All times are local unless otherwise stated.

Bezymianny (Russia) | 27 July-2 August 2016 | New Activity / Unrest Cite this Report
Bezymianny Eastern Kamchatka Volcanic Arc	Based on information from the Yelizovo Airport (UHPP), the Tokyo VAAC reported that on 30 July an ash plume from Bezymianny rose to an altitude of 3 km (10,000 ft) a.s.l. drifted E. The Aviation Color Code level remained at Yellow. Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Kamchatkan Volcanic Eruption Response Team (KVERT)
Chikurachki (Russia) | 27 July-2 August 2016 | New Activity / Unrest Cite this Report
Chikurachki Kuril Volcanic Arc	KVERT reported that an explosive eruption at Chikurachki’s summit crater continued during 22-29 July. Satellite images showed an ash plume drifting 176 km NE on 27 July. 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) | 27 July-2 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 27-28 and 31 July. The Aviation Color Code remained at Yellow. Source: Sakhalin Volcanic Eruption Response Team (SVERT)
Fuego (Guatemala) | 27 July-2 August 2016 | New Activity / Unrest Cite this Report
Fuego Central America Volcanic Arc	On 28 July CONRED noted that in recent days activity at Fuego was characterized by a high level of explosive activity. At 0545 activity increased further, heralding a shift to Strombolian activity and the beginning of the 12th eruptive episode at Fuego in 2016. Explosions produced ash plumes that rose 1 km and drifted 15 km SW, W, and NW, and caused shock waves detected in nearby areas. Pyroclastic flow descended the Las Lajas (SE) drainage, and ashfall was reported in Sangre de Cristo (8 km WSW) and San Pedro Yepocapa (8 km N). INSIVUMEH reported that during 28-29 July lava was ejected 500 m above the crater; lava flows traveled 3 km down the Santa Teresa (W) and Las Lajas drainages. Pyroclastic flows continued to descend the flanks. Ash plumes rose 1.7 km and drifted 35 km W and SW. Activity declined at 1500 on 29 July; ash plumes rose 800 m. On 30 July there were 3-5 explosions detected per hour, generating gray ash plumes that rose 550-850 m and drifted 10 km W and SW. Incandescent material was ejected as high as 150 m above the crater. Lava flows remained incandescent as far as 1.8 km in the drainages. Ash fell in Morelia (9 km SW), Santa Sofía (12 km SW), El Porvenir (8 km ENE), and Panimaché I and II (8 km SW). INSIVUMEH noted that at 0130 on 30 July the activity ended. Minor explosions generated ash plumes that did not rise higher than 750 m. Sources: Coordinadora Nacional para la Reducción de Desastres (CONRED), Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Kilauea (United States) | 27 July-2 August 2016 | New Activity / Unrest Cite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	HVO reported that during 27 July-2 August the lava lake continued to rise and fall, circulate, and spatter in Kilauea’s Overlook vent. 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 the Kamokuna area; the flow at the ocean entry continued to widen and by 30 July was 240 m across. Nighttime webcam views of the flow field showed incandescent areas mostly on the coastal plain. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Rinjani (Indonesia) | 27 July-2 August 2016 | New Activity / Unrest Cite this Report
Rinjani Sunda Volcanic Arc	Based on satellite and pilot observations, the Darwin VAAC reported that an eruption at Rinjani on 1 August generated an ash plume that rose to an altitude of 9.8 km (32,000 ft) a.s.l. and drifted S. Ash plumes were first visible in satellite images at 1150, and according to PVMBG passengers aboard a plane noted that ash plumes rose 2 km above the crater. BNPB noted that the Lombok International Airport closed at 1655 and was scheduled to reopen at 1000 the next day. Later on 1 August ash plumes rose to altitudes of 4.3-6.1 km (14,000-20,000 ft) a.s.l. and drifted S, SW, and W. No plumes were visible at 1730; conditions had returned to normal levels although BNPB warned that the public should stay at least 1.5 km away from the volcano. Sources: Darwin Volcanic Ash Advisory Centre (VAAC), Badan Nacional Penanggulangan Bencana (BNPB), Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Aira (Japan) | 27 July-2 August 2016 | Continuing ActivityCite this Report
Aira Ryukyu Volcanic Arc	JMA reported that on 26 July an explosive eruption at Showa Crater (at Aira Caldera’s Sakurajima volcano) ejected tephra 800 m away from the crater and generated an ash plume that rose 5 km above the crater rim. Significant amounts of ash fell in the W and SW parts of the island and in multiple areas of Kagoshima (10-12 km W). The Alert Level remained at 3 (on a 5-level scale). Source: Japan Meteorological Agency (JMA)
Alaid (Russia) | 27 July-2 August 2016 | Continuing ActivityCite this Report
Alaid Kuril Volcanic Arc	KVERT reported that Strombolian activity at a new cinder cone in Alaid’s summit crater was detected during 22-29 July, with lava flowing down the SW flank. On 26 July satellite images showed a thermal anomaly at the volcano, and a gas-and-steam plume that drifted 155 km NE. 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) | 27 July-2 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 29 July-1 August ash plumes from Bagana rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted SW, W, and NW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Colima (Mexico) | 27 July-2 August 2016 | Continuing ActivityCite this Report
Colima Trans-Mexican Volcanic Belt	The Washington VAAC reported that steam-and-gas puffs containing minor amounts of ash rose from Colima on 28 July. The next day an ash plume identified in satellite images and recorded by the webcam rose to an altitude of 5.8 km (19,000 ft) a.s.l. and drifted NW. On 31 July Colima Towers and the Mexico City MWO reported that ash plumes rose to altitudes of 5.2-7.3 km (17,000-24,000 ft) a.s.l. and drifted W and WSW. Source: Washington Volcanic Ash Advisory Center (VAAC)
Dukono (Indonesia) | 27 July-2 August 2016 | Continuing ActivityCite this Report
Dukono Halmahera Volcanic Arc	Based on ground reports from PVMBG and model data, the Darwin VAAC reported that during 27-29 July ash plumes from Dukono rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted N and E. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Gamalama (Indonesia) | 27 July-2 August 2016 | Continuing ActivityCite this Report
Gamalama Halmahera Volcanic Arc	PVMBG reported that at 0628 on 3 August a weak explosion at Gamalama generated an ash plume that rose 500-600 m above the crater and drifted SE and S. Ash emissions declined at 0655. Ashfall was reported in areas on the SSE flank including Ake Huda. The report also noted a brief airport closing. The Alert Level remained at 2 (on a scale of 1-4); visitors and residents were warned not to approach the crater within a 1.5-km radius. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Klyuchevskoy (Russia) | 27 July-2 August 2016 | Continuing ActivityCite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	KVERT reported that a Strombolian eruption at Klyuchevskoy continued during 22-29 July. 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 over 140 km E during 22-23 and 26 July. The Aviation Color Code was raised to Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Nevado del Ruiz (Colombia) | 27 July-2 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 26 July-1 August seismicity levels at Nevado del Ruiz slightly increased as compared to the week before. Significant amounts of water vapor and gas rose from the crater. A gas, steam, and ash plume rose 700 m above the crater rim and drifted NW and W on 29 July. 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) | 27 July-2 August 2016 | Continuing ActivityCite this Report
Nevados de Chillan Andean Southern Volcanic Arc	The Buenos Aires VAAC reported that on 1 August a webcam recorded an ash puff from Nevados de Chillán that rose to an altitude of 3.6 km (12,000 ft) a.s.l., and then emissions of gas and minor amounts of ash at crater level. Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
Pavlof (United States) | 27 July-2 August 2016 | Continuing ActivityCite this Report
Pavlof Aleutian Ridge Volcanic Arc	AVO reported that on 28 July vigorous steam-rich gas plumes from Pavlof were visible in webcam images from Cold Bay (60 km SW) and Black Hills (35 km NNE). The report also noted that recent satellite images and a pilot observation indicated minor ash emissions associated with degassing which rose to an altitude less that 4.5 km (15,000 ft) a.s.l. The Aviation Color Code was raised to Orange and Volcano Alert Level was raised to Watch. On 29 July seismicity began to decrease. On 30 July minor steam emissions were visible in webcam images from Black Hills, and on 2 August a weak thermal anomaly was detected. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Sheveluch (Russia) | 27 July-2 August 2016 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that during 22-29 July 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) | 27 July-2 August 2016 | Continuing ActivityCite this Report
Sinabung Sunda Volcanic Arc	Based on satellite and webcam images, model data, and ground reports from PVMBG, the Darwin VAAC reported that during 27-28 July and 1 August ash plumes from Sinabung rose to altitudes of 4-4.3 km (13,000-14,000 ft) a.s.l. and drifted NE, E, and SSE. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Suwanosejima (Japan) | 27 July-2 August 2016 | Continuing ActivityCite this Report
Suwanosejima Ryukyu Volcanic Arc	Based on JMA notices and satellite-image analyses, the Tokyo VAAC reported that during 1-2 August ash plumes from Suwanosejima rose to altitudes of 1.5-3.4 km (5,000-11,000 ft) a.s.l. and drifted W and SE. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Tengger Caldera (Indonesia) | 27 July-2 August 2016 | Continuing ActivityCite this Report
Tengger Caldera Sunda Volcanic Arc	Based on analyses of satellite images and information from PVMBG, the Darwin VAAC reported that during 27-31 July and 1 August ash plumes from Tengger Caldera’s Bromo cone rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted as far as 55 km NW, W, and SW. Source: Darwin Volcanic Ash Advisory Centre (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.

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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)