Smithsonian / USGS Weekly Volcanic Activity Report

The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program. Updated by 2300 UTC every Wednesday and averaging 16 reported volcanoes, this is not a comprehensive list of all eruptions this week, but rather a summary of activity that meet criteria discussed in the "Criteria and Disclaimers" section below.

Volcanic activity reported here is preliminary and subject to change. Carefully reviewed, detailed narratives over longer time periods are published as reports of the Bulletin of the Global Volcanism Network available through volcano profile pages.

Smithsonian / USGS Weekly Volcanic Activity Report for the week of 13 January-19 January 2021
Name	Country	Volcanic Province	Eruption Start Date	Report Status
Kilauea	United States	Hawaiian-Emperor Hotspot Volcano Group	—	New
Langila	Papua New Guinea	Bismarck Volcanic Arc	2015 Oct 22 (?)	New
Merapi	Indonesia	Sunda Volcanic Arc	2020 Dec 31	New
Pelee	France	Lesser Antilles Volcanic Arc	—	New
Sarychev Peak	Russia	Kuril Volcanic Arc	—	New
Soufriere St. Vincent	Saint Vincent and the Grenadines	Lesser Antilles Volcanic Arc	—	New
Suwanosejima	Japan	Ryukyu Volcanic Arc	2004 Oct 23	New
Aira	Japan	Ryukyu Volcanic Arc	2017 Mar 25	Continuing
Dukono	Indonesia	Halmahera Volcanic Arc	1933 Aug 13	Continuing
Ebeko	Russia	Kuril Volcanic Arc	2022 Jun 11	Continuing
Etna	Italy	Sicily Volcanic Province	—	Continuing
Karymsky	Russia	Eastern Kamchatka Volcanic Arc	—	Continuing
Klyuchevskoy	Russia	Eastern Kamchatka Volcanic Arc	—	Continuing
Lewotolok	Indonesia	Sunda Volcanic Arc	2020 Nov 27	Continuing
Ruapehu	New Zealand	Taupo Volcanic Zone	—	Continuing
Sabancaya	Peru	Andean Central Volcanic Arc	2016 Nov 6	Continuing
Semeru	Indonesia	Sunda Volcanic Arc	2017 Jun 6	Continuing
Sheveluch	Russia	Eastern Kamchatka Volcanic Arc	1999 Aug 15	Continuing
Shishaldin	United States	Aleutian Ridge Volcanic Arc	—	Continuing
Sinabung	Indonesia	Sunda Volcanic Arc	—	Continuing
Veniaminof	United States	Aleutian Ridge Volcanic Arc	—	Continuing
Yasur	Vanuatu	Vanuatu Volcanic Arc	1270 ± 110 years	Continuing

All times are local unless otherwise stated.

Kilauea (United States) | 13 January-19 January 2021 | New Activity / Unrest Cite this Report

Kilauea
Hawaiian-Emperor Hotspot Volcano Group

HVO reported that low lava fountains from a vent on a cone on the inner NW wall of Kilauea’s Halema`uma`u Crater fed flows that traveled down a channel into a perched lava lake during 13-19 January. The western half of the lake deepened from 198 m to 202 m while the stagnant eastern half remained a few meters lower. The lake was perched 1-2 m above the rim. On 13 January a small portion of the cone collapsed, causing a second vent to open adjacent to the main vent and effuse lava for less than 20 minutes. The islands remained stationary in the E part of the lake; the dimensions of the largest island remained unchanged. The sulfur dioxide emission rate was 4,700 tons/day on 14 January.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Langila (Papua New Guinea) | 13 January-19 January 2021 | New Activity / Unrest Cite this Report

Langila
Bismarck Volcanic Arc

Based on analyses of satellite imagery and wind model data, the Darwin VAAC reported that on 13 January an ash plume from Langila rose to 3 km (10,000 ft) a.s.l. and drifted WSW.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Merapi (Indonesia) | 13 January-19 January 2021 | New Activity / Unrest Cite this Report

Merapi
Sunda Volcanic Arc

BPPTKG reported that the “2021 lava dome” continued to emerge just below Merapi’s SW rim during 8-14 January, producing a total of 128 incandescent lava avalanches that traveled as far as 900 m down the Krasak River drainage on the SW flank. A comparison of photos taken on 7 and 14 January showed that the morphological changes in the summit area were attributed to the emergence of new lava domes. The 2021 dome volume was an estimated 46,766 cubic meters on 14 January, with a growth rate of about 8,500 cubic meters per day. Deformation continued, though at a lower rate; Electronic Distance Measurement (EDM) data showed a distance shortening between points in the NW at a rate of 6 cm per day. Seismic activity significantly decreased compared to the previous week.

At around 0400 on 16 January a pyroclastic flow descended 1.5 km down the Krasak drainage and produced an ash plume that rose 500 m. A pyroclastic flow was visible in webcam images around 1700 on 16 January, though somewhat obscured due to weather clouds, and traveled an estimated 1 km. From 1800 on 16 January to 0600 on 17 January there were a total of 56 incandescent lava avalanches that went a maximum distance of 1.5 km SW. During the first six hours of 18 January six incandescent avalanches descended 600 m SW. At 0543 a pyroclastic flow traveled about 1 km down the Krasak drainage and produced an ash plume that rose 50 m above the summit and drifted SE. The Alert Level remained at 3 (on a scale of 1-4), and the public were warned to stay 5 km away from the summit.

Source: Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG)

Pelee (France) | 13 January-19 January 2021 | New Activity / Unrest Cite this Report

Pelee
Lesser Antilles Volcanic Arc

L'Observatoire Volcanologique et Sismologique de Martinique (OVSM) reported that seismicity at Pelée remained at significant levels during 8-15 January, though had slightly decreased compared to the previous week. The seismic network recorded at least 22 high-frequency, volcano-tectonic earthquakes with magnitudes less than 1, located at shallow depths between 600 and 1,000 m above sea level. Two low-frequency, long-period earthquakes were also noted. The Alert Level remained at Yellow (the second lowest level on a four-color scale).

Source: L'Observatoire Volcanologique et Sismologique de Martinique (OVSM)

Sarychev Peak (Russia) | 13 January-19 January 2021 | New Activity / Unrest Cite this Report

Sarychev Peak
Kuril Volcanic Arc

KVERT reported that a thermal anomaly over Sarychev Peak was identified during 7-10 and 12-13 January. A gas-and-steam plume drifted 40 km NE on 12 January. The Aviation Color Code was raised to Yellow (the second lowest level on a four-color scale) on 10 January.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Soufriere St. Vincent (Saint Vincent and the Grenadines) | 13 January-19 January 2021 | New Activity / Unrest Cite this Report

Soufriere St. Vincent
Lesser Antilles Volcanic Arc

University of the West Indies Seismic Research Centre (UWI-SRC) and National Emergency Management Organisation (NEMO) reported that the lava dome in Soufrière St. Vincent’s main crater continued to grow during 13-19 January.

Observations on 14 January revealed that the dome was growing taller as well as expanding to the E and W. During an overflight on 15 January scientists saw extensive vegetation damage on the E, S, and W inner crater walls; damage previously noted along the upper part of the SW crater rim had expanded downslope. The dome dimensions were estimated to be 340 m long, 160 m wide, and 90 m high.

Scientists visited the dome on 16 January and collected rock samples from the W part of the dome. They recorded temperatures around 590 degrees Celsius from the expanding dome front. Gas emissions were most notable from a small circular depression at the top of the dome. At night during 15-17 January residents to the W saw incandescence emanating from the crater, a phenomenon likely to be more frequent as the dome grows higher. Gas emissions were visible in the afternoon of 17 January rising from the top of the dome as well as from areas of contact between the new and old domes. An area of burnt vegetation extended from the dome along the W part of the crater floor.

By the end of the week both new seismic and continuous GPS monitoring stations had been installed and were transmitting data, bring the total number of dedicated seismic stations to five. The Alert Level remained at Orange (the second highest level on a four-color scale).

Sources: University of the West Indies Seismic Research Centre (UWI-SRC), National Emergency Management Organisation (NEMO), Government of Saint Vincent and the Grenadines

Suwanosejima (Japan) | 13 January-19 January 2021 | New Activity / Unrest Cite this Report

Suwanosejima
Ryukyu Volcanic Arc

JMA reported that incandescence at Suwanosejima’s Ontake Crater was visible nightly during 11-15 January. Intermittent explosions produced ash plumes that rose as high as 1.4 km above the crater rim and ejected bombs 400 m away from the crater. The Alert Level was lowered to 2 (on a 5-level scale) on 14 January; JMA noted that no large bombs were ejected more than 1 km from the crater beginning on 29 December 2020.

Source: Japan Meteorological Agency (JMA)

Aira (Japan) | 13 January-19 January 2021 | Continuing ActivityCite this Report

Aira
Ryukyu Volcanic Arc

JMA reported that during 11-18 January incandescence from Minamidake Crater (at Aira Caldera’s Sakurajima volcano) was often visible nightly. The sulfur dioxide emission rate remained high, reaching 2,100 tons per day on 13 January. Five explosions and three eruptive events were recorded, producing eruption plumes that rose 1.3-2 km above the crater rim and ejecting bombs 500-900 m away from the crater. The Alert Level remained at 3 (on a 5-level scale).

Source: Japan Meteorological Agency (JMA)

Dukono (Indonesia) | 13 January-19 January 2021 | Continuing ActivityCite this Report

Dukono
Halmahera Volcanic Arc

Based on satellite and wind model data, the Darwin VAAC reported that during 13-14 January ash plumes from Dukono rose to 2.1 km (7,000 ft) a.s.l. and drifted E and WSW. 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) | 13 January-19 January 2021 | Continuing ActivityCite this Report

Ebeko
Kuril Volcanic Arc

Volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, observed explosions during 7-10 and 13-14 January; ash plumes rose up to 4.5 km (14,800 ft) a.s.l. and drifted E. 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) | 13 January-19 January 2021 | Continuing ActivityCite this Report

Etna
Sicily Volcanic Province

INGV reported that during 11-17 January activity at Etna was characterized by intra-crater Strombolian activity at Northeast Crater (NEC), occasional ash emissions from the Voragine (VOR) and Bocca Nuova (BN) craters, and Strombolian activity, lava effusion, and ash emissions at the Southeast Crater (SEC). In general, the activity was similar to the pervious week, though activity at SEC on 18 January was notable.

Lava effusion began around 0700 on 17 January but was confined to the SEC summit cone. At around 0740 the lava breached the crater and lava flowed down to the base of the cone. The effusion rate increased by 0819 and an ash emission was possibly visible; the lava flow lengthened and had reached an elevation of 3,000 m by 1000. Weather clouds moved in and prevented visual observations until 1830 on 18 January when the lava flow was visible again; it was no longer being fed and was cooling. Volcanic tremor amplitude increased and Strombolian activity intensified at 2000. A new lava flow emerged at 2015 and traveled towards the Valle del Bove, reaching an elevation of 2,900 m. Low lava fountains were visible at 2130 and an ash plume drifted ESE, causing ashfall on the downwind flank. Lava flows descended the SE, E, and NE flanks of the SEC. Explosive activity significantly decreased at 2200. Two distinct lava flows were visible, with one heading N and the other moving towards the Valle del Bove. Tremor and infrasound signals decreased to pre-episode levels by 2230. The the lava flows were stable and cooling on 19 January.

Source: Sezione di Catania - Osservatorio Etneo (INGV)

Karymsky (Russia) | 13 January-19 January 2021 | Continuing ActivityCite this Report

Karymsky
Eastern Kamchatka Volcanic Arc

KVERT reported that a thermal anomaly over Karymsky was visible in satellite images during 8-15 January. 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) | 13 January-19 January 2021 | Continuing ActivityCite this Report

Klyuchevskoy
Eastern Kamchatka Volcanic Arc

KVERT reported that Strombolian and sometimes Vulcanian activity at Klyuchevskoy continued during 8-15 January and lava advanced down the Kozyrevsky drainage on the S flank. A large bright thermal anomaly was identified daily in satellite images. Steam-and-gas plumes with some ash rose to 6 km (19,700 ft) a.s.l. and drifted 90 km in multiple directions. The Aviation Color Code remined at Orange (the second highest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Lewotolok (Indonesia) | 13 January-19 January 2021 | Continuing ActivityCite this Report

Lewotolok
Sunda Volcanic Arc

PVMBG reported that a Strombolian eruption at Lewotolo continued during 13-19 January. Gray-and-white ash plumes rose 200-700 m above the summit daily and rumbling sounds were reported. Strombolian explosions ejected material 100-500 m above the summit, and incandescent material was ejected as far as 1.5 km SE from the crater. The Alert Level remained at 3 (on a scale of 1-4) and the public was warned to stay 4 km away from the summit crater.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Ruapehu (New Zealand) | 13 January-19 January 2021 | Continuing ActivityCite this Report

Ruapehu
Taupo Volcanic Zone

GeoNet reported that volcanic tremor at Ruapehu declined to low levels on 29 December 2020, and remained low; volcanic gas emissions returned to background levels by the next day. Water chemistry had only slightly changed compared to data collected a few weeks prior. Although the temperature of the crater lake water remained high (40 degrees Celsius), the period of heightened unrest was over; the Volcanic Alert Level was lowered to 1 and the Aviation Color Code was lowered to Green on 11 January.

Source: GeoNet

Sabancaya (Peru) | 13 January-19 January 2021 | Continuing ActivityCite this Report

Sabancaya
Andean Central Volcanic Arc

Instituto Geofísico del Perú (IGP) reported a daily average of 29 explosions at Sabancaya during 11-17 January. Gas-and-ash plumes rose as high as 3 km above the summit and drifted in multiple directions. One thermal anomaly over the crater was identified in satellite data. Minor inflation continued to be detected in areas N of Hualca Hualca (4 km N) and on the SE flank. The Alert Level remained at Orange (the second highest level on a four-color scale) and the public were warned to stay outside of a 12-km radius.

Source: Instituto Geofísico del Perú (IGP)

Semeru (Indonesia) | 13 January-19 January 2021 | Continuing ActivityCite this Report

Semeru
Sunda Volcanic Arc

PVMBG reported that during 1-15 January incandescent avalanches of material from the Jonggring Seleko Crater at Semeru sometimes traveled 500-1,000 m down the Kobokan drainage on the SE flank. Incandescent material was ejected 10-30 m above the summit and white-and-gray plumes rose 200-300 m and drifted N. Weather conditions often prevented visual observations. A pyroclastic flow was detected at 1451 on 1 January, though weather clouds prevented visual confirmation. At 1724 on 16 January incandescent avalanches traveled as far as 1 km down the Kobokan drainage and a pyroclastic flow traveled about 4-4.5 km down the same drainage. A large ash cloud rose along the length of the pyroclastic flow to 2 km above the summit and drifted NE and N. Ashfall was reported in areas to the N. During 18-19 January dense gray-white plumes rose 300-500 m above the summit and drifted N. Rumbling was heard and incandescent material was ejected 30 m high. The Alert Level remained at 2 (on a scale of 1-4), with a general exclusion zone of 1 km and extensions to 4 km in the SSE sector.

Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Badan Nacional Penanggulangan Bencana (BNPB), The Jakarta Post

Sheveluch (Russia) | 13 January-19 January 2021 | Continuing ActivityCite this Report

Sheveluch
Eastern Kamchatka Volcanic Arc

KVERT reported that a thermal anomaly over Sheveluch was identified in satellite images during 8-15 January. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Shishaldin (United States) | 13 January-19 January 2021 | Continuing ActivityCite this Report

Shishaldin
Aleutian Ridge Volcanic Arc

AVO reported that several outages affected GPS, seismic, and infrasound stations used to monitor Shishaldin. On 15 January AVO changed both the Aviation Color Code and the Volcano Alert Level to Unassigned, reflecting the lack of this data to detect unrest. The volcano continued to be monitored with local webcams, satellite data, and remote infrasound, seismic, and lightning networks.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Sinabung (Indonesia) | 13 January-19 January 2021 | Continuing ActivityCite this Report

Sinabung
Sunda Volcanic Arc

PVMBG reported that the eruption at Sinabung continued during 13-19 January, though weather conditions often prevented visual conformation. White-and-gray ash plumes rose as high as 500 m above the summit during 14-15 January, and avalanches of material traveled 700-1,000 m down the SE flank. Dense white-and-gray ash plumes rose 500 m during 17-18 January. 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), Darwin Volcanic Ash Advisory Centre (VAAC)

Veniaminof (United States) | 13 January-19 January 2021 | Continuing ActivityCite this Report

Veniaminof
Aleutian Ridge Volcanic Arc

AVO reported that seismic data for Veniaminof had not been received since 8 December 2020 due to a problem with the satellite link at Port Heiden. Both the Aviation Color Code and the Volcano Alert Level were changed to Unassigned on 15 January, reflecting the lack of available seismic data to detect unrest.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Yasur (Vanuatu) | 13 January-19 January 2021 | Continuing ActivityCite this Report

Yasur
Vanuatu Volcanic Arc

Vanuatu Meteorology and Geo-Hazards Department (VMGD) reported that an ash-and-gas emission rose above Yasur’s crater rim at 1734 on 18 January. The Alert Level remained at 2 (on a scale of 0-4). VMGD reminded residents and tourists that hazardous areas were near and around the volcanic crater, and that volcanic ash and gas could reach areas impacted by trade winds.

Source: Vanuatu Meteorology and Geohazards Department (VMGD)

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Criteria & Disclaimers

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 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.

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. 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.

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