AVO to raise the Volcano Alert Level to Watch and the Aviation Color Code to Orange. A detached ash cloud at estimated altitudes of 4.6-6.1 km (15,000-20,000 ft) a.s.l. was seen on satellite imagery; the cloud drifted about 600 km NE and dispersed over the Bering Sea.
Read allWed, 30 Sep 2009, 06:00
During 16-30 September, SERNAGEOMIN reported that Chaitén's Domo Nuevo 1 (Phase I) and Domo Nuevo 2 (Phase II) lava-dome complex continued to grow, generating block-and-ash flows from the collapse of unstable slopes. Gas plumes continued to rise from the complex and were visible using the web camera, S of the volcano.
Read allWed, 30 Sep 2009, 06:00
Based on information from JMA and pilot observations, the Tokyo VAAC reported that explosions from Sakura-jima during 30 September-6 October produced plumes that rose to altitudes of 1.8-4.3 km (6,000-14,000 ft) a.s.l. Plumes occasionally drifted E, N, and W.
Read allWed, 23 Sep 2009, 06:00
On 25 September, scientists from OVSICORI-UNA reported results from three field trips to Turrialba to inspect new fissures and to assess the impact of gases on surrounding areas. Winds carrying toxic gases 10 km SW, to the S side of Irazú volcano, caused trees to exhibit mild burns to a greater degree than effects from the previous year. Vegetation within a 4-km-radius on the W, NW, and E flanks was also burned more severely that previously noted.
Read allWed, 23 Sep 2009, 06:00
On 29 September, AVO reported that seismic activity from Redoubt, along with volcanic gas output, ground deformation, lava dome temperatures, and outward signs of lava dome instability, have been declining during the previous several months. The Volcanic Alert Level was lowered to Normal and the Aviation Color Code was lowered to Green.
Read allWed, 23 Sep 2009, 06:00
RVO reported that during 18-24 September gray ash plumes from Rabaul caldera's Tavurvur cone rose 1.5 km above the crater. Ashfall was reported in Rabaul town (3-5 km NW) and surrounding areas. Occasionally, incandescence from the summit crater was seen at night, and incandescent lava fragments were ejected from the crater.
Read allWed, 23 Sep 2009, 06:00
Based on analyses of satellite imagery, the Darwin VAAC reported that on 29 September an ash plume from Langila rose to altitudes of 2.4-4.3 km (8,000-14,000 ft) a.s.l. and drifted 75-220 km NW.
Read allWed, 23 Sep 2009, 06:00
During 23-27 September, HVO reported that lava flowed SE from underneath Kilauea's Thanksgiving Eve Breakout (TEB) and rootless shield complex through a lava tube system, reaching the Waikupanaha ocean entry. Lava was not seen entering the ocean on 28 and 29 September. Visual observations and thermal anomalies detected in satellite images revealed active surface lava flows on most days.
Read allWed, 23 Sep 2009, 06:00
Based on analyses of satellite imagery, the Darwin VAAC reported that on 24 September an ash plume from Dukono rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 65 km NW.
Read allWed, 23 Sep 2009, 06:00
Based on web camera views and analyses of satellite imagery, the Buenos Aires VAAC reported that on 28 September a diffuse ash plume from Chaitén's Domo Nuevo 1 and Domo Nuevo 2 lava-dome complex, possibly mixed with steam and gas, rose to an altitude of 2.4 km (8,000 ft) a.s.l. The plume drifted less than 40 km W and SW.
Read allWed, 23 Sep 2009, 06:00
Based on analyses of satellite imagery, the Darwin VAAC reported that during 23-29 September ash plumes from Batu Tara rose to altitudes of 1.5-2.4 km (5,000-8,000 ft) a.s.l. and drifted 15-75 km W and NW.
Read allWed, 23 Sep 2009, 06:00
Based on information from JMA, the Tokyo VAAC reported that explosions from Sakura-jima during 23, 25, and 27-29 September produced plumes that rose to altitudes of 1.8-2.7 km (6,000-9,000 ft) a.s.l. and drifted SW, W, and NW.
Read allWed, 23 Sep 2009, 06:00
KVERT reported that during 18-25 September seismic activity from Shiveluch was above background levels. Analyses of satellite imagery revealed a large daily thermal anomaly over the lava dome. Based on interpretations of seismic data, ash plumes possibly rose to an altitude of 5.2 km (17,100 ft) a.s.l.
Read allWed, 23 Sep 2009, 06:00
KVERT reported that on 17 and 22 September a weak thermal anomaly over Karymsky was detected in satellite imagery. During 19-23 September seismic activity was above background levels; analyses of the seismic data indicated that ash plumes possibly rose to an altitude of 2 km (6,600 ft) a.s.l. during 21-22 September, and to an altitude of 4.5 km (14,800 ft) a.s.l. on 23 September.
Read allWed, 23 Sep 2009, 06:00
CVGHM reported that on 26 September a "thunderous" noise from Dieng was heard from 2 km away. The next day, a phreatic eruption from an unspecified crater ejected mud as far away as 140 m S. The deposits were as thick as 10 cm near the vent and 1 cm near the farthest point.
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