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Smithsonian / USGS Weekly Volcanic Activity Report

You are currently viewing Archived reports for the week of 24 August-30 August 2005.


















 Activity for the week of 24 August-30 August 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
Chiginagak United States New
Santa Ana El Salvador New

Anatahan Mariana Islands (USA) Ongoing
Barren Island Andaman Islands (India) Ongoing
Cleveland Chuginadak Island (USA) Ongoing
Colima Mexico Ongoing
Galeras Colombia Ongoing
Karymsky Eastern Kamchatka (Russia) Ongoing
Kilauea Hawaiian Islands (USA) Ongoing
Langila New Britain (Papua New Guinea) Ongoing
Manam Papua New Guinea Ongoing
Mayon Luzon (Philippines) Ongoing
Rabaul New Britain (Papua New Guinea) Ongoing
Sheveluch Central Kamchatka (Russia) Ongoing
Soufriere Hills Montserrat Ongoing
St. Helens United States Ongoing
Tungurahua Ecuador Ongoing


New Activity / Unrest


Volcano index photo  Chiginagak  | United States  | 57.135°N, 156.99°W  | Elevation 2221 m

AVO reported that a 400-m-wide "melt-water lake" formed in the snow-and-ice filled summit crater of Chiginagak sometime after the previous observation in August 2004. Earlier this summer, the southern crater rim of Chiginagak was breached, allowing a portion of the lake to drain. The resulting lahar left a deposit on a glacier draining the crater to the S and caused flooding of 1-2 m above normal at Indecision Creek. The breach in the crater rim and the ensuing lahar probably occurred in July 2005; there were reports from a nearby lodge at this time of strong sulfur smells and cloudy, yellowish water in the Indecision Creek drainage. There were no indications that an eruption is imminent or that this event is necessarily precursory to an eruption. Chiginagak is not seismically monitored, so AVO did not assign it a Concern Color Code.

Source: US Geological Survey Alaska Volcano Observatory (AVO)



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

SNET reported a significant increase in seismic activity at Santa Ana (also called Ilamatepec) on the night of 27 August. A cluster of 17 volcano-tectonic earthquakes were recorded, with four located S of the volcano. Afterwards, continuous high-frequency tremor was recorded until at least 30 August. Observations made on 29 August revealed incandescent rocks in the fumarole field. The incandescence was due to the hot gases emitted from the fumaroles heating the rocks. A significant increase in sulfur-dioxide emission was recorded, and gas-and-steam plumes rose 500-1,000 m above the volcano's crater (or 9,400-11,000 ft a.s.l.). As a safety measure, access to the volcano's crater was restricted to visitors.

Prior to the current increase in activity, strong degassing had been measured at the volcano since June 2004. An ash emission occurred on 16 June 2005, and a slight increase in seismicity and a significant increase in gas emission was measured from 27 July until at least 30 August.

Source: Servicio Nacional de Estudios Territoriales (SNET)



Ongoing Activity


Volcano index photo  Anatahan  | Mariana Islands (USA)  | 16.35°N, 145.67°E  | Elevation 790 m

During 24-29 August, eruptive activity continued at Anatahan with ash plumes rising to a maximum height of ~6.7 km (22,000 ft) a.s.l. on the 25th. Volcanic tremor and sporadic long-period earthquakes continued to occur at the volcano. Seismic data were not available after 27 August around 0205 when the seismic station on Anatahan went off line.

Source: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program



Volcano index photo  Barren Island  | Andaman Islands (India)  | 12.278°N, 93.858°E  | Elevation 354 m

A plume from Barren Island was visible on satellite imagery on 25 August at a height of ~4.6 km (15,000 ft) a.s.l. Plumes were visible at a height of ~3 km (10,000 ft) a.s.l. on 29 and 30 August according to a pilot report and satellite imagery, respectively. All plumes drifted E. The current eruption began on 28 May.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)



Volcano index photo  Cleveland  | Chuginadak Island (USA)  | 52.825°N, 169.944°W  | Elevation 1730 m

AVO reduced the Concern Color Code at Cleveland from Yellow to "Not Assigned" on 27 August because there had been no evidence of activity at the volcano since a thermal feature was observed on satellite imagery on 11 August. Cleveland does not have a real-time seismic network; volcanoes without seismic networks are not assigned a color code of Green because without the seismic data, AVO has no definitive information that the level of activity of the volcano is at background.

Source: US Geological Survey Alaska Volcano Observatory (AVO)



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

During 24-29 August, several small explosions occurred at Colima. Due to the threat of lahars forming on the volcano's flanks, Universidad de Colima advised avoiding the ravines of La Lumbre, San Antonio, Monte Grande (in Colima state), and La Arena (in Jalisco state).

Source: Centro Universitario de Estudios e Investigaciones de Vulcanologia - Universidad de Colima



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

Volcano-tectonic earthquakes that began at Galeras around 19 August continued through 29 August. The earthquakes occurred at depths of 5-8 km and reached M 4.6. No surficial changes were observed at the volcano.

Source: Servicio Geológico Colombiano (SGC)



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

Seismicity was above background levels at Karymsky during 19-26 August. Based on interpretations of seismic data, ash-and-gas plumes may have risen to 5.5 km (18,000 ft) a.s.l. On 22 August, three ash plumes reached heights around 3-4 km (9,800-13,100 ft) a.s.l. and extended ~130 km E. 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 25-29 August, lava from Kilauea entered the sea at the East Lae`apuki area, and surface lava flows were visible on the Pulama Pali fault scarp and the coastal flat. Background volcanic tremor was around normal levels at Kilauea's summit. Volcanic tremor was at moderate levels at Pu`u `O`o. Small periods of inflation and deflation occurred at the volcano during the report period.

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

RVO reported that during 22-28 August, modest eruptive activity was observed at Langila's Crater 2. Occasional forceful emissions of ash produced plumes that rose ~1 km above the crater (or 7,600 ft a.s.l.) on 22 and 25 August, but reached only several hundred meters after that. The ash plumes drifted N and NW resulting in fine ashfall in downwind areas, including the town of Kilenge. Seismicity was at low levels, consisting mainly of low-frequency earthquakes. The Darwin VAAC reported that a plume was visible on satellite imagery on 30 August extending NNW.

Sources: Rabaul Volcano Observatory (RVO), Darwin Volcanic Ash Advisory Centre (VAAC)



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

Mild eruptive activity continued at Manam during 22-28 August, with occasional emissions of weak-to-moderate ash plumes on several days. Ash clouds emitted on 22 and 26 August rose several hundred meters above the volcano's crater and drifted NW, depositing ash in areas between the towns of Jogari and Kuluguma, and beyond to Boisa Island. Manam remained at Alert Level " Stage 1."

Source: Rabaul Volcano Observatory (RVO) via the Darwin Volcanic Ash Advisory Center



Volcano index photo  Mayon  | Luzon (Philippines)  | 13.257°N, 123.685°E  | Elevation 2462 m

PHIVOLCS reported on 23 August that an aerial survey of Mayon conducted on 17 August revealed that lava had accumulated within the volcano's summit crater. The lava dome was extruding very slowly and the volume of lava was contained within the crater. PHIVOLCS warned that the volcano remains at Alert Level 2, and that people cannot enter the Permanent Danger Zone of 6 km radius around the volcano.

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)



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

During 22-28 August, ash emissions continued at Rabaul caldera's active Tavurvur cone. Ash plumes rose 800-1,500 m above the volcano (or 4,900- 7,200 ft a.s.l.) and drifted N and NW, depositing ash on the eastern part of Rabaul Town and beyond. Seismicity was at moderate-to-high levels, with most earthquakes associated with ash emissions and explosions. The deformation trend generally reflected uplift.

Source: Rabaul Volcano Observatory (RVO) via the Darwin Volcanic Ash Advisory Center



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

Growth of Shiveluch's lava dome continued during 19-26 August. During the report period, about ten shallow earthquakes were recorded, a large thermal anomaly was visible on satellite imagery, and fumarolic activity occurred. A photo taken by Yu Demyanchuk on 19 August showed a new viscous lava flow emitted from the lava dome. The volcano remained at Concern Color Code Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



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

Volcanic and seismic activity at Soufrière Hills remained at elevated levels during 19-26 August. During the report week, there was little ash venting and the daily sulfur-dioxide flux averaged 900 metric tons per day (t/d), above the long-term eruption average of 500 t/d.

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 24-29 August accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. Growth of the lava dome continued to spawn rockfalls. 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 24-29 August, volcanic activity at Tungurahua remained at low levels with small emissions of steam, gas, and variable ash content. On 25 August, ash fell in the towns of Bilbao (8 km W of the volcano) and Cusúa (NW of the volcano).

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)



Weekly Reports Archive

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Agung Fuego Little Sitkin San Cristobal
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Bamus Hunga Tonga-Hunga Ha'apai Monowai Soufriere Hills
Banda Api Ibu Montagu Island Soufriere St. Vincent
Bardarbunga Ijen Moyorodake [Medvezhia] South Sarigan Seamount
Barren Island Iliamna Mutnovsky Spurr
Batur Iliwerung Myojinsho St. Helens
Bezymianny Inielika Nabro Stromboli
Bogoslof Ioto Negra, Sierra Sulu Range
Brava Iya Negro, Cerro Sumbing
Bristol Island Izu-Torishima Nightingale Island Sundoro
Bulusan Jackson Segment Nishinoshima Suretamatai
Calbuco Kaba Nisyros Suwanosejima
Callaqui Kadovar Novarupta Taal
Cameroon Kambalny NW Rota-1 Tair, Jebel at
Campi Flegrei del Mar di Sicilia Kanaga Nyamuragira Takawangha
Cayambe Kanlaon Nyiragongo Talang
Cereme Karangetang Okataina Tambora
Chachadake [Tiatia] Karkar Okmok Tanaga
Chaiten Karthala Ontakesan Tandikat-Singgalang
Chiginagak Karymsky Oraefajokull Tangkoko-Duasudara
Chikurachki Kasatochi Osorno Tangkuban Parahu
Chiles-Cerro Negro Katla Pacaya Tara, Batu
Chillan, Nevados de Kavachi Pagan Telica
Chirinkotan Kelimutu Palena Volcanic Group Tenerife
Chirpoi Kelut Paluweh Tengger Caldera
Cleveland Kerinci Panarea Three Sisters
Colima Ketoi Papandayan Tinakula
Colo Kharimkotan Parker Tofua
Concepcion Kick 'em Jenny Pavlof Tokachidake
Copahue Kikai Peuet Sague Tolbachik
Cotopaxi Kilauea Pinatubo Toliman
Cuicocha Kirishimayama Planchon-Peteroa Tongariro
Cumbal Kizimen Poas Tungurahua
Dabbahu Klyuchevskoy Popocatepetl Turrialba
Dempo Kolokol Group Puyehue-Cordon Caulle Ubinas
Descabezado Grande Korovin Rabaul Ulawun
Dieng Volcanic Complex Koryaksky Raikoke Unknown Source
Dukono Krakatau Ranakah Unnamed
Ebeko Krummel-Garbuna-Welcker Raoul Island Unnamed
Ebulobo Kuchinoerabujima Rasshua Veniaminof
Egon Kurikomayama Raung Villarrica
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Erta Ale Lamongan Rinjani Wolf
Etna Langila Ritter Island Yasur
Etorofu-Yakeyama [Grozny Group] Lanin Rotorua Zaozan
Eyjafjallajokull Lascar Ruang Zavodovski
Fernandina Lateiki Ruapehu Zhupanovsky
Fogo Lengai, Ol Doinyo Ruiz, Nevado del Zubair Group
Fonualei Leroboleng Sabancaya
Fournaise, Piton de la Lewotobi Sakar
Fourpeaked Lewotolo Salak
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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)