All times are local unless otherwise stated.

Fuego (Guatemala) | 21 October-27 October 2015 | New Activity / Unrest Cite this Report
Fuego Central America Volcanic Arc	INSIVUMEH reported that during 21-22 October explosions at Fuego generated ash plumes that rose 350-650 m above the crater. A lava flow advanced in the Santa Teresa (W) drainage. Seismicity increased during 25-26 October, and gas-and-ash plumes rose 1.2 km and drifted S and SW. Lava fountains rose as high as 200 m, feeding 850-m-long lava flows in the Santa Teresa and Trinidad (S) drainages. On 27 October lava fountains rose 300 m, and lava flows advanced as far as 1.5 km in the Santa Teresa, Trinidad, and Las Lajas (S) drainages. Strombolian explosions produced ash plumes that rose almost 1 km high. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Rinjani (Indonesia) | 21 October-27 October 2015 | New Activity / Unrest Cite this Report
Rinjani Sunda Volcanic Arc	PVMBG reported that on 25 October at 1004 an eruption at Rinjani generated an ash plume that rose 200 m above the Barujari crater, inside the caldera. Ash fell on the flanks, especially to the SW. The report noted that no seismic nor surficial precursory events were detected. The Alert Level was raised to 2 (on a scale of 1-4). Based on satellite observations, the Darwin VAAC reported that on 26 and 28 October ash plumes rose to altitudes of 3-4 km (10,000-13,000 ft) a.s.l. and drifted 45-75 km SW and WSW. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Turrialba (Costa Rica) | 21 October-27 October 2015 | New Activity / Unrest Cite this Report
Turrialba Central America Volcanic Arc	OVSICORI-UNA reported that a small ash eruption at Turrialba began at 1153 on 23 October. An explosion at 1710 on 24 October produced an ash plume that rose 800 m above the crater and drifted SSW. Multiple explosive events occurred during 24-25 October; poor weather conditions sometimes prevented views of the activity. On 25 October 10-minute-long explosive events began at 0730 and 0927 and generated ash plumes that rose 1.5 km and 200 m, respectively; plumes drifted NW and W. Pyroclastic flows from collapsing ash columns were generated both times. Volcanologists conducting fieldwork on 26 October observed morphological changes at the S edge of the W crater and nearby areas due to the recent activity. They noted fresh light-colored ash and tephra deposits on the steep wall of the active crater. Three small explosions generated ash, steam, and gas emissions. Tephra was deposited as far as 400 m away in various directions from the crater. Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)

Asosan (Japan) | 21 October-27 October 2015 | Continuing ActivityCite this Report
Asosan Nankai Volcanic Arc	JMA reported that since the 14 September eruptive activity at Asosan’s Nakadake Crater continued. On 23 October explosions generated ash plumes that rose 1.4-1.6 km above the crater, producing tepha-fall in areas to the W and NW. The Alert Level remained at 3 (on a scale of 1-5). Source: Japan Meteorological Agency (JMA)
Bagana (Papua New Guinea) | 21 October-27 October 2015 | Continuing ActivityCite this Report
Bagana Solomon Volcanic Arc	Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 21 and 24-26 October ash plumes from Bagana rose to altitudes of 1.5-2.4 km (5,000-8,000 ft) a.s.l. and drifted 45-85 km W and NW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Batu Tara (Indonesia) | 21 October-27 October 2015 | Continuing ActivityCite this Report
Batu Tara Sunda Volcanic Arc	Based on analyses of satellite imagery, the Darwin VAAC reported that during 22-26 October ash plumes from Batu Tara rose to altitudes of 1.5 km (5,000 ft) a.s.l. and drifted 35-65 km SW and W. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Colima (Mexico) | 21 October-27 October 2015 | Continuing ActivityCite this Report
Colima Trans-Mexican Volcanic Belt	Based on satellite images, wind data, webcam views, and notices from the Mexico City MWO and Colima Tower, the Washington VAAC reported continuing emission from Colima. On 21 October an ash plume drifted N and quickly dissipated, and on 24 October an ash puff dissipated to the E. On 25 October a gas plume with minor amounts of ash was detected. An emission drifted NE on 28 October. Source: Washington Volcanic Ash Advisory Center (VAAC)
Cotopaxi (Ecuador) | 21 October-27 October 2015 | Continuing ActivityCite this Report
Cotopaxi Northern Andean Volcanic Arc	IG reported that during 21-27 October gas, steam, and ash plumes rose from Cotopaxi almost daily as high as 2 km above the crater and drifted NW, W, and SW. A small lahar detected on 24 October descended the NW flank but stayed with Cotopaxi National Park boundaries. A small lahar descended the W flank the next day. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Dukono (Indonesia) | 21 October-27 October 2015 | Continuing ActivityCite this Report
Dukono Halmahera Volcanic Arc	Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 21-26 and 28 October ash plumes from Dukono rose to altitudes of 1.5-2.4 km (5,000-8,000 ft) a.s.l. and drifted 25-140 km W, NW, NE, and E. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Karymsky (Russia) | 21 October-27 October 2015 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that moderate explosive activity at Karymsky continued during 16-23 October. Satellite images showed ash plumes drifting 100 km SE during 19-20 and 22 October, and a thermal anomaly over the volcano on 20 and 22 October. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea (United States) | 21 October-27 October 2015 | 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 21-27 October. The lava lake continued to circulate and spatter in the Overlook vent; small sections of the inner wall veneer fell into the lake on 22 October causing increased spattering and sloshing. The June 27th NE-trending lava flow continued to be active within 2.2-6.3 km NE of Pu'u 'O'o Crater. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Nevado del Ruiz (Colombia) | 21 October-27 October 2015 | 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 20-26 October seismicity at Nevado del Ruiz was characterized by long-period earthquakes and short-duration volcanic tremor associated with gas-and-ash emissions. Earthquakes occurred at depths between 1.1 and 8.8 km. The largest event was recorded at 0953 on 21 October, a local M 2.3, near Arenas Crater at a depth of 3.4 km. Significant amounts of water vapor and gas rose from the crater during the week. A gas, steam, and ash plume rose 2 km on 22 October. The Alert Level remained at III (Yellow; "changes in the behavior of volcanic activity"). Source: Servicio Geológico Colombiano (SGC)
Piton de la Fournaise (France) | 21 October-27 October 2015 | Continuing ActivityCite this Report
Piton de la Fournaise Reunion Hotspot Volcano Group	OVPDLF reported that the effusive phase of the eruption at Piton de la Fournaise ended at 0802 on 19 October; around the same time tremor started to increase, and then gradually increased again starting at 0800 on 22 October. Observers reported that a small explosion in the vent ejected spatter. Source: Observatoire Volcanologique du Piton de la Fournaise (OVPF)
Popocatepetl (Mexico) | 21 October-27 October 2015 | Continuing ActivityCite this Report
Popocatepetl Trans-Mexican Volcanic Belt	CENAPRED reported that during 21-22 and 24-27 October the seismic network at Popocatépetl recorded 12-69 daily emissions; 128 were detected on 23 October. Cloud cover often prevented visual observations. Variable nighttime crater incandescence was observed on some days. Two, four, and six explosions were detected on 21, 22, and 23 October, respectively. Four explosions were detected during 26-27 October. The Alert Level remained at Yellow, Phase Two. Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Santa Maria (Guatemala) | 21 October-27 October 2015 | Continuing ActivityCite this Report
Santa Maria Central America Volcanic Arc	INSIVUMEH reported that on 21 October heavy rainfall in the area triggered steaming hot lahars which descended Santa María’s Nima I and San Isidro drainages. Both lahars carried blocks as large as 1.5 m in diameter; the Nimá I deposit was 18 m wide and 1.5 m deep. Explosions during 21-22 October generated ash plumes that rose 700 m above the crater and drifted SW, causing ashfall in El Rosario Palajunoj finca. Ash plumes from explosions drifted S and SE during 25-26 October; ashfall was reported in areas downwind. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Shishaldin (United States) | 21 October-27 October 2015 | Continuing ActivityCite this Report
Shishaldin Aleutian Ridge Volcanic Arc	AVO reported that seismicity at Shishaldin continued to be slightly elevated over background levels during 21-27 October, indicating that low-level eruptive activity confined to the summit crater continued. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Sinabung (Indonesia) | 21 October-27 October 2015 | Continuing ActivityCite this Report
Sinabung Sunda Volcanic Arc	Based on information from PVMBG, and analyses of satellite imagery and wind data, the Darwin VAAC reported that on 21 October an ash plume from Sinabung rose to an altitude of 6.1 (20,000 ft) a.s.l. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Ubinas (Peru) | 21 October-27 October 2015 | Continuing ActivityCite this Report
Ubinas Central Andean Volcanic Arc	Instituto Geofísico del Perú (IGP) Observatorio Volcanológico del Sur (OVS) reported that during 20-26 October seismicity at Ubinas decreased overall; the level of long-period earthquakes remained high while hybrid and volcano-tectonic signals were at low levels. On 21 October an ash plume rose 1 km and drifted NE and E. Bluish gas-and-steam plumes rose from the crater during the rest of the period. Source: Instituto Geofísico del Perú (IGP)

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.

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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)