All times are local unless otherwise stated.

Manam (Papua New Guinea) | 17 July-23 July 2019 | New Activity / Unrest Cite this Report
Manam Bismarck Volcanic Arc	The Darwin VAAC reported that on 21 July an ash plume from Manam rose to an altitude of 4.3 km (14,000 ft) a.s.l. and drifted SW and W, based on satellite data and weather models. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Semisopochnoi (United States) | 17 July-23 July 2019 | New Activity / Unrest Cite this Report
Semisopochnoi Aleutian Ridge Volcanic Arc	AVO reported that data from local seismic and infrasound sensors likely detected a small explosion at Semisopochnoi on 16 July. No ash was visible in cloudy satellite images although none was expected from an explosion of its size. A small plume drifted 18 km from the vent but had no indication of ash. A strong tremor signal was recorded at 2339 on 17 July and an infrasound signal was detected from an array located 260 km E on Adak Island. The event likely produced ash emissions, though none were visible above the cloud deck at 3 km (10,000 ft) a.s.l. Seismic activity continued to increase. On 18 July a short-lived, low-level eruption prompted AVO to raise the Aviation Color Code to Orange (the second highest level on a four-color scale) and the Volcano Alert Level to Watch (the second highest level on a four-level scale). A low-level plume was visible in occasional cloud-free satellite images. Seismic activity decreased abruptly that night and ground-coupled airwaves stopped being detected on adjacent islands, suggesting that the eruption had paused or ended. Seismic activity remained low at least through 21 July. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Shishaldin (United States) | 17 July-23 July 2019 | New Activity / Unrest Cite this Report
Shishaldin Aleutian Ridge Volcanic Arc	AVO reported that weak tremor continued to be recorded at Shishaldin during 17-23 July and elevated surface temperatures were observed in multiple satellite images. Cloudy conditions typically obscured webcam views of the volcano, but when conditions were clear a small steam plume at the summit was visible. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Stromboli (Italy) | 17 July-23 July 2019 | New Activity / Unrest Cite this Report
Stromboli Aeolian Volcanic Arc	INGV reported that multiple vents on Stromboli’s crater terrace were active during 15-21 July, though the exact number was unknown due to the unfavorable positions of the cameras. Vents in Area N (north crater area, NCA) produced low-to-medium-intensity explosions at a rate of 4-10 events per hour, ejecting lapilli and bombs less than 150 m high. The vents of Area C-S (South Central crater area) generated explosions of intensities variable between low and very high and at a rate of 6-17 events per hour. Tephra was ejected over 200 m high. Lava from Area C-S vents continued to travel down the S part of the Sciara del Fuoco shedding blocks that rolled all the way to the coastline. Source: Sezione di Catania - Osservatorio Etneo (INGV)
Ubinas (Peru) | 17 July-23 July 2019 | New Activity / Unrest Cite this Report
Ubinas Andean Central Volcanic Arc	IGP reported that during 17-19 July gas-and-ash emissions occasionally rose from Ubinas’s summit crater and drifted N, E, and SE. Beginning at 0227 on 19 July as many as three explosions (two were recorded at 0227 and 0235) generated ash plumes that rose to 5.8 km above the crater rim. The Buenos Aires VAAC reported that ash plumes rose as high as 6.5 km above the crater rim (or to 40,000 ft. a.s.l.) based on satellite images. The Alert Level was raised to Orange (on a 4-level scale). Ash plumes drifted as far as 250 km E and SE, reaching Bolivia. Ashfall was reported in areas downwind including the towns of Ubinas (6.5 km SSE), Escacha, Anascapa (11 km SE), Tonohaya (7 km SSE), Sacohaya, San Miguel (10 km SE), Huarina, and Matalaque, causing some families to evacuate. The VAAC reported that during 20-23 July ash plumes rose to 7.3-9.5 km (24,000-31,000 ft) a.s.l. and drifted E, ESE, and SE. Sources: Instituto Geofísico del Perú (IGP), Gobierno Regional de Moquegua, Buenos Aires Volcanic Ash Advisory Center (VAAC), Instituto Nacional de Defensa Civil Perú (INDECI)

Aira (Japan) | 17 July-23 July 2019 | Continuing ActivityCite this Report
Aira Ryukyu Volcanic Arc	JMA reported that during 19-22 July as many as four explosions at Minamidake crater (at Aira Caldera’s Sakurajima volcano) generated ash plumes that rose at least to 1.5 km above the crater rim and ejected material 1.1 km from the vent. The Alert Level remained at 3 (on a 5-level scale). Source: Japan Meteorological Agency (JMA)
Dukono (Indonesia) | 17 July-23 July 2019 | Continuing ActivityCite this Report
Dukono Halmahera Volcanic Arc	Based on satellite and wind model data, and notices from PVMBG, the Darwin VAAC reported that during 17-22 July ash plumes from Dukono rose to altitudes of 1.5-2.1 km (5,000-7,000 ft) a.s.l. and drifted mainly W, NW, and N. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to remain outside of the 2-km exclusion zone. Sources: Darwin Volcanic Ash Advisory Centre (VAAC), Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Ebeko (Russia) | 17 July-23 July 2019 | Continuing ActivityCite this Report
Ebeko Kuril Volcanic Arc	KVERT reported that a thermal anomaly over Ebeko was identified in satellite images during 13-16 and 18 July. Volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E, observed explosions during 15-16 July that sent ash plumes up to 2 km (6,600 ft) a.s.l. The plumes drifted S and SE. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Etna (Italy) | 17 July-23 July 2019 | Continuing ActivityCite this Report
Etna Sicily Volcanic Province	INGV reported that during 15-17 July sporadic explosions at Etna’s New Southeast Crater (NSEC) were accompanied by small ash puffs that quickly dissipated. Strombolian activity at NSEC increased during the morning of 18 July with explosions occurring at a rate of one every 1-2 minutes. In the following hours the rate of explosions increased, and by the evening Strombolian activity was almost continuous. The activity continued to intensify until 2300 when a sharp decrease occurred. At 0009 on 19 July lava flowed from a new vent that opened on the lower NE flank of NSEC, and traveled towards the Valle del Leone. Within a few hours explosive activity again increased at NSEC; ash emissions occasionally rose from the Northeast Crater (NEC) and Bocca Nuova Crater. Explosive activity decreased and had ceased by noon. A sudden increase in explosive activity was recorded that afternoon and by the evening three vents within NSEC were producing Strombolian activity and sporadic ash emissions. Ashfall was reported in areas on the S flank. Explosive activity at NSEC again declined in the late evening. NEC produced abundant ash emissions until the morning of 20 July. Just before 0800 on 20 July a new phase of explosive activity began at NSEC and lava effusion at the new vent on the NE flank increased. Later that morning explosive activity completely ceased; by evening the lava flow was only weakly fed. Source: Sezione di Catania - Osservatorio Etneo (INGV)
Karymsky (Russia) | 17 July-23 July 2019 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that ash plumes from Karymsky drifted 60 km in multiple directions during 13-17 July. A thermal anomaly was identified in satellite images during 14 and 16-18 July. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Klyuchevskoy (Russia) | 17 July-23 July 2019 | Continuing ActivityCite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	KVERT reported that a weak thermal anomaly over Klyuchevskoy was visible in satellite images on 15 July. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Merapi (Indonesia) | 17 July-23 July 2019 | Continuing ActivityCite this Report
Merapi Sunda Volcanic Arc	PVMBG reported that during 15-21 July the lava-dome volume at Merapi did not change and was an estimated 475,000 cubic meters, based on analyses of drone images. Extruded lava fell into the upper parts of the SE-flank, generating three block-and-ash flows that traveled 1.2 km down the Gendol drainage on 21 July. White plumes rose as high as 50 m above the summit. The Alert Level remained at 2 (on a scale of 1-4), and residents were warned to remain outside of the 3-km exclusion zone. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Pacaya (Guatemala) | 17 July-23 July 2019 | Continuing ActivityCite this Report
Pacaya Central America Volcanic Arc	INSIVUMEH reported that during 17-23 July Strombolian explosions at Pacaya’s Mackenney Crater ejected material as high as 25 m above the crater rim. As many as four lava flows traveled down the NW and N flanks; two of the flows were 300 m long. Minor avalanches of material from the lava flow fronts descended the flanks. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Sangeang Api (Indonesia) | 17 July-23 July 2019 | Continuing ActivityCite this Report
Sangeang Api Sunda Volcanic Arc	The Darwin VAAC reported that during 17-18 and 20-22 July ash plumes from Sangeang Api were identified by pilots and in satellite images rising to 2.1-4.6 km (7,000-15,000 ft) a.s.l. and drifting NW, W, and SW. The Alert Level remained at 2 (on a scale of 1-4). Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Sheveluch (Russia) | 17 July-23 July 2019 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that a thermal anomaly over Sheveluch’s lava dome was identified daily in satellite images during 13-18 July. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Tengger Caldera (Indonesia) | 17 July-23 July 2019 | Continuing ActivityCite this Report
Tengger Caldera Sunda Volcanic Arc	PVMBG reported that rain triggered a lahar at 1700 on 19 July that originated on the SW flank of Tengger Caldera’s Bromo cone. The Alert Level remained at 2 (on a scale of 1-4), and visitors were warned to stay outside of a 1-km radius of the crater. Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)
Villarrica (Chile) | 17 July-23 July 2019 | Continuing ActivityCite this Report
Villarrica Andean Southern Volcanic Arc	POVI reported a high level of incandescence from Villarrica’s summit crater on 22 July and lava bombs on the flanks just below the crater rim. Strombolian explosions intensified on 23 July, with material continuing to be ejected onto the flanks. Source: Proyecto Observación Villarrica Internet (POVI)

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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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)