All times are local unless otherwise stated.

Egon (Indonesia) | 27 January-2 February 2016 | New Activity / Unrest Cite this Report
Egon Sunda Volcanic Arc	PVMBG reported that during 20 January-1 February seismicity at Egon was dominated by signals indicating emissions; shallow volcanic events had decreased. RSAM values increased on 25 January but did not exceed values detected during the previous peak on 12 January; overall seismicity had declined. The Alert Level was lowered to 2 (on a scale of 1-4) and residents were advised to stay at least 1.5 km away from the crater. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Heard (Australia) | 27 January-2 February 2016 | New Activity / Unrest Cite this Report
Heard Kerguelen Hotspot Volcano Group	Scientists and crew aboard CSIRO’s (Commonwealth Scientific and Industrial Research Organisation) Marine National Facility research vessel Investigator circled Heard Island and observed a plume rising from Mawson Peak’s crater and lava flows traveling down the NW flanks during 30-31 January. Visual observations of Heard are very rare due to its remote location. A MODVOLC thermal alert had been issued for 28 January. Sources: Commonwealth Scientific and Industrial Research Organisation (CSIRO), NASA MODIS Rapid Response System
Masaya (Nicaragua) | 27 January-2 February 2016 | New Activity / Unrest Cite this Report
Masaya Central America Volcanic Arc	INETER reported that on 27 January the two lava lakes in Masaya's Santiago crater were smaller and sound waves generated by the activity were at moderate levels. Emissions drifted W and SW. The next day emissions decreased and the lava lake in the SW vent was less visible. On 29 January both lava lakes were again prominent, and a third vent opened in the SE part of the crater floor. Source: Instituto Nicaragüense de Estudios Territoriales (INETER)
McDonald Islands (Australia) | 27 January-2 February 2016 | New Activity / Unrest Cite this Report
McDonald Islands Kerguelen Hotspot Volcano Group	Scientists and crew aboard CSIRO’s (Commonwealth Scientific and Industrial Research Organisation) Marine National Facility research vessel Investigator observed a plume rising from McDonald Island (the largest island) during the last week of January. Visual observations of the McDonald Islands are very rare due to its remote location. Source: Commonwealth Scientific and Industrial Research Organisation (CSIRO)
Nevados de Chillan (Chile) | 27 January-2 February 2016 | New Activity / Unrest Cite this Report
Nevados de Chillan Southern Andean Volcanic Arc	Servicio Nacional de Geología and Minería (SERNAGEOMIN) Observatorio Volcanológico de Los Andes del Sur (OVDAS) reported that at 1425 on 29 January a phreatic explosion at Nevados de Chillán's Volcán Arrau dome complex generated an ash emission that was associated with a seismic tremor signal. During an overflight on 30 January volcanologists observed that the series of recent phreatic explosions had formed a new crater about 50 m from Arrau Crater, on the E flank. The new crater was 25-30 m wide and at a similar elevation as the crater formed on 8 January. The Alert Level remained at Yellow, the middle level on a three-color scale. Source: Servicio Nacional de Geología y Minería (SERNAGEOMIN)
Turrialba (Costa Rica) | 27 January-2 February 2016 | New Activity / Unrest Cite this Report
Turrialba Central America Volcanic Arc	OVSICORI-UNA reported that at 1020 on 2 February a small ash-and-gas emission from Turrialba rose about 500 m above West Crater and drifted S. Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)
Zhupanovsky (Russia) | 27 January-2 February 2016 | New Activity / Unrest Cite this Report
Zhupanovsky Eastern Kamchatka Volcanic Arc	KVERT reported that moderate activity at Zhupanovsky continued during 22-29 January. A thermal anomaly was detected in satellite images on 23 January. Explosions on 24 January generated ash plumes that rose to an altitude of 8 km (26,200 ft) a.s.l. and drifted over 235 km NNE. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Barren Island (India) | 27 January-2 February 2016 | Continuing ActivityCite this Report
Barren Island Andaman Volcanic Province	Based on analysis of satellite imagery and wind data, the Darwin VAAC reported that during 31 January-2 February ash plumes from Barren Island rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted as far as 165 km SW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Chirpoi (Russia) | 27 January-2 February 2016 | Continuing ActivityCite this Report
Chirpoi Kuril Volcanic Arc	SVERT reported that satellite images detected a thermal anomaly over Snow, a volcano of Chirpoi, during 25, 27-28, and 30-31 January. The Aviation Color Code remained at Yellow. Source: Sakhalin Volcanic Eruption Response Team (SVERT)
Colima (Mexico) | 27 January-2 February 2016 | Continuing ActivityCite this Report
Colima Trans-Mexican Volcanic Belt	Based on satellite images, wind data, webcam images, and notices from the Mexico City MWO, the Washington VAAC reported that on 29 January and 1 February ash plumes from Colima rose to altitudes of 4.6-6.7 km (15,000-22,000 ft) a.s.l. and drifted as far as 145 km ENE, E, SE, S, and W. Minor ash emissions were observed on 25 January. Source: Washington Volcanic Ash Advisory Center (VAAC)
Copahue (Chile-Argentina) | 27 January-2 February 2016 | Continuing ActivityCite this Report
Copahue Southern Andean Volcanic Arc	Based on satellite and webcam views, the Buenos Aires VAAC reported that during 28 January-2 February Copahue generated almost continuous steam plumes containing minor amounts of ash that rose to altitudes of 3-3.6 km (10,000-12,000 ft) a.s.l. and drifted as far as 160 km SE and SW. Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
Cotopaxi (Ecuador) | 27 January-2 February 2016 | Continuing ActivityCite this Report
Cotopaxi Northern Andean Volcanic Arc	On 29 January IG reported that in recent weeks surficial activity at Cotopaxi was characterized by minor steam emissions from the crater and sporadic gas emissions with minor amounts of ash. Sulfur dioxide emissions were less than 1,000 tons per day (pre-eruptive levels) and seismicity had almost returned to baseline levels. At 1843 on 24 January a plume with low-to-moderate levels of ash rose 700 m above the crater and drifted W. The emission coincided with a hybrid earthquake. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Dukono (Indonesia) | 27 January-2 February 2016 | Continuing ActivityCite this Report
Dukono Halmahera Volcanic Arc	Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 27 January-2 February ash plumes from Dukono rose to altitudes of 2.4-3 km (7,000-10,000 ft) a.s.l. and drifted 35-205 km in multiple directions. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Karymsky (Russia) | 27 January-2 February 2016 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that moderate explosive activity at Karymsky continued during 22-29 January. Satellite images detected a thermal anomaly on 23 and 26 January, and ash plumes that drifted about 160 km E and NW on 24 and 26 January, respectively. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea (United States) | 27 January-2 February 2016 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	HVO reported that seismicity beneath Kilauea's summit, upper East Rift Zone, and Southwest Rift Zone was at background levels during 27 January-2 February. The lava lake continued to circulate and spatter in the Overlook vent. Webcams recorded multiple incandescent outgassing vents within Pu'u 'O'o Crater and high on the northeast rim. The June 27th NE-trending lava flow continued to be active within 6 km NE of Pu'u 'O'o Crater, burning some areas of forest. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Momotombo (Nicaragua) | 27 January-2 February 2016 | Continuing ActivityCite this Report
Momotombo Central America Volcanic Arc	INETER reported that during 26-29 January RSAM values at Momotombo were at low to moderate levels, and gas emissions were at moderate levels. Crater incandescence from high-temperature gas emissions was observed at night during 26-27 January. A Strombolian explosion at 0344 on 30 January ejected tephra onto the E, NE, N, and NW flanks, and produced gas emissions. At 0529 on 31 January another explosion also ejected gas, ash, and incandescent material. Ashfall was reported in nearby areas including the communities of Boqueron, Puerto Momotombo (10 km WSW), and La Sabaneta. Moderate levels of gas emissions drifted SW towards Puerto Momotombo. Source: Instituto Nicaragüense de Estudios Territoriales (INETER)
Nevado del Ruiz (Colombia) | 27 January-2 February 2016 | Continuing ActivityCite this Report
Nevado del Ruiz Northern Andean Volcanic Arc	Servicio Geológico Colombiano’s (SGC) Observatorio Vulcanológico y Sismológico de Manizales reported that during 26 January-1 February seismicity at Nevado del Ruiz was characterized by long-period earthquakes and continuous volcanic tremor associated with gas-and-ash emissions. Earthquakes occurred at depths between 1 and 8.7 km. The largest event was recorded at 1300 on 28 January; it was a local M 0.9, N of Arenas Crater at a depth of 3.2 km. Significant amounts of water vapor and gas rose from the crater during the week. A gas, steam, and ash plume rose 850 m and drifted NW on 26 January. The Alert Level remained at III (Yellow; "changes in the behavior of volcanic activity"). Source: Servicio Geológico Colombiano (SGC)
Pagan (United States) | 27 January-2 February 2016 | Continuing ActivityCite this Report
Pagan Mariana Volcanic Arc	Satellite data and ground-based observations from a field crew and local residents near Pagan indicated that steam-and-gas emissions have significantly decreased since March 2015. The Aviation Color Code and Volcano Alert Level were lowered to Unassigned on 30 January. Source: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program
Santa Maria (Guatemala) | 27 January-2 February 2016 | Continuing ActivityCite this Report
Santa Maria Central America Volcanic Arc	INSIVUMEH reported that during 29 January-1 February explosions from Caliente cone, part of Santa María's Santiaguito lava-dome complex, generated ash plumes that rose 600-800 m and drifted E, SE, and SW. Ashfall was reported in Monte Claro (S), San Marcos (10 km SW), Palajunoj (18 km SSW), Aldea, and Santa María de Jesús. Small avalanches were generated from active lava flows. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Sheveluch (Russia) | 27 January-2 February 2016 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that during 22-29 January lava-dome extrusion onto Sheveluch’s N flank was accompanied by fumarolic activity, dome incandescence, ash explosions, and hot avalanches. Satellite images detected a daily and intense thermal anomaly over the dome. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Sinabung (Indonesia) | 27 January-2 February 2016 | Continuing ActivityCite this Report
Sinabung Sunda Volcanic Arc	Based on information from the Jakarta MWO, the Darwin VAAC reported that on 30 January and during 1-2 February ash plumes from Sinabung rose to altitudes of 3.7-4.3 km (12,000-14,000 ft) a.s.l. and drifted SW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Tengger Caldera (Indonesia) | 27 January-2 February 2016 | Continuing ActivityCite this Report
Tengger Caldera Sunda Volcanic Arc	Based on information from PVMBG, satellite images, and wind data, the Darwin VAAC reported that during 27-30 January ash plumes rose to an altitude of 3.9 km (13,000 ft) a.s.l. and drifted 25-65 NE, ENE, and E. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,652 individual reports over 1,244 weeks (average of 17 per week) on 338 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)