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Smithsonian / USGS Weekly Volcanic Activity Report

You are currently viewing Archived reports for the week of 21 February-27 February 2007.


















 Activity for the week of 21 February-27 February 2007

The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program. Updated by 2300 UTC every Wednesday, notices of volcanic activity posted on these pages are preliminary and subject to change as events are studied in more detail. This is not a comprehensive list of all of Earth's volcanoes erupting during the week, but rather a summary of activity at volcanoes that meet criteria discussed in detail in the "Criteria and Disclaimers" section. Carefully reviewed, detailed reports on various volcanoes are published monthly in the Bulletin of the Global Volcanism Network.

Name Location Activity
Klyuchevskoy Central Kamchatka (Russia) New
Nevado del Huila Colombia New
Stromboli Aeolian Islands (Italy) New
Tungurahua Ecuador New
White Island North Island (New Zealand) New

Karymsky Eastern Kamchatka (Russia) Ongoing
Kilauea Hawaiian Islands (USA) Ongoing
Langila New Britain (Papua New Guinea) Ongoing
Manam Papua New Guinea Ongoing
Rabaul New Britain (Papua New Guinea) Ongoing
Sangay Ecuador Ongoing
Santa Maria Guatemala Ongoing
Sheveluch Central Kamchatka (Russia) Ongoing
Soufriere Hills Montserrat Ongoing
St. Helens United States Ongoing
Ubinas Peru Ongoing


New Activity / Unrest


Volcano index photo  Klyuchevskoy  | Central Kamchatka (Russia)  | 56.056°N, 160.642°E  | Elevation 4754 m

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: Kamchatkan Volcanic Eruption Response Team (KVERT), RIA Novosti, Tokyo Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Nevado del Huila  | Colombia  | 2.93°N, 76.03°W  | Elevation 5364 m

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)



Volcano index photo  Stromboli  | Aeolian Islands (Italy)  | 38.789°N, 15.213°E  | Elevation 924 m

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: Deutsche Presse-Agentur, United Press International



Volcano index photo  Tungurahua  | Ecuador  | 1.467°S, 78.442°W  | Elevation 5023 m

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: Instituto Geofísico-Escuela Politécnica Nacional (IG), Washington Volcanic Ash Advisory Center (VAAC)



Volcano index photo  White Island  | North Island (New Zealand)  | 37.52°S, 177.18°E  | Elevation 321 m

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)



Ongoing Activity


Volcano index photo  Karymsky  | Eastern Kamchatka (Russia)  | 54.049°N, 159.443°E  | Elevation 1513 m

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: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Kilauea  | Hawaiian Islands (USA)  | 19.421°N, 155.287°W  | Elevation 1222 m

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)



Volcano index photo  Langila  | New Britain (Papua New Guinea)  | 5.525°S, 148.42°E  | Elevation 1330 m

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)



Volcano index photo  Manam  | Papua New Guinea  | 4.08°S, 145.037°E  | Elevation 1807 m

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)



Volcano index photo  Rabaul  | New Britain (Papua New Guinea)  | 4.271°S, 152.203°E  | Elevation 688 m

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)



Volcano index photo  Sangay  | Ecuador  | 2.005°S, 78.341°W  | Elevation 5286 m

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)



Volcano index photo  Santa Maria  | Guatemala  | 14.757°N, 91.552°W  | Elevation 3745 m

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: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH), Washington Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Sheveluch  | Central Kamchatka (Russia)  | 56.653°N, 161.36°E  | Elevation 3283 m

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: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Soufriere Hills  | Montserrat  | 16.72°N, 62.18°W  | Elevation 915 m

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: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC)



Volcano index photo  St. Helens  | United States  | 46.2°N, 122.18°W  | Elevation 2549 m

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)



Volcano index photo  Ubinas  | Peru  | 16.355°S, 70.903°W  | Elevation 5672 m

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)



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 News Feeds and Google Placemarks


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 Geologic Summary, and a link to the volcano's page from the Global Volcanism Program. Each volcano report includes a link from the volcano's name back to the more complete information in the Weekly Volcanic Activity Report on the Smithsonian website.




The CAP (Common Alerting Protocol) feeds are XML files specifically formatted for disaster management. They are similar in content to the RSS feed, but contain no active links.




A Google Earth network link for the Weekly Volcanic Activity Report can be loaded into the free Google Earth software, and in turn will load placemarks for volcanoes in the current weekly report. Placemark balloons include the volcano name, report date, report text, sources, and links back to the GVP volcano page for that volcano and to the complete Weekly Report for that week.

 Criteria & Disclaimers

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 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.


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 monthly, and 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.

Some of the documents on this server may contain live references (or pointers) to information created and maintained by other organizations. Please note that USGS does not control and cannot guarantee the relevance, timeliness, or accuracy of these outside materials.

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RSS and CAP Feeds

An RSS (Really Simple Syndication) feed for the Weekly Volcanic Activity Report first made available on 5 March 2008 can be utilized with the aid of various free downloadable readers. The report content of the news feed is identical to the Weekly Volcanic Activity Report minus some features including the header information (latitude and longitude and summit elevation), the Geologic Summary, and a link to the volcano's page from the Global Volcanism Program. Each volcano report includes a link from the volcano's name back to the more complete information in the Weekly Volcanic Activity Report on the Smithsonian website. On 12 March 2009, GeoRSS tags were added so that the latitude and longitude for each volcano could be included with the feed.

At the end of each individual report is a list of the sources used. We would like to emphasize that the World Organization of Volcano Observatories (WOVO) website (http://www.wovo.org/) lists the regional volcano observatories that have the most authoritative data for many of these events.

CAP (Common Alerting Protocol) feeds are XML files specifically formatted for disaster management.


Google Earth Placemarks

A Google Earth network link for the Weekly Volcanic Activity Report was first made available on 1 April 2009. This file can be loaded into the free Google Earth software, and in turn will load placemarks for volcanoes in the current weekly report. Placemark balloons include the volcano name, report date, report text, sources, and links back to the GVP volcano page for that volcano and to the complete Weekly Report for that week.

 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)