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Smithsonian / USGS Weekly Volcanic Activity Report

Weekly Volcanic Activity Map

You are currently viewing Archived reports for the week of 31 March-6 April 2004.


















 Activity for the week of 31 March-6 April 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
Epi Vanuatu New

Ambrym Vanuatu Ongoing
Anatahan Mariana Islands (USA) Ongoing
Dukono Halmahera (Indonesia) Ongoing
Fuego Guatemala Ongoing
Karymsky Eastern Kamchatka (Russia) Ongoing
Kilauea Hawaiian Islands (USA) Ongoing
Santa Maria Guatemala Ongoing
Sheveluch Central Kamchatka (Russia) Ongoing
Soufriere Hills Montserrat Ongoing
Tungurahua Ecuador Ongoing
Yasur Vanuatu Ongoing


New Activity / Unrest


Volcano index photo  Epi  | Vanuatu  | 16.68°S, 168.37°E  | Elevation 833 m

According to a report from John Seach, an eruption at East Epi caldera in early March marked the first reported activity at the largely undersea caldera since 1988.

Source: Volcano Live



Ongoing Activity


Volcano index photo  Ambrym  | Vanuatu  | 16.25°S, 168.12°E  | Elevation 1334 m

According to a report from John Seach, during March an active lava lake was present in Ambrym's Mbwelesu crater.

Source: Volcano Live



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

A seismic swarm began beneath Anatahan on 31 March. During 31 March to at least 4 April, volcanic seismicity was at its highest level since the eruption of May-June 2003, with events as large as M 2.5. The earthquakes were usually followed by tremor-like signals that scientists believed indicated steam and/or ash emissions to altitudes well below 1 km. As of 6 April, the seismic swarm continued to intensify slowly.

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



Volcano index photo  Dukono  | Halmahera (Indonesia)  | 1.693°N, 127.894°E  | Elevation 1229 m

During 31 March to 6 April, ash clouds emitted from Dukono were sometimes visible on satellite imagery at a height of ~3 km a.s.l.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)



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

During 31 March to 6 April, weak-to-moderate explosions continued at Fuego. The highest rising ash plume produced from the explosions reached ~1.2 km above the volcano on 5 April and drifted SSE. Lahars flowed down Seca Ravine on 30 March, and near the village of Sangre de Cristo on 3 April. During the report period, incandescent avalanches of volcanic material traveled down several ravines, including Santa Teresa, Ceniza, and Taniluyá.

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

Seismicity remained above background levels at Karymsky during 26 March to 2 April, with 240-380 shallow earthquakes occurring per day. Based on interpretations of seismic data, plumes from ash-and-gas explosions may have reached 3.5 km a.s.l. every day. On 30 March ash deposits were seen extending SE and SW from the volcano. 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 31 March to 5 April, surface lava flows were visible at the southern part of Kilauea's rootless-shield complex, which is along the Mother's Day lava tube several hundred meters S of Pu`u `O`o cone. Incandescence was also visible from several vents in the crater of Pu`u `O`o. Seismicity was at low levels at Kilauea's summit, and tremor at Pu`u `O`o remained moderate. During the report period, there were episodes of inflation and deflation at Uwekahuna and Pu`u `O`o.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)



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

During 31 March to 6 April, weak-to-moderate explosions continued at Santa Maria's Santiaguito lava-dome complex, producing plumes to 1.3 km above the volcano. Several partial lava-dome collapses produced avalanches down the volcano's S flank. A strong explosion on 1 April at 1706 caused a partial lava-dome collapse and produced a pyroclastic flow that traveled ~4 km SW toward the Nimá II river.

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



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

According to KVERT, during 26 March to 2 April seismicity was above background levels at Shiveluch. About 14 shallow earthquakes up to M 2 occurred during 25 and 28-31 March. Based on interpretations of seismic data, 15 ash-and-gas explosions may have produced plumes to 5 km a.s.l. during 25 and 28-31 March. Shiveluch remained at Concern Color Code Orange.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), RIA Novosti, Itar-Tass News



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

Seismic and volcanic activity were at moderate levels at Soufrière Hills during 26 March to 2 April. Seismicity was dominated by near-continuous low-to-moderate tremor. Vigorous steam venting was visible from several areas of the crater, but no new lava-dome growth occurred. The sulfur-dioxide flux remained at moderate levels.

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



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

During 30 March to 3 April, volcanic activity at Tungurahua was at relatively low levels, but emissions of steam and ash occurred and incandescence was visible in the crater. On 4 April at 1902 an explosion produced a plume containing a moderate amount of ash that rose to 800 m above the crater.

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



Volcano index photo  Yasur  | Vanuatu  | 19.532°S, 169.447°E  | Elevation 361 m

According to a report from John Seach, eruptive activity at Yasur continued at "normal" levels during March, with an average of 500 explosions occurring per day.

Source: Volcano Live



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Agung Concepcion Ijen Llaima Peuet Sague Spurr
Ahyi Copahue Iliamna Loihi Pinatubo St. Helens
Aira Cotopaxi Iliwerung Lokon-Empung Planchon-Peteroa Stromboli
Akan Cuicocha Inielika Lopevi Poas Sulu Range
Alaid Cumbal Ioto Machin Popocatepetl Sumbing
Alu-Dalafilla Dabbahu Irazu Makian Puyehue-Cordon Caulle Sundoro
Ambae Dempo Iya Makushin Rabaul Suretamatai
Ambang Descabezado Grande Izu-Torishima Maly Semyachik Raikoke Suwanosejima
Ambrym Dieng Volcanic Complex Jackson Segment Manam Ranakah Taal
Anatahan Dukono Kaba Manda Hararo Raoul Island Tair, Jebel at
Antillanca Volcanic Complex Ebeko Kadovar Marapi Rasshua Takawangha
Antuco Ebulobo Kambalny Maroa Raung Talang
Apoyeque Egon Kanaga Martin Redoubt Tambora
Arenal Ekarma Kanlaon Masaya Reventador Tanaga
Asamayama Epi Karangetang Maule, Laguna del Reykjanes Tandikat-Singgalang
Askja Erebus Karkar Mauna Loa Rincon de la Vieja Tangkoko-Duasudara
Asosan Erta Ale Karthala Mayon Rinjani Tangkuban Parahu
Augustine Etna Karymsky McDonald Islands Ritter Island Tara, Batu
Avachinsky Etorofu-Yakeyama [Grozny Group] Kasatochi Melimoyu Rotorua Telica
Awu Eyjafjallajokull Katla Merapi Ruang Tenerife
Axial Seamount Fernandina Kavachi Midagahara Ruapehu Tengger Caldera
Azul, Cerro Fogo Kelimutu Misti, El Ruiz, Nevado del Three Sisters
Azumayama Fonualei Kelut Miyakejima Sabancaya Tinakula
Bagana Fournaise, Piton de la Kerinci Momotombo Sakar Tofua
Balbi Fourpeaked Ketoi Monowai Salak Tokachidake
Bamus Fuego Kharimkotan Montagu Island San Cristobal Tolbachik
Banda Api Fujisan Kick 'em Jenny Moyorodake [Medvezhia] San Miguel Toliman
Bardarbunga Fukutoku-Oka-no-Ba Kikai Mutnovsky San Vicente Tongariro
Barren Island Galeras Kilauea Myojinsho Sangay Tungurahua
Batur Galunggung Kirishimayama Nabro Sangeang Api Turrialba
Bezymianny Gamalama Kizimen Negra, Sierra Santa Ana Ubinas
Bogoslof Gamkonora Klyuchevskoy Negro, Cerro Santa Maria Ulawun
Brava Gaua Kolokol Group Nightingale Island Sarigan Unnamed
Bristol Island Gorely Korovin Nishinoshima Sarychev Peak Unnamed
Bulusan Great Sitkin Koryaksky Nisyros Saunders Veniaminof
Calbuco Grimsvotn Krakatau Novarupta Semeru Villarrica
Callaqui Guagua Pichincha Krummel-Garbuna-Welcker NW Rota-1 Semisopochnoi West Mata
Cameroon Guallatiri Kuchinoerabujima Nyamuragira Seulawah Agam Westdahl
Campi Flegrei del Mar di Sicilia Guntur Kurikomayama Nyiragongo Sheveluch Whakaari/White Island
Cayambe Hachijojima Kusatsu-Shiranesan Okataina Shishaldin Witori
Cereme Hakoneyama Kverkfjoll Okmok Simbo Wolf
Chachadake [Tiatia] Heard Lamington Ontakesan Sinabung Yasur
Chaiten Hekla Lamongan Oraefajokull Sinarka Zaozan [Zaosan]
Chiginagak Hierro Langila Osorno Siple Zavodovski
Chikurachki Hokkaido-Komagatake Lanin Pacaya Sirung Zhupanovsky
Chiles-Cerro Negro Home Reef Lascar Pagan Slamet Zubair Group
Chillan, Nevados de Hood Lateiki Palena Volcanic Group Soputan
Chirinkotan Huaynaputina Lengai, Ol Doinyo Paluweh Sorikmarapi
Chirpoi Hudson, Cerro Leroboleng Panarea Sotara
Cleveland Huila, Nevado del Lewotobi Papandayan Soufriere Hills
Colima Hunga Tonga-Hunga Ha'apai Lewotolo Parker Soufriere St. Vincent
Colo Ibu Little Sitkin Pavlof South Sarigan Seamount
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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 profile page and to the complete Weekly Report for that week. This feature was first made available on 1 April 2009.

 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.)

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)