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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 4 July-10 July 2001
Name Location Eruption Start Date Report Status
Mayon Luzon (Philippines) New
Etna Sicily (Italy) 2013 Sep 3 Continuing
Kilauea Hawaiian Islands (USA) 2021 Sep 29 Continuing
Piton de la Fournaise Reunion Island (France) Continuing
Popocatepetl Mexico 2005 Jan 9 Continuing
Semeru Eastern Java (Indonesia) 2014 Apr 1 ± 15 days Continuing
Sheveluch Central Kamchatka (Russia) 1999 Aug 15 Continuing
Soufriere Hills Montserrat Continuing
Tungurahua Ecuador Continuing
All times are local unless otherwise stated.
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 17,408 individual reports over 1,099 weeks (average of 16 per week) on 315 different volcanoes.

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Agung Concepcion Ibu Little Sitkin Peuet Sague Spurr
Ahyi Copahue Ijen Llaima Pinatubo St. Helens
Aira Cotopaxi Iliamna Loihi Planchon-Peteroa Stromboli
Akan Cuicocha Iliwerung Lokon-Empung Poas Sulu Range
Alaid Cumbal Inielika Lopevi Popocatepetl Sumbing
Alu-Dalafilla Dabbahu Ioto Machin Puyehue-Cordon Caulle Sundoro
Ambae Davidof Irazu Makian Rabaul Suretamatai
Ambang Dempo Iya Makushin Raikoke Suwanosejima
Ambrym Descabezado Grande Izu-Torishima Maly Semyachik Ranakah Taal
Anatahan Dieng Volcanic Complex Jackson Segment Manam Raoul Island Tair, Jebel at
Aniakchak Dukono Kaba Manda Hararo Rasshua Takawangha
Antillanca Volcanic Complex Ebeko Kadovar Marapi Raung Talang
Antuco Ebulobo Kambalny Maroa Redoubt Tambora
Apoyeque Egon Kanaga Martin Reventador Tanaga
Arenal Ekarma Kanlaon Masaya Reykjanes Tandikat-Singgalang
Asamayama Epi Karangetang Maule, Laguna del Rincon de la Vieja Tangkoko-Duasudara
Askja Erebus Karkar Mauna Loa Rinjani Tangkuban Parahu
Asosan Erta Ale Karthala Mayon Ritter Island Tara, Batu
Atka Etna Karymsky McDonald Islands Rotorua Telica
Augustine Etorofu-Yakeyama [Grozny Group] Kasatochi Melimoyu Ruang Tenerife
Avachinsky Eyjafjallajokull Katla Merapi Ruapehu Tengger Caldera
Awu Fernandina Katmai Midagahara Ruiz, Nevado del Three Sisters
Axial Seamount Fogo Kavachi Misti, El Sabancaya Tinakula
Azul, Cerro Fonualei Kelimutu Miyakejima Sakar Tofua
Azumayama Fournaise, Piton de la Kelud Momotombo Salak Tokachidake
Bagana Fourpeaked Kerinci Monowai San Cristobal Tolbachik
Balbi Fuego Ketoi Montagu Island San Miguel Toliman
Bamus Fujisan Kharimkotan Moyorodake [Medvezhia] San Vicente Tongariro
Banda Api Fukutoku-Oka-no-Ba Kick 'em Jenny Mutnovsky Sangay Tungurahua
Bardarbunga Galeras Kikai Myojinsho Sangeang Api Turrialba
Barren Island Galunggung Kilauea Nabro Santa Ana Ubinas
Batur Gamalama Kirishimayama Negra, Sierra Santa Maria Ugashik-Peulik
Bezymianny Gamkonora Kizimen Negro, Cerro Sarigan Ukinrek Maars
Bogoslof Gareloi Klyuchevskoy Nightingale Island Sarychev Peak Ulawun
Brava Gaua Kolokol Group Nishinoshima Saunders Unnamed
Bristol Island Gorely Koryaksky Nisyros Savo Unnamed
Bulusan Great Sitkin Krakatau Novarupta Semeru Veniaminof
Calbuco Grimsvotn Krummel-Garbuna-Welcker NW Rota-1 Semisopochnoi Villarrica
Callaqui Guagua Pichincha Krysuvik-Trolladyngja Nyamulagira Seulawah Agam Vulcano
Cameroon Guallatiri Kuchinoerabujima Nyiragongo Sheveluch West Mata
Campi Flegrei del Mar di Sicilia Guntur Kurikomayama Okataina Shishaldin Westdahl
Cayambe Hachijojima Kusatsu-Shiranesan Okmok Simbo Whakaari/White Island
Chachadake [Tiatia] Hakoneyama Kverkfjoll Ontakesan Sinabung Witori
Chaiten Heard La Palma Oraefajokull Sinarka Wolf
Chiginagak Hekla Lamington Osorno Siple Yasur
Chikurachki Helgrindur Lamongan Pacaya Sirung Zaozan [Zaosan]
Chiles-Cerro Negro Hierro Langila Pagan Slamet Zavodovski
Chillan, Nevados de Hokkaido-Komagatake Lanin Palena Volcanic Group Snaefellsjokull Zhupanovsky
Chirinkotan Home Reef Lascar Paluweh Soputan Zubair Group
Chirpoi Hood Lateiki Panarea Sorikmarapi
Ciremai Huaynaputina Lengai, Ol Doinyo Papandayan Sotara
Cleveland Hudson, Cerro Leroboleng Parker Soufriere Hills
Colima Huila, Nevado del Lewotobi Pavlof Soufriere St. Vincent
Colo Hunga Tonga-Hunga Ha'apai Lewotolok Pelee South Sarigan Seamount
 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 Mayon
A decrease in volcanic activity began on 3 July that led PHIVOLCS to reduce the Alert Level on 4 July from 5 (hazardous eruption in progress) to 4 (hazardous eruption imminent). In comparison to the previous week SO2 emissions decreased, seismic activity was lower, the rate of inflation of the volcano's edifice decreased, and there was no ash in the steam clouds that emanated from the crater. Alert Level 4 was maintained due to the possibility of minor ash puffs and secondary explosions caused by the contact of water with the voluminous hot lava. The extended danger zone was reduced from 8 km to 7 km in radius. On 4 July ~20,000 people who were evacuated from the most distal parts of the evacuation zone were permitted to return to their homes.
Sources: Philippine Institute of Volcanology and Seismology (PHIVOLCS), Associated Press
Report for Etna
After 4.5 days of low-level activity at Etna, an eruption occurred at Southeast Crater on 4 July that lasted for approximately 5 hours. The episode began with lava flowing from the NNE vent towards the NE and SSE and was followed by modest Strombolian activity. At the summit vent powerful explosions sent an incandescent fountain up to 400-500 m high and several large magma bubbles burst sending fragments to the base of the Southeast Crater cone. A dense tephra column rose from the summit vent and deposited ash on Etna's SE flank. Fine ash and 3- to 5-mm-long Pele's hair fell as far as the town of Acireale, ~20 km SE of the volcano. On 7 July another eruptive episode lasted for approximately 1 hour at Southeast Crater. The episode consisted of lava flows and the eruption of black ash and small volcanic blocks that reached a height of ~1 km above the volcano and drifted to the E.
Sources: Italy's Volcanoes, Etna Volcan Sicilien (Charles Rivière)
Report for Kilauea
Small surface flows of pahoehoe lava were located in the W and E branches of the lava flow field. Like the previous week, lava poured into the sea at the E Kupapa`u ocean entry. Generally, weak, steady tremor and related long-period earthquakes continued beneath Kilauea's caldera. Tremor remained weak to moderate near Pu`u `O`o and seismicity was at normal levels elsewhere. Tiltmeters in the summit area and along the east rift zone indicated no significant deformation.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Report for Piton de la Fournaise
The eruption that started on 11 June stopped on 7 July after 1 week of increased tremor. On 3 July tremor and the intensity of local earthquakes increased. The earthquakes had magnitudes less than 3 and were located under Dolomieu crater at a depth near sea level. On 6 and 7 July two aa lava flows in the Grand Brûlé area crossed the national highway. On 7 July the end of the eruption was marked by the disappearance of the tremor and a dramatic decrease in the intensity of local earthquakes.
Source: Observatoire Volcanologique du Piton de la Fournaise (OVPF)
Report for Popocatepetl
On 3 July at 0410 and 0648 moderate-sized explosions occurred. The latter explosion lasted about 10 minutes and produced an ash cloud that rose ~4 km above the volcano. Initially the cloud drifted to the SE and later the highest portion of the cloud drifted to the NW. Based on information from pilot reports and ground observations, the Washington VAAC reported that the ash cloud was 9.3 km SE of Mexico City Airport at 0930. Ashfall occurred in several towns including Chalco, ~35 km NW of the volcano, and there were reports of light ashfall on the airport's runways.
Sources: Centro Nacional de Prevencion de Desastres (CENAPRED), Washington Volcanic Ash Advisory Center (VAAC), Associated Press, CNN
Report for Semeru
Based on information from pilot reports and the Meteorological and Geophysical Agency of Indonesia, the Darwin VAAC reported that on 8 July at 1503 a SE-drifting ash plume rose to ~2.5 km above the volcano. Ground based reports prior to the eruption revealed that each day during 18-24 June Semeru emitted ash to ~0.6 km above the volcano.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Sheveluch
During 29 June to 6 July seismic activity remained above background levels, but the level of explosive volcanic activity decreased in comparison to the previous week. On 2 and 3 July a thermal anomaly was visible on satellite imagery. On 3, 4, and 5 July voluminous gas-and-steam plumes rose 2-2.5 km above the volcano. Due to the decrease in volcanic activity the Concern Color Code at Shiveluch was reduced from Orange to Yellow.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Soufriere Hills
During 29 June to 6 July volcanic activity at Soufrière Hills remained similar to the previous week. Lava dome growth appeared to still be concentrated on the S side of the dome above the White River. On 30 June a large number of rockfalls traveled down the N side of the talus apron in the Tar River. On 4 July two small pyroclastic flows traveled down the volcano's W flank in the Amersham area. The Washington VAAC reported that on 4 July an ash cloud rose ~3 km a.s.l. and drifted to the WNW. Also, on 10 July numerous rockfalls produced W-drifting ash plumes that did not exceed ~3 km a.s.l. in height.
Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC)
Report for Tungurahua
During 3-8 July several small-to-moderate eruptions produced ash clouds. One of the larger eruptions occurred on 5 July at 1310, producing an ash cloud that a pilot reported rose to ~7.6 km a.s.l. However, satellite imagery and additional information suggested that the dense SE-drifting ash cloud rose to ~9 km a.s.l.
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG), Washington Volcanic Ash Advisory Center (VAAC)