All times are local unless otherwise stated.

Brava (Cabo Verde) | 3 August-9 August 2016 | New Activity / Unrest Cite this Report
Brava Cape Verde Province	According to the Universidade de Cabo Verde in a report posted on 4 August, Instituto Nacional da Meteorologia e Geofísica (INMG) recorded increased seismicity at Brava beginning at dawn on 2 August. In response authorities evacuated 300 people, based on a news report. Earthquakes were felt by residents during 3-4 August. Scientists and technicians from the Universidade de Cabo Verde (UniCV), Instituto Vulcanológico das Canárias (INVOLCAN), and Serviço Nacional da Protecção Civil (SNPC) began monitoring carbon dioxide emissions though found nothing unusual during 4-7 August. Sources: Universidade of Cabo Verde, Africa News
Chikurachki (Russia) | 3 August-9 August 2016 | New Activity / Unrest Cite this Report
Chikurachki Kuril Volcanic Arc	KVERT reported that a moderate explosive eruption at Chikurachki was observed during 27-28 July. Ash plumes rose to altitudes of 4-5 km (13,100-16,400 ft) a.s.l. and drifted NE. Minor ashfall was reported in Severo-Kurilsk (Paramushir Island) on 27 July. After the heightened activity conditions remained quiet through 4 August. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Chirpoi (Russia) | 3 August-9 August 2016 | New Activity / Unrest Cite this Report
Chirpoi Kuril Volcanic Arc	SVERT reported that a thermal anomaly over Snow, a volcano of Chirpoi, was detected in satellite images during 6-7 August. The Aviation Color Code remained at Yellow. Source: Sakhalin Volcanic Eruption Response Team (SVERT)
Gamalama (Indonesia) | 3 August-9 August 2016 | New Activity / Unrest Cite this Report
Gamalama Halmahera Volcanic Arc	Based on analyses of satellite imagery and model data, and information from PVMBG, the Darwin VAAC reported that during 3-4 August ash plumes from Gamalama rose to an altitude of 2.7 km (9,000 ft) a.s.l. and drifted S, SE, E, and NE. On 5 August PVMBG noted that seismicity continued to be elevated although inclement weather prevented visual observations. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Kilauea (United States) | 3 August-9 August 2016 | New Activity / Unrest Cite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	During 3-9 August HVO reported that the lava lake continued to rise and fall, circulate, and spatter in Kilauea’s Overlook vent. Late on 6 August an explosions triggered by a rockfall into the lake ejected voluminous amounts of hot spatter and rock debris onto the SE rim of Halema’uma’u Crater, covering a broad swath 80 m long and 50 m wide around the formerly-closed public overlook area. Several incandescent vents on Pu’u ‘O’o Crater’s floor were evident in webcam images. The 61G lava flow, originating from a vent on Pu’u ‘O’o Crater’s E flank, continued to enter the ocean at Kamokuna in an area that spans 150-240 m wide. A small delta had formed at the entry. An active lobe of lava advanced along the W side of the flow field, crossed the Emergency Access road 500 m W of the main flow, and entered the ocean overnight during 8-9 August. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Aira (Japan) | 3 August-9 August 2016 | Continuing ActivityCite this Report
Aira Ryukyu Volcanic Arc	JMA reported that on 4 August a small-scale explosion occurred at Minamidake summit crater (at Aira Caldera’s Sakurajima volcano) ejecting material as high as 400 m above the crater rim. The Alert Level remained at 3 (on a 5-level scale). Source: Japan Meteorological Agency (JMA)
Alaid (Russia) | 3 August-9 August 2016 | Continuing ActivityCite this Report
Alaid Kuril Volcanic Arc	KVERT reported that moderate activity at Alaid’s summit crater was detected during 29 July-5 August. Satellite images showed a thermal anomaly at the volcano during 2-3 August. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Bagana (Papua New Guinea) | 3 August-9 August 2016 | Continuing ActivityCite this Report
Bagana Solomon Volcanic Arc	Based on analyses of satellite imagery and model data, the Darwin VAAC reported that during 3-8 August ash plumes from Bagana rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted SW, WSW, W, and NW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Dukono (Indonesia) | 3 August-9 August 2016 | Continuing ActivityCite this Report
Dukono Halmahera Volcanic Arc	Based on ground reports from PVMBG, satellite data, and model data, the Darwin VAAC reported that during 3 and 6-9 August ash plumes from Dukono rose to altitudes of 1.8-3.3 km (6,000-11,000 ft) a.s.l. and drifted NW, N, E, and SE. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Etna (Italy) | 3 August-9 August 2016 | Continuing ActivityCite this Report
Etna Sicily Volcanic Province	INGV reported that during mid-July weak ash emissions rose from a vent located high on the E flank of Etna’s New Southeast Crater (NSEC) cone. The emissions continued periodically until early August. Pulsating glow from mild, intra-crater explosions in the Voragine (VOR) crater was recorded during 7-9 August. Source: Sezione di Catania - Osservatorio Etneo (INGV)
Klyuchevskoy (Russia) | 3 August-9 August 2016 | Continuing ActivityCite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	KVERT reported that a Strombolian eruption at Klyuchevskoy continued during 29 July-5 August. Volcanic bombs that were ejected 200-300 m above the summit crater and 50 m above a cinder cone landed in the Apakhonchich drainage on the SE flank. A lava flow traveled down the Apakhonchich drainage. Satellite images showed a large and intense daily thermal anomaly at the volcano, and ash plumes drifting about 200 km NE, E, and NW during 31 July, 1 August, and 3-4 August. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Nevado del Ruiz (Colombia) | 3 August-9 August 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 during 2-8 August seismicity at Nevado del Ruiz remained at similar levels as the week before. Significant amounts of water vapor and gas rose from the crater. A gas, steam, and ash plume rose 850 m above the crater rim and drifted NW and W on 6 August. 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) | 3 August-9 August 2016 | Continuing ActivityCite this Report
Nevados de Chillan Andean Southern Volcanic Arc	Servicio Nacional de Geología and Minería (SERNAGEOMIN) Observatorio Volcanológico de Los Andes del Sur (OVDAS) reported that the seismic stations monitoring Nevados de Chillán recorded an increase in seismic signals indicating explosions and increased emissions from new craters on the E side of Volcán Nuevo and the Volcán Arrau dome complex. During 1-9 August there were 11 explosions detected; the highest energy signal was recorded at 1656 on 8 August and was accompanied by an emission that rose 2 km. That same day the Buenos Aires VAAC reported that a gas-and-ash puff rose to an altitude of 4.2 km (14,000 ft) a.s.l. The Alert Level remained at Yellow, the middle level on a three-color scale, and the public was reminded not to approach the craters within a 3-km radius which had been extended due to the recent activity increase. Sources: Servicio Nacional de Geología y Minería (SERNAGEOMIN), Buenos Aires Volcanic Ash Advisory Center (VAAC)
Pavlof (United States) | 3 August-9 August 2016 | Continuing ActivityCite this Report
Pavlof Aleutian Ridge Volcanic Arc	AVO reported that since an ash-and-steam explosion at Pavlof on 27 July, activity had continued to decline. On 4 August AVO lowered the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory. During 5-9 August seismicity remained low but above background levels. Elevated surface temperatures were observed in one nighttime satellite image during 7-8 August. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Reventador (Ecuador) | 3 August-9 August 2016 | Continuing ActivityCite this Report
Reventador Andean Northern Volcanic Arc	During 3-9 August IG reported a high level of seismic activity including explosions, long-period earthquakes, harmonic tremor, and signals indicating emissions at Reventador; cloud cover sometimes prevented visual observations. Incandescent blocks rolled as far as 1 km down the flanks. Gas, water vapor, and ash plumes rose from the crater during 3-4 and 6-7 August; the plumes rose as high as 1 km on 6 August. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Santa Maria (Guatemala) | 3 August-9 August 2016 | Continuing ActivityCite this Report
Santa Maria Central America Volcanic Arc	INSIVUMEH reported that on 8 August an 18-m-wide hot lahar triggered by rainfall descended the Cabello de Ángel drainage, a tributary of the Nimá I river drainage on the S flank of Santa María’s Santiaguito lava-dome complex, carrying tree trunks and blocks up to 1.5 cm in diameter. Explosions during 8-9 August produced ash plumes that rose as high as 1 km above the crater and drifted 15 km SW, W, and NW. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Sheveluch (Russia) | 3 August-9 August 2016 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that during 29 July-5 August lava-dome extrusion onto Sheveluch’s N flank was accompanied by strong fumarolic activity, dome incandescence, ash explosions, and hot avalanches. Satellite images showed a daily thermal anomaly over the dome. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Sinabung (Indonesia) | 3 August-9 August 2016 | Continuing ActivityCite this Report
Sinabung Sunda Volcanic Arc	Based on satellite images, model data, ground reports from PVMBG, and the Jakarta MWO, the Darwin VAAC reported that during 3-5 and 7 August ash plumes from Sinabung rose to altitudes of 3.7-5.5 km (12,000-18,000 ft) a.s.l. and drifted SE, NE, and NNW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Yasur (Vanuatu) | 3 August-9 August 2016 | Continuing ActivityCite this Report
Yasur Vanuatu Volcanic Arc	On 2 August the Vanuatu Geohazards Observatory stated that the Alert Level for Yasur remained at 2 (on a scale of 0-4) and that explosions continued to be intense. VGO reminded residents and tourists that hazardous areas were near and around the volcanic crater, within a 600-m-radius permanent exclusion zone, and that volcanic ash and gas could reach areas impacted by trade winds. Source: Vanuatu Meteorology and Geohazards Department (VMGD)

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)