The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program. Updated by 2300 UTC every Wednesday, these notices are preliminary and subject to change as events are studied in more detail. This is not a comprehensive list of eruptions during the week, but rather a summary of activity that meet selected criteria. Carefully reviewed, detailed reports are published monthly in the Bulletin of the Global Volcanism Network. The World Organization of Volcano Observatories (WOVO) website (http://www.wovo.org/) lists the regional volcano observatories that have the most authoritative data for many of these events.
Fuego (Guatemala) - Report for 2 February-8 February 2011 - NEW
Wednesday, February 09, 2011 9:50 AM
INSIVUMEH reported that during 2-3 February Fuego produced 27 explosions with ash plumes that rose 300-500 m above the crater and drifted 7 km W and SW. The explosions generated shock waves detected as far away as 5 km W and SW, in Sangre de Cristo, Panimache I and II, and Morelia. Block avalanches descended the Santa Teresa, Taniluyá, Cenizas, and Trinidad drainages to the SW. During 6-8 February explosions produced ash plumes that rose 500 m above the crater and drifted W and SW. At night incandescence was observed emanating from the crater and explosions sometimes ejected incandescent material 100 m above the crater rim.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Galeras (Colombia) - Report for 2 February-8 February 2011 - NEW
Wednesday, February 09, 2011 9:50 AM
On 8 February, INGEOMINAS reported that "tornillo-type" earthquakes from Galeras had not been detected since 5 February. Seismic levels continued to fluctuate. On 6 February an overflight revealed that gas emissions had increased in comparison to the previous week, forming plumes that drifted NW. The Alert Level was lowered to III (Yellow; "changes in the behavior of volcanic activity").
Source: Instituto Colombiano de Geología y Minería (INGEOMINAS)
Kirishima (Japan) - Report for 2 February-8 February 2011 - NEW
Wednesday, February 09, 2011 9:50 AM
According to a news article, explosions on 2 February from Shinmoe-dake (Shinmoe peak), a stratovolcano of the Kirishima volcano group, disrupted flights to Tokyo. The article also noted that JMA widened the restricted zone to a 4-km-radius around the crater. About 600 people from Miyazaki (55 km E) had evacuated. Based on reports from JMA, analyses of satellite imagery, and pilot observations, the Tokyo VAAC reported that during 2-8 February ash plumes rose to altitudes of 1.5-4.6 km (5,000-15,000 ft) a.s.l. and drifted SE. On 3 February, a pilot noted that an ash plume rose to an altitude of 9.1 km (30,000 ft) a.s.l. and drifted NE. According to JMA, scientists observed Shinmoe-dake during an overflight on 6 February and noted that the lava dome was about 600 m in diameter, similar to observations from four days prior. Gas plumes rose from the edges of the lava dome, from multiple areas on the E side of the dome, and from a central vent. Ash plumes rose 1.5 km above the crater rim and drifted SE.
Sources: Earthquake Research Institute, Japan Meteorological Agency, Tokyo Volcanic Ash Advisory Center (VAAC), Asia One
Nyiragongo (DR Congo) - Report for 2 February-8 February 2011 - NEW
Wednesday, February 09, 2011 9:50 AM
The Toulouse VAAC reported that during 4-5 February diffuse plumes, likely composed primarily of sulfur dioxide gas, were observed in satellite imagery.
Source: Toulouse Volcanic Ash Advisory Center (VAAC)
Bezymianny (Russia) - Report for 2 February-8 February 2011
Wednesday, February 09, 2011 9:50 AM
KVERT reported that during 28 January-4 February seismicity from Bezymianny did not exceed background levels, however weak volcanic earthquakes were detected. A thermal anomaly over the volcano was observed daily in satellite imagery. Gas and steam activity was observed during 30-31 January and 1-3 February; cloud cover prevented observations on the other days. The Aviation Color Code level remained at Yellow.Based on information from the Yelizovo Airport (UHPP), the Washington VAAC reported that on 4 February an ash plume rose to an altitude of 4.6 km (15,000 ft) a.s.l. drifted NE.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Washington Volcanic Ash Advisory Center (VAAC)
Karymsky (Russia) - Report for 2 February-8 February 2011
Wednesday, February 09, 2011 9:50 AM
KVERT reported that moderate seismic activity was detected at Karymsky during 28 January-4 February. Seismic data showed that possible ash plumes rose to an altitude of 4.7 km (15,400 ft) a.s.l. Satellite imagery showed a daily thermal anomaly, and ash plumes were observed drifting 120 km E during 30-31 January and 1-2 February. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea (United States) - Report for 2 February-8 February 2011
Wednesday, February 09, 2011 9:50 AM
During 2-8 February, activity continued from the summit caldera and east rift zone. At the summit caldera, the level of the lava-pool surface in the deep pit within Halema'uma'u crater circulated and remained mostly stable at approximately 100 m below the crater floor, periodically rising or falling. Nighttime incandescence was visible from the Jaggar Museum on the NW caldera rim. A plume from the vent that drifted mostly SW, W, and N deposited ash and fresh spatter nearby.At the east rift zone, lava that broke out of the Quarry tube in a saddle between two rootless shields around 610 m elevation continued to advance both E and W, producing scattered surface flows. At the lowest elevation of the E branch, lava advanced along Highway 130 near Kalapana, periodically burning vegetation, and to the S towards the coast. On 4 February incandescence from the TEB vent and upper rootless shields visible on the web camera was later confirmed to be from spatter and lava flows. Lava continued to issue from each location during 5-8 February. Multiple small ocean entries were active on the W part of the Puhi-o-Kalaikini lava delta until 7 or 8 February. In Pu'u 'O'o crater, incandescence emanated from the fuming vent in the E wall of the crater, and spatter and lava flows were produced from a cone on the N portion of the crater floor. On 7 February activity significantly increased; lava flowed from several vents including the vent on the E wall and multiple spatter cones on the N and NW areas of the floor.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Kizimen (Russia) - Report for 2 February-8 February 2011
Wednesday, February 09, 2011 9:50 AM
KVERT reported that during 28 January-4 February seismicity from Kizimen was high but variable, and many shallow volcanic earthquakes as well as volcanic tremor continued to be detected. Satellite images showed a bright thermal anomaly over the volcano daily. During 27-31 January and 1-3 February ash plumes rose to an altitude of 6.1 km (16,400 ft) a.s.l. and drifted more than 430 km E. The Aviation Color Code remained at Orange.Based on information from KEMSD, the Tokyo VAAC reported that on 8 February an eruption produced a plume that rose to an altitude of 4 km (13,000 ft) a.s.l.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
Popocatépetl (México) - Report for 2 February-8 February 2011
Wednesday, February 09, 2011 9:50 AM
CENAPRED noted that steam-and-gas emissions rose from Popocatépetl during 2-8 February.
Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Sakura-jima (Japan) - Report for 2 February-8 February 2011
Wednesday, February 09, 2011 9:50 AM
Based on information from JMA, the Tokyo VAAC reported that during 1-8 February explosions from Sakura-jima produced plumes that rose to altitudes of 1.2-3.4 km (4,000-11,000 ft) a.s.l. and drifted SE, E, and NE. During 3-4 and 7 February, pilots reported that ash plumes rose to altitudes of 2.4-3 km (8,000-10,000 ft) a.s.l. According to a news article, an eruption on 8 February produced a gas-and-ash plume that rose 2 km. A large amount of ashfall prompted local authorities to temporarily ban residents from driving near the area.
Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Arirang
Santa María (Guatemala) - Report for 2 February-8 February 2011
Wednesday, February 09, 2011 9:50 AM
Based on analyses of satellite imagery, the Washington VAAC reported that on 2 February an ash plume from Santa María's Santiaguito lava dome complex drifted less than 30 km SW and quickly dissipated. INSIVUMEH reported that during 2-3 February explosions produced ash plumes that rose 300 m above Caliente dome and drifted S and SW. On 4 February the VAAC noted that an ash plume was detected in satellite imagery. INSIVUMEH notices also stated that fumarolic plumes rose as high as 150 m above the dome during 2-3 and 6-7 February and drifted SE and W. Several landslides on the flanks occurred during 6-7 February. Explosions during 7-8 February produced ash plumes that rose 400 m above the dome and drifted SE.
Sources: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH), Washington Volcanic Ash Advisory Center (VAAC)
Shiveluch (Russia) - Report for 2 February-8 February 2011
Wednesday, February 09, 2011 9:50 AM
KVERT reported that moderate seismic activity was detected at Shiveluch during 28 January-4 February and many volcanic earthquakes were detected. A thermal anomaly over the lava dome was observed in satellite imagery. Gas and steam activity was occasionally observed. Ash plumes were seen rising to an altitude of 6 km (19,700 ft) a.s.l. on 30 January and 3 February. Ash plumes observed in satellite imagery drifted 120 km NE during 31 Janaury-1 February, and rose to altitudes of 6-8 km (19,700-26,200 ft) a.s.l. on 1 February. The Aviation Color Code remained at Orange.The Tokyo VAAC reported that on 8 February a possible eruption detected in satellite imagery produced a plume that rose to an altitude of 4 km (13,000 ft) a.s.l. and drifted E. Subsequent notices that day stated that ash had dissipated.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
Suwanose-jima (Japan) - Report for 2 February-8 February 2011
Wednesday, February 09, 2011 9:50 AM
Based on a pilot observation, the Tokyo VAAC reported that on 5 February an ash plume from Suwanose-jima rose to an altitude of 0.7 km (2,000 ft) a.s.l. and drifted S. Explosions during 5-7 February were noted by JMA.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Tengger Caldera (Indonesia) - Report for 2 February-8 February 2011
Wednesday, February 09, 2011 9:50 AM
CVGHM reported that on 5 February volcanic bombs ejected from Tengger Caldera's Bromo cone were found 1.2-1.4 km from the crater rim. During 5-8 February gray-to-brown ash plumes rose 400-800 m above the crater and drifted ENE. Incandescent material was ejected 200-300 m above the crater and landed as far as 500 m away. Roaring and booming noises were noted. Ash fell at the Bromo observation post, and in nearby villages including Ngadirejo (10 km WNW), Sukapura (14 km NE), and Sumber (18 km E). High-amplitude seismicity and volcanic tremor were detected. Deformation measurements had remained stable since 31 December 2010. The Alert Level remained at 3 (on a scale of 1-4). Residents and tourists were not permitted within a 2-km-radius of the active crater.
Source: Center of Volcanology and Geological Hazard Mitigation (CVGHM)
Villarrica (Chile) - Report for 2 February-8 February 2011
Wednesday, February 09, 2011 9:50 AM
Based on web camera views, the Buenos Aires VAAC reported that on 7 February diffuse gas-and-steam plumes rose from Villarrica and quickly dissipated.
Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
No comments:
Post a Comment