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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, 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 that meet criteria discussed in detail in the "Criteria and Disclaimers" section. Carefully reviewed, detailed narratives on various volcanoes are published as reports of the Bulletin of the Global Volcanism Network.

Smithsonian / USGS Weekly Volcanic Activity Report for the week of 12 September-18 September 2012
Name Location Eruption Start Date Report Status
Etorofu-Yakeyama [Grozny Group] Iturup (Etorofu) Island (Japan/Russia) New
Fuego Guatemala 2002 Jan 4 New
Gamalama Halmahera (Indonesia) New
Little Sitkin United States New
Lokon-Empung Sulawesi (Indonesia) New
San Cristobal Nicaragua New
Soputan Sulawesi (Indonesia) New
Aira Kyushu (Japan) 2017 Mar 25 Continuing
Batu Tara Komba Island (Indonesia) Continuing
Karymsky Eastern Kamchatka (Russia) 2020 Apr 1 Continuing
Kilauea Hawaiian Islands (USA) 2020 Dec 20 Continuing
Popocatepetl Mexico 2005 Jan 9 Continuing
Sheveluch Central Kamchatka (Russia) 1999 Aug 15 Continuing
Telica Nicaragua Continuing
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 16,408 individual reports over 1,051 weeks (average of 16 per week) on 309 different volcanoes.

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

Report for Etorofu-Yakeyama [Grozny Group]
Based on visual observations and analyses of satellite imagery, SVERT reported that during 10-17 September fumarolic activity at Grozny Group was at a medium intensity. The Aviation Color Code was lowered to Green.
Source: Sakhalin Volcanic Eruption Response Team (SVERT)
Report for Fuego
In a special bulletin on 13 September, INSIVUMEH reported that activity at Fuego increased, starting the sixth eruption in 2012. Lava flows traveled 600 m down the Taniluyá drainage (SSW) and the Las Lajas drainage (SE), producing block avalanches that reached vegetated areas. Strombolian explosions generated ash plumes that rose 3 km above the crater and drifted SW and 12 km W. Ash fell in multiple areas, including the villages of Panimaché (8 km SW), Morelia (8 km SW), Santa Sofia (12 km SE), Sangre de Cristo (8 km WSW), Palo Verde, San Pedro Yepocapa (8 km NW), Santiago Atitlan (42 km NW), San Lucas Toliman (32 km NW), Mazatenango (68 km W), Suchitepéquez, Retalhuleu (86 km W), and Santa Lucia Cotzumalguapa (23 km SW). Explosions produced degassing sounds and rumbling noises, accompanied by shock waves that vibrated structures on the SW flank. Pyroclastic flows traveled down the Las Lajas and Ceniza (SSW) drainages, producing ash plumes. CONRED increased the Alert Level to Orange (third highest on a four-color scale). About 10,600 people evacuated from nearby communities including Yepocapa, San Juan Alotenango (9 km ENE), Sacatepéquez. Evacuation shelters were set up in Santa Lucia Cotzumalguapa.

Later that day seismicity decreased, ash plumes rose 300 m above the crater and drifted W and NW, fewer pyroclastic flows were observed, and the rate of explosions slowed. Ashfall was reported in Panimaché, Morelia, and Sangre de Cristo. Lava flows in the Ceniza drainage were 1 km long and 150 m wide, and in Las Lajas were 700 m long and 100 m wide. CONRED noted that residents began to return to their homes on 14 September.

During 14-18 September explosions generated rumbling noises; ash plumes that rose 400-900 m above the crater drifted 7-8 km W and SW, causing ashfall in Sangre de Cristo, Panimaché I, and Panimaché II. Lava flows were at most 1.2 km long in the Taniluyá drainage and 200 m long in the Ceniza drainage during 14-16 September; flows were not observed during 17-18 September.
Sources: Coordinadora Nacional para la Reducción de Desastres (CONRED), Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Gamalama
CVGHM reported that during 1-14 September cloudy weather and fog at Gamalama mostly prevented observations from the post in Marikurubu and from S Ternate (S, SE, and E part of island); white plumes were sometimes observed rising 10 m above the crater. A phreatic eruption on 15 September at 2027 produced ashfall in Ternate. An eruption at 1415 the next day was accompanied by rumbling sounds. A plume rose 1 km and drifted SE and S, producing ashfall at the Gamalama observation post five minutes later. Neither eruption was observed due to fog. The Alert Level was raised to 3 (on a scale of 1-4) on 16 September. Visitors and residents were warned not to approach the crater within a radius of 2.5 km.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Little Sitkin
AVO reported that during 11-18 September seismic activity at Little Sitkin remained elevated and satellite views were obscured by clouds. Two earthquake swarms were detected on 11 and 13 September. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Lokon-Empung
According to the Darwin VAAC, ground-based observers reported that on 15 September an ash plume from Lokon-Empung rose to an altitude of 3 km (10,000 ft) a.s.l. On 15 September satellite imagery showed an ash plume drifting 185 km SE.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for San Cristobal
On 10 September, INETER reported that seismicity decreased after the 8 September eruption at San Cristóbal. Sulfur dioxide emissions had decreased since the previous day. During 10-11 September steam plumes rose 200-300 m above the crater and drifted W. Three small explosions on 11 September generated ash-and-gas plumes that rose 300 m above the crater and drifted W. An explosion and ash venting was observed a few hours later; a plume drifted S and ash fell on the flanks. The seismic network detected small explosions on 13 September. Sulfur dioxide gas emissions were above normal, and similar to levels detected on 8 September. Sulfur dioxide gas emissions increased on 14 September. The next day a small explosion was observed and gas plumes drifted NE. Gas plumes drifted N on 17 September.
Source: Instituto Nicaragüense de Estudios Territoriales (INETER)
Report for Soputan
Based on information from US Air Force Weather Agency (AFWA), the Darwin VAAC reported that an ash plume from Soputan rose to an altitude of 9.1 km (30,000 ft) a.s.l. on 18 September. The VAAC also noted that a sulfur dioxide alert was issued by the Support to Aviation Control Service (SACS).
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Aira
Based on information from JMA, the Tokyo VAAC reported that explosions from Sakura-jima during 13-15 and 17-18 September often produced plumes that rose to altitudes of 2.1-3.7 km (7,000-12,000 ft) a.s.l. The plumes sometimes drifted NW, N, and NE. On 14 September a pilot observed an ash plume that rose to an altitude of 3.4 km (11,000 ft) a.s.l.
Source: Japan Meteorological Agency (JMA)
Report for Batu Tara
Based on analyses of satellite imagery, the Darwin Volcanic Ash Advisory Centre (VAAC) reported that during 12-16 September ash plumes from Batu Tara rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 28-130 km W and NW.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Karymsky
KVERT reported weak-to-moderate seismic activity from Karymsky during 7-14 September. Seismic data indicated that ash plumes possibly rose to an altitude of 3 km (9,800 ft) a.s.l. Satellite imagery showed a thermal anomaly on the volcano on 7, 10, and 12 September. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Kilauea
During 12-18 September HVO reported that the circulating lava lake periodically rose and fell in the deep pit within Kilauea's Halema'uma'u Crater. The gas plume from the vent continued to deposit variable amounts of spatter and Pele's hair, and possible crater wall veneer, onto nearby areas. Lava flows were active above the abandoned Royal Gardens subdivision. At Pu'u 'O'o Crater, incandescence from the S and E pits on the crater floor, and from the W edge of the crusted N pit, was often visible. An opening in the roof of the lava tube at the base of the SE flank of Pu'u 'O'o also continued to glow. On 14 September HVO geologists estimated that the lava lake in the E pit was about 10 m below the rim.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Report for Popocatepetl
CENAPRED reported that during 12-18 September seismicity at Popocatépetl indicated continuing gas-and-steam emissions that sometimes contained ash; cloud cover often prevented visual observations of the volcano. Incandescence from the crater was observed most nights. On 13 September gas-and-steam plumes rose 2 km above the crater and drifted NE. Later that day a gas-and-ash plume rose 2 km. Incandescent tephra was ejected 500 m and fell on the NE flanks. On 14 September incandescent tephra fell on the N flank and gas-and-ash plumes rose 1 km. The next day gas-and-ash plumes again rose 1 km. During 16-18 September gas plumes continued to rise 1 km at most and drifted NE, NW, and SW. The Alert Level remained at Yellow, Phase Two.
Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Report for Sheveluch
Based on visual observations and analyses of satellite data, KVERT reported that during 7-14 September a viscous lava flow continued to effuse on the NW flank of Shiveluch's lava dome, and was accompanied by hot avalanches and fumarolic activity. Satellite imagery showed a thermal anomaly over the lava dome on 9, 11, and 13 September; cloud cover prevented observations on the other days, and during 15-16 September. Seismicity increased on 18 September. At 1119 observers noted that an ash plume rose to an altitude of 8 km (26,200 ft) a.s.l. and drifted 137 km SE. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Telica
During 10-11 September INETER reported "jet" sounds from Telica, two incandescent fumaroles, and gas-and-steam plumes rising 100-200 m above the crater. On 11 September two small explosions occurred in the crater. During 12-14 and 17 September gas plumes rose 30-150 m and incandescence from the crater was observed. Gas measurements on 14 and 17 September showed normal levels of sulfur dioxide emissions.
Source: Instituto Nicaragüense de Estudios Territoriales (INETER)