All times are local unless otherwise stated.

Tengger Caldera (Indonesia) | 20 December-26 December 2000 | New Eruptive Activity Cite this Report
Tengger Caldera Sunda Volcanic Arc	The VSI reported that during 12-18 December explosion and tremor activity at the volcano increased in comparison to the previous week. Minor explosions sent ash to 500-600 m above the crater rim. In addition, continuous tremor and a large number of explosion earthquakes (2,375) were recorded. The volcano remained at Alert Level 2 (ranging from 1 to 4). Tengger caldera has been active for approximately one month; therefore any further Tengger activity will be reported in the "Continuous Activity" section. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Etna (Italy) | 20 December-26 December 2000 | Continuing Eruptive Activity Cite this Report
Etna Sicily Volcanic Province	Volcanic activity at Etna was low during December, with low gas emission at the SE Crater throughout the month and a few isolated Strombolian events at the Bocca Nuova crater in mid-December. Sources: Sezione di Catania - Osservatorio Etneo (INGV), Italy's Volcanoes
Karangetang (Indonesia) | 20 December-26 December 2000 | Continuing Eruptive Activity Cite this Report
Karangetang Sangihe Volcanic Arc	The VSI reported that during 12-18 December, activity increased at Karangetang in comparison to the previous week. A thin plume continued to be emitted from the main crater and Crater II, but it rose higher than last week: up to 150 m above the summit. A "red flame," possibly indicating illumination of the plume by lava fountaining or incandescent material at the summit, was observed rising up to 75 m above the summit. Overall seismic activity decreased in comparison to the previous week. The volcano remained at Alert Level 2 (ranging from 1 to 4). Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Karymsky (Russia) | 20 December-26 December 2000 | Continuing Eruptive Activity Cite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that seismic activity was at background levels at Karymsky until 0905 to 0915 on 20 December when shallow earthquakes registered under the volcano were accompanied by short-lived explosions. At 2150 the same day, a pilot confirmed the presence of ash at the summit of the volcano and mud traces from melting snow on the edifice slopes. On 21 and 22 December (the end of KVERT's report period) seismicity was above background levels. The Concern Color Code was raised from Green to Yellow. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kīlauea (United States) | 20 December-26 December 2000 | Continuing Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	During the week surface lava flows continued to flow down Pūlama pali, with the lava flow front more than 2 km inland from the sea. Overall, seismic tremor was weak to moderate near Puʻu ʻŌʻō and was weak beneath Kīlauea caldera. The tiltmeters at Kīlauea's summit and along the east rift zone showed flat signals. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Popocatépetl (Mexico) | 20 December-26 December 2000 | Continuing Eruptive Activity Cite this Report
Popocatépetl Trans-Mexican Volcanic Arc	Volcanic activity at Popocatépetl decreased in comparison to last week. The Washington VAAC reported that during 21 to 25 December there were intermittent emissions of mostly steam. In addition, several small-to-moderate explosive events occurred during the week; at 1555 on 24 December ash was erupted to ~9 km a.s.l. and then blown to the E; at 1045 on 25 December ash was erupted to between 5.5 and 7.6 km a.s.l., blown to the NE, and deposited less than 5 km from the summit; and moderate exhalations occurred at 0111 and 0631 on 27 December that sent ash up to 7.6 and 9.8 km, respectively. On 26 December CENAPRED reported that beginning on 24 December the volcano entered a new phase of activity. Moderate explosions were expected to continue for several days or weeks until the lava dome in the summit crater is destroyed. CENAPRED scientists determined that there was decreased likelihood of a large eruption. Most of the 41,000 residents near the volcano, who were evacuated beginning on 15 December, were permitted to return to their homes. The evacuees were warned to remain alert for further activity. The director of CENAPRED, Robert Quaas, told journalists at a press conference on 26 December that, "The volcano could continue to launch incandescent fragments as far as 5 km and could provoke a moderate rain of cooled fragments as far away as 10 km, because of events related to the destruction of the lava dome." The volcano remained at Alert Level Yellow Phase III, but the restricted area was reduced from 13 to 12 km. For more information about the present state of the volcano and the return of evacuees to their homes refer to CENAPRED's 26 December Bulletin. Sources: Washington Volcanic Ash Advisory Center (VAAC), Centro Nacional de Prevencion de Desastres (CENAPRED), Notimex, Reuters, Associated Press
Sheveluch (Russia) | 20 December-26 December 2000 | Continuing Eruptive Activity Cite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that much like the previous week, the character of the volcanic activity did not change during 15-22 December. On 15 and 20 December weak seismicity was registered at the volcano and at 2105 on 15 December a seismic event was likely accompanied by a gas-and-ash explosion that sent a cloud to an inferred height of 2 km a.s.l. On 20 December a gas-and-steam plume rose 200-300 m above the crater. KVERT lowered the Concern Color Code from Yellow to Green. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Soufrière Hills (United Kingdom) | 20 December-26 December 2000 | Continuing Eruptive Activity Cite this Report
Soufrière Hills Lesser Antilles Volcanic Arc	The Washington VAAC reported that throughout the week low-level (up to ~2 km) ash clouds that were produced by rockfalls, and periodic hot spot activity were visible on GOES-8 imagery. Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC)
Tungurahua (Ecuador) | 20 December-26 December 2000 | Continuing Eruptive Activity Cite this Report
Tungurahua Northern Andean Volcanic Arc	The IG reported that on 21 December an ash cloud was observed over the summit of Tungurahua at a height of ~5.8 km a.s.l. According to the Washington VAAC, the ash was not visible on GOES-8 imagery. Sources: Washington Volcanic Ash Advisory Center (VAAC), Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

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.

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