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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 10 August-16 August 2011
Name Location Eruption Start Date Report Status
Cleveland Chuginadak Island (USA) New
Dukono Halmahera (Indonesia) 1933 Aug 13 New
Etna Sicily (Italy) 2013 Sep 3 New
Kilauea Hawaiian Islands (USA) New
Marapi Indonesia New
Papandayan Western Java (Indonesia) New
Rabaul New Britain (Papua New Guinea) New
Soputan Sulawesi (Indonesia) New
Aira Kyushu (Japan) 2017 Mar 25 Continuing
Karymsky Eastern Kamchatka (Russia) 2021 Apr 3 Continuing
Kizimen Eastern Kamchatka (Russia) Continuing
Popocatepetl Mexico 2005 Jan 9 Continuing
Puyehue-Cordon Caulle Chile Continuing
Sheveluch Central Kamchatka (Russia) 1999 Aug 15 Continuing
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 16,844 individual reports over 1,072 weeks (average of 16 per week) on 311 different volcanoes.

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Agung Copahue Ijen Little Sitkin Pelee South Sarigan Seamount
Ahyi Cotopaxi Iliamna Llaima Peuet Sague Spurr
Aira Cuicocha Iliwerung Loihi Pinatubo St. Helens
Akan Cumbal Inielika Lokon-Empung Planchon-Peteroa Stromboli
Alaid Dabbahu Ioto Lopevi Poas Sulu Range
Alu-Dalafilla Dempo Irazu Machin Popocatepetl Sumbing
Ambae Descabezado Grande Iya Makian Puyehue-Cordon Caulle Sundoro
Ambang Dieng Volcanic Complex Izu-Torishima Makushin Rabaul Suretamatai
Ambrym Dukono Jackson Segment Maly Semyachik Raikoke Suwanosejima
Anatahan Ebeko Kaba Manam Ranakah Taal
Antillanca Volcanic Complex Ebulobo Kadovar Manda Hararo Raoul Island Tair, Jebel at
Antuco Egon Kambalny Marapi Rasshua Takawangha
Apoyeque Ekarma Kanaga Maroa Raung Talang
Arenal Epi Kanlaon Martin Redoubt Tambora
Asamayama Erebus Karangetang Masaya Reventador Tanaga
Askja Erta Ale Karkar Maule, Laguna del Reykjanes Tandikat-Singgalang
Asosan Etna Karthala Mauna Loa Rincon de la Vieja Tangkoko-Duasudara
Augustine Etorofu-Yakeyama [Grozny Group] Karymsky Mayon Rinjani Tangkuban Parahu
Avachinsky Eyjafjallajokull Kasatochi McDonald Islands Ritter Island Tara, Batu
Awu Fernandina Katla Melimoyu Rotorua Telica
Axial Seamount Fogo Katmai Merapi Ruang Tenerife
Azul, Cerro Fonualei Kavachi Midagahara Ruapehu Tengger Caldera
Azumayama Fournaise, Piton de la Kelimutu Misti, El Ruiz, Nevado del Three Sisters
Bagana Fourpeaked Kelut Miyakejima Sabancaya Tinakula
Balbi Fuego Kerinci Momotombo Sakar Tofua
Bamus Fujisan Ketoi Monowai Salak Tokachidake
Banda Api Fukutoku-Oka-no-Ba Kharimkotan Montagu Island San Cristobal Tolbachik
Bardarbunga Galeras Kick 'em Jenny Moyorodake [Medvezhia] San Miguel Toliman
Barren Island Galunggung Kikai Mutnovsky San Vicente Tongariro
Batur Gamalama Kilauea Myojinsho Sangay Tungurahua
Bezymianny Gamkonora Kirishimayama Nabro Sangeang Api Turrialba
Bogoslof Gareloi Kizimen Negra, Sierra Santa Ana Ubinas
Brava Gaua Klyuchevskoy Negro, Cerro Santa Maria Ugashik-Peulik
Bristol Island Gorely Kolokol Group Nightingale Island Sarigan Ukinrek Maars
Bulusan Great Sitkin Korovin Nishinoshima Sarychev Peak Ulawun
Calbuco Grimsvotn Koryaksky Nisyros Saunders Unnamed
Callaqui Guagua Pichincha Krakatau Novarupta Semeru Unnamed
Cameroon Guallatiri Krummel-Garbuna-Welcker NW Rota-1 Semisopochnoi Veniaminof
Campi Flegrei del Mar di Sicilia Guntur Krysuvik-Trolladyngja Nyamulagira Seulawah Agam Villarrica
Cayambe Hachijojima Kuchinoerabujima Nyiragongo Sheveluch West Mata
Cereme Hakoneyama Kurikomayama Okataina Shishaldin Westdahl
Chachadake [Tiatia] Heard Kusatsu-Shiranesan Okmok Simbo Whakaari/White Island
Chaiten Hekla Kverkfjoll Ontakesan Sinabung Witori
Chiginagak Helgrindur Lamington Oraefajokull Sinarka Wolf
Chikurachki Hierro Lamongan Osorno Siple Yasur
Chiles-Cerro Negro Hokkaido-Komagatake Langila Pacaya Sirung Zaozan [Zaosan]
Chillan, Nevados de Home Reef Lanin Pagan Slamet Zavodovski
Chirinkotan Hood Lascar Palena Volcanic Group Snaefellsjokull Zhupanovsky
Chirpoi Huaynaputina Lateiki Paluweh Soputan Zubair Group
Cleveland Hudson, Cerro Lengai, Ol Doinyo Panarea Sorikmarapi
Colima Huila, Nevado del Leroboleng Papandayan Sotara
Colo Hunga Tonga-Hunga Ha'apai Lewotobi Parker Soufriere Hills
Concepcion Ibu Lewotolok Pavlof Soufriere St. Vincent
 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 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 Cleveland
On 9 August AVO reported that possible thermal anomalies on Cleveland were detected in satellite imagery. Cloud cover prevented observations of the summit area during 10-12 and 15-16 August, but several thermal anomalies were visible during 13-14 August. A scientist that flew 32 km N of the volcano on 14 August observed small white "puffs" of steam rising 30-60 m above the summit, even though most of the volcano was obscured by clouds. The Volcano Alert Level remained at Watch and the Aviation Color Code remained at Orange. No current seismic information was available because Cleveland does not have a real-time seismic network.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Dukono
According to a news article, activity at Dukono had continued to increase. On 11 August ash explosions were audible within a radius of about 7 km from the base of the volcano. Ash was ejected as high as 1 km above the crater, producing plumes that drifted E and S, and also approached Tobelo City (14 km ENE). Seismographs at the Dukono observation post recorded more than 100 eruption earthquakes. Based on analyses of satellite imagery, the Darwin VAAC reported that on 11 and 14 August ash plumes rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted 93 km NW.
Sources: Darwin Volcanic Ash Advisory Centre (VAAC), Metro TV News
Report for Etna
Sezione di Catania - Osservatorio Etneo reported that on 11 August sporadic ash emissions from Etna's New SE Crater produced small grayish-brown ash plumes. Thermal surveillance cameras revealed hot material in late-afternoon emissions. In the evening and throughout the night small Strombolian explosions were observed at intervals of a few tens of minutes. Early on 12 August, the day of the tenth paroxysmal eruptive episode of 2011, the Strombolian activity intensified and was accompanied by an increase in volcanic tremor amplitude. Strombolian explosions then produced dark ash clouds, and lava overflowed the E rim of the crater through a deep breach formed during previous eruptions. During the following 30 minutes or so Strombolian activity rapidly intensified, and formed a pulsating lava fountain about 100 m tall. Fifteen minutes later a dense column of ash rose above the lava fountain while large bombs and blocks fell onto the cone surrounding the New SE Crater.

During the most intense period three vents in the crater were active, two in the central portion and one close to the E-rim breach. Soon after, the two vents in the center of the crater emitted only ash, while the E vent continued to eject jets of incandescent lava. The activity completely ceased more than a half an hour later. The lava produced during the eruption descended the W slope of the Valle del Bove in numerous lobes; the most advanced lava fronts reached the base of the steep slope above Monte Centenari. Ash- and lapilli-fall affected a relatively narrow area between Zafferana (10 km SE), and the coastal area between Giarre and Acireale, on the SE flank.
Source: Sezione di Catania - Osservatorio Etneo (INGV)
Report for Kilauea
During 10-16 August HVO reported that Kilauea's summit lava lake was mostly crusted, but lava, possibly from a source higher on the SE wall, occasionally flowed over the surface. Small rockfalls from the vent walls were frequent, and the gas plume from the vent continued to deposit variable amounts of ash and occasionally fresh spatter nearby. During an overflight on 11 August, scientists observed an E-W trench in the deepest part of the cavity. Lava was upwelling from the E end and flowing W. During 14-15 August hot and possibly spattering vents were visible on the W part of the cavity floor.

At the E-rift zone, lava continued to trickle onto Pu'u 'O'o's collapsed crater floor and some spattering occurred from various sources the floor. The W-flank vents remained active and fed an elongated perched lava pond that extended to the SW, and also a small flow which advanced a short distance N. Small overflows or breaches from the elongated lake were occasionally active on the N side. During the 11 August overflight, scientists noted that the activity was less vigorous; the two channels that continued to feed the perched lake were crusted over and the W-flank vents were no longer spattering. The pond rims were higher and the pond was narrower, lava flows from the base of the pond were active on the N and W sides of the pond, and the S rim of the pond appeared to be slowly migrating S. The crater floor subsided a small amount on 15 August.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Report for Marapi
According to a news article, two eruptions from Marapi occurred on 9 August. The article also noted that the Alert Level remained at 2 (on a scale of 1-4).
Source: Metro TV News
Report for Papandayan
On 13 August CVGHM reported that based on seismicity, deformation, geochemistry, and visual observations, the Alert Level for Papandayan was raised to 3 (on a scale of 1-4). During 1 June-12 August sulfur plumes rose 20-75 m above the vents. During the same period, seismicity increased with several hundreds of earthquakes detected per month. Temperature measurements in the Manuk thermal area indicated a relative increase from 29 June to 12 August and deformation measurements indicated inflation from 4 July to 10 August. Visitors and residents were not to venture within 2 km of the active crater.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Rabaul
RVO reported a decline in frequency of ash emission from Rabaul caldera's Tavurvur cone during 9-12 August, and no distinct explosions were detected. Ash-rich plumes rose 1 km above the crater and drifted NW, causing ashfall in Rabaul town (3-5 km NW) and in areas between Toliap (10 km NW) and Tavui. Seismicity was very low, consisting of sub-continuous volcanic tremor associated with the ash emissions and some small discrete low-frequency earthquakes. Ash emissions ceased on 12 August. During 13-15 August white vapor plumes rose from the crater.
Source: Rabaul Volcano Observatory (RVO)
Report for Soputan
CVGHM reported that during 19 July-13 August white plumes from Soputan's summit crater rose 50-150 m. Seismicity fluctuated, but declined overall until 10 August. On 14 August a gray-and-white eruption plume rose 1 km above the crater. Throughout the day, two more similar plumes rose 1.3 km above the crater. Based on analysis of satellite imagery, the Darwin VAAC reported that an ash plume drifted more than 100 km W. The Alert Level was raised to 3 (on a scale of 1-4). Visitors and residents were prohibited from going within a 6-km radius of the crater.
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Aira
Based on information from JMA, the Tokyo VAAC reported that during 10-16 August explosions from Sakura-jima produced plumes that rose to altitudes of 1.5-3.7 km (5,000-12,000 ft) a.s.l. On 12 August, a pilot observed an ash plume that rose to an altitude of 2.4 km (8,000 ft) a.s.l.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Report for Karymsky
KVERT reported that during 5-12 August moderate seismic activity continued at Karymsky and possible ash plumes rose to an altitude of 3 km (9,800 ft) a.s.l. A thermal anomaly on the volcano was detected daily by satellite. During 7-8 August, pilots observed ash plumes that rose to an altitude of 4 km (13,100 ft) a.s.l. and drifted E. Satellite imagery also showed an ash cloud, 3 by 1.5 km in dimension, that was 10 km W of the volcano on 10 August. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Kizimen
KVERT reported that during 5-12 August seismicity from Kizimen was above background levels and weak volcanic tremor continued to be detected. Video images showed fumarolic activity and an occasional steam-and-gas plume that rose to an altitude of 4 km (13,100 ft) a.s.l. A lava flow on the E flank remained active. Satellite images showed a bright thermal anomaly on the volcano all week. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Popocatepetl
CENAPRED reported that late on 9 August an ash plume from Popocatépetl rose 1 km above the crater and drifted W. During 11-12 August steam-and-gas emissions occasionally contained small amounts of ash.
Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Report for Puyehue-Cordon Caulle
During 10-14 August, OVDAS-SERNAGEOMIN reported that the eruption continued from the Cordón Caulle rift zone, part of the Puyehue-Cordón Caulle volcanic complex. Cloud cover prevented video camera observations during 10-12 August and satellite observations during 10-11 August. A diffuse plume detected in satellite imagery on 12 August drifted 150 km E. On 14 August a gray plume recorded by the camera rose 2 km above the crater, and satellite imagery showed a plume drifting 100-150 km E and SE. The Alert Level remained at Red, indicating that ashfall and lahars remain a hazard.
Source: Servicio Nacional de Geología y Minería (SERNAGEOMIN)
Report for Sheveluch
KVERT reported that seismicity at Shiveluch was moderate during 5-12 August. Seismic data indicated that possible ash plumes rose to an altitude of 6.7 km (22,000 ft) a.s.l. on 8 August, to an altitude of 6 km (19,700 ft) a.s.l. on 10 August, and to altitudes of 4-5.5 km (13,100-18,000 ft) a.s.l. on other days. Ground-based observers indicated that ash plumes rose to an altitude of 7 km (23,000 ft) a.s.l. on 6 August. Satellite imagery showed a daily thermal anomaly on the lava dome, and ash plumes that drifted 60 and 20 km SE on 6 and 10 August, respectively. The Aviation Color Code remained at Orange.

Based on analysis of satellite imagery, the Tokyo VAAC reported that on 13 August a possible eruption produced a plume that rose to an altitude of 4.3 km (14,000 ft) a.s.l. and drifted W. Ash was seen in subsequent satellite images that same day. An eruption on 15 August produced a plume that rose to an altitude of 7.9 km (26,000 ft) a.s.l.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)