Activity for the week of 14 December-20 December 2005
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.
| United States
| 59.363°N, 153.43°W
| Elevation 1252 m
During 14-20 December, several small steam explosions occurred at Augustine and the smell of sulfur was reported by residents in a couple of villages E of the volcano. During an overflight on 12 December, AVO scientists saw profuse steaming from numerous fumaroles on the summit, emanating mainly from behind the 1986 lava dome. Several energetic fumaroles were also located ~200 m down the SE flank. A gas-and-steam plume extended ~74 km SE. Augustine remained at Concern Color Code Yellow.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
| Andaman Islands (India)
| 12.278°N, 93.858°E
| Elevation 354 m
An ash plume emitted from Barren Island was visible on satellite imagery on 19 and 20 December at a maximum height of ~3.7 km (12,000 ft a.s.l.).
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| 19.514°N, 103.62°W
| Elevation 3850 m
During 12-19 December, several small explosions occurred at Colima, producing ash plumes that reached ~5.2 km (17,000 ft) a.s.l. on 15 December. Explosions on 12 December resulted in small amounts of ash deposited in areas SW of the volcano.
Sources: Centro Universitario de Estudios e Investigaciones de Vulcanologia - Universidad de Colima, Washington Volcanic Ash Advisory Center (VAAC)
| 14.473°N, 90.88°W
| Elevation 3763 m
On 13 December, two lava flows from Fuego reached 200-300 m W and SW of the central crater. Small landslides of incandescent blocks spalled off of the lava flows.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
Seismicity at Karymsky during 9-16 December indicated that growth of the lava dome in the summit crater continued. Ash plumes were visible on satellite imagery on 9 and 10 December. Karymsky remained at Concern Color Code Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
During 15-20 December, lava from Kilauea continued to enter the sea at the East Lae`apuki area and surface lava flows were visible on the Pulama pali fault scarp. Background volcanic tremor was near normal levels at Kilauea's summit. Volcanic tremor reached moderate levels at Pu`u `O`o. Small amounts of deformation occurred at the volcano.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| 19.023°N, 98.622°W
| Elevation 5393 m
During 14-20 December, several emissions of gas, steam, and small amounts of ash occurred at Popocatépetl. Small explosions produced ash plumes to a height of ~2.5 km above the summit (or 26,000 ft a.s.l.).
Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
| El Salvador
| 13.853°N, 89.63°W
| Elevation 2381 m
During 14-20 December, seismicity at Santa Ana was above background levels. Small earthquakes occurred, which were interpreted as being associated with gas pulses. Gas emissions rose to low levels. The Alert Level remained at Red, the highest level, within a 5-km radius around the volcano's central crater.
Source: Servicio Nacional de Estudios Territoriales (SNET)
| 14.757°N, 91.552°W
| Elevation 3745 m
On 13 December, several weak-to-strong explosions occurred at Santa María's Santiaguito lava-dome complex, producing ash plumes to a maximum height of ~2.5 km above the volcano (or 20,600 ft a.s.l.) that mainly drifted SW. Avalanches of volcanic material spalled off of the fronts of active lava flows.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
| 16.72°N, 62.18°W
| Elevation 915 m
During 9-16 December, seismic and volcanic activity remained at elevated levels at Soufrière Hills. Images taken during the report period showed that the lava dome continued to grow. Growth occurred over a broad sector extending from the SW around to the NE, but was mostly focused towards the S and SW. Numerous small rockfalls traveled down the S, E, and NE flanks of the lava dome, adding to the talus in the upper reaches of the Tar River valley. The sulfur-dioxide flux averaged 489 metric tons per day.
Source: Montserrat Volcano Observatory (MVO)
| United States
| 46.2°N, 122.18°W
| Elevation 2549 m
Growth of the new lava dome inside the crater of Mount St. Helens continued during 14-20 December, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. There were no significant changes in seismicity or deformation during the report period. Small rockfalls continued from the growing lava dome, with larger ones producing ash plumes that were visible above the crater rim. Repeat images taken on 15 December from fixed cameras within the crater and at the crater rim showed the seventh lava spine to emerge during the current activity. It continued to push upward and southwestward from a source just S of the 1980-1986 dome. St Helens remained at Volcano Advisory (Alert Level 2); aviation color code Orange.
Source: US Geological Survey Cascades Volcano Observatory (CVO)
| 1.467°S, 78.442°W
| Elevation 5023 m
On 13 December, lahars were generated at Tungurahua that traveled down the Juive (NNW) and Achupashal (NW) gorges. On 14 December a steam-and-ash cloud rose ~1 km above the volcano (or 19,750 ft a.s.l.). On 17 December, lahars were generated in the NW and W zone of the volcano. There were reports of lahars to the W in the Chontapamba sector that blocked the Baños - Penipe highway, in the Salado sector where the volume of water in the Vazcún River increased by 70 percent, and in the Pampas sector.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
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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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