All times are local unless otherwise stated.

Kavachi (Solomon Islands) | 2 September-8 September 2020 | New Eruptive Activity Cite this Report
Kavachi Solomon Volcanic Province	Satellite data showed discolored water around Kavachi possibly beginning in early September; by 7 September discolored plumes in the water were visible E of the submarine cone. Source: Copernicus
Sinabung (Indonesia) | 2 September-8 September 2020 | New Eruptive Activity Cite this Report
Sinabung Sunda Volcanic Arc	PVMBG reported that white plumes rose as high as 600 m above Sinabung’s summit and drifted in multiple directions on most days during 2-8 September. At 0513 on 5 September an eruption produced a gray ash plume that rose at least 800 m and drifted NNE. Emissions were brown and white on 6 September. The Alert Level remained at 3 (on a scale of 1-4), with a general exclusion zone of 3 km and extensions to 5 km on the SE sector and 4 km in the NE sector. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Aira (Japan) | 2 September-8 September 2020 | Continuing Eruptive Activity Cite this Report
Aira Ryukyu Volcanic Arc	JMA reported that 12 eruptive events at Minamidake Crater (at Aira Caldera’s Sakurajima volcano) during 31 August-7 September produced plumes that rose as high as 1.7 km above the crater rim. The daily sulfur dioxide emission rate was 1,400 tons/day on 31 August. The Alert Level remained at 3 (on a 5-level scale). Source: Japan Meteorological Agency (JMA)
Cleveland (United States) | 2 September-8 September 2020 | Continuing Eruptive Activity Cite this Report
Cleveland Aleutian Ridge Volcanic Arc	AVO lowered both the Volcano Alert Level and the Aviation Color Code for Cleveland to Unassigned on 3 September, noting a lack of unrest over the past few months. A short-lived explosion was recorded on 1 June; satellite images showed no signs of elevated temperatures nor surficial changes in the summit crater since then. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Copahue (Chile-Argentina) | 2 September-8 September 2020 | Continuing Eruptive Activity Cite this Report
Copahue Southern Andean Volcanic Arc	SERNAGEOMIN reported continuing activity at Copahue during 16-31 August. Webcams recorded gas-and-ash plumes rising as high as 1.7 km, sometimes associated with nighttime crater incandescence. The plumes drifted in multiple directions as far as 4.3 km N, 9 km NE, 8 km E, 4 km SE, 4 km SW, 9 km W, and 4.4 km NW. Sulfur dioxide emissions were high, averaging 2,641 tonnes per day (ranging from 2,029 to 3,253 tonnes per day), with a high value of 4,627 on 27 August. The Alert Level was remained at Yellow (the second lowest level on a four-color scale). ONEMI maintained the 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), Oficina Nacional de Emergencia-Ministerio del Interior (ONEMI)
Dukono (Indonesia) | 2 September-8 September 2020 | Continuing Eruptive Activity Cite this Report
Dukono Halmahera Volcanic Arc	Based on satellite and wind model data, and information from PVMBG, the Darwin VAAC reported that during 2-8 September ash plumes from Dukono rose 2.1 km (7,000 ft) a.s.l. and drifted NW, W, and SW. 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: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)
Ebeko (Russia) | 2 September-8 September 2020 | Continuing Eruptive Activity Cite this Report
Ebeko Kuril Volcanic Arc	Volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, observed explosions during 27-28 and 30-31 August, and 1-2 September. Ash plumes rose up to 3 km (10,000 ft) a.s.l. and drifted N, NE, SE, and S. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Karymsky (Russia) | 2 September-8 September 2020 | Continuing Eruptive Activity Cite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that explosions at Karymsky were last recorded on 29 July. A thermal anomaly was weak for most of August and undetectable after 21 August. The Aviation Color Code was lowered to Green (the lowest level on a four-color scale) on 3 September. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Makushin (United States) | 2 September-8 September 2020 | Continuing Eruptive Activity Cite this Report
Makushin Aleutian Ridge Volcanic Arc	Seismicity at Makushin returned to background levels after steadily declining for almost three months following a sequence of earthquakes about 10 km E of the summit at a depth of 8 km that had started on 15 June. AVO lowered the Aviation Color Code and Volcano Alert Level remained at Green and Normal, respectively, on 8 September. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Rincón de la Vieja (Costa Rica) | 2 September-8 September 2020 | Continuing Eruptive Activity Cite this Report
Rincón de la Vieja Central America Volcanic Arc	OVSICORI-UNA reported that on 3 September geologists observed Rincón de la Vieja from the summit and noted that the acid lake in the main crater had a low water level, was actively convecting, and exhibited strong gas emissions. The temperature of the lake was 60 degrees Celsius. Vigorous fumaroles on the inner W wall of the crater were 120 degrees Celsius. At 0559 on 8 September an eruption produced a plume that rose 500 m above the crater rim. Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)
Sangay (Ecuador) | 2 September-8 September 2020 | Continuing Eruptive Activity Cite this Report
Sangay Northern Andean Volcanic Arc	IG reported a high level of activity at Sangay during 2-8 September. Seismicity was characterized by high levels of explosions, harmonic tremor, long-period earthquakes, and signals indicating emissions. Weather clouds often prevented visual observations of the volcano, but the Washington VAAC and IG webcams recorded daily ash plumes that rose 600-1,500 m above the summit and drifted NW, W, and S. Lahars were periodically generated by heavy rains. On 2 September pyroclastic flows descended the SE flank. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Semeru (Indonesia) | 2 September-8 September 2020 | Continuing Eruptive Activity Cite this Report
Semeru Sunda Volcanic Arc	PVMBG reported that at 0541 on 8 September an ash plume from Semeru rose 400 m above the summit and drifted S. The Alert Level remained at 2 (on a scale of 1-4). Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Sheveluch (Russia) | 2 September-8 September 2020 | Continuing Eruptive Activity Cite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that a thermal anomaly over Sheveluch was identified in satellite images daily during 28 August-4 September. 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) | 2 September-8 September 2020 | Continuing Eruptive Activity Cite this Report
Suwanosejima Ryukyu Volcanic Arc	JMA reported periodic nighttime incandescence at Suwanosejima’s Ontake Crater during 28 August-4 September, and there was a total of 11 eruptions. An eruption at 0234 on 4 September generated a grayish white ash plume that rose 1.3 km above the crater rim before entering weather clouds. The Alert Level remained at 2 (on a 5-level scale). Source: Japan Meteorological Agency (JMA)

Since the Weekly Volcanic Activity Report began in November 2000, there have been 22,882 individual reports over 1,336 weeks (average of 17 per week) on 351 different volcanoes.

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The RSS (Really Simple Syndication) feed is identical to the Weekly Volcanic Activity Report minus some features including the header information (latitude and longitude and summit elevation), the Geological Summary, and a link to the GVP volcano profile page. At the end of each report is a list of the sources used. Each report includes a link from the volcano's name back to the more complete information on the GVP website.

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Criteria

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 essentially continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Submarine activity is reported when information is available. 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.

Reports categorized as "Activity (New)" indicate eruptive activity that has occurred after at least 3 months of quiescence. Once a volcano is included in this section, updates will remain on that list unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Activity (Continuing)" section. Reports are included in the "Unrest" sections (New or Continuing) if the volcano is undergoing non-eruptive activity such as seismicity or deformation that is unusually high for that volcano or is increasing. The "Other" category includes non-eruptive and non-unrest reports, such as Alert Level decreases or previous ash deposits resuspended by winds. Reports through 2025 were only divided into "New Activity/Unrest" and "Continuing Activity", which have been automatically converted to the "Activity (New)" and "Activity (Continuing)" groups, respectively, without a review of content that might change the category to "Unrest" or "Other".

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 have the relevant information at the time.

Disclaimers

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. 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.

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