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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 6 July-12 July 2005
Name Location Eruption Start Date Report Status
Cleveland Chuginadak Island (USA) New
Merapi Central Java (Indonesia) 2020 Dec 31 New
Sheveluch Central Kamchatka (Russia) 1999 Aug 15 New
Aira Kyushu (Japan) 2017 Mar 25 Continuing
Anatahan Mariana Islands (USA) Continuing
Colima Mexico Continuing
Fuego Guatemala 2002 Jan 4 Continuing
Galeras Colombia Continuing
Karymsky Eastern Kamchatka (Russia) 2020 Apr 1 Continuing
Kilauea Hawaiian Islands (USA) 2021 Sep 29 Continuing
Pacaya Guatemala 2015 Jun 7 ± 1 days Continuing
Reventador Ecuador 2008 Jul 27 Continuing
Santa Maria Guatemala 1922 Jun 22 Continuing
Soufriere Hills Montserrat Continuing
St. Helens United States Continuing
Suwanosejima Ryukyu Islands (Japan) 2004 Oct 23 Continuing
Talang Indonesia 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 17,221 individual reports over 1,090 weeks (average of 16 per week) on 316 different volcanoes.

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Agung Concepcion Ijen Little Sitkin Peuet Sague Spurr
Ahyi Copahue Iliamna Llaima Pinatubo St. Helens
Aira Cotopaxi Iliwerung Loihi Planchon-Peteroa Stromboli
Akan Cuicocha Inielika Lokon-Empung Poas Sulu Range
Alaid Cumbal Ioto Lopevi Popocatepetl Sumbing
Alu-Dalafilla Dabbahu Irazu Machin Puyehue-Cordon Caulle Sundoro
Ambae Dempo Iya Makian Rabaul Suretamatai
Ambang Descabezado Grande Izu-Torishima Makushin Raikoke Suwanosejima
Ambrym Dieng Volcanic Complex Jackson Segment Maly Semyachik Ranakah Taal
Anatahan Dukono Kaba Manam Raoul Island Tair, Jebel at
Aniakchak Ebeko Kadovar Manda Hararo Rasshua Takawangha
Antillanca Volcanic Complex Ebulobo Kambalny Marapi Raung Talang
Antuco Egon Kanaga Maroa Redoubt Tambora
Apoyeque Ekarma Kanlaon Martin Reventador Tanaga
Arenal Epi Karangetang Masaya Reykjanes Tandikat-Singgalang
Asamayama Erebus Karkar Maule, Laguna del Rincon de la Vieja Tangkoko-Duasudara
Askja Erta Ale Karthala Mauna Loa Rinjani Tangkuban Parahu
Asosan Etna Karymsky Mayon Ritter Island Tara, Batu
Atka Etorofu-Yakeyama [Grozny Group] Kasatochi McDonald Islands Rotorua Telica
Augustine Eyjafjallajokull Katla Melimoyu Ruang Tenerife
Avachinsky Fernandina Katmai Merapi Ruapehu Tengger Caldera
Awu Fogo Kavachi Midagahara Ruiz, Nevado del Three Sisters
Axial Seamount Fonualei Kelimutu Misti, El Sabancaya Tinakula
Azul, Cerro Fournaise, Piton de la Kelut Miyakejima Sakar Tofua
Azumayama Fourpeaked Kerinci Momotombo Salak Tokachidake
Bagana Fuego Ketoi Monowai San Cristobal Tolbachik
Balbi Fujisan Kharimkotan Montagu Island San Miguel Toliman
Bamus Fukutoku-Oka-no-Ba Kick 'em Jenny Moyorodake [Medvezhia] San Vicente Tongariro
Banda Api Galeras Kikai Mutnovsky Sangay Tungurahua
Bardarbunga Galunggung Kilauea Myojinsho Sangeang Api Turrialba
Barren Island Gamalama Kirishimayama Nabro Santa Ana Ubinas
Batur Gamkonora Kizimen Negra, Sierra Santa Maria Ugashik-Peulik
Bezymianny Gareloi Klyuchevskoy Negro, Cerro Sarigan Ukinrek Maars
Bogoslof Gaua Kolokol Group Nightingale Island Sarychev Peak Ulawun
Brava Gorely Korovin Nishinoshima Saunders Unnamed
Bristol Island Great Sitkin Koryaksky Nisyros Savo Unnamed
Bulusan Grimsvotn Krakatau Novarupta Semeru Veniaminof
Calbuco Guagua Pichincha Krummel-Garbuna-Welcker NW Rota-1 Semisopochnoi Villarrica
Callaqui Guallatiri Krysuvik-Trolladyngja Nyamulagira Seulawah Agam Vulcano
Cameroon Guntur Kuchinoerabujima Nyiragongo Sheveluch West Mata
Campi Flegrei del Mar di Sicilia Hachijojima Kurikomayama Okataina Shishaldin Westdahl
Cayambe Hakoneyama Kusatsu-Shiranesan Okmok Simbo Whakaari/White Island
Chachadake [Tiatia] Heard Kverkfjoll Ontakesan Sinabung Witori
Chaiten Hekla La Palma Oraefajokull Sinarka Wolf
Chiginagak Helgrindur Lamington Osorno Siple Yasur
Chikurachki Hierro Lamongan Pacaya Sirung Zaozan [Zaosan]
Chiles-Cerro Negro Hokkaido-Komagatake Langila Pagan Slamet Zavodovski
Chillan, Nevados de Home Reef Lanin Palena Volcanic Group Snaefellsjokull Zhupanovsky
Chirinkotan Hood Lascar Paluweh Soputan Zubair Group
Chirpoi Huaynaputina Lateiki Panarea Sorikmarapi
Ciremai Hudson, Cerro Lengai, Ol Doinyo Papandayan Sotara
Cleveland Huila, Nevado del Leroboleng Parker Soufriere Hills
Colima Hunga Tonga-Hunga Ha'apai Lewotobi Pavlof Soufriere St. Vincent
Colo Ibu Lewotolok Pelee South Sarigan Seamount
 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 Cleveland
Satellite imagery of Cleveland taken during 1-8 July revealed increased activity at the volcano, so AVO assigned a Concern Color Code of Yellow on 7 July. The images showed increased heat flow, thin ash deposits, and possible debris flows extending ~1 km down the volcano's flanks from the summit crater. AVO reported that based on historical eruptions at Cleveland, it is possible that explosive, ash-producing events could occur at any time without warning (due to a lack of seismic monitoring).
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Merapi
An increase in the number of volcanic earthquakes at Merapi during 7-11 July led DVGHM to increase the Alert Level at the volcano to 2 (on a scale of 1-4) on 9 July.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Sheveluch
On 6 July ash-and-gas plumes from Shiveluch rose to ~7 km (~23,000 ft) a.s.l. and drifted NW. On 7 July an 11-minute-long seismic event occurred and ash-and-gas plumes may have reached a height of 10 km (32,800 ft) a.s.l. Around 8 July, KVERT raised the Concern Color Code at Shiveluch from Orange to Red, the highest level. On 8 July, video footage showed weak gas-and-steam plumes rising to ~5 km (16,400 ft ) a.s.l. On 9 July, the Concern Color Code was reduced to Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Aira
Based on information from JMA, the Tokyo VAAC reported that explosions occurred at Sakura-jima on 8 and 10 July. The heights of the resultant plumes were not reported.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Report for Anatahan
During 6-11 July, eruptive activity continued at Anatahan, with steam-and-ash plumes rising to a maximum height of 6.1 km (20,000 ft) a.s.l. On 6 July beginning at 1730 the amount of tremor at the volcano increased and an eruption produced an ash plume to ~12.2 km (~40,000 ft) a.s.l. During 8-11 July, a thin layer of vog (volcanic fog) extended over much of the Philippine Sea.
Source: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program
Report for Colima
Several explosions occurred at Colima during 6-9 July and small landslides traveled down the volcano's flanks during 8-9 July. Due to the threat of lahars forming on the volcano's flanks, Universidad de Colima advised avoiding the ravines of La Lumbre, San Antonio, Monte Grande (in Colima state), and La Arena (in Jalisco state).
Source: Centro Universitario de Estudios e Investigaciones de Vulcanologia - Universidad de Colima
Report for Fuego
During 6-11 July, several explosions at Fuego produced low-level plumes. Small avalanches of volcanic material traveled down the S and W sides of the central crater, and from the front of a lava flow.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Galeras
During 4-11 July, seismicity remained at low levels at Galeras. An M 2.5 volcano-tectonic earthquake on 4 July was felt in sections of some towns near the volcano. During the report period, small amounts of deformation were recorded and low rates of gas discharge were noted.
Source: Servicio Geológico Colombiano (SGC)
Report for Karymsky
Seismicity was above background levels at Karymsky during 1-8 July. Based on interpretations of seismic data during 4-7 July, ash-and-gas plumes may have risen to ~3 km above the crater (14,900 ft a.s.l.). Karymsky remained at Concern Color Code Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Kilauea
During 6-11 July, lava from Kilauea continued to enter the sea at the East Kamoamoa and East Lae`apuki entries. East Lae`apuki was much larger, with several entry points. East Kamoamoa barely emitted a glow from the incandescent lava. Surface lava was visible along the PKK lava flow. Background volcanic tremor remained above normal levels at Kilauea's summit and at moderate levels at Pu`u `O`o. Slight inflation and deflation occurred at the volcano.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Report for Pacaya
During 6-11 July, lava flows traveled 200-300 m down Pacaya's SW flank. Small plumes emitted from the volcano's central crater rose to low altitudes.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Reventador
As of 6 July, harmonic tremor, occasional explosions, and long-period and volcano-tectonic earthquakes continued at Reventador. Strong Strombolian fountaining was observed during the evening and one of the lobes of a lava flow (Lava number 5) was advancing down the caldera wall following the Río Marker. The flow abruptly slowed to ~20 m/day in comparison to flow-front velocities of ~70 m/day during 19-23 June, and ~50 m/day during 23-30 June. Lava number 5 was ~1.2 km from a steep incline, where it could begin to rapidly descend to the alluvial fan where the highway and petroleum pipeline are located.

Based on information from IG, the Washington VAAC reported that an ash plume extended N of the volcano's summit on 11 July. No ash was visible on satellite imagery.
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG), Washington Volcanic Ash Advisory Center (VAAC)
Report for Santa Maria
During 6-11 July, weak-to-moderate explosions continued at Santa María's Santiaguito lava-dome complex, with plumes rising to ~1 km above the volcano (15,700 ft a.s.l.). Avalanches of volcanic material were produced at the front of an active lava flow, and from the SW edge of Caliente Dome.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Soufriere Hills
During 1-8 July, seismic and volcanic activity at Soufrière Hills remained at elevated levels. The seismic network recorded 15 hybrid earthquakes, 11 long-period earthquakes, 9 volcano-tectonic earthquakes, and 11 rockfalls. Periodic ash venting continued and an explosion occurred on 3 July at 0130, which was similar to an explosion on 28 June. The reversal of deformation to an inflationary trend that began in mid-July continued during the report period. The daily recorded sulfur-dioxide flux varied from 241 metric tons per day (t/d) on 4 July to 1700 t/d on 1 July, with an average of 767 t/d for the week. This was above the long-term average for the eruption of 500 t/d.
Source: Montserrat Volcano Observatory (MVO)
Report for St. Helens
Growth of the new lava dome inside the crater of Mount St. Helens continued during 6-12 July, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. CVO reported on 12 July that rates of seismicity and ground deformation at Mount St. Helens had declined during the previous 2 weeks to some of the lowest levels since the eruption began in September 2004. They reported that a similar lull in activity occurred in December 2004, so it does not mean that the eruption is necessarily ending.
Source: US Geological Survey Cascades Volcano Observatory (CVO)
Report for Suwanosejima
Based on information from JMA, the Tokyo VAAC reported that an explosion occurred at Suwanose-jima on 6 July at 1400. The height of the resultant ash cloud was not reported.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Report for Talang
Small phreatic eruptions occurred at Talang on 2 and 3 July. The eruptions occurred at the main crater, and a crater on the volcano's S slope. Ash columns reached 300-500 m above the volcano (10,500-11,100 ft a.s.l.). Gabuo Atas, Gabuo Bawah, and Kapundan Panjang craters on the volcano's N slope emitted steam to low altitudes. Talang remained at Alert Level 2 (on a scale of 1-4). Visitors were not permitted to enter within a 1 km radius of the active craters.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Tungurahua
During 6-11 July, volcanic and seismic activity were at relatively low levels at Tungurahua. Low-energy plumes were emitted that were composed of gas, steam, and occasionally small amounts of ash. Seismicity remained at low levels.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)