All times are local unless otherwise stated.

Atka Volcanic Complex (United States) | 28 October-3 November 2020 | New Eruptive Activity Cite this Report
Atka Volcanic Complex Aleutian Ridge Volcanic Arc	On 28 October AVO raised the Aviation Color Code and Volcano Alert Level for Korovin to Yellow and Advisory, respectively, noting that activity was above background levels. Discrete earthquakes were detected over the previous two weeks and sulfur dioxide emissions were identified four times in satellite data on 15, 20, and 26 October. Low-level seismicity continued and no surficial activity was evident in cloudy or partly cloudy satellite images through 3 November. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Bezymianny (Russia) | 28 October-3 November 2020 | New Eruptive Activity Cite this Report
Bezymianny Eastern Kamchatka Volcanic Arc	KVERT reported that a thermal anomaly over Bezymianny was identified in satellite images during 22-24 and 27-29 October. The N part of the lava dome was active and possibly advanced. The Aviation Color Code remained at Yellow (the second lowest level on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Karymsky (Russia) | 28 October-3 November 2020 | New Eruptive Activity Cite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that during 23 and 25-26 October explosions at Karymsky produced ash plumes that rose to 5 km (16,400 ft) a.s.l. and drifted 75 km SE, NE, and NW. A thermal anomaly was identified in satellite images during 23-24, 26, and 28 October. 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) | 28 October-3 November 2020 | New Eruptive Activity Cite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	KVERT reported that Strombolian activity at Klyuchevskoy continued during 23-30 October and lava advanced down the Apakhonchich drainage on the SE flank. Gas-and-steam emissions contained some ash. A large, bright thermal anomaly was identified daily in satellite images. The Aviation Color Code remained at Orange (the second highest level on a four-color scale) on 8 October. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Aira (Japan) | 28 October-3 November 2020 | Continuing Eruptive Activity Cite this Report
Aira Ryukyu Volcanic Arc	JMA reported that during 26 October-2 November incandescence from Minamidake Crater (at Aira Caldera’s Sakurajima volcano) was visible nightly. An eruption at 0620 on 30 October produced a plume that rose 1 km above the crater rim. The Alert Level remained at 3 (on a 5-level scale). Source: Japan Meteorological Agency (JMA)
Dukono (Indonesia) | 28 October-3 November 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 28 October-3 November ash plumes from Dukono rose to 2.1 km (7,000 ft) a.s.l. and drifted in multiple directions. 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) | 28 October-3 November 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 22-23, 25-26, and 28-29 October that sent ash plumes up to 3.1 km (10,200 ft) a.s.l. and drifted W, NW, NE, 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)
Fuego (Guatemala) | 28 October-3 November 2020 | Continuing Eruptive Activity Cite this Report
Fuego Central America Volcanic Arc	INSIVUMEH reported that 2-14 explosions were recorded per hour during 27 October-3 November at Fuego, generating ash plumes as high as 1.1 km above the crater rim that drifted 10-25 km generally S, SW, and W. Shock waves rattled buildings within 12 km of the summit. Incandescent material ejected 100-300 m high caused block avalanches in the Ceniza (SSW), Seca (W), Trinidad (S), Taniluyá (SW), El Jute, Las Lajas (SE), and Honda drainages; avalanches sometimes reached vegetated areas. Ashfall was reported during 30 October-3 November in several areas downwind including Morelia (9 km SW), Panimaché I and II (8 km SW), Finca Palo Verde, La Rochela, Santa Sofía (12 km SW), Ceylon, El Zapote (10 km S), and Sangre de Cristo (8 km WSW). Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Katmai (United States) | 28 October-3 November 2020 | Continuing Eruptive Activity Cite this Report
Katmai Alaska Peninsula Volcanic Arc	On 31 October AVO reported that an ash cloud, resuspended by strong winds in the vicinity of Katmai and the Valley of Ten Thousand Smokes, drifted SE over the S part of Kodiak Island at an altitude up to 1.5 km (5,000 ft) a.s.l. The ash was originally deposited during the Novarupta eruption in 1912. The Volcano Alert Level remained at Normal and the Aviation Color Code remained at Green. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Pacaya (Guatemala) | 28 October-3 November 2020 | Continuing Eruptive Activity Cite this Report
Pacaya Central America Volcanic Arc	INSIVUMEH reported that Strombolian activity and lava effusion continued at Pacaya during 27 October-3 November. Explosions from the cone in Mackenney Crater ejected material as high as 250 m above the vent. Lava flows were 20 m and 1 km long on the NE and SW flanks, respectively. The lava flow on the NE flank was no longer active by 28 October, though parts of the SW-flank lava flow continued to advance through 3 November. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Santa María (Guatemala) | 28 October-3 November 2020 | Continuing Eruptive Activity Cite this Report
Santa María Central America Volcanic Arc	INSIVUMEH reported that during 27 October-3 November lava extrusion at Santa María's Santiaguito lava-dome complex generated block-and-ash flows that descended the W, SW, S, and SE flanks. Explosions generated ash plumes that rose as high as 900 m above the summit; ash plumes drifted 1 km SW during 27-28 and 30-31 October and as far as 10 km SW during 1-2 November. The lava dome was incandescent most nights. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Semeru (Indonesia) | 28 October-3 November 2020 | Continuing Eruptive Activity Cite this Report
Semeru Sunda Volcanic Arc	PVMBG that gray-and-white ash plumes from Semeru were recorded at 0521 on 29 October, at 0747 on 30 October, at 0509 on 1 November, and at 0519 on 2 November. The ash plumes rose 200-500 m above the summit and drifted S, SW, and N. 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) | 28 October-3 November 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 during 23-30 October. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Sinabung (Indonesia) | 28 October-3 November 2020 | Continuing Eruptive Activity Cite this Report
Sinabung Sunda Volcanic Arc	PVMBG reported that each day during 27 October-2 November avalanches descended Sinabung’s E and SE flanks as far as 1 km. Pyroclastic flows traveled 1-2.5 km down the same flanks almost daily. According to a news article, an eruption at 0752 on 29 October produced an ash plume that rose 1.5 km and caused ashfall in areas within 10 km downwind, particularly in Kabanjahe (13 km SE) and Berastagi (13 km E). An eruptive event at 2358 on 2 November generated an ash plume that rose 1.5 km and drifted E. 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 in the SE sector and 4 km in the NE sector. Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), The Jakarta Post
Suwanosejima (Japan) | 28 October-3 November 2020 | Continuing Eruptive Activity Cite this Report
Suwanosejima Ryukyu Volcanic Arc	JMA reported nighttime incandescence and intermittent eruptive activity at Suwanosejima’s Ontake Crater during 23-30 October. Eight explosions were recorded; an explosion at 0204 on 24 October ejected bombs 300 m from the crater and an explosion at 1710 on 28 October produced an ash plume that rose 2 km above the crater rim. Ashfall was periodically reported in Toshima village (4 km SSW). The Alert Level remained at 2 (on a 5-level scale). Source: Japan Meteorological Agency (JMA)
Telica (Nicaragua) | 28 October-3 November 2020 | Continuing Eruptive Activity Cite this Report
Telica Central America Volcanic Arc	INETER reported that a series of three explosions at Telica began at 1910 on 29 October and ended at 2137. The events ejected rock fragments onto the flanks and produced gas-and-ash plumes that rose as high as 1 km above the crater rim and drifted W. Ashfall was reported in areas downwind including the communities of El Bosque, Jacinto Baca (15 km WSW), Filiberto Morales (15 km WSW), Carlos Huete, Linda Vista, Divino Niño (31 km W). Three explosions produced gas-and-ash plumes that rose 250-600 m above the rim during 30-31 October. A minor amount of ash fell on the flanks. Source: Instituto Nicaragüense de Estudios Territoriales (INETER)

Since the Weekly Volcanic Activity Report began in November 2000, there have been 22,859 individual reports over 1,335 weeks (average of 17 per week) on 351 different volcanoes.

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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

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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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