All times are local unless otherwise stated.

Bezymianny (Russia) | 20 December-26 December 2006 | New Eruptive Activity Cite this Report
Bezymianny Eastern Kamchatka Volcanic Arc	The level of Concern Color Code for Bezymianny was raised from Yellow to Orange on 24 December due to an increase in incandescent avalanches, seismicity, and the intensity of a thermal anomaly at the summit. Within a few hours, a series of ash explosions and "ash avalanches" produced plumes that rose to altitudes of 6-10 km (19,700-32,800 ft) a.s.l. and drifted NE. The level of Concern Color Code was raised to Red. On 25 December, KVERT reported that seismic activity returned to background levels and explosive activity ceased. The level of Concern Color Code was returned to Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Sheveluch (Russia) | 20 December-26 December 2006 | New Eruptive Activity Cite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	According to observations, video data, and satellite imagery KVERT reported that ash plumes from Shiveluch rose to 10 km (32,800 ft) a.s.l. and drifted E on 16-17 and 20 December. Seismic activity was generally at background levels. Based on satellite imagery, the Tokyo VAAC reported that a possible eruption plume rose to an altitude of 9.1 km (30,000 ft) a.s.l. and drifted E on 24 December. Seismic and video data on 26 December indicated an ash plume above 10 km (32,800 ft.) a.s.l., extending 150 km NE in satellite imagery. The level of Concern Color Code was raised from Orange to Red. Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Kamchatkan Volcanic Eruption Response Team (KVERT)
Soufrière Hills (United Kingdom) | 20 December-26 December 2006 | New Eruptive Activity Cite this Report
Soufrière Hills Lesser Antilles Volcanic Arc	During 15-22 December, moderate lava-dome growth at Soufrière Hills continued and was focused on the SW part of the dome. Rockfalls and pyroclastic flows occurred on the S side of the dome and in the upper parts of both White's and Tuitt's Ghauts. Based on satellite imagery and pilot reports, the Washington VAAC reported that steam emissions with variable amounts of ash drifted W on 23 and 24 December. A pilot reported that an ash plume rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted W on 24 December. The MVO reported that the emissions originated from a vent on the W side of the dome. A small pyroclastic flow was visible NW in the upper reaches of Tyre's Ghaut and venting became more energetic. The alert level was raised to 4 (on a scale of 0-5). At night, incandescent rockfalls were visible from the NW and W. Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC)
Bagana (Papua New Guinea) | 20 December-26 December 2006 | Continuing Eruptive Activity Cite this Report
Bagana Bougainville Volcanic Arc	Geologic Summary. Bagana volcano, occupying a remote portion of central Bougainville Island, is one of Melanesia's youngest and most active volcanoes. Bagana is a massive symmetrical lava cone largely constructed by an accumulation of viscous andesitic lava flows. The entire lava cone could have been constructed in about 300 years at its present rate of lava production. Eruptive activity at Bagana is characterized by non-explosive effusion of viscous lava that maintains a small lava dome in the summit crater, although explosive activity occasionally producing pyroclastic flows also occurs. Lava flows form dramatic, freshly preserved tongue-shaped lobes up to 50-m-thick with prominent levees that descend the volcano's flanks on all sides. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Bulusan (Philippines) | 20 December-26 December 2006 | Continuing Eruptive Activity Cite this Report
Bulusan Eastern Philippine Volcanic Arc	According to a news report, a plume of gas and "white ash" was emitted from Bulusan on 22 December. Source: News Balita
Dukono (Indonesia) | 20 December-26 December 2006 | Continuing Eruptive Activity Cite this Report
Dukono Halmahera Volcanic Arc	The Darwin VAAC reported that a diffuse ash plume from Dukono was visible on satellite imagery on 22 December drifting SE. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Karymsky (Russia) | 20 December-26 December 2006 | Continuing Eruptive Activity Cite this Report
Karymsky Eastern Kamchatka Volcanic Arc	Seismic data from Karymsky were not available during 15-22 December. Based on ground and pilot observations, ash plumes rose to 7 km (23,000 ft) a.s.l. and drifted E and a thermal anomaly in the crater was detected on satellite imagery during the reporting period. The Level of Concern Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kīlauea (United States) | 20 December-26 December 2006 | Continuing Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	During 20-26 December, lava from Kīlauea continued to flow off of a lava delta into the ocean at the East Laeʻapuki and East Kaʻiliʻili entries. Incandescence on the pali was visible during the reporting period. Intermittent incandescence was seen coming from the East Pond and January vents, South Wall complex, and Drainhole vent in Puʻu ʻŌʻō's crater. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Langila (Papua New Guinea) | 20 December-26 December 2006 | Continuing Eruptive Activity Cite this Report
Langila Bismarck Volcanic Arc	The Darwin VAAC reported that diffuse ash-and-steam plumes from Langila were visible on satellite imagery on 22 December drifting WNW. Source: Rabaul Volcano Observatory (RVO)
Popocatépetl (Mexico) | 20 December-26 December 2006 | Continuing Eruptive Activity Cite this Report
Popocatépetl Trans-Mexican Volcanic Arc	Based on information from the Mexico City MWO, pilot reports, and satellite imagery, the Washington VAAC reported that an eruption plume from Popocatépetl rose to an altitude of 7.9 km (26,000 ft) a.s.l. and drifted E on 20 December. A hotspot was also visible on satellite imagery. Source: Washington Volcanic Ash Advisory Center (VAAC)
Sangay (Ecuador) | 20 December-26 December 2006 | Continuing Eruptive Activity Cite this Report
Sangay Northern Andean Volcanic Arc	Based on a pilot report, the Washington VAAC reported that an ash plume from Sangay rose to an altitude of 7.6 km (25,000 ft) a.s.l. on 23 December. Source: Washington Volcanic Ash Advisory Center (VAAC)
Semeru (Indonesia) | 20 December-26 December 2006 | Continuing Eruptive Activity Cite this Report
Semeru Sunda Volcanic Arc	The Darwin VAAC reported that a plume from Semeru was visible on satellite imagery on 21 December at an altitude of 4.3 (14,000 ft) a.s.l. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
St. Helens (United States) | 20 December-26 December 2006 | Continuing Eruptive Activity Cite this Report
St. Helens High Cascades Volcanic Arc	Data from deformation-monitoring instruments showed that during 20-26 December the lava dome at Mount St. Helens continued to grow. Seismicity continued at low levels, punctuated by earthquakes of M 1.5-2.5 and occasionally larger sizes. Source: US Geological Survey Cascades Volcano Observatory (CVO)
Suwanosejima (Japan) | 20 December-26 December 2006 | Continuing Eruptive Activity Cite this Report
Suwanosejima Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported that an eruption from Suwanose-jima occurred on 19 December. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Tungurahua (Ecuador) | 20 December-26 December 2006 | Continuing Eruptive Activity Cite this Report
Tungurahua Northern Andean Volcanic Arc	On 21 December, IG reported that lahars from Tungurahua traveled NW down the Mandur gorge resulting in a road closing and W down the Bilbao gorge. Gas-and-steam emissions produced small plumes on 22, 23, and 25 December. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Ulawun (Papua New Guinea) | 20 December-26 December 2006 | Continuing Eruptive Activity Cite this Report
Ulawun Bismarck Volcanic Arc	The Darwin VAAC reported that ash plumes from Ulawun were visible on satellite imagery on 21, 22, and 25 December drifting ENE, NW, and SW, respectively. Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Since the Weekly Volcanic Activity Report began in November 2000, there have been 22,859 individual reports over 1,335 weeks (average of 17 per week) on 351 different volcanoes.

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The RSS (Really Simple Syndication) feed is identical to the Weekly Volcanic Activity Report minus some features including the header information (latitude and longitude and summit elevation), the Geological Summary, and a link to the GVP volcano profile page. At the end of each report is a list of the sources used. Each report includes a link from the volcano's name back to the more complete information on the GVP website.

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Criteria

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 essentially continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Submarine activity is reported when information is available. 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.

Reports categorized as "Activity (New)" indicate eruptive activity that has occurred after at least 3 months of quiescence. Once a volcano is included in this section, updates will remain on that list unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Activity (Continuing)" section. Reports are included in the "Unrest" sections (New or Continuing) if the volcano is undergoing non-eruptive activity such as seismicity or deformation that is unusually high for that volcano or is increasing. The "Other" category includes non-eruptive and non-unrest reports, such as Alert Level decreases or previous ash deposits resuspended by winds. Reports through 2025 were only divided into "New Activity/Unrest" and "Continuing Activity", which have been automatically converted to the "Activity (New)" and "Activity (Continuing)" groups, respectively, without a review of content that might change the category to "Unrest" or "Other".

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 have the relevant information at the time.

Disclaimers

1. The Weekly Volcanic Activity Report is intended to provide timely information about global volcanism on a weekly basis. Consequently, the report is generated rapidly by summarizing volcanic reports from various sources, with little time for fact checking. The accuracy of the Weekly Volcanic Activity Report is dependent upon the quality of the volcanic activity reports we receive. Reports published in the Bulletin of the Global Volcanism Network are cover longer time periods and are more carefully reviewed, although all of the volcanoes discussed in the Weekly Volcanic Activity Report are not necessarily reported in the Bulletin. Reports are updated on the Weekly Volcanic Activity Report web page as they are received, therefore information may be included regarding events that occurred before the current report period.

2. Rapidly developing events lead to coverage that is often fragmentary. Volcanoes, their eruptions, and their plumes and associated atmospheric effects are complex phenomena that may require months to years of data analysis in order to create a comprehensive summary and interpretation of events.

3. Preliminary accounts sometimes contain exaggerations and "false alarms," and accordingly, this report may include some events ultimately found to be erroneous or misleading.

4. Many news agencies do not archive the articles they post on the Internet, and therefore the links to some sources may not be active. To obtain information about the cited articles that are no longer available on the Internet contact the source.

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Information presented on this website is considered public information and may be distributed or copied. Use of appropriate byline/photo/image credit is requested. We strongly recommend that USGS data be acquired directly from a USGS server and not through other sources that may change the data in some way. While USGS makes every effort to provide accurate and complete information, various data such as names, telephone numbers, etc. may change prior to updating. USGS welcomes suggestions on how to improve our home page and correct errors. USGS provides no warranty, expressed or implied, as to the accuracy, reliability or completeness of furnished data.

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