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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 13 April-19 April 2011
Name Country Volcanic Region Eruption Start Date Report Status
Bezymianny Russia Eastern Kamchatka Volcanic Arc 2024 Dec 24 New
Kilauea United States Hawaiian-Emperor Hotspot Volcano Group 2024 Dec 23 New
Taal Philippines Luzon Volcanic Arc 2024 Apr 12 New
Aira Japan Ryukyu Volcanic Arc 2017 Mar 25 Continuing
Bulusan Philippines Eastern Philippine Volcanic Arc Continuing
Karymsky Russia Eastern Kamchatka Volcanic Arc Continuing
Kirishimayama Japan Ryukyu Volcanic Arc Continuing
Kizimen Russia Eastern Kamchatka Volcanic Arc Continuing
Planchon-Peteroa Chile Southern Andean Volcanic Arc Continuing
Sheveluch Russia Eastern Kamchatka Volcanic Arc 1999 Aug 15 Continuing
Soufriere Hills United Kingdom Lesser Antilles 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 21,226 individual reports over 1,268 weeks (average of 17 per week) on 339 different volcanoes.

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


Download Smithsonian / USGS Weekly Volcanic Activity Report Network RSS Feed

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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Download Smithsonian/USGS Weekly Volcanic Activity Report Network Link Download Smithsonian / USGS Weekly Volcanic Activity Report Network Link

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 Bezymianny
KVERT reported that seismic data suggesting a strong explosive eruption from Bezymianny began at 0820 on 14 April and lasted for 40 minutes. The Aviation Color Code level was raised to Red. Ash fell in Krasny Yar (45 km to the NNW). Cloud cover prevented observations. No activity was observed in satellite imagery; ash plumes may have been below meteorological clouds observed around 8 km a.s.l. The Aviation Color Code level was lowered to orange the next day.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Kilauea
During 13-19 April, HVO reported that activity at Kilauea continued from the summit caldera and the east rift zone. The level of the circulating lava-pool surface in a deep pit was approximately 100 m below the Halema'uma'u crater floor, and periodically rose and drained. A gas plume from the vent drifted NE and SW, and deposited very small amounts of ash nearby. On 16 April two collapses of interior vent walls covered most of the molten surface with rock debris and generated brown plumes. At Pu'u 'O'o crater, central sources continuously erupted lava within a perched lake that was approximately half the diameter of the crater floor. The lava level fluctuated within the lake walls and episodically overflowed the rim.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Report for Taal
During 12-19 April, PHIVOLCS reported that between 6 and 21 daily volcanic earthquakes at Taal were detected by the seismic network. Some of the earthquakes were felt by nearby residents. Results of a ground deformation survey conducted around Volcano Island during 5-11 April showed that the edifice was slightly inflated compared to a survey from early February. The Alert Level remained at 2 (on a scale of 0-5). According to news articles, the number of people that had evacuated from around Taal rose to 1,375.
Sources: Agence France-Presse (AFP), Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Report for Aira
Based on information from JMA and pilot observations, the Tokyo VAAC reported that during 13-19 April explosions from Sakura-jima mostly generated ash plumes that rose to altitudes of 1.5-3 km (5,000-10,000 ft) a.s.l. and drifted S, SE, and E.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Report for Bulusan
During 12-19 April, PHIVOLCS reported that up to six daily volcanic earthquakes at Bulusan were detected by the seismic network. Although cloud cover mostly prevented observations of the summit area, steam was observed rising from NW and SE thermal vents during 15 and 17-18 April. Based on notices from the Manila airport (RPLL) and reports from PHIVOLCS, the Tokyo VAAC reported that ash was observed on 13 and 15 April.
Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Report for Karymsky
KVERT reported moderate seismic activity at Karymsky during 8-15 April. Seismic data indicated that possible ash plumes rose to an altitude of 4.7 km (15,400 ft) a.s.l. A thermal anomaly was detected in satellite imagery during 7-10 April. The Aviation Color Code remained at Orange. Based on information from the Yelizovo Airport (UHPP), the Tokyo VAAC reported that ash plumes rose to altitudes of 5.5-11.9 km (18,000-39,000 ft) a.s.l. and drifted SW on 18 April.
Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Kirishimayama
Based on notifications from JMA, the Tokyo VAAC reported that on 18 April an ash plume from Kirishima's Shinmoe-dake (Shinmoe peak) rose to an altitude of 3.7 km (12,000 ft) a.s.l. and drifted SE.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Report for Kizimen
KVERT reported that during 8-15 April seismicity from Kizimen was high, with many shallow volcanic earthquakes and volcanic tremor continuing to be detected. Satellite images showed a large bright thermal anomaly daily on the volcano. Ash plumes drifted SE as far as 255 km during 7-11 April. The Aviation Color Code remained at Orange.

Based on analyses of satellite imagery, the Tokyo VAAC reported that a possible eruption on 16 April produced a plume that rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted NW. Subsequent images that day showed continuing ash emissions.
Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Planchon-Peteroa
Based on a SIGMET notice, the Buenos Aires VAAC reported that on 17 April an ash plume from Planchón-Peteroa rose to an altitude of 4.6 km (15,000 ft) a.s.l. and drifted NE. Ash was not observed in satellite imagery.
Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
Report for Sheveluch
KVERT reported that during 1-7 April seismic data at Shiveluch indicated that possible ash plumes rose to an altitude of 4.6 km (15,100 ft) a.s.l. On 8 April gas-and-steam plumes were observed from the ground and a thermal anomaly over the lava dome was observed in satellite imagery. Ash plumes drifted 33 km NW on 11 April. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Soufriere Hills
MVO reported that during 8-15 April activity at the Soufrière Hills lava dome was at a low level. On 11 April a piece of the E side of the lava dome broke off and generated a small pyroclastic flow that traveled at most 1.5 km down the Tar River valley to the E. A resulting ash plume drifted W over uninhabited areas. The Hazard Level remained at 3.
Source: Montserrat Volcano Observatory (MVO)