All times are local unless otherwise stated.

Kanlaon (Philippines) | 23 December-29 December 2015 | New Eruptive Activity Cite this Report
Kanlaon Negros-Sulu Volcanic Arc	PHIVOLCS reported that at 1457 on 23 December the seismic network at Kanlaon detected an explosion. The event was not visually observed due to dense weather clouds around the summit area but rumbling was heard in nearby barangays including Cabagnaan, La Castellana (16 km SW), and Ara-al and Yubo, La Carlota City (14 km W). Minor amounts of ash fell in Ara-al, Haguimit, and La Granja, La Carlota City, and a sulfur odor was noted in barangay Tres Elis, La Castellana. An explosive event detected by the seismic network at 2109 on 24 December was again not visually observed. Trace amounts of ash fell in Ara-al, Haguimit, and La Granja, and a sulfur odor was reported in Tres Elis. White steam plumes rose 100 m above the crater and drifted SW on 26 December. A five-minute long ash event that began at 1329 on 27 December was accompanied by rumbling heard in a few local barangays. An eruption plume, viewed from the SE flank, rose 1 km above the crater, and may have risen as high as 4.5 km based on pilot observations. Minor ashfall was noted in Ara-al, Yubo, and La Granja, Cabagnaan, Sag-ang (La Castellana), barangay Miranda, Hinigaran (Negros Occidental), Municipality of Pontevedra (Negros Occidental), and reached as far as Nueva Valencia, Guimaras (58 km WNW). The Alert Level remained at 1 (on a scale of 0-5). Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Tengger Caldera (Indonesia) | 23 December-29 December 2015 | New Eruptive Activity Cite this Report
Tengger Caldera Sunda Volcanic Arc	Based on satellite and webcam images, the Darwin VAAC reported that during 23-29 December ash plumes from Tengger Caldera's Bromo cone rose to altitudes of 3.6-4.2 km (12,000-14,000 ft) a.s.l. and drifted 45-205 km N, NNE, NE, E, and SE. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Chirpoi (Russia) | 23 December-29 December 2015 | Continuing Eruptive Activity Cite this Report
Chirpoi Kuril Volcanic Arc	SVERT reported that satellite images detected a weak thermal anomaly over Snow, a volcano of Chirpoi, during 21-23 and 27 December. The Aviation Color Code remained at Yellow. Source: Sakhalin Volcanic Eruption Response Team (SVERT)
Colima (Mexico) | 23 December-29 December 2015 | Continuing Eruptive Activity Cite this Report
Colima Trans-Mexican Volcanic Arc	Based on satellite images, wind data, webcam images, Colima Towers, and notices from the Mexico City MWO, the Washington VAAC reported that during 23-29 December ash plumes from Colima rose to altitudes of 4.6-6.1 km (15,000-20,000 ft) a.s.l. and drifted as far as 150 km NE, ENE, and E. Source: Washington Volcanic Ash Advisory Center (VAAC)
Copahue (Chile-Argentina) | 23 December-29 December 2015 | Continuing Eruptive Activity Cite this Report
Copahue Southern Andean Volcanic Arc	Based on satellite and webcam views, the Buenos Aires VAAC reported that during 24-25, 27, and 29 December diffuse ash plumes from Copahue rose to altitudes of 3-3.6 km (10,000-12,000 ft) a.s.l. and drifted SE. Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
Dukono (Indonesia) | 23 December-29 December 2015 | Continuing Eruptive Activity Cite this Report
Dukono Halmahera Volcanic Arc	Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 23-29 December ash plumes from Dukono rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted as far as 115 km S and SW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Karymsky (Russia) | 23 December-29 December 2015 | Continuing Eruptive Activity Cite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that moderate explosive activity at Karymsky continued during 18-25 December. Satellite images detected an ash cloud, 8 x 6 km in size, drifting W on 22 December, and a thermal anomaly during 23-24 December. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kīlauea (United States) | 23 December-29 December 2015 | Continuing Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	HVO reported that seismicity beneath Kīlauea's summit, upper East Rift Zone, and Southwest Rift Zone was at background levels during 23-29 December. The lava lake continued to circulate and spatter in the Overlook vent. Webcams recorded multiple incandescent outgassing vents within Puʻu ʻŌʻō Crater and high on the northeast rim. The June 27th NE-trending lava flow continued to be active within 6 km NE of Puʻu ʻŌʻō Crater. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Nevado del Ruiz (Colombia) | 23 December-29 December 2015 | Continuing Eruptive Activity Cite this Report
Nevado del Ruiz Northern Andean Volcanic Arc	Servicio Geológico Colombiano’s (SGC) Observatorio Vulcanológico y Sismológico de Manizales reported that during 22-28 December seismicity at Nevado del Ruiz was characterized by long-period earthquakes and continuous volcanic tremor associated with gas-and-ash emissions. Earthquakes occurred at depths between 1 and 7.7 km. The largest event was recorded at 1457 on 28 December; it was a local M 1.4, 7 km N of Arenas Crater at a depth of 5.4 km. Significant amounts of water vapor and gas rose from the crater during the week. A gas, steam, and ash plume rose 1.7 km and drifted NW on 28 December. The Alert Level remained at III (Yellow; "changes in the behavior of volcanic activity"). Source: Servicio Geológico Colombiano (SGC)
Sheveluch (Russia) | 23 December-29 December 2015 | Continuing Eruptive Activity Cite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that during 18-25 December lava-dome extrusion onto Sheveluch’s N flank was accompanied by fumarolic activity, dome incandescence, ash explosions, and hot avalanches. Satellite images detected a daily and intense thermal anomaly over the dome, and ash plumes from hot avalanches rose up to 5 km (16,400 ft) a.s.l. that drifted SE on 21 December. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Sinabung (Indonesia) | 23 December-29 December 2015 | Continuing Eruptive Activity Cite this Report
Sinabung Sunda Volcanic Arc	Based on information from PVMBG, satellite images, and ground reports, the Darwin VAAC reported that during 25 and 27-28 December ash plume from Sinabung rose to altitudes of 3.4-4 km (11,000-13,000 ft) a.s.l. Plumes drifted 10 km SW on 27 December. 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.

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