All times are local unless otherwise stated.

Masaya | 20 January-26 January 2016 | New Activity / Unrest Cite this Report
Masaya Nicaragua	INETER reported that during 20-22 January the lava lake in Masaya's Santiago crater continued to be active. Abundant gas emissions rose 350 m above the crater rim on 20 January, and an increase in sound waves from the lava-lake activity was reported. During a field visit that same day, volcanologists noted that the lava lake in the vent on the S part of the crater floor had risen, and that a vent on the NE part of the floor was incandescent. During 21-22 January small gas explosions sounded like gunshots. Source: Instituto Nicaragüense de Estudios Territoriales (INETER)
Planchon-Peteroa | 20 January-26 January 2016 | New Activity / Unrest Cite this Report
Planchon-Peteroa Central Chile-Argentina	Based on Observatorio Volcanológico de los Andes del Sur (OVDAS) observations, SERNAGEOMIN reported an increase in the number of long-period earthquakes at Planchón-Peteroa beginning on 15 January. On 22 January the Alert Level was raised to Yellow. Source: Servicio Nacional de Geología y Minería (SERNAGEOMIN)
Zhupanovsky | 20 January-26 January 2016 | New Activity / Unrest Cite this Report
Zhupanovsky Eastern Kamchatka (Russia)	Based on visual observations, KVERT reported that on 21 January explosions at Zhupanovsky generated ash plumes that rose to an altitude of 8 km (26,200 ft) a.s.l. and drifted 36 km W. A thermal anomaly was detected in satellite images. The Aviation Color Code remained at Orange (the second highest on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Chirpoi | 20 January-26 January 2016 | Continuing ActivityCite this Report
Chirpoi Kuril Islands (Russia)	SVERT reported that satellite images detected a thermal anomaly over Snow, a volcano of Chirpoi, on 18 and 23 January. The Aviation Color Code remained at Yellow. Source: Sakhalin Volcanic Eruption Response Team (SVERT)
Colima | 20 January-26 January 2016 | Continuing ActivityCite this Report
Colima Mexico	Based on satellite images, wind data, webcam images, and notices from the Mexico City MWO, the Washington VAAC reported that during 20-24 and 26 January 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 E, SE, S, and W. Minor ash emissions were observed on 25 January. Source: Washington Volcanic Ash Advisory Center (VAAC)
Copahue | 20 January-26 January 2016 | Continuing ActivityCite this Report
Copahue Central Chile-Argentina	Based on satellite and webcam views, the Buenos Aires VAAC reported that during 20-23 January almost continuous steam plumes from Copahue contained minor amounts of ash and drifted as far as 150 km W, S, SE, and E. Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
Dukono | 20 January-26 January 2016 | Continuing ActivityCite this Report
Dukono Halmahera	Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 20-24 and 26 January ash plumes from Dukono rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 15-120 km W and SW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Karymsky | 20 January-26 January 2016 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka (Russia)	KVERT reported that moderate explosive activity at Karymsky continued during 15-22 January. Satellite images detected a thermal anomaly during 15, 18-19, and 21 January. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea | 20 January-26 January 2016 | Continuing ActivityCite this Report
Kilauea Hawaiian Islands (USA)	HVO reported that seismicity beneath Kilauea's summit, upper East Rift Zone, and Southwest Rift Zone was at background levels during 20-26 January. 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)
Marapi | 20 January-26 January 2016 | Continuing ActivityCite this Report
Marapi Central Sumatra	PVMBG reported that on most days during periods of clear weather from 1 November 2015 to 19 January 2016 white plumes rose above Marapi as high as 250 m above the crater. A phreatic explosion at 2233 on 14 November generated an ash plume, and ashfall was noted in Panyalaian and Aia Angek on the SW flank. Seismicity fluctuated during 1-18 January; earthquakes indicating emissions, tornillo-type events, and shallow volcanic signals slightly increased. The Alert Level remained at 2 (on a scale of 1-4). Residents and visitors were advised not to enter an area within 3 km of the summit. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Momotombo | 20 January-26 January 2016 | Continuing ActivityCite this Report
Momotombo Nicaragua	INETER reported that during 20-21 January both RSAM values and emissions at Momotombo were low. Volcanic tremor increased at 0900 on 22 January, causing RSAM values to rise to high levels. There were no changes to emissions. INETER recommended to the public to stay at least 6 km away from the volcano. Source: Instituto Nicaragüense de Estudios Territoriales (INETER)
Popocatepetl | 20 January-26 January 2016 | Continuing ActivityCite this Report
Popocatepetl Mexico	CENAPRED reported that during 20-23 and 25 January the seismic network at Popocatépetl recorded 16-68 daily emissions consisting of water vapor, gas, and ash, and 2-5 explosions per day. At 1000 on 23 January an increase in activity was characterized by continuous gas-and-ash emissions, likely related to the destruction of a recently-formed lava dome. Later that night cameras recorded incandescent fragments ejected during periods of emissions. Activity decreased at 0200 on 24 January and then increased again at 0844, with explosions. A series of explosions on 25 January began at 1000 and ended at 1840. Constant steam-and-ash emissions drifted ENE. Another series of explosions occurred during 0218-0600 on 26 January. One of the explosions ejected incandescent fragments 900 m onto the NE flank. The Alert Level remained at Yellow, Phase Two. Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Reventador | 20 January-26 January 2016 | Continuing ActivityCite this Report
Reventador Ecuador	While in the field on 15 January, IG technicians observed several explosions at Reventador that generated ash plumes which rose 1.5-2 km above the crater. A pyroclastic flow traveled 500 m down the N flank. Pyroclastic flow deposits from the previous three weeks were also noted. Activity during 19-25 January remained high. At 2200 on 19 January a major explosion, heard in El Reventador village, ejected incandescent material onto the SW flank. Gas, steam, and ash emissions rose 0.8-2 km above the crater on most days. During 21-22 January incandescent material traveled 1.2 km down the W flank. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Rinjani | 20 January-26 January 2016 | Continuing ActivityCite this Report
Rinjani Lombok Island	PVMBG reported that during 25 October-24 November 2015 white and gray plumes rose as high as 2.6 km above Rinjani's Barujari Crater. Incandescent material was sometimes ejected 30-150 m high. Gray plumes observed during 25 November-24 December rose as high as 2.5 km. During 25 December 2015-18 January 2016 white plumes rose 50 m above the crater. Seismicity had also decreased to background levels. On 20 January the Alert Level was lowered to 1 (on a scale of 1-4), and the public was reminded not to approach the crater. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Semeru | 20 January-26 January 2016 | Continuing ActivityCite this Report
Semeru Eastern Java	PVMBG reported that there were 21 explosions recorded at Semeru during 1-17 January, generating dense gray plumes that rose 100-500 m above the crater and drifted E, N, and W. Seismicity was dominated by signals indicating explosions and emissions. The Alert Level remained at 2 (on a scale from 1-4); visitors and residents were warned to avoid the SE flank within 4 km of the crater. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Sheveluch | 20 January-26 January 2016 | Continuing ActivityCite this Report
Sheveluch Central Kamchatka (Russia)	KVERT reported that during 15-22 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 | 20 January-26 January 2016 | Continuing ActivityCite this Report
Sinabung Northwestern Sumatra	Based on information from PVMBG and satellite images, the Darwin VAAC reported that during 20-22 and 25 January ash plumes from Sinabung rose to altitudes of 3-3.7 km (10,000-12,000 ft) a.s.l. and drifted W, NW, and N. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Tengger Caldera | 20 January-26 January 2016 | Continuing ActivityCite this Report
Tengger Caldera Eastern Java	PVMBG reported that during 14-22 January brownish gray plumes from Tengger Caldera's Bromo cone rose as high as 1.8 km above the crater. Seismicity fluctuated; the number of explosion signals increased and some shallow and deep volcanic earthquakes were recorded. The Alert Level remained at 3 (on a scale of 1-4); residents and visitors were reminded not to approach the crater within a radius of 2.5 km. Based on information from PVMBG and satellite images, the Darwin VAAC reported that during 23 and 25-26 January ash plumes rose to altitudes of 3.6-3.9 km (12,000-13,000 ft) a.s.l. and drifted ENE, E, and SE. 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 19,996 individual reports over 1,215 weeks (average of 16 per week) on 332 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)