All times are local unless otherwise stated.

Anatahan | 28 November-4 December 2007 | New Activity / Unrest Cite this Report
Anatahan Mariana Islands (USA)	The amplitude of volcanic tremor at Anatahan gradually increased through October and November and small explosions occurred during the last week of November. On 29 November, the Volcanic Alert Level was raised to Advisory and the Aviation Color Code was raised to Yellow based on the increase in seismicity. Source: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program
Popocatepetl | 28 November-4 December 2007 | New Activity / Unrest Cite this Report
Popocatepetl Mexico	CENEPRED reported that multiple gas-and-steam plumes from Popocatépetl were observed during 28 November-4 December. On 1 December, high frequency seismic tremor was accompanied by an ash plume that rose to an altitude of 7.4 km (24,300 ft) a.s.l. and drifted N, and then NE. Ashfall was reported in areas downwind. Based on observations of satellite imagery, reports from the Mexico City MWO, and the web camera operated by CENEPRED, the Washington VAAC reported that the ash plume rose to an altitude of 9.1 km (30,000 ft) a.s.l. Sources: Washington Volcanic Ash Advisory Center (VAAC), Centro Nacional de Prevencion de Desastres (CENAPRED)
Talang | 28 November-4 December 2007 | New Activity / Unrest Cite this Report
Talang Central Sumatra	CVGHM raised the Alert level for Talang from 2 to 3 (on a scale of 1-4) on 29 November based on visual observations and seismicity. Ash and steam plumes from multiple craters rose to altitudes of 3.1-4.1 km (10,200-13,500 ft) a.s.l. during 27-29 November. A strong smell of sulfur dioxide gas was also reported. Visitors and tourists were advised not to go within a 3-km radius of the summit. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Bezymianny | 28 November-4 December 2007 | Continuing ActivityCite this Report
Bezymianny Central Kamchatka (Russia)	Based on reports from KVERT, the Washington VAAC reported an ash plume from Bezymianny at an altitude of 4.3 km (14,000 ft) a.s.l. on 2 December. Ash was not identified on satellite imagery. The level of Concern Color Code remained at Yellow. Sources: Washington Volcanic Ash Advisory Center (VAAC), Kamchatkan Volcanic Eruption Response Team (KVERT)
Colima | 28 November-4 December 2007 | Continuing ActivityCite this Report
Colima Mexico	Based on reports from the Mexico City MWO, the Washington VAAC reported that an ash plume from Colima rose to an altitude of 7.3 km (24,000 ft) a.s.l. and drifted W on 26 November. Observations of satellite imagery showed a plume to the NNE. Observers reported that steam and steam-and-ash plumes rose to altitudes of 3.9-4.6 km (12,800-15,100 ft) a.s.l. and drifted N and SW on 26, 27, and 29 November and during 3-4 December. Sources: Gobierno del Estado de Colima, Washington Volcanic Ash Advisory Center (VAAC)
Fuego | 28 November-4 December 2007 | Continuing ActivityCite this Report
Fuego South-Central Guatemala	Based on observations of satellite imagery, the Washington VAAC reported that an ash plume from Fuego drifted W on 29 November. Source: Washington Volcanic Ash Advisory Center (VAAC)
Galeras | 28 November-4 December 2007 | Continuing ActivityCite this Report
Galeras Colombia	Based on visual observations during clear weather, INGEOMINAS reported that steam-and-gas plumes from Galeras rose to a maximum altitude of 5.3 km (17,400 ft) a.s.l. during 21-23 November and 3 December. The plumes occasionally contained small volumes of ash and were associated with seismic tremor. Gas and ash plumes that rose to an altitude of 4.4 km (14,400 ft) a.s.l. and drifted NW were observed during an overflight on 27 November. Thermal images indicated an increase in temperatures since a 2 October overflight at the point sources of emissions. The Alert Level remained at 3 (changes in the behavior of volcanic activity have been noted) on a scale of 4-1. Source: Servicio Geológico Colombiano (SGC)
Jebel at Tair | 28 November-4 December 2007 | Continuing ActivityCite this Report
Jebel at Tair Yemen	Since the beginning of an eruption of Jebel at Tair on 30 September, the MODIS satellite detected thermal anomalies over the island every day through 4 December. According to a news article, an eruption took place on 4 December and lava flows intermittently occurred since 30 September. Sources: Hawai'i Institute of Geophysics and Planetology (HIGP) Thermal Alerts Team, IRIN News
Karymsky | 28 November-4 December 2007 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka (Russia)	KVERT reported that seismic activity at Karymsky was at background levels during 24-25 November and slightly above background levels on 26 November. Seismic data was unavailable on the other days during 23-30 November. The Level of Concern Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kelud | 28 November-4 December 2007 | Continuing ActivityCite this Report
Kelud Eastern Java	CVGHM reported that on 29 November, the Alert level for Kelut was lowered from 3 to 2 (on a scale of 1-4), due to a decrease in seismicity and a lack of deformation. Observations of video footage from a camera on 25 November revealed that the lava dome was still active. Visitors and tourists were advised not to go within a 1.5-km radius of the crater lake. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Kilauea | 28 November-4 December 2007 | Continuing ActivityCite this Report
Kilauea Hawaiian Islands (USA)	Based on overflights and web camera views, HVO reported that fissure segment D from Kilauea's 21 July fissure eruption continued to feed a lava channel and perched lava ponds that occasionally overflowed their edges during 28 November-3 December. Views were blocked by fumes on 4 December. The small lava pond at the top of the Thanksgiving Eve Breakout (TEB) shield, built directly over the fissure, occasionally overflowed and fed lava flows in multiple directions. On 1 December, one of these flows was L-shaped and 2.1 km long, but mostly active within the upper 800 m. A few small earthquakes were located beneath Halema'uma'u crater and along the SW rift zone and S-flank fault. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Sheveluch | 28 November-4 December 2007 | Continuing ActivityCite this Report
Sheveluch Central Kamchatka (Russia)	KVERT reported that seismic activity at Shiveluch was above background levels during 23-30 November. Based on seismic interpretation, ash plumes rose to an altitude of 6 km (19,700 ft) a.s.l. and hot avalanches occurred. Visual observations and video footage analysis indicated that gas-and-steam plumes rose to an altitude of 5 km (16,400 ft) a.s.l. on 22 and 26-29 November. Based on observations of satellite imagery, ash plumes drifted SW, NW, N, and SE on 26, 27, and 28 November and a thermal anomaly was present in the crater every day during the reporting period. The Level of Concern Color Code remained at Orange. Based on information from the KEMSD, the Tokyo VAAC reported that eruption plumes rose to altitudes of 5.5 km and 5.8 km (18,000 ft and 19,000 ft) a.s.l. on 30 November and 2 December, respectively. Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Kamchatkan Volcanic Eruption Response Team (KVERT)
Soufriere Hills | 28 November-4 December 2007 | Continuing ActivityCite this Report
Soufriere Hills Montserrat	MVO reported that during 23 November-3 December the lava dome at Soufrière Hills changed very little, based on visual observations. Seismic activity was very low and low-level rockfall and pyroclastic flow activity continued. Fumarolic activity on the N and E flanks of the dome were observed. On 29 November, a regional M 7.4 earthquake occurred at 1500. A few minutes later, a small pyroclastic flow traveled down the E flank. At 1530, three more pyroclastic flows traveled E down the Tar River Valley. The Alert Level remained elevated at 4 (on a scale of 0-5). Source: Montserrat Volcano Observatory (MVO)
St. Helens | 28 November-4 December 2007 | Continuing ActivityCite this Report
St. Helens Washington	Data from deformation-monitoring instruments indicated that during 28 November-4 December lava-dome growth at Mount St. Helens continued. Small inflation-deflation events occurred which were interpreted as dome-growth pulses. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. A GPS receiver on the W part of the active spine showed continued SW advance at a rate of 3-4 mm per day since September 2007. An image from a camera on the NE flank from 28 November showed no notable landscape changes. Clouds occasionally inhibited visual observations. Source: US Geological Survey Cascades Volcano Observatory (CVO)
Suwanosejima | 28 November-4 December 2007 | Continuing ActivityCite this Report
Suwanosejima Ryukyu Islands (Japan)	Based on information from JMA, the Tokyo VAAC reported that eruption plumes from Suwanose-jima rose to altitudes of 1.2-1.8 km (4,000-6,000 ft) a.s.l. during 29 November-2 December and drifted E. Ash was not visible on satellite imagery. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Tungurahua | 28 November-4 December 2007 | Continuing ActivityCite this Report
Tungurahua Ecuador	IG reported that although visual observations were occasionally limited due to cloud cover, ash-and-steam and ash plumes from Tungurahua rose to altitudes of 6-8 km (19,700-26,200 ft) a.s.l. during 27 November-4 December. During 28 November-1 December, seismic activity was elevated and multiple explosions were associated with almost continuous emissions of steam and ash. Explosions and "cannon shots" vibrated large windows and the ground within a 13 km radius of the summit on 28 and 29 November, and during 1-3 December. Ashfall was reported in areas to the SW, W, NW, N, and NE on 28 November, and 3-4 December. Incandescent blocks rolled 500-1000 m down the flanks on 28 November, 1 December, and 3 December. Roaring noises were occasionally reported. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Ubinas | 28 November-4 December 2007 | Continuing ActivityCite this Report
Ubinas Peru	Based on a pilot report and observations of satellite imagery, the Buenos Aires VAAC reported that ash plumes from Ubinas rose to altitudes of 6.7-7.6 km (22,000-25,000 ft) a.s.l. and drifted SW and NE during 28-29 November. Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 19,976 individual reports over 1,214 weeks (average of 16 per week) on 332 different volcanoes.

Use the dropdowns to choose the year and week for archived Weekly Reports.

 News Feeds and Google Placemarks

 Criteria & Disclaimers

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 more-or-less continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Moreover, Earth's sea-floor volcanism is seldom reported even though in theory it represents the single most prolific source of erupted material. 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.

Volcanoes are included in the "New Activity/Unrest" section of the Weekly Volcanic Activity Report if the activity occurs after at least 3 months of quiescence. Once a volcano is included in the "New Activity/Unrest" section, updates will remain in that section unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Continuing Activity" section. Volcanoes are also included in the "New Activity/Unrest" section if the volcano is undergoing a period of relatively high unrest, or increasing unrest. This is commonly equal to Alert Level Orange on a scale of Green, Yellow, Orange, Red, where Red is the highest alert. Or alert level 3 on a scale of 1-4 or 1-5.

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 receive a report.

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. Because of our emphasis on rapid reporting on the web we have avoided diacritical marks. 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.

5. USGS Disclaimer Statement for this Website:

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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For site security purposes and to ensure that this service remains available to all users, this government computer system employs software programs to monitor network traffic to identify unauthorized attempts to upload or change information, or otherwise cause damage. Unauthorized attempts to upload information or change information on this website are strictly prohibited and may be punishable under the Computer Fraud and Abuse Act of 1986 and the National Information Infrastructure Protection Act. Information may also be used for authorized law enforcement investigations. (Last modified September 21, 1999.)

U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
URL: https://volcano.si.edu/reports_weekly.cfm

 Acronyms and Abbreviations

a.s.l. - above sea level

AVO - Alaska Volcano Observatory

AVHRR - Advanced Very High Resolution Radiometer

CENAPRED - Centro Nacionale de Prevencion de Desastres (México)

CONRED - Coordinadora Nacional para la Reducción de Desastres

COSPEC - Correlation Spectrometer

CVGHM (formerly VSI) - Center of Volcanology and Geological Hazard Mitigation

CVO - Cascades Volcano Observatory (USGS)

GMS - Geostationary Meteorological Satellite

GOES - Geostationary Operational Environmental Satellite

GVO - Goma Volcano Observatory

GVP - Global Volcanism Program (Smithsonian Institution)

HVO - Hawaiian Volcano Observatory (USGS)

ICE - Instituto Costarricense de Electricidad (Costa Rica)

IG - Instituto Geofísico (Ecuador)

IGNS - Institute of Geological and Nuclear Sciences (New Zealand) - now GNS Science

INETER - Instituto Nicaragüense de Estudios Territoriales (Nicaragua)

INGEMMET - Instituto Geológical Minero y Metalúrgico (Peru)

INGEOMINAS - Instituto Colombiano de Geología y Minería (Colombia)

INGV-CT - Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Catania (Italy)

INSIVUMEH - Instituto Nacional de Sismologia, Vulcanologia, Meteorologia e Hidrologia (Guatemala)

IRD - Institut de Recherche pour le Développement (France)

JMA - Japanese Meteorological Agency

KEMSD - Kamchatkan Experimental and Methodical Seismilogical Department

KVERT - Kamchatkan Volcanic Eruption Response Team

M - magnitude

METEOSAT - Meteorological Satellite

MEVO - Mount Erebus Volcano Observatory

MODIS - Moderate Resolution Imaging Spectroradiometer

MVO - Montserrat Volcano Observatory

MWO - Meteorological Watch Office

NEIC - National Earthquake Information Center

NIED - National Research Institute for Earth Science and Disaster Prevention (Japan)

NOAA - National Oceanic and Atmospheric Administration

NOTAM - Notice to Airmen

OVDAS - Observatorio Volcanologico de los Andes del Sur (Chile)

OFDA - Office of US Foreign Disaster Assistance

ONEMI - Oficina Nacional de Emergencia - Ministerio del Interior (Chile)

OVPDLF - Observatoire Volcanologique du Piton de la Fournaise (France)

OVSICORI-UNA - Observatorio Vulcanologico y Sismologico de Costa Rica, Universidad Nacional (Costa Rica)

PHIVOLCS - Philippine Institute of Volcanology and Seismology (Philippines)

RSAM - Real-time Seismic Amplitude Measurement

RVO - Rabaul Volcano Observatory

SERNAGEOMIN - Servicio Nacional de Geologia y Mineria (Chile)

SIGMET - Significant Meteorological Information

SNET - Servicio Nacional de Estudios Territoriales (El Salvador)

SVERT - Sakhalin Volcanic Eruption Response Team (Russia)

USAID - US Agency for International Development

USGS - United States Geological Survey

UTC - Coordinated Universal Time

VAAC - Volcanic Ash Advisory Center

VAFTAD - Volcanic Ash Forecast Transport And Dispersion

VDAP - Volcano Disaster Assistance Program (USGS)

VHP - Volcano Hazards Program (USGS)

VRC - Volcano Research Center (Japan)