All times are local unless otherwise stated.

Galeras (Colombia) | 18 November-24 November 2009 | New Eruptive Activity Cite this Report
Galeras Northern Andean Volcanic Arc	An explosive eruption from Galeras detected by the seismic network on 20 November prompted INGEOMINAS to raise the Alert Level to I (Red; "imminent eruption or in progress"). Residents reported five explosions, sound waves, and incandescence from multiple areas in the crater. Plume modelling from the Washington VAAC suggested that the resulting ash plume may have risen as high as 14.3 km (46,900 ft) a.s.l. and drifted N. Ashfall was reported in areas 10 km E, N, and NNW. Seismicity increased after the eruption and then gradually decreased. On 21 November, INGEOMINAS lowered the Alert Level to II (Orange; "probable eruption in term of days or weeks"). According to news articles, 900-1,000 people out of about 9,000 ordered to evacuate went to shelters. Sources: Agence France-Presse (AFP), Servicio Geológico Colombiano (SGC)
Sarychev Peak (Russia) | 18 November-24 November 2009 | New Eruptive Activity Cite this Report
Sarychev Peak Kuril Volcanic Arc	SVERT reported that a thermal anomaly on Sarychev Peak was detected by satellite on 21 November. Source: Sakhalin Volcanic Eruption Response Team (SVERT)
Aira (Japan) | 18 November-24 November 2009 | Continuing Eruptive Activity Cite this Report
Aira Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported that explosions from Sakura-jima on 18 and 23 November produced plumes that rose to altitudes of 2.1-2.7 km (7,000-9,000 ft) a.s.l. and drifted S and E. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Batu Tara (Indonesia) | 18 November-24 November 2009 | Continuing Eruptive Activity Cite this Report
Batu Tara Sunda Volcanic Arc	Based on analyses of satellite imagery, the Darwin VAAC reported that on 24 November an ash plume from Batu Tara rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 90 km NW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Chaitén (Chile) | 18 November-24 November 2009 | Continuing Eruptive Activity Cite this Report
Chaitén Southern Andean Volcanic Arc	Based on web camera views, the Buenos Aires VAAC reported that on 23 November a gas plume from Chaitén's lava-dome complex rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted SSE. Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
Karymsky (Russia) | 18 November-24 November 2009 | Continuing Eruptive Activity Cite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that seismic activity at Karymsky was above background levels on 12, 14, and 16 November; data were not available on the other days during 13-20 November due to technical reasons. Elevated seismicity possibly indicated that ash plumes rose to an altitude of 3 km (9,900 ft) a.s.l. Analyses of satellite imagery revealed a daily thermal anomaly and ash plumes that drifted 130 km E during 12-14 and 17 November. The Level of Aviation Color Code remained at Orange. Based on information from KEMSD, the Tokyo VAAC reported that on 23 November an eruption produced a plume that rose to an altitude of 4 km (13,000 ft) a.s.l. Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
Kīlauea (United States) | 18 November-24 November 2009 | Continuing Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	During 18-24 November, HVO reported that lava flowed SE from beneath Kīlauea's Thanksgiving Eve Breakout (TEB) and rootless shield complex through a lava tube system, reaching the ocean at multiple locations between Waikupanaha and an area 700 m farther to the W. Thermal anomalies detected by satellite and visual observations revealed active surface lava flows at locations on and at the base of the pali, at the TEB vent, and on the coastal plain. Incandescence was seen on the Puʻu ʻŌʻō crater floor. The vent in Halemaʻumaʻu crater continued to produce a white or off-white plume that drifted mainly SW and dropped small amounts of ash downwind. Incandescence originated from a circulating and spattering lava pond that occasionally rose above and drained back below holes in the vent cavity floor. On 21 November, a sliver of the rim collapsed and was followed by an explosion that produced a dense brown plume that dissipated after a few minutes (http://hvo.wr.usgs.gov/kilauea/update/archive/2009/Nov/HMMvent_21Nov2009_x2speed.mov). Measurements indicated that the sulfur dioxide emission rate at the summit remained elevated; 700-1,100 tonnes per day was measured during 18-20 and 23 November. The 2003-2007 average rate was 140 tonnes per day. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Klyuchevskoy (Russia) | 18 November-24 November 2009 | Continuing Eruptive Activity Cite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	KVERT reported that during 13-20 November seismic activity from Kliuchevskoi was above background levels. Strombolian activity ejected tephra 200 m above the crater during 13-15 November. On 14 November, a new lava flow traveled 500 m down the ESE flank. Satellite imagery revealed a large daily thermal anomaly at the volcano. The Level of Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Pacaya (Guatemala) | 18 November-24 November 2009 | Continuing Eruptive Activity Cite this Report
Pacaya Central America Volcanic Arc	On 20 and 24 November, INSIVUMEH reported that white and blue plumes from Pacaya's MacKenney cone rose up to 400 m and drifted SSW. Multiple lava flows on the S and SW flanks traveled 100-250 m SE and SW. Incandescence at night was noted. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Popocatépetl (Mexico) | 18 November-24 November 2009 | Continuing Eruptive Activity Cite this Report
Popocatépetl Trans-Mexican Volcanic Arc	CENAPRED reported that during 18-20 November steam-and-gas plumes from Popocatépetl sometimes contained ash. A small explosion detected by the seismic network on 21 November was accompanied by an ash plume that rose to an altitude of 8.9 km (29,200 ft) a.s.l. The ash plume drifted E and caused ashfall in Atlixco (23 km SE), Huejotzingo (27 km NE), and areas in the state of Tlaxcala. Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Rabaul (Papua New Guinea) | 18 November-24 November 2009 | Continuing Eruptive Activity Cite this Report
Rabaul Bismarck Volcanic Arc	Based on analyses of satellite imagery, the Darwin VAAC reported that on 19 November ash plumes from Rabaul caldera's Tavurvur cone rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 35-90 km NW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Reventador (Ecuador) | 18 November-24 November 2009 | Continuing Eruptive Activity Cite this Report
Reventador Northern Andean Volcanic Arc	Based on a pilot observation, the Washington VAAC reported that on 20 November an ash plume from Reventador rose to an altitude of 6.1 km (20,000 ft) a.s.l. A thermal anomaly was detected on satellite imagery. Source: Washington Volcanic Ash Advisory Center (VAAC)
Santa María (Guatemala) | 18 November-24 November 2009 | Continuing Eruptive Activity Cite this Report
Santa María Central America Volcanic Arc	On 20 November, INSIVUMEH reported that two explosions from Santa María's Santiaguito lava dome complex produced an ash plume that drifted SW. Avalanches descended the SW flank of the dome. An explosion on 24 November produced an ash plume the rose to an altitude of 3.3 km (10,800 ft) a.s.l. and drifted SE. Ashfall was reported in areas downwind. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Sheveluch (Russia) | 18 November-24 November 2009 | Continuing Eruptive Activity Cite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that during 13-20 November seismic activity from Shiveluch was above background levels, possibly indicating that ash plumes rose to an altitude of 5.3 km (17,400 ft) a.s.l. According to video camera data, fumarolic activity and hot avalanches were noted on 14 and 15 November. Analyses of satellite imagery revealed a large daily thermal anomaly on the lava dome. The Level of Aviation Color Code remained at Orange. Based on information from KEMSD, the Tokyo VAAC reported that on 18 November an eruption produced a plume that rose to an altitude of 5.5 km (18,000 ft) a.s.l. Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
Soufrière Hills (United Kingdom) | 18 November-24 November 2009 | Continuing Eruptive Activity Cite this Report
Soufrière Hills Lesser Antilles Volcanic Arc	MVO reported that during 13-20 November activity from the Soufrière Hills lava dome consisted of ash venting along with semi-continuous rockfalls and pyroclastic flows that were concentrated on the W flank. Ashfall occurred across many areas of the island. Views of the lava dome on 16 November showed that the dome height had decreased because of collapses and that a deep channel had developed NE of Chances Peak. Pyroclastic flows in the Gages Valley (W) continued down Spring Ghaut and Aymer's Ghaut, and spread onto the alluvial fan below St. Georges Hill. On 19 November, heavy ashfall occurred to the NW between Old Towne and Brades. The Hazard Level remained at 3. Source: Montserrat Volcano Observatory (MVO)
Suwanosejima (Japan) | 18 November-24 November 2009 | Continuing Eruptive Activity Cite this Report
Suwanosejima Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported an explosion from Suwanose-jima on 18 November. Details of possible resulting emissions were not reported. Source: Tokyo 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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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.

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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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