All times are local unless otherwise stated.

Suwanosejima (Japan) | 10 December-16 December 2003 | New Eruptive Activity Cite this Report
Suwanosejima Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported that an explosion at Suwanose-jima on 15 December at 1946 produced a plume to an unknown height. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Colima (Mexico) | 10 December-16 December 2003 | Continuing Eruptive Activity Cite this Report
Colima Trans-Mexican Volcanic Arc	As of 12 December there was an average of three explosions per day at Colima that rose 2-3 km above the crater. Most of the ash from these explosions drifted ENE. A significant explosion on 11 December at 0258 sent volcanic bombs down the NE and N flanks and deposited ash in the city of Ciudad Guzmán, 25 km to the NE. According to the Washington VAAC, ash from an explosion on 14 December was visible on satellite imagery at a height of ~6 km a.s.l. Sources: Washington Volcanic Ash Advisory Center (VAAC), Centro Universitario de Estudios Vulcanológicos (CUEV) - Universidad de Colima
Dukono (Indonesia) | 10 December-16 December 2003 | Continuing Eruptive Activity Cite this Report
Dukono Halmahera Volcanic Arc	During 10-16 December, thin ash plumes from Dukono were sometimes visible on satellite imagery extending to a maximum distance of ~90 km E and NE. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Fuego (Guatemala) | 10 December-16 December 2003 | Continuing Eruptive Activity Cite this Report
Fuego Central America Volcanic Arc	During 10-16 December, weak explosions at Fuego continued to produce ash clouds that rose 200-1,000 m above the volcano. Explosions and avalanches on 16 December sent volcanic material W and SW towards Taniluya and Santa Teresa ravines. Civil Aeronautics recommended that airplanes avoid the area near the volcano due to ash in the atmosphere. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Kīlauea (United States) | 10 December-16 December 2003 | Continuing Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	During 10-16 December, eruptive activity continued at Kīlauea's Puʻu ʻŌʻō vent. Various vents within Puʻu ʻŌʻō were occasionally active and new lava flows covered parts of the crater floor. No surface lava flows were visible on the coastal flat or Pūlama pali. During 15-16 December, only steady weak tremor was recorded at Kīlauea's summit, tremor at Puʻu ʻŌʻō was at moderate levels, and slight deformation occurred. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Nyamulagira (DR Congo) | 10 December-16 December 2003 | Continuing Eruptive Activity Cite this Report
Nyamulagira Albertine Rift Volcanic Province	During December, seismicity continued at Nyamuragira and may have increased. Source: Observatoire Volcanologique de Goma (OVG)
Nyiragongo (DR Congo) | 10 December-16 December 2003 | Continuing Eruptive Activity Cite this Report
Nyiragongo Albertine Rift Volcanic Province	GVO reported that in December activity at Nyiragongo remained at relatively low levels, with the constant presence of an active lava lake inside the crater. The Alert Level remained at Yellow. Source: Observatoire Volcanologique de Goma (OVG)
Piton de la Fournaise (France) | 10 December-16 December 2003 | Continuing Eruptive Activity Cite this Report
Piton de la Fournaise Reunion Hotspot Volcano Group	As of 16 December, significant seismicity continued at Piton de la Fournaise. Hikers were only permitted limited access to the volcano due to the possibility of further volcanic activity. Sources: Clicanoo - Le Journal de l'Ile de la Reunion, Fournaise.info
Santa María (Guatemala) | 10 December-16 December 2003 | Continuing Eruptive Activity Cite this Report
Santa María Central America Volcanic Arc	Weak-to-moderate explosions continued at Santa Maria's Santiaguito lava dome during 10-16 December. On 10 December ash mainly drifted SE toward the areas of Sana María de Jesús and las Majadas. Avalanches traveled to the S and SW from the fronts of lava flows. According to the Washington VAAC, on 12 December ash clouds were visible on satellite imagery at a height of ~4.5 km drifting SW. Sources: Washington Volcanic Ash Advisory Center (VAAC), Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Soufrière Hills (United Kingdom) | 10 December-16 December 2003 | Continuing Eruptive Activity Cite this Report
Soufrière Hills Lesser Antilles Volcanic Arc	Volcanic activity at Soufrière Hills was at low levels during 5-12 December, with low counts of all types of seismic signals. Visual observations confirmed that no new lava-dome growth occurred in the crater since July 2003, although some old lava-dome material from the crater walls had slumped and wall rocks had degraded due to steaming. Sulfur-dioxide flux measurements varied during the week from 800-900 tons per day at the beginning of the report period to 300-500 tons per day towards the end of the week. Source: Montserrat Volcano Observatory (MVO)
Stromboli (Italy) | 10 December-16 December 2003 | Continuing Eruptive Activity Cite this Report
Stromboli Aeolian Volcanic Arc	The Stromboli Web video camera showed a small explosion on 10 December that produced a plume to a height of ~1 km above the volcano. No ash was visible on satellite imagery. Source: Toulouse Volcanic Ash Advisory Centre (VAAC)
Tungurahua (Ecuador) | 10 December-16 December 2003 | Continuing Eruptive Activity Cite this Report
Tungurahua Northern Andean Volcanic Arc	During 11-16 December, volcanic activity remained relatively high at Tungurahua with several explosions producing ash-and-gas plumes to a maximum height of 4 km. There were also many long-period earthquakes that were associated with near-constant gas-and-ash emissions. Explosions on 11 December deposited ash in the towns of Quero, Santa Fe de Galán, and lesser amounts in Bilbao. According to the Washington VAAC, ash-and-gas plumes were visible on satellite imagery several times during the report week. Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN), Washington Volcanic Ash Advisory Center (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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