Activity for the week of 19 December-25 December 2007
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, notices of volcanic activity posted on these pages are preliminary and subject to change as events are studied in more detail. This is not a comprehensive list of all of Earth's volcanoes erupting during the week, but rather a summary of activity at volcanoes that meet criteria discussed in detail in the "Criteria and Disclaimers" section. Carefully reviewed, detailed reports on various volcanoes are published monthly in the Bulletin of the Global Volcanism Network.
New Activity / Unrest
| 11.984°N, 86.161°W
| Elevation 635 m
Based on observations of satellite imagery, the Washington VAAC reported that a small and diffuse plume from Masaya drifted SW on 24 December. Changes in seismic signals correlated with the emission. The plume possibly contained ash.
Source: Washington Volcanic Ash Advisory Center (VAAC)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
KVERT reported that seismic activity at Shiveluch was above background levels during 14-21 December. Based on seismic interpretation, a series of explosions during 18-19 December produced ash plumes that rose to altitudes of 6.5-8.7 km (21,300-29,000 ft) a.s.l. Ash plumes were observed on satellite imagery and drifted more than 130 km W on 18 December and 300 km to the NW and SW on 19 December. Ashfall was reported in the town of Klyuchi, about 30 km SW on 19 December. Based on visual observations, large pyroclastic flow deposits 8-9 km from the lava dome were noted on the S flank. On 20 December, KVERT reported that the Level of Concern Color Code was raised to Red. On 21 December, the Level of Concern Color Code was lowered back to Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| New Britain (Papua New Guinea)
| 5.05°S, 151.33°E
| Elevation 2334 m
Based on observations of satellite imagery, the Darwin VAAC reported that an ash-and-steam plume from Ulawun drifted W on 25 December.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Kyushu (Japan)
| 31.593°N, 130.657°E
| Elevation 1117 m
Based on information from JMA, the Tokyo VAAC reported that eruption plumes from Sakura-jima rose to an altitude of 2.7 km (9,000 ft) a.s.l. and drifted S during 23-24 December.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
| Mariana Islands (USA)
| 16.35°N, 145.67°E
| Elevation 790 m
Low-level tremor at Anatahan continued during 14-21 December. On 14 December, the Washington VAAC reported that a steam plume was visible on satellite data.The Volcanic Alert Level remained at Advisory and the Aviation Color Code remained at Yellow.
Source: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program
| Bougainville (Papua New Guinea)
| 6.137°S, 155.196°E
| Elevation 1855 m
Based on observations of satellite imagery and reports from the RVO, the Darwin VAAC reported that a plume from Bagana rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted SW on 21 December. An ash-and-steam plume was also visible on 26 December and drifted WSW.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Andaman Islands (India)
| 12.278°N, 93.858°E
| Elevation 354 m
Based on observations of satellite imagery, the Darwin VAAC reported that an ash plume from Barren Island rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted S on 23 December.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| 19.514°N, 103.62°W
| Elevation 3850 m
Steam and steam-and-ash plumes from Colima were observed rising to altitudes of 4.3-4.7 km (14,100-15,400 ft) a.s.l. during 20-23 and25 December. Plumes drifted N on 21 December.
Source: Gobierno del Estado de Colima
| 11.538°N, 85.622°W
| Elevation 1700 m
According to a news article, INETER reported that an explosion from Concepción on 20 December was followed by gas-and-ash plumes. Ashfall was reported in nearby communities.
Source: Associated Press
| 14.473°N, 90.88°W
| Elevation 3763 m
Based on observations of satellite imagery, the Washington VAAC reported that ash plumes from Fuego rose to an altitude of 5.2 km (17,000 ft) a.s.l. drifted SW on 21 December. Gas or ash plumes were seen on satellite imagery on 23 December and drifted W. According to CONRED, INSIVUMEH reported on 24 December that an ash plume drifted SW. CONRED reiterated that the Alert Level remained at Yellow.
Sources: Coordinadora Nacional para la Reducción de Desastres (CONRED), Washington Volcanic Ash Advisory Center (VAAC)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
Based on overflights and web camera views, HVO reported that fissure segment D from Kilauea's 21 July fissure eruption continued to feed perched lava ponds within a lava flow that frequently overflowed their channel edges during 19-25 December. Lava flowed from the base and top of the Thanksgiving Eve Breakout (TEB) shield and crust overturned in multiple lava ponds. An overflight on 20 December revealed that lava from fissure D built up two more shields SE of the TEB shield. A few small earthquakes were located beneath the summit and Halema'uma'u crater, and along S-flank fault.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Ol Doinyo Lengai
| 2.764°S, 35.914°E
| Elevation 2962 m
The Toulouse VAAC reported that an ash plume from Ol Doinyo Lengai was observed by visiting scientists on 20 December and rose to an unreported altitude.
Source: Toulouse Volcanic Ash Advisory Centre (VAAC)
| 14.382°N, 90.601°W
| Elevation 2569 m
According to CONRED, a 17 December INSIVUMEH report noted changes in Pacaya's behavior. On 19 December, CONRED issued a bulletin noting that INSIVUMEH reported observations of white and blue "smoke" plumes. The plumes rose to an altitude of 2.8 km (9,200 ft) a.s.l. and drifted S. Lava flows were unchanged from previous days. Based on these reports, CONRED raised the Alert Level to Yellow in surrounding communities.
Source: Coordinadora Nacional para la Reducción de Desastres (CONRED)
| 14.757°N, 91.552°W
| Elevation 3745 m
Based on observations of satellite imagery, the Washington VAAC reported that an ash plume from Santa María's Santiaguito lava dome complex rose to an altitude of 5.2 km (17,000 ft) a.s.l. and drifted SW on 21 December.
Source: Washington Volcanic Ash Advisory Center (VAAC)
| 16.72°N, 62.18°W
| Elevation 915 m
MVO reported that during 17-24 December the lava dome at Soufrière Hills changed very little, based on visual observations. Seismic activity was very low and low-level rockfall activity continued. Fumarolic activity on the N and E flanks of the dome continued. The Alert Level remained elevated at 4 (on a scale of 0-5).
Source: Montserrat Volcano Observatory (MVO)
| United States
| 46.2°N, 122.18°W
| Elevation 2549 m
Data from deformation-monitoring instruments indicated that during 19-25 December lava-dome growth at Mount St. Helens continued. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. Clouds occasionally inhibited visual observations.
Source: US Geological Survey Cascades Volcano Observatory (CVO)
| 1.467°S, 78.442°W
| Elevation 5023 m
IG reported that although visual observations were occasionally limited due to cloud cover, ash-and-steam and ash plumes from Tungurahua were observed and rose to altitudes of 6-8.5 km (19,700-28,000 ft) a.s.l. during 19-25 December. Plumes drifted SE, SW, and WNW. Ashfall was reported in areas to the SW, W, NW, and N. Roaring noises and "cannon shots" were heard almost daily and windows and floors vibrated on 19, 21, and 23-24 December. On 19, 22, and 23 December, incandescent blocks were seen rolling hundreds of m down the flanks. Sounds indicating rolling blocks on the flanks were reported during 20-22 December, but were not observed due to cloud cover.
According to news articles, nearly 1,200 people in Penipe were evacuated nightly by security and specific communities around the volcano remained at an Orange Alert level.
Sources: Associated Press, Instituto Geofísico-Escuela Politécnica Nacional (IG)
| 16.355°S, 70.903°W
| Elevation 5672 m
Based on pilot reports, the Buenos Aires VAAC reported that ash plumes from Ubinas rose to altitudes of 5.5-7 km (18,000-23,000 ft) a.s.l. and drifted NE and SW during 24-25 December.
Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
Criteria & Disclaimers
The Weekly Volcanic Activity Report does not necessarily include all volcanic activity that occurred on Earth during the week. More than a dozen volcanoes globally have displayed more-or-less continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Moreover, Earth's sea-floor volcanism is seldom reported even though in theory it represents the single most prolific source of erupted material. The Weekly Volcanic Activity Report summarizes volcanic activity that meets one or more of the following criteria:
- A volcano observatory raises or lowers the alert level at the volcano.
- A volcanic ash advisory has been released by a volcanic ash advisory center (VAAC) stating that an ash cloud has been produced from the volcano.
- A verifiable news report of new activity or a change in activity at the volcano has been issued.
- Observers have reported a significant change in volcanic activity. Such activity can include, but is not restricted to, pyroclastic flows, lahars, lava flows, dome collapse, or increased unrest.
Volcanoes are included in the "New Activity/Unrest" section of the Weekly Volcanic Activity Report if the activity occurs after at least 3 months of quiescence. Once a volcano is included in the "New Activity/Unrest" section, updates will remain in that section unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Continuing Activity" section. Volcanoes are also included in the "New Activity/Unrest" section if the volcano is undergoing a period of relatively high unrest, or increasing unrest. This is commonly equal to Alert Level Orange on a scale of Green, Yellow, Orange, Red, where Red is the highest alert. Or alert level 3 on a scale of 1-4 or 1-5.
It is important to note that volcanic activity meeting one or more of these criteria may occur during the week, but may not be included in the Weekly Volcanic Activity Report because we did not receive a report.
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