All times are local unless otherwise stated.

Klyuchevskoy | 21 February-27 February 2007 | New Activity / Unrest Cite this Report
Klyuchevskoy Central Kamchatka (Russia)	Seismic activity at Kliuchevskoi continued at above background levels during 16-22 February. Based on observation and video data, gas-and-steam plumes rose to an altitude of 5.3 km (17,400 ft) a.s.l. and drifted E. These plumes possibly contained some ash. A thermal anomaly at the summit was seen on satellite imagery during 16-19 and 21 February. Based on information from KEMSD and satellite imagery, the Tokyo VAAC reported that eruption plumes possibly reached altitudes of 6.1 km (20,000 ft) a.s.l. and drifted E during 22-23 February. According to a news article, ash particles up to 2 mm in diameter fell on the village of Klyuchi, about 40 km N on 26 February. Sources: Tokyo Volcanic Ash Advisory Center (VAAC), RIA Novosti, Kamchatkan Volcanic Eruption Response Team (KVERT)
Nevado del Huila | 21 February-27 February 2007 | New Activity / Unrest Cite this Report
Nevado del Huila Colombia	INGEOMINAS reported that seismic activity from Nevado del Huila remained elevated during 21-23 February. On 21 February, steam plumes rose to altitudes of 5.7 km (18,700 ft) a.s.l. and drifted W. On 24 February, fumarolic activity from the central and N areas on the volcano was not seen during aerial observations. Source: Servicio Geológico Colombiano (SGC)
Stromboli | 21 February-27 February 2007 | New Activity / Unrest Cite this Report
Stromboli Aeolian Islands (Italy)	Based on news reports, lava from Stromboli was observed flowing from two craters near the summit on 27 February. One lava flow traveled down the flanks more than 900 m and reached the sea. Several explosions per hour were audible. Sources: United Press International, Deutsche Presse-Agentur
Tungurahua | 21 February-27 February 2007 | New Activity / Unrest Cite this Report
Tungurahua Ecuador	Volcanic tremor and long-period earthquakes from Tungurahua began at approximately 2100 on 23 February. On 24 February at 0310, tremor amplitude increased. Incandescent material was ejected 800 m above the summit and fell on the flanks about 1 km below the summit. An eruption plume drifted NW and roaring noises were audible. Gravel and sand-sized ash reportedly fell at Pillate (8 km W) and San Juan (40 km WSW) and in places accumulated up to 3 mm thick. Deposits of ash 2 mm thick were reported from Bilbao (8 km W), Cotaló (8 km NW), Manzano (8 km SW), and Choglontus (W). On 25 February, 12 moderate to large explosions occurred according to seismic interpretation. Based on satellite imagery, MWO, pilot reports, and the IG, the Washington VAAC reported that ash plumes rose to altitudes of 7.6-12.2 km (25,000-40,000 ft) a.s.l. during 24-25 February. Plumes drifted SW and NW. On 26 February, a plume with no ash content rose to 6 km (19,700 ft) a.s.l. and drifted W. Later that day, two explosions produced ash plumes that 7 km (23,000 ft) a.s.l. and again drifted W. On 27 February, incandescent material was ejected above the summit and fell on the flanks about 500 m down the flanks. Noises produced by material rolling down the flanks and "cannon shots" were heard during 25-27 February. Sources: Washington Volcanic Ash Advisory Center (VAAC), Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Whakaari/White Island | 21 February-27 February 2007 | New Activity / Unrest Cite this Report
Whakaari/White Island North Island (New Zealand)	Based on pilot and volcanologist reports, the Wellington VAAC reported that a steam plume from White Island rose to an altitude of 3.0 km (10,000 ft) a.s.l. on 23 February. Source: Wellington Volcanic Ash Advisory Center (VAAC)

Karymsky | 21 February-27 February 2007 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka (Russia)	Seismic activity at Karymsky was above background levels during 16-22 February, with 100-180 shallow earthquakes occurring daily. Ash plumes may have reached altitudes of 3.0 km (9,900 ft) a.s.l. during the reporting period. A thermal anomaly in the crater was detected on satellite imagery during 16-19 February. Based on satellite imagery and information from KEMSD, the Tokyo VAAC reported that eruption plumes rose to altitudes of 4.0-5.2 km (13,000-17,000 ft) a.s.l. on 22 and 27 February. The Level of Concern Color Code remained at Orange. Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea | 21 February-27 February 2007 | Continuing ActivityCite this Report
Kilauea Hawaiian Islands (USA)	During 21-27 February, lava from Kilauea continued to flow from lava deltas into the ocean at the East Lae'apuki, Kamokuna, and East Ka'ili'ili entries. Incandescence was intermittently visible from several breakouts on the pali and from several vents in Pu'u 'O'o's crater. On 22 February, HVO field crews reported gas jetting from vents on the S side of Pu'u 'O'o. Tremor at Kilauea's summit continued at low levels. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Langila | 21 February-27 February 2007 | Continuing ActivityCite this Report
Langila New Britain (Papua New Guinea)	On 13 and 14 February, eruptive activity at Langila's Crater 2 consisted of continuous emissions of gray ash plumes. During 15-23 February the emissions became forceful. Plumes rose to an altitude of 2.3 km (7,500 ft) a.s.l. and drifted SE and SW. Occasional roaring noises were heard accompanying emissions. Incandescence was observed at the summit. Sources: Darwin Volcanic Ash Advisory Centre (VAAC), Rabaul Volcano Observatory (RVO)
Manam | 21 February-27 February 2007 | Continuing ActivityCite this Report
Manam Northeast of New Guinea	RVO reported that Manam's South Crater emitted gray ash plumes during 15-19 February and white vapor plumes on 21 February. Gray ash plumes continually emitted from Main Crater rose to an altitude of 2.3 km (7,500 ft) a.s.l. and drifted SE during 19-21 February. Source: Rabaul Volcano Observatory (RVO)
Rabaul | 21 February-27 February 2007 | Continuing ActivityCite this Report
Rabaul New Britain (Papua New Guinea)	RVO reported that during 16-24 February, Rabaul caldera's Tavurvur cone emitted white vapor plumes that rose to 0.9-3.7 km (3,000-12,000 ft) a.s.l. and drifted N, W, and E. Ash clouds were emitted on 16, 19, 21, and 23-24 February and ashfall was reported from surrounding villages on 20 February. Loud roaring noises were occasionally heard. On 22 February, a moderate explosion produced fragments that showered the flanks. On 27 February, the Darwin VAAC reported that a diffuse plume was visible on satellite imagery. On 28 February, RVO reported a large explosion produced an ash plume that rose to an altitude of 2.7 km (8,900 ft) a.s.l. and drifted NE. Sources: Darwin Volcanic Ash Advisory Centre (VAAC), Rabaul Volcano Observatory (RVO)
Sangay | 21 February-27 February 2007 | Continuing ActivityCite this Report
Sangay Ecuador	The Washington VAAC reported eruptions from Sangay based on information from Guayaquil MWO, IG, pilot reports, and satellite imagery. Ash plumes reached altitudes of 10.7 km (35,000 ft) a.s.l. on 23 February and 6.4 km (21,000 ft) a.s.l. on 25 February. Plumes drifted S and SW, respectively. Source: Washington Volcanic Ash Advisory Center (VAAC)
Santa Maria | 21 February-27 February 2007 | Continuing ActivityCite this Report
Santa Maria Southwestern Guatemala	Based on satellite imagery, the Washington VAAC reported that diffuse ash plumes from Santa María's Santiaguito lava dome complex drifted mainly W and N during 22, 23, and 25-27 February. INSIVUMEH reported seven explosions produced ash plumes that rose to altitudes of 4.4-4.6 km (14,400-15,100 ft) a.s.l. and drifted SW on 26 February. Avalanches occurred from lava-flow fronts on the SW flanks and from the S edge of Caliente Dome. A hotspot was seen on satellite imagery. On 27 February, explosions occurring at an approximate rate of 3 per hour produced ash plumes that reached altitudes of 4.8 km (15,700 ft) a.s.l. Occasionally explosions were accompanied by pyroclastic flows that traveled SW. Sources: Washington Volcanic Ash Advisory Center (VAAC), Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Sheveluch | 21 February-27 February 2007 | Continuing ActivityCite this Report
Sheveluch Central Kamchatka (Russia)	Seismic activity at Shiveluch continued above background levels during 16-22 February. Based on seismic interpretation, observation, and video data, gas-and-ash plumes rose to altitudes of 6 km (19,700 ft) a.s.l. throughout the reporting period. Plumes drifted S, NW, and N. A large thermal anomaly was visible on satellite imagery. The Tokyo VAAC reported eruption plumes to altitudes of 4.6 km (15,000 ft) a.s.l. on 22 February based on information from KEMSD, KVERT, and satellite imagery. Plumes drifted N. The Level of Concern Color Code remained at Orange. Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Kamchatkan Volcanic Eruption Response Team (KVERT)
Soufriere Hills | 21 February-27 February 2007 | Continuing ActivityCite this Report
Soufriere Hills Montserrat	During 16-23 February, lava-dome growth at Soufrière Hills continued and was concentrated on the E and N sides. Small pyroclastic flows traveled down the Tar River Valley to the E, Gages to the W, and Tyres Ghaut to the NW. Ash venting and roaring noises originated from an area above Gages to the SW, where a new blocky lobe was visible. Moderately-sized pyroclastic flows traveled E down the Tar River Valley during 24-25 and 27 February. Bright incandescence at the dome was observed during the reporting period. Based on satellite data, pilot reports, and information from the MVO, the Washington VAAC reported continuous ash emissions during 21-27 February. Resultant plumes rose to altitudes of 2.1-6.1 km (7,000-20,000 ft) a.s.l. and drifted mainly NE, NW, and W. A thermal anomaly was detected in the crater on satellite imagery. Sources: Washington Volcanic Ash Advisory Center (VAAC), Montserrat Volcano Observatory (MVO)
St. Helens | 21 February-27 February 2007 | Continuing ActivityCite this Report
St. Helens Washington	Data from deformation-monitoring instruments showed that during 21-27 February, the lava dome at Mount St. Helens continued to grow. Seismicity continued at low levels, punctuated by M 1.5-2.5 and occasionally larger earthquakes. Inclement weather inhibited visual observations. Source: US Geological Survey Cascades Volcano Observatory (CVO)
Ubinas | 21 February-27 February 2007 | Continuing ActivityCite this Report
Ubinas Peru	Based on pilot reports, the Buenos Aires VAAC reported continuous emissions from Ubinas on 21 February. Ash plumes rose to 5.5-6.7 km (18,000-22,000 ft) a.s.l. and drifted SW. Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,019 individual reports over 1,216 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)