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Smithsonian / USGS Weekly Volcanic Activity Report

Weekly Volcanic Activity Map

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 and averaging 16 reported volcanoes, this is not a comprehensive list of all eruptions this week, but rather a summary of activity that meet criteria discussed in the "Criteria and Disclaimers" section below.

Volcanic activity reported here is preliminary and subject to change. Carefully reviewed, detailed narratives over longer time periods are published as reports of the Bulletin of the Global Volcanism Network available through volcano profile pages.

Smithsonian / USGS Weekly Volcanic Activity Report for the week of 19 May-25 May 2004
Name Country Volcanic Region Eruption Start Date Report Status
Awu Indonesia Sangihe Volcanic Arc New
Sirung Indonesia Sunda Volcanic Arc New
Aira Japan Ryukyu Volcanic Arc 2017 Mar 25 Continuing
Anatahan United States Mariana Volcanic Arc Continuing
Dukono Indonesia Halmahera Volcanic Arc 1933 Aug 13 Continuing
Fuego Guatemala Central America Volcanic Arc 2002 Jan 4 Continuing
Kilauea United States Hawaiian-Emperor Hotspot Volcano Group 2024 Dec 23 Continuing
Nyamulagira DR Congo Albertine Rift Volcanic Province 2018 Apr 14 Continuing
Nyiragongo DR Congo Albertine Rift Volcanic Province 2002 May 17 (?) Continuing
Piton de la Fournaise France Reunion Hotspot Volcano Group Continuing
Reventador Ecuador Northern Andean Volcanic Arc 2008 Jul 27 Continuing
Santa Maria Guatemala Central America Volcanic Arc 1922 Jun 22 Continuing
Semeru Indonesia Sunda Volcanic Arc 2017 Jun 6 Continuing
Shishaldin United States Aleutian Ridge Volcanic Arc Continuing
Soufriere Hills United Kingdom Lesser Antilles Volcanic Arc Continuing
Tungurahua Ecuador Northern Andean Volcanic Arc Continuing
Veniaminof United States Aleutian Ridge Volcanic Arc Continuing
All times are local unless otherwise stated.
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 21,469 individual reports over 1,278 weeks (average of 17 per week) on 339 different volcanoes.

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Adams Cotopaxi Ijen Lewotobi Peuet Sague St. Helens
Agung Cuicocha Iliamna Lewotolok Pinatubo Stromboli
Ahyi Cumbal Iliwerung Little Sitkin Planchon-Peteroa Sulu Range
Aira Dabbahu Inielika Llaima Poas Sumbing
Akan Davidof Ioto Lokon-Empung Popocatepetl Sumisujima
Alaid Dempo Irazu Lonquimay Purace Sundoro
Alu-Dalafilla Descabezado Grande Iwatesan Lopevi Puyehue-Cordon Caulle Suoh
Ambae Dieng Volcanic Complex Iya Machin Rabaul Suretamatai
Ambang Dukono Izu-Torishima Makushin Raikoke Suwanosejima
Ambrym East Epi Jackson Segment Maly Semyachik Ranakah Taal
Anatahan Ebeko Kaba Manam Raoul Island Tair, Jebel at
Aniakchak Ebulobo Kadovar Manda Hararo Rasshua Takawangha
Antillanca Volcanic Complex Edgecumbe Kaitoku Seamount Marapi Raung Talang
Antuco Egon Kama'ehuakanaloa Maroa Redoubt Tambora
Apoyeque Ekarma Kambalny Martin Reventador Tanaga
Arenal Eldey Kanaga Masaya Reykjanes Tandikat-Singgalang
Asamayama Erebus Kanlaon Matthew Island Rincon de la Vieja Tangkoko-Duasudara
Askja Erta Ale Karangetang Maule, Laguna del Rinjani Tangkuban Parahu
Asosan Etna Karkar Mauna Loa Ritter Island Tara, Batu
Atka Volcanic Complex Etorofu-Yakeyama [Grozny Group] Karthala Mayon Rotorua Ta'u
Augustine Eyjafjallajokull Karymsky McDonald Islands Ruang Taupo
Avachinsky Fagradalsfjall Kasatochi Melebingoy Ruapehu Telica
Awu Fentale Katla Melimoyu Ruby Tenerife
Axial Seamount Fernandina Katmai Merapi Ruiz, Nevado del Tengger Caldera
Azul, Cerro Fogo Kavachi Midagahara Sabancaya Three Sisters
Azumayama Fonualei Kelimutu Misti, El Sakar Tinakula
Bagana Fournaise, Piton de la Kelud Miyakejima Salak Tofua
Balbi Fourpeaked Kerinci Momotombo San Cristobal Tokachidake
Bamus Fuego Ketoi Monowai San Miguel Tolbachik
Banda Api Fujisan Kharimkotan Montagu Island San Vicente Toliman
Bardarbunga Fukutoku-Oka-no-Ba Kick 'em Jenny Moyorodake [Medvezhia] Sangay Tongariro
Barren Island Galeras Kie Besi Mutnovsky Sangeang Api Trident
Batur Galunggung Kikai Myojinsho Santa Ana Tungurahua
Bezymianny Gamalama Kilauea Nabro Santa Maria Turrialba
Bogoslof Gamkonora Kirishimayama Negra, Sierra Sao Jorge Ubinas
Brava Gareloi Kita-Ioto Negro, Cerro Sarigan Ugashik-Peulik
Bristol Island Gaua Kizimen Nightingale Island Sarychev Peak Ukinrek Maars
Bulusan Gede Klyuchevskoy Nishinoshima Saunders Ulawun
Calbuco Gorely Kolokol Group Nisyros Savo Unnamed
Callaqui Great Sitkin Kolumbo Northern EPR at 9.8°N Semeru Unnamed
Cameroon Grimsvotn Koryaksky Novarupta Semisopochnoi Veniaminof
Campi Flegrei Guagua Pichincha Krakatau NW Rota-1 Seulawah Agam Villarrica
Campi Flegrei del Mar di Sicilia Guallatiri Krummel-Garbuna-Welcker Nyamulagira Sheveluch Vulcano
Cayambe Guntur Krysuvik-Trolladyngja Nyiragongo Shishaldin West Mata
Chachadake [Tiatia] Hachijojima Kuchinoerabujima Ofu-Olosega Simbo Westdahl
Chaiten Hakoneyama Kurikomayama Okataina Sinabung Whakaari/White Island
Chiginagak Heard Kusatsu-Shiranesan Okmok Sinarka Witori
Chikurachki Hekla Kverkfjoll Ontakesan Siple Wolf
Chiles-Cerro Negro Helgrindur La Palma Oraefajokull Sirung Wrangell
Chillan, Nevados de Hierro Lamington Osorno Slamet Yakedake
Chirinkotan Hokkaido-Komagatake Lamongan Pacaya Snaefellsjokull Yasur
Chirpoi Home Reef Langila Pagan Soputan Yellowstone
Ciremai Hood Lanin Palena Volcanic Group Sorikmarapi Yufu-Tsurumi
Cleveland Huaynaputina Lascar Paluweh Sotara Zaozan [Zaosan]
Colima Hudson, Cerro Late Panarea Soufriere Hills Zavodovski
Colo Huila, Nevado del Lateiki Papandayan Soufriere St. Vincent Zhupanovsky
Concepcion Hunga Tonga-Hunga Ha'apai Lengai, Ol Doinyo Pavlof South Sarigan Seamount Zubair Group
Copahue Ibu Lereboleng Pelee Spurr
 News Feeds and Google Placemarks


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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. At the end of each report is a list of the sources used. 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. This feature was first made available on 5 March 2008.



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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 cover longer time periods and are 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)

Report for Awu
DVGHM reported a sudden increase in seismicity at Awu beginning on 16 May when 12 volcanic earthquakes were recorded. In addition, tremor was recorded during 1110-1540. Gas plumes rose ~75 m above the crater that were thicker than earlier in the month, but they did not change color or form clumps. On 18 May, six volcanic earthquakes were recorded and tremor continued. The same day DVGHM raised the Alert Level from 1 to 2. According to news reports, on 21 May hundreds of residents of the villages of Manente, Kolongan, Kendahe, and North Tabukan began to flee due to fears of an eruption.
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Agence France-Presse (AFP), The Jakarta Post
Report for Sirung
According to DVGHM, the news reports of an eruption at Sirung around 13 May were false. There was no activity at the volcano.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Aira
Based on information from JMA, during 19-24 May several explosions at Sakura-jima produced ash clouds. The highest reported ash cloud reached ~2.4 km a.s.l. on 24 May.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Report for Anatahan
During 20-25 May, volcanic activity continued at Anatahan. Explosions every few minutes threw volcanic material hundreds of meters out of the crater, and steam-and-ash emissions probably rose several hundred meters above the volcano. On 25 May satellite imagery showed an ash plume extending at least 5 km NW of the volcano.
Source: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program
Report for Dukono
During 19-25 May, Dukono occasionally emitted ash plumes that were visible on satellite imagery. Plumes rose to heights of ~3 km a.s.l.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Fuego
During 18-21 May, moderate volcanic activity continued at Fuego. Several explosions produced ash plumes, with the highest one reaching ~1.2 km above the volcano on 20 May. On 21 May, avalanches of incandescent volcanic material traveled toward the ravines of Seca (to the W) and Taniluya (to the SW).
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Kilauea
During 19-21 May, the Banana lava flow traveled toward down the Pulama pali toward the sea, reaching within ~200 m of the sea cliff before stopping on the morning of 21 May. Around this time, a few incandescent areas were visible along the flow. During 19-23 May, tremor was at low levels at Kilauea's summit and at moderate levels at Pu`u `O`o. There were small episodes of inflation and deflation at the volcano.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Report for Nyamulagira
The Toulouse VAAC reported that satellite imagery showed a weak eruption of ash at Nyamuragira on 25 May.
Source: Toulouse Volcanic Ash Advisory Centre (VAAC)
Report for Nyiragongo
The Toulouse VAAC reported that satellite imagery showed a weak eruption of Nyiragongo on 21 May. Activity intensified during the evening of 24 May. By the evening of 25 May, the volcano was no longer visible on satellite imagery due to meteorological clouds in the area.
Source: Toulouse Volcanic Ash Advisory Centre (VAAC)
Report for Piton de la Fournaise
The eruptive episode that began at Piton de la Fournaise on 2 May stopped on 18 May. This followed 2 days of high eruptive activity when numerous pahoehoe lava flows and Pele's hair were produced. Around 1550 on the 18th the amount of eruption tremor decreased, completely stopping at 1615 and signaling the eruption's end.
Source: Observatoire Volcanologique du Piton de la Fournaise (OVPF)
Report for Reventador
Strong rain on 15 May caused several lahars to travel down Reventador's flanks. They persisted through 16 May.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Report for Santa Maria
During 18-21 May, weak-to-moderate explosions at Santa María's Santiaguito lava-dome complex produced gas-and-ash plumes that rose to ~1 km above the crater. Many of the moderate explosions were accompanied by avalanches of incandescent volcanic material. On 20 May around 1800 a small partial collapse at the edge of the Caliente lava dome produced an avalanche of incandescent volcanic material to the SW that reached the base of the dome.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Semeru
The Darwin VAAC reported that a thin ash plume from Semeru was visible on satellite imagery on 23 May around 0625. The plume reached a height of ~4.3 km a.s.l. and extended ~110 km SSE.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Shishaldin
During 14-21 May seismic unrest continued at Shishaldin, characterized by weak seismic tremor and small explosions. On 16 May, a pilot reported an ash plume that rose ~300 m above the volcano's summit. Satellite imagery from 17 May showed a vigorous plume emanating from the summit that may have contained small amounts of ash. Shishaldin remained at Concern Color Code Yellow.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Soufriere Hills
Volcanic and seismic activity at Soufrière Hills during 14-21 May remained at low levels. On 21 May intense rainfall produced large mudflows in the Belham Valley. At the peak of the activity, the entire width of the valley floor at Belham Bridge was flooded and standing waves up to 2 m high were observed. The sulfur-dioxide flux was low for most of the report period.
Source: Montserrat Volcano Observatory (MVO)
Report for Tungurahua
During 19-24 May, small-to-moderate emissions of gas, steam, and ash continued at Tungurahua. The highest rising plume reached ~2.5 km above the volcano on 23 May. On the morning of 19 May a mudflow occurred in the Pampas sector, but it did not affect the highway. Strombolian activity was visible in the crater on the evening of 23 May.
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN), Washington Volcanic Ash Advisory Center (VAAC)
Report for Veniaminof
Unrest continued at Veniaminof during 14-21 May, characterized by intermittent volcanic tremor. The tremor was similar to seismic signals recorded the previous month in association with small ash plumes, suggesting that ash bursts continued. A pilot report on 18 May indicated the presence of an ash plume rising to heights of 300-900 m above the volcano's summit and extending ~32 km NE. Veniaminof remained at Concern Color Code Yellow.
Source: US Geological Survey Alaska Volcano Observatory (AVO)