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Smithsonian / USGS Weekly Volcanic Activity Report

You are currently viewing Archived reports for the week of 16 November-22 November 2005.


















 Activity for the week of 16 November-22 November 2005

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
Galeras Colombia New
San Cristobal Nicaragua New

Avachinsky Eastern Kamchatka (Russia) Ongoing
Colima Mexico Ongoing
Fuego Guatemala Ongoing
Karymsky Eastern Kamchatka (Russia) Ongoing
Kilauea Hawaiian Islands (USA) Ongoing
Reventador Ecuador Ongoing
Santa Ana El Salvador Ongoing
Santa Maria Guatemala Ongoing
Soufriere Hills Montserrat Ongoing
St. Helens United States Ongoing
Tungurahua Ecuador Ongoing


New Activity / Unrest


Volcano index photo  Galeras  | Colombia  | 1.22°N, 77.37°W  | Elevation 4276 m

Heightened seismic activity continued at Galeras during 16-22 November. According to news articles, only ~1,000 of the ~9,000 residents who were ordered to evacuate had left as of 18 November.

Sources: Servicio Geológico Colombiano (SGC), Associated Press



Volcano index photo  San Cristobal  | Nicaragua  | 12.702°N, 87.004°W  | Elevation 1745 m

There was an increase in seismicity at San Cristóbal beginning on 19 November. Increased tremor was interpreted as being related to gas and ash emissions. Ash fell W of the volcano and near the town of Chinandega, ~15 km SW of the volcano. The amount of tremor decreased later.

Source: Instituto Nicaragüense de Estudios Territoriales (INETER)



Ongoing Activity


Volcano index photo  Avachinsky  | Eastern Kamchatka (Russia)  | 53.256°N, 158.836°E  | Elevation 2717 m

Seismic activity at Avachinsky began to increase significantly on 21 November, with very shallow earthquakes and several hybrid earthquakes recorded at the volcano during 0800-2400. A weak thermal anomaly near the volcano's summit was visible on satellite imagery during 20-21 November. KVERT reported that based on these changes, the possibility of sudden ash explosions had increased. The Concern Color Code remained at Yellow as it has since 8 November.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



Volcano index photo  Colima  | Mexico  | 19.514°N, 103.62°W  | Elevation 3850 m

Several small explosions occurred at Colima during 16-21 November that produced steam-and-ash clouds to low levels above the volcano.

Sources: Centro Universitario de Estudios e Investigaciones de Vulcanologia - Universidad de Colima, Washington Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Fuego  | Guatemala  | 14.473°N, 90.88°W  | Elevation 3763 m

During 17-21 November, lava flows from Fuego continued to travel towards the Ceniza (to the S), Taniluyá (to the S), and Santa Teresa (to the W) ravines.

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)



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

The lava dome in Karymsky's crater continued to grow during 11-18 November. No seismic data were available after 10 November. A thermal anomaly was visible at the volcano on 15 and 17 November. Karymsky remained at Concern Color Code Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



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

During 18-22 November, lava from Kilauea continued to enter the sea at the East Lae`apuki area and surface lava flows were visible on the Pulama pali fault scarp. Background volcanic tremor was near normal levels at Kilauea's summit. Volcanic tremor reached moderate levels at Pu`u `O`o. Small amounts of deformation occurred at the volcano.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)



Volcano index photo  Reventador  | Ecuador  | 0.077°S, 77.656°W  | Elevation 3562 m

During 7-13 November, the number of earthquakes at Reventador increased slightly in comparison to the previous week. Small explosions produced ash plumes that rose to a height of ~4.6 km (15,000 ft) a.s.l.

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



Volcano index photo  Santa Ana  | El Salvador  | 13.853°N, 89.63°W  | Elevation 2381 m

During 16-21 November seismicity at Santa Ana was above background levels; a minor increase on 17 November was probably due to strong wind disturbing the seismic equipment. Small earthquakes occurred that were interpreted as being associated with the fracturing of rocks and gas pulses. The amount of gas emitted was low. The daily sulfur-dioxide flux averaged about 1,000 metric tons during 11-17 November. The Alert Level within a 5-km radius around the volcano's central crater remained at Red, the highest level.

Source: Servicio Nacional de Estudios Territoriales (SNET)



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

During 17-21 November, several weak-to-moderate explosions occurred at Santa Maria's Santiaguito lava-dome complex, producing ash plumes to a maximum height of ~4.6 km (15,000 ft) a.s.l. Several small pyroclastic flows traveled down the SW and NE flanks of Caliente dome, stopping at the base of the dome. Avalanches of volcanic material spalled off of the fronts of active lava flows and traveled SW.

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)



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

Seismic and volcanic activity at Soufrière Hills remained at elevated levels during 11-18 November. Clear observations of the lava dome on the morning of 18 November indicated that it continued to grow and was shedding rockfalls to the E, S, W, and NW. A pyroclastic flow was observed in the Tar River valley on 15 November and reached to within a kilometer of the sea. The ash cloud associated with this event rose to ~2.1 km (~7,000 ft) a.s.l. The sulfur-dioxide flux averaged 650 metric tons per day.

Source: Montserrat Volcano Observatory (MVO)



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

Growth of the new lava dome inside the crater of Mount St. Helens continued during 16-20 November, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. Two notable rockfalls occurred on 22 November at 1200 and shortly after 1500. Both produced dilute ash clouds that rose a few hundred meters above the crater rim. These types of rockfalls are common during lava-dome growth. There were no significant changes in seismicity or deformation during the report period. St Helens remained at Volcano Advisory (Alert Level 2); aviation color code Orange.

Source: US Geological Survey Cascades Volcano Observatory (CVO)



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

During 15-21 November, volcanic activity at Tungurahua remained at low levels with small emissions of steam and gas, with low ash content. Plumes rose to a maximum height of ~9.1 km (30,000 ft) a.s.l. on 15 November.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)



Weekly Reports Archive

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Agung Fuego Little Sitkin Salak
Ahyi Fujisan Llaima San Cristobal
Aira Fukutoku-Oka-no-Ba Loihi San Miguel
Akan Galeras Lokon-Empung San Vicente
Alaid Galunggung Lopevi Sangay
Alu-Dalafilla Gamalama Machin Sangeang Api
Ambae Gamkonora Makian Santa Ana
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Ambrym Gorely Maly Semyachik Sarigan
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Antuco Grimsvotn Manda Hararo Saunders
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Azumayama Hood Misti, El Slamet
Bagana Hudson, Cerro Miyakejima Soputan
Balbi Huila, Nevado del Momotombo Sorikmarapi
Bamus Hunga Tonga-Hunga Ha'apai Monowai Sotara
Banda Api Ibu Montagu Island Soufriere Hills
Bardarbunga Ijen Moyorodake [Medvezhia] Soufriere St. Vincent
Barren Island Iliamna Mutnovsky South Sarigan Seamount
Batur Iliwerung Myojinsho Spurr
Bezymianny Inielika Nabro St. Helens
Bogoslof Ioto Negra, Sierra Stromboli
Brava Iya Negro, Cerro Sulu Range
Bristol Island Izu-Torishima Nightingale Island Sumbing
Bulusan Jackson Segment Nishinoshima Sundoro
Calbuco Kaba Nisyros Suretamatai
Callaqui Kadovar Novarupta Suwanosejima
Cameroon Kambalny NW Rota-1 Taal
Campi Flegrei del Mar di Sicilia Kanaga Nyamuragira Tair, Jebel at
Cayambe Kanlaon Nyiragongo Takawangha
Cereme Karangetang Okataina Talang
Chachadake [Tiatia] Karkar Okmok Tambora
Chaiten Karthala Ontakesan Tanaga
Chiginagak Karymsky Oraefajokull Tandikat-Singgalang
Chikurachki Kasatochi Osorno Tangkoko-Duasudara
Chiles-Cerro Negro Katla Pacaya Tangkuban Parahu
Chillan, Nevados de Kavachi Pagan Tara, Batu
Chirinkotan Kelimutu Palena Volcanic Group Telica
Chirpoi Kelut Paluweh Tenerife
Cleveland Kerinci Panarea Tengger Caldera
Colima Ketoi Papandayan Three Sisters
Colo Kharimkotan Parker Tinakula
Concepcion Kick 'em Jenny Pavlof Tofua
Copahue Kikai Peuet Sague Tokachidake
Cotopaxi Kilauea Pinatubo Tolbachik
Cuicocha Kirishimayama Planchon-Peteroa Toliman
Cumbal Kizimen Poas Tongariro
Dabbahu Klyuchevskoy Popocatepetl Tungurahua
Dempo Kolokol Group Puyehue-Cordon Caulle Turrialba
Descabezado Grande Korovin Rabaul Ubinas
Dieng Volcanic Complex Koryaksky Raikoke Ulawun
Dukono Krakatau Ranakah Unknown Source
Ebeko Krummel-Garbuna-Welcker Raoul Island Unnamed
Ebulobo Kuchinoerabujima Rasshua Unnamed
Egon Kurikomayama Raung Veniaminof
Ekarma Kusatsu-Shiranesan Redoubt Villarrica
Epi Kverkfjoll Reventador West Mata
Erebus Lamington Reykjanes White Island
Erta Ale Lamongan Rincon de la Vieja Witori
Etna Langila Rinjani Wolf
Etorofu-Yakeyama [Grozny Group] Lanin Ritter Island Yasur
Eyjafjallajokull Lascar Rotorua Zaozan [Zaosan]
Fernandina Lateiki Ruang Zavodovski
Fogo Lengai, Ol Doinyo Ruapehu Zhupanovsky
Fonualei Leroboleng Ruiz, Nevado del Zubair Group
Fournaise, Piton de la Lewotobi Sabancaya
Fourpeaked Lewotolo Sakar
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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.

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.)

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URL https://volcano.si.edu/reports_weekly.cfm
Contact: USGS Web Team
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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)