All times are local unless otherwise stated.

Copahue (Chile-Argentina) | 22 July-28 July 2020 | New Activity / Unrest Cite this Report
Copahue Andean Southern Volcanic Arc	SERNAGEOMIN and SEGEMAR reported that elevated seismicity (continuous tremor) at Copahue was recorded on 16 July and accompanied by ash emissions observed by local residents. Sulfur dioxide emissions were anomalous on 4, 6, and 20 July; values were 2,100 and 1,713 tons per day on 2 and 4 July, respectively, on the high end of normal values. On 20 July residents of La Araucanía described an odor indicating hydrogen sulfide gas emissions. On 23 July the Alert Level was raised to Yellow (the second lowest level on a four-color scale). ONEMI raised a Yellow Alert (the middle level on a three-color scale) for residents of the Alto Biobío municipality and access to an area within 1 km of El Agrio Crater was restricted to the public. Sources: Servicio Nacional de Geología y Minería (SERNAGEOMIN), Servicio Geológico Minero Argentino (SEGEMAR), Oficina Nacional de Emergencia-Ministerio del Interior (ONEMI)
Nishinoshima (Japan) | 22 July-28 July 2020 | New Activity / Unrest Cite this Report
Nishinoshima Ogasawara Volcanic Arc	Based on satellite data, the Tokyo VAAC reported that during 22-28 July ash plumes from Nishinoshima rose to 2.4-5.2 km (8,000-17,000 ft) a.s.l. and drifted in multiple directions. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Turrialba (Costa Rica) | 22 July-28 July 2020 | New Activity / Unrest Cite this Report
Turrialba Central America Volcanic Arc	OVSICORI-UNA reported that during 22-23 July white steam plumes from Turrialba contained a minor amount of ash on one occasion. Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)

Dukono (Indonesia) | 22 July-28 July 2020 | Continuing ActivityCite this Report
Dukono Halmahera Volcanic Arc	Based on information from PVMBG and satellite data the Darwin VAAC reported that ash plumes from Dukono rose to 2.1-2.3 km (7,000-8,000 ft) a.s.l. and drifted N, NW, and W during 22-26 and 28 July. The Alert Level remained at a 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) | 22 July-28 July 2020 | Continuing ActivityCite this Report
Ebeko Kuril Volcanic Arc	Volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, observed explosions during 17-24 July that sent ash plumes up to 3.5 km (11,500 ft) a.s.l. and drifted in multiple directions. A thermal anomaly over the volcano was identified in satellite images each day; an ash cloud 11x13 km in size drifted 30 km SE on 22 July. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Popocatepetl (Mexico) | 22 July-28 July 2020 | Continuing ActivityCite this Report
Popocatepetl Trans-Mexican Volcanic Belt	CENAPRED reported that each day during 22-27 July there were 2-107 steam-and-gas emissions from Popocatépetl, some of which contained minor amounts of ash. Crater incandescence was visible most nights. Gas, steam, and ash plumes rose as high as 2 km above the crater rim and drifted NW, WSW, and SW. Minor ashfall was reported on 23 and 27 July in areas downwind, including in Tetela del Volcán (20 km SW), Ocuituco (24 km SW), Atlatlahucán (30 km WSW), Yecapixtla (20 km W), Yautepec (50 km WSW), and Jiutepec (60 km WSW), in the state of Morelos, as well as in Tlalmanalco (30 km NW), Juchitepec, Tepetlixpa (20 km W), Atlautla (17 km W), Ozumba (18 km W), and Ecatzingo (15 km SW), in the state of Mexico. Incandescent material was ejected a short distance from the crater on 25 July and was followed by minor ashfall in Ecatzingo, Atlautla, Tepetlixpa, and Juchitepec. Incandescent material was again ejected a short distance from the crater during 26-27 July. Explosions were recorded at 1135 on 27 July and 0511 on 28 July. Minor ashfall was reported in the municipalities of Tlalmanalco (30 km NW), Ayapango (22 km NW), Temamatla (32 km NW), Ecatepec, Valle de Chalco (44 km NW), Texcoco (60 km NNW), Tezoyuca (68 km NNW), Tepetlaoxtoc, Naucalpan (80 km NW), Atizapán (90 km NW), Huixquilucan (85 km NW), Nicolás Romero (95 km NW), and Tlalnepantla (80 km NW) in the state of México. The Alert Level remained at Yellow, Phase Two (middle level on a three-color scale). Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Reventador (Ecuador) | 22 July-28 July 2020 | Continuing ActivityCite this Report
Reventador Andean Northern Volcanic Arc	On 23 July IG reported that activity at Reventador remained high. A slight increase in surficial activity during the previous two weeks was characterized by ash emissions along with pyroclastic flows that descended the W, N, and NE flanks. Ash plumes rose 0.7-1.3 km above the crater rim and drifted several kilometers NW, W, and SW. Incandescent blocks preferentially rolled down the N and NE flanks, though sometimes material was ejected onto all of the flanks. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Rincon de la Vieja (Costa Rica) | 22 July-28 July 2020 | Continuing ActivityCite this Report
Rincon de la Vieja Central America Volcanic Arc	OVSICORI-UNA reported that periodic phreatic explosions at Rincón de la Vieja were recorded by the seismic network and webcams during 22-25 July. Sometimes the events were not visually confirmed due to weather conditions. Small eruptive events were recorded during 0700-0900 on 22 July, and during the first part of the day on 23 July; a minor steam plume was visible at 0536 on 23 July. An eruptive event at 0153 on 25 July produced a plume that rose 1 km above the crater rim. Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)
Semeru (Indonesia) | 22 July-28 July 2020 | Continuing ActivityCite this Report
Semeru Sunda Volcanic Arc	PVMBG reported that white-and-gray ash plumes from Semeru rose 300-500 m above the summit and drifted S and W during 23-26 and 28 July. Weather conditions prevented visual observations on 22 and 27 July. The Alert Level remained at 2 (on a scale of 1-4), and the public was reminded to stay outside of the general 1-km radius from the summit and 4 km on the SSE flank. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Sheveluch (Russia) | 22 July-28 July 2020 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that a thermal anomaly over Sheveluch was identified in satellite images during 17-24 July. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Suwanosejima (Japan) | 22 July-28 July 2020 | Continuing ActivityCite this Report
Suwanosejima Ryukyu Volcanic Arc	JMA reported that nighttime incandescence at Suwanosejima’s Ontake Crater was occasionally visible during 17-24 July. An explosion at 2247 on 22 July generated a gray plume that rose as high as 1.2 km above the crater rim and ejected large rocks as far as 300 m from the crater. The Tokyo VAAC reported that during 25-27 July ash plumes rose to 1.8-2.7 km (6,000-9,000 ft) a.s.l. (1-1.9 km above the crater rim) and drifted NW, N, NE. The Alert Level remained at 2 (on a 5-level scale). Source: Japan Meteorological Agency (JMA)
Villarrica (Chile) | 22 July-28 July 2020 | Continuing ActivityCite this Report
Villarrica Andean Southern Volcanic Arc	ONEMI reported that during 1-15 July activity at Villarrica was characterized by nighttime crater incandescence, gas emission, and sporadic tephra emissions. SERNAGEOMIN reported that a long-period earthquake associated with a moderate explosion in the summit crater was recorded at 1807 on 25 July. The Alert Level remained at Yellow, the second lowest level on a four-color scale. ONEMI maintained an Alert Level Yellow (the middle level on a three-color scale) for the municipalities of Villarrica, Pucón (16 km N), Curarrehue, and the commune of Panguipulli, and changed the exclusion zone for the public to a radius of 500 m around the crater. Sources: Oficina Nacional de Emergencia-Ministerio del Interior (ONEMI), Servicio Nacional de Geología y Minería (SERNAGEOMIN)

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)