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Smithsonian / USGS Weekly Volcanic Activity Report

You are currently viewing Archived reports for the week of 11 August-17 August 2004.


















 Activity for the week of 11 August-17 August 2004

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
Piton de la Fournaise Reunion Island (France) New

Fuego Guatemala Ongoing
Kikai Japan Ongoing
Kilauea Hawaiian Islands (USA) Ongoing
Santa Maria Guatemala Ongoing
Semeru Eastern Java (Indonesia) Ongoing
Sheveluch Central Kamchatka (Russia) Ongoing
Soufriere Hills Montserrat Ongoing
Spurr United States Ongoing
Tungurahua Ecuador Ongoing
Ulawun New Britain (Papua New Guinea) Ongoing
Veniaminof United States Ongoing


New Activity / Unrest


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

INGEOMINAS reported that volcanic and seismic activity increased at Galeras on 11 August at 2349 when an eruption began that sentan ash-and-gas cloud to an unknown height and generated visible incandescence. According to the Washington VAAC, satellite imagery showed that an ash plume rose to a height of ~10.7 km a.s.l. It spread in all directions, but mainly to the NE, E, and SW. Later in the day, a thin plume at a height of ~7.3 km a.s.l drifted SW into northern Ecuador. A plume also drifted NW at a height of ~6.1 km a.s.l. By 1315 ash was no longer visible on satellite imagery. Fine ash was deposited in villages near the volcano including, La Florida (~10 km NW of the volcano), Nariño, Sandoná, and Consacá, and farther afield in Ancuya, Linares, and Sotomayor (~ 40 km NW of the volcano).

News articles reported that ~230 families were evacuated mainly from the volcano's N flank. Ash contaminated potable water in some villages, impacted farm animal's health, and left hundreds of dead fish floating in rivers. The village of La Florida was most strongly impacted by the eruption. On 16 August, ash emissions continued, depositing ash in several villages. A thin plume was visible on satellite imagery extending ~75 km NW.

Sources: Servicio Geológico Colombiano (SGC), Washington Volcanic Ash Advisory Center (VAAC), El Pais, El Spectador



Volcano index photo  Piton de la Fournaise  | Reunion Island (France)  | 21.244°S, 55.708°E  | Elevation 2632 m

An eruption began at Piton de la Fournaise on 13 August after an increase in seismicity during 9-11 August. On the 13th, fissures that opened on the upper part of the Dolomieu crater emitted 2- to 3-km-long lava flows that traveled toward the sea.

Source: Société Volcanologique Européenne



Ongoing Activity


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

During 11-16 August, dozens of weak-to-moderate explosions occurred at Fuego. The explosions expelled lava blocks to ~75 m above the crater and plumes rose to a maximum height of 1.2 km above the crater. Avalanches of incandescent volcanic material traveled to the mouths of several ravines on the volcano's flanks.

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



Volcano index photo  Kikai  | Japan  | 30.793°N, 130.305°E  | Elevation 704 m

Based on information from JMA, the Tokyo VAAC reported that an eruption at Kikai around 1105 on 13 August produced a plume to a height of ~1.2 km a.s.l. The plume drifted NW.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)



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

During 11-17 August surface lava flow were visible on Pulama pali, and the vents in the crater of Pu`u `O`o were incandescent. Lava had not entered the sea since 4 August. Seismicity was weak beneath Kilauea's summit, and tremor was at moderate-to-high levels at Pu`u `O`o. There were periods of small inflation and deflation.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)



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

During 11-16 August several explosions occured at Santa María's Santiaguito lava-dome complex, producing ash plumes to ~1 km above the volcano. Avalanches of lava blocks and ash traveled S down Caliente cone.

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



Volcano index photo  Semeru  | Eastern Java (Indonesia)  | 8.108°S, 112.922°E  | Elevation 3657 m

A pilot reported to the Darwin VAAC that on 10 August ash from Semeru was at a height of ~6.1 km a.s.l. According to a news article, people were temporarily banned from climbing the volcano.

Sources: ABC News - Australian Broadcasting Corporation, Darwin Volcanic Ash Advisory Centre (VAAC)



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

During 6-13 August, seismicity was above background levels at Shiveluch, with weak earthquakes occurring 0-5 km beneath the active dome. On several days gas-and-steam plumes rose to a maximum height of ~2.9 km a.s.l. Shiveluch 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 low levels during 6-13 August. The seismic network recorded one hybrid earthquake and three rockfalls. The sulfur-dioxide flux varied between about 125 and 300 metric tons per day, averaging 200 metric tons. Ground deformation data from July suggested a reversal in trend from shortening between stations across the volcano to slight extension.

Source: Montserrat Volcano Observatory (MVO)



Volcano index photo  Spurr  | United States  | 61.299°N, 152.251°W  | Elevation 3374 m

Elevated levels of seismicity continued at Spurr during 6-17 August, as it has for several weeks. On 12 August a pilot reported ash in the Hayes River valley N of Spurr. However, AVO found no evidence of an eruption in seismic or satellite data, subsequent pilot reports, or from visual observations. Spurr remained at Concern Color Code Yellow.

Source: US Geological Survey Alaska Volcano Observatory (AVO)



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

Volcanic and seismic activity at Tungurahua remained at low levels during 11-17 August. Emissions of gas, steam, and ash rose to ~1.5 km above the volcano and a small number of long-period earthquakes occurred.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)



Volcano index photo  Ulawun  | New Britain (Papua New Guinea)  | 5.05°S, 151.33°E  | Elevation 2334 m

According to the Darwin VAAC, a thin plume emitted from Ulawun was visible on satellite imagery at a height of ~3 km a.s.l. on 14 and 15 August.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)



Volcano index photo  Veniaminof  | United States  | 56.17°N, 159.38°W  | Elevation 2507 m

During 6-13 August, frequent small ash-and-steam emissions from Veniaminof were visible on the web camera in Perryville and confirmed by AVO geologists working in the area. The emissions did not exceed a height of 3 km a.s.l. and were similar to those commonly observed in the past 2 months. Bursts of volcanic tremor recorded intermittently on 17 August were probably associated with low-level, short-term ash emissions. Veniaminof remained at Concern Color Code Yellow.

Source: US Geological Survey Alaska Volcano Observatory (AVO)



Weekly Reports Archive

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