All times are local unless otherwise stated.

Ebeko (Russia) | 28 October-3 November 2009 | New Activity / Unrest Cite this Report
Ebeko Kuril Volcanic Arc	KVERT reported that on 26 October a gas-and-steam plume from Ebeko was seen by observers in Severo-Kurilsk, about 7 km E of Ebeko, rising 300 m above the crater and drifting 1-2 km NNE. There was no evidence of ash deposits on the snow cover. Gas-and-steam plumes rose 250 m above the crater and drifted 2 km E on 28 October and NNE on 29 October. The Level of Aviation Color Code remained at Green. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Galeras (Colombia) | 28 October-3 November 2009 | New Activity / Unrest Cite this Report
Galeras Andean Northern Volcanic Arc	On 30 October, INGEOMINAS reported that the Alert Level for Galeras was raised to II (Orange; "probable eruption in term of days or weeks"). Since 27 October, degassing decreased and seismicity increased, reflecting conditions seen prior to previous eruptions. On 3 November, INGEOMINAS stated that gas emissions had been low during the previous days, and seismicity had decreased that day. Source: Servicio Geológico Colombiano (SGC)
Karangetang (Indonesia) | 28 October-3 November 2009 | New Activity / Unrest Cite this Report
Karangetang Sangihe Volcanic Arc	Based on a pilot observation and analyses of satellite imagery, the Darwin VAAC reported that on 3 November an ash plume from Karangetang rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted 90-185 km W. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Manam (Papua New Guinea) | 28 October-3 November 2009 | New Activity / Unrest Cite this Report
Manam Bismarck Volcanic Arc	Based on analyses of satellite imagery, the Darwin VAAC reported that during 1-2 November ash plumes from Manam rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 35-55 km NW and N. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Nevado del Huila (Colombia) | 28 October-3 November 2009 | New Activity / Unrest Cite this Report
Nevado del Huila Andean Northern Volcanic Arc	INGEOMINAS reported that on 28 October a pulse of tremor from Nevado del Huila was followed by an ash plume that, according to the Washington VAAC, rose to an altitude of 8.3 km (27,200 ft) a.s.l. On 30 October and 2 November overflights revealed a high rate of lava dome growth compared to the previous observation on 23 October. An ash layer covered the W part of Pico Central. Continuous and intense degassing originated from areas that also exhibited thermal anomalies detected with a thermal imaging camera. Resulting gas plumes drifted NW. The volume estimate for the new lava dome was nearly 9 million cubic meters. Based on analyses of satellite imagery, pilot observations, and web camera views, the Washington VAAC reported that on 31 October an ash plume drifted 65 km S. During 31 October-2 November, thermal anomalies were seen on satellite imagery. On 2 November, a small plume seen on the web camera drifted SE. Gas plumes, occasionally accompanied by ash plumes, drifted 35 km SE. On 3 November, INGEOMINAS reported that a pulse of tremor was followed by an ash plume that, according to the VAAC, rose to an altitude of 11.3 km (37,100 ft) a.s.l. and drifted SW. Ashfall was reported in communities downwind. The VAAC also noted that another ash plume rose to an altitude below 6.7 km (22,000 ft) a.s.l. and drifted E. INGEOMINAS stated that residents of Mosoco (20 km SSW) saw collapses from the W side of the dome generate small pyroclastic flows and incandescence at night. The Alert Level remained at II (Orange; "probable eruption in term of days or weeks"). Sources: Servicio Geológico Colombiano (SGC), Washington Volcanic Ash Advisory Center (VAAC)
Soufriere Hills (United Kingdom) | 28 October-3 November 2009 | New Activity / Unrest Cite this Report
Soufriere Hills Lesser Antilles Volcanic Arc	MVO reported that during 23-30 October seismic activity from the Soufrière Hills lava dome was at a slightly lower level that the previous week. Numerous pyroclastic flows occurred in most of the major drainage valleys and rockfalls were concentrated in the S. Heavy rainfall caused lahars in the Belham Valley to the W. On 28 October, two pyroclastic flows traveled 2 km W down Gages Valley. On 29 October, a 40-m-high spine was seen protruding from the summit. Changes in lava-dome morphology seen on 30 October, and occurrences of pyroclastic flows traveling NE, indicated that growth was concentrated in the central part of the lava dome. The Hazard Level remained at 3. Source: Montserrat Volcano Observatory (MVO)

Aira (Japan) | 28 October-3 November 2009 | Continuing ActivityCite this Report
Aira Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported that explosions from Sakura-jima during 28 October-3 November produced plumes that rose to altitudes of 1.2-2.7 km (4,000-9,000 ft) a.s.l. Some plumes drifted W, SW, S, SE, and NE. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Barren Island (India) | 28 October-3 November 2009 | Continuing ActivityCite this Report
Barren Island Andaman Volcanic Back-Arc	Based on analyses of satellite imagery, the Darwin VAAC reported that on 1 November an ash plume from Barren Island rose to an altitude of 1.8 km (6,000 ft) a.s.l. and drifted about 55-75 km W. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Chaiten (Chile) | 28 October-3 November 2009 | Continuing ActivityCite this Report
Chaiten Andean Southern Volcanic Arc	Based on analyses of satellite imagery, the Buenos Aires VAAC reported that on 30 October a diffuse ash plume from Chaitén's lava-dome complex rose possibly mixed with steam and gas drifted SSE. On 1 November, a plume drifted 20 km W. Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
Dukono (Indonesia) | 28 October-3 November 2009 | Continuing ActivityCite this Report
Dukono Halmahera Volcanic Arc	Based on analyses of satellite imagery, the Darwin VAAC reported that on 31 October an ash plume from Dukono rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted 35-110 km NE and N. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Karymsky (Russia) | 28 October-3 November 2009 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that seismic activity at Karymsky was above background levels during 23-27 and 30 October, a possible indication that ash plumes rose to an altitude of 3.7 km (12,100 ft) a.s.l. No seismic data was available on 22 and 28 October. Analyses of satellite imagery revealed an ash plume that drifted 120 km E on 23 October, and a thermal anomaly during 23-26 and 29 October. The Level of Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea (United States) | 28 October-3 November 2009 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	During 28 October-3 November, HVO reported that lava flowed SE from underneath Kilauea's Thanksgiving Eve Breakout (TEB) and rootless shield complex through a lava tube system, reaching the Waikupanaha ocean entry. Lava began entering the ocean at a second location, 700 m farther to the W, on 31 October. Thermal anomalies detected in satellite images and visual observations revealed active surface lava flows. Breakout lava flows were located inland of the Waikpuanaha entry and also immediately W of the County Public Viewing trail. Intermittent incandescence was seen from the Pu'u 'O'o crater floor and an East wall vent. The vent in Halema'uma'u crater continued to produce a diffuse white plume that drifted SW. Incandescence originated from occasionally spattering holes from a surface inside the vent cavity. On 3 November, a collapse of the surface revealed a circulating and spattering lava pond below. Preliminary measurements indicated that the sulfur dioxide emission rate at the summit remained elevated; 800 tonnes per day was measured on 30 October. The 2003-2007 average rate was 140 tonnes per day. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Klyuchevskoy (Russia) | 28 October-3 November 2009 | Continuing ActivityCite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	KVERT reported that during 23-30 October seismic activity from Kliuchevskoi was above background levels; tremor increased on 26 October. Strombolian activity ejected tephra 200 m above the crater and fumarolic activity was occasionally noted. Satellite imagery revealed a daily thermal anomaly at the volcano. The Level of Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Krakatau (Indonesia) | 28 October-3 November 2009 | Continuing ActivityCite this Report
Krakatau Sunda Volcanic Arc	CVGHM reported that from August to 29 October seismicity from Anak Krakatau, and the occurrence of eruption plumes, decreased. The Alert Level was lowered to 2 (on a scale of 1-4). Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Popocatepetl (Mexico) | 28 October-3 November 2009 | Continuing ActivityCite this Report
Popocatepetl Trans-Mexican Volcanic Belt	CENAPRED reported that on 29 October a small explosive event from Popocatépetl produced an ash plume that rose to an altitude of 6.4 km (21,000 ft) a.s.l. Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Rabaul (Papua New Guinea) | 28 October-3 November 2009 | Continuing ActivityCite this Report
Rabaul Bismarck Volcanic Arc	Based on analyses of satellite imagery, the Darwin VAAC reported that during 28-29 October ash plumes from Rabaul caldera's Tavurvur cone rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 35-45 km N, E, and SE. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Sheveluch (Russia) | 28 October-3 November 2009 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that during 23-30 October seismic activity from Shiveluch was above background levels and possibly indicated that ash plumes rose to an altitude of 3.7 km (12,100 ft) a.s.l. and to an altitude of 6.9 km (22,600 ft) a.s.l. on 29 October. Fumarolic activity was occasionally seen. Analyses of satellite imagery revealed a large thermal anomaly over the lava dome during 22-27 October and an ash plume that drifted 24 km NE on 26 October. Based on information from KEMSD and analyses of satellite imagery, the Tokyo VAAC reported that on 30 October an eruption produced a plume that rose to an altitude of 7 km (23,000 ft) a.s.l. A possible eruption plume rose to an altitude of 6.1 km (20,000 ft) a.s.l. later that day. On 1 November, an eruption produced a plume that rose to an altitude of 4.9 km (16,000 ft) a.s.l. Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
Suwanosejima (Japan) | 28 October-3 November 2009 | Continuing ActivityCite this Report
Suwanosejima Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported explosions from Suwanose-jima on 30 October and 2 November. Details of possible resulting emissions were not reported. Source: Tokyo Volcanic Ash Advisory Center (VAAC)

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)