All times are local unless otherwise stated.

Cleveland (United States) | 26 October-1 November 2016 | New Activity / Unrest Cite this Report
Cleveland Aleutian Ridge Volcanic Arc	On 31 October AVO reported that satellite views of Cleveland late in the last week indicated that the 24 October explosion destroyed most of the previous lava dome, leaving a deep crater. Darkened areas around the summit region in post-explosion web camera images were interpreted as minor ash deposits from the explosion. Unrest continued during 26 October-1 November; clouds often obscured views of the volcano. The Level of Concern Color Code remained at Orange and the Volcano Alert Level remained at Watch. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Copahue (Chile-Argentina) | 26 October-1 November 2016 | New Activity / Unrest Cite this Report
Copahue Andean Southern Volcanic Arc	Based on satellite and webcam images, the Buenos Aires VAAC reported that during 27-30 October gas and water vapor plumes with minor ash content remained near Copahue's summit. The plumes drifted NE on 27 October and E on 30 October. Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
Merapi (Indonesia) | 26 October-1 November 2016 | New Activity / Unrest Cite this Report
Merapi Sunda Volcanic Arc	BNPB reported that a lahar induced by moderate to heavy rain swept nine sand mining trucks down the Bebeng River on Merapi's SW flank; at least one truck was buried and six were severely damaged. There were no fatalities as the miners and other people at the scene escaped. Material at the summit and on the flanks produced during the October-November 2010 eruption was an estimated 20-25 million cubic meters, contributing to the continuing high potential of lahars during heavy rain. BNPB recommended that the public remain vigilant during rainy weather because a lahar formed on the upper flanks of Merapi can reach the bottom in less than 30 minutes. The Alert Level remained at 1 (on a scale of 1-4). Source: Badan Nacional Penanggulangan Bencana (BNPB)
Ulawun (Papua New Guinea) | 26 October-1 November 2016 | New Activity / Unrest Cite this Report
Ulawun Bismarck Volcanic Arc	Based on analyses of satellite imagery, the Darwin VAAC reported that during 26-28 October ash plumes from Ulawun rose to altitudes of 2.4-3 km (8,000-10,000 ft) a.s.l. and drifted NW, W, and NE. Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Bagana (Papua New Guinea) | 26 October-1 November 2016 | Continuing ActivityCite this Report
Bagana Solomon Volcanic Arc	Based on analyses of satellite imagery and model data, the Darwin VAAC reported that during 28-29 October ash plumes from Bagana rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted W. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Colima (Mexico) | 26 October-1 November 2016 | Continuing ActivityCite this Report
Colima Trans-Mexican Volcanic Belt	Based on satellite images, the Washington VAAC reported that on 30 October an ash plume from Colima rose to an altitude of 4.3 km (14,000 ft) a.s.l. and drifted SW. Source: Washington Volcanic Ash Advisory Center (VAAC)
Dukono (Indonesia) | 26 October-1 November 2016 | Continuing ActivityCite this Report
Dukono Halmahera Volcanic Arc	Based on analyses of satellite imagery, information from PVMBG, and model data, the Darwin VAAC reported that during 26 October-1 November ash plumes from Dukono rose to altitudes of 2.1-2.4 km (7,000-8,000 ft) a.s.l. and drifted NE and E. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Kilauea (United States) | 26 October-1 November 2016 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	During 26 October-1 November HVO reported that the lava lake continued to rise and fall, circulate, and spatter in Kilauea’s Overlook vent; the lava lake fluctuated between 13 and 17.5 m below the Halema’uma’u floor. Webcams recorded incandescence from long-active sources within Pu'u 'O'o Crater. The 61G lava flow, originating from a vent on Pu'u 'O'o Crater's E flank, continued to enter the ocean near Kamokuna at the easternmost lava delta. Aerial observations on 27 October revealed prominent surface cracks on the E delta suggesting growing instability; small collapses of the delta occurred earlier in the week. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Klyuchevskoy (Russia) | 26 October-1 November 2016 | Continuing ActivityCite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	KVERT reported that a Strombolian eruption at Klyuchevskoy continued during 21-28 October. Gas-and-steam emissions with variable amounts of ash rose from the summit crater and from the cinder cone in the Apakhonchich drainage on the E flank. A lava flow traveled down the Apakhonchich drainage. Satellite images showed a large and bright daily thermal anomaly at the volcano, and ash plumes from explosions that rose to altitudes of 5-7 km (16,400-23,000 ft) a.s.l. and drifted 335 km E, N, NW, and W during 20-21 and 23-27 October. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Nevado del Ruiz (Colombia) | 26 October-1 November 2016 | Continuing ActivityCite this Report
Nevado del Ruiz Andean Northern Volcanic Arc	Servicio Geológico Colombiano’s (SGC) Observatorio Vulcanológico y Sismológico de Manizales reported that seismic signals indicating ash emissions from Nevado del Ruiz were recorded at 0608 on 27 October and 1341 on 30 October. The ash plume from the 27 October event drifted NE; weather clouds prevented conformation of the second event. The Alert Level remained at III (Yellow; the second lowest level on a four-color scale). Source: Servicio Geológico Colombiano (SGC)
Nevados de Chillan (Chile) | 26 October-1 November 2016 | Continuing ActivityCite this Report
Nevados de Chillan Andean Southern Volcanic Arc	Based on webcam images, the Buenos Aires VAAC reported that on 28 October an ash puff from Nevados de Chillán rose to an altitude of 4.3 km (14,000 ft) a.s.l. and quickly dissipated near the summit. Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
Sheveluch (Russia) | 26 October-1 November 2016 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that during 21-28 October lava-dome extrusion onto Sheveluch’s N flank was accompanied by strong fumarolic activity, dome incandescence, ash explosions with ash plumes as high as 7 km (23,000 ft) a.s.l., and hot avalanches. Satellite images showed a daily thermal anomaly over the dome. According to video and satellite data, ash plumes drifted just over 300 km E, N, and NW on 20, 22, and 26 October. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Sinabung (Indonesia) | 26 October-1 November 2016 | Continuing ActivityCite this Report
Sinabung Sunda Volcanic Arc	Based on satellite images, wind data, and ground reports from PVMBG, the Darwin VAAC reported that on 26 and 29 October ash plumes from Sinabung rose to an altitude of 4.2 km (14,000 ft) a.s.l. and drifted SSE. During 31 October-1 November ash plumes rose to an altitude of 3.4 km (11,000 ft) a.s.l. and drifted NE. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Turrialba (Costa Rica) | 26 October-1 November 2016 | Continuing ActivityCite this Report
Turrialba Central America Volcanic Arc	OVSICORI-UNA reported that daily during 27 October-1 November ash plumes rose as high as 1 km above Turrialba’s active vent. The plumes drifted in variable directions; ashfall was reported in Nubes de Coronado on 28 October. Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,322 individual reports over 1,229 weeks (average of 17 per week) on 336 different volcanoes.

Use the dropdowns to choose the year and week for archived Weekly Reports.

 News Feeds and Google Placemarks

 Criteria & Disclaimers

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.

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)