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 10 January-16 January 2024
Name	Country	Volcanic Province	Eruption Start Date	Report Status
Ahyi	United States	Mariana Volcanic Arc	—	New
Ambrym	Vanuatu	Vanuatu Volcanic Arc	—	New
Grimsvotn	Iceland	Iceland Neovolcanic Rift Volcanic Province	—	New
Lewotobi	Indonesia	Sunda Volcanic Arc	2023 Dec 23	New
Marapi	Indonesia	Sunda Volcanic Arc	2023 Dec 3	New
Reykjanes	Iceland	Iceland Neovolcanic Rift Volcanic Province	—	New
Aira	Japan	Ryukyu Volcanic Arc	2017 Mar 25	Continuing
Bulusan	Philippines	Eastern Philippine Volcanic Arc	—	Continuing
Dukono	Indonesia	Halmahera Volcanic Arc	1933 Aug 13	Continuing
Ebeko	Russia	Kuril Volcanic Arc	2022 Jun 11	Continuing
Great Sitkin	United States	Aleutian Ridge Volcanic Arc	2021 May 25	Continuing
Lewotolok	Indonesia	Sunda Volcanic Arc	—	Continuing
Merapi	Indonesia	Sunda Volcanic Arc	2020 Dec 31	Continuing
Poas	Costa Rica	Central America Volcanic Arc	—	Continuing
Popocatepetl	Mexico	Trans-Mexican Volcanic Belt	2005 Jan 9	Continuing
Rincon de la Vieja	Costa Rica	Central America Volcanic Arc	2021 Jun 28	Continuing
Sangay	Ecuador	Northern Andean Volcanic Arc	2019 Mar 26	Continuing
Semeru	Indonesia	Sunda Volcanic Arc	2017 Jun 6	Continuing
Sheveluch	Russia	Eastern Kamchatka Volcanic Arc	1999 Aug 15	Continuing
Suwanosejima	Japan	Ryukyu Volcanic Arc	2004 Oct 23	Continuing

All times are local unless otherwise stated.

Ahyi (United States) | 10 January-16 January 2024 | New Activity / Unrest Cite this Report

Ahyi
Mariana Volcanic Arc

Signs of unrest at Ahyi Seamount were observed during the previous few weeks. Plumes of discolored water drifting as far as 10 km from the vent were identified in satellite data on 24 December 2023 and again on 4 and 10 January 2024. Hydroacoustic arrays located on Wake Island did not record any significant signals, though submarine plumes have been observed in the past without clear hydroacoustic evidence. The Aviation Color Code was raised to Yellow (the second level on a four-color scale) and the Volcano Alert Level was raised to Advisory (the second level on a four-level scale) on 14 January because the likelihood of an eruption had increased. No unusual activity observed in satellite data during 15-17 January.

Source: US Geological Survey

Ambrym (Vanuatu) | 10 January-16 January 2024 | New Activity / Unrest Cite this Report

Ambrym
Vanuatu Volcanic Arc

The Vanuatu Meteorology and Geo-Hazards Department (VMGD) reported that at 2217 on 13 January an eruption began at Ambrym’s Benbow Crater based on webcam and seismic data. The eruption was characterized by a loud explosion, intense incandescence at the crater, and gas-and-steam emissions. The Alert Level was raised from 1 to 3 (on a scale of 0-5) and the public to stay 2 km away from Benbow Crater and 4 km away from Marum Crater, and additionally to stay 500 m away from the ground cracks created by the December 2018 eruption. Sulfur dioxide emissions measured using satellite data were 1,116 tons per day on 14 January. Activity decreased during 15-17 January based on webcam images, seismic data, and field observations. Gas, steam, and ash emissions had decreased, and crater incandescence was dim or not visible at all. The Alert Level was lowered to 2 on 17 January.

Source: Vanuatu Meteorology and Geohazards Department (VMGD)

Grimsvotn (Iceland) | 10 January-16 January 2024 | New Activity / Unrest Cite this Report

Grimsvotn
Iceland Neovolcanic Rift Volcanic Province

IMO reported that at 0653 on 11 January a M 4.3 earthquake occurred at Grímsvötn and was the largest earthquake recorded at the volcano since measurements started in 1991. A gradual increase in tremor was recorded at Mt. Grímsfjall, which rises about 300 m above the flat ice shelf over the subglacial lake, since 7 January and the water level in the Gígjukvísl River began to rise on 10 January. IMO noted that a jökulhlaup had likely begun and that the earthquake was in response to pressure release from the flood. The Aviation Color Code was raised to Yellow (the second level on a four-color scale) reflecting the slight increase in the likelihood of an eruption being triggered by the flood. IMO noted that the last eruption was in 2004; since then, 12 jökulhlaups had occurred with no eruptions.

Water levels in the Gígjukvísl River steadily and significantly increased during 11-12 January and the river widened; the river rose 70 cm based on data from a stream gauge at the bridge crossing Highway 1. The water level stabilized during 13-14 January, signifying that it had reached peak flow, and was then expected to subside. Around midnight on 15 January the seismometer at Grímsfjall began recording increased tremor, which was likely due to increased geothermal activity and is commonly observed at the end of a jökulhlaup.

Source: Icelandic Meteorological Office (IMO)

Lewotobi (Indonesia) | 10 January-16 January 2024 | New Activity / Unrest Cite this Report

Lewotobi
Sunda Volcanic Arc

PVMBG reported that the eruption at Lewotobi’s Laki-laki volcano was ongoing during 10-16 January. Dense white-and-gray or white, gray, and brown ash plumes rose as high as 2 km above the summit and drifted N and NE. Lava flows from the summit crater continued to advance down the N flank and were about 2 km long by 11 January. Rumbling was reported on 13 January. On 14 January as many as four pyroclastic flows traveled up to 1 km down the NE, N, and NNW flanks and lava avalanches traveled 1.5-2 km down the NE flank, according to news articles. Incandescent avalanches of material and accompanying pyroclastic flows traveled as far as 1.5 km N on 15 January. Incandescent avalanches also traveled 2-3 km NE and 1 km NNE. The exclusion zone was increased to 5 km from the Laki-laki Crater and 6 km from the crater on the N and NE flanks during the evening of 16 January. The Alert Level remained at 4 (the highest level on a scale of 1-4).

Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Antara News, Antara News, Antara News, Antara News, Antara News

Marapi (Indonesia) | 10 January-16 January 2024 | New Activity / Unrest Cite this Report

Marapi
Sunda Volcanic Arc

PVMBG reported that eruptive activity at Marapi (on Sumatra) was ongoing at Verbeek Crater during 10-16 January. Dense, white-and-gray ash plumes rose as high as 1.5 km above the summit and drifted NW, W, and SW during 11-15 January. Weather conditions sometimes prevented views of the volcano. The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay 4.5 km away from Verbeek Crater.

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

Reykjanes (Iceland) | 10 January-16 January 2024 | New Activity / Unrest Cite this Report

Reykjanes
Iceland Neovolcanic Rift Volcanic Province

IMO reported that a seismic swarm began near the older Sundhnúkagígar crater row on the Reykjanes peninsula around 0230 on 14 January. Both GPS data and borehole pressure readings indicated that magma was moving. IMO raised the Aviation Color Code to Orange (the third level on a four-color scale), noting an increased likelihood of an eruption. The locations of the earthquakes shifted towards the town of Grindavík where, according to Almannavarnadeild ríkislögreglustjóra (National Commissioner of the Icelandic Police and Department of Civil Protection and Emergency Management), evacuations started around 0300.

A fissure eruption began at around 0757 just N of Grindavík, SE of Hagafell, and was visible on webcams. The Aviation Color Code was raised to Red, but then lowered back to Orange at 0826 because no ash was detected in radar data. A Coast Guard helicopter was dispatched to investigate the eruption site. A NE-SW-trending fissure was visible and notably lengthened within about 10 minutes according to a news article. The fissure grew to about 900 m long and crossed through the eastern part of a curving E-W-oriented earthen berm built to deflect lava flows away from the town. Lava fountaining occurred along the length of the fissure. Lava spread perpendicular from the fissure and to the SW, covering the E half of the berm, though the longest flow traveled WSW along the berm and away from the town. Construction workers managed to reach their heavy equipment that was being used to build the berm and drive them to safety away from the lava flows. Lava covered part of Grindavíkurvegur road and overtopped a small area of the berm at the road, flowing S.

A shorter second fissure that was about 100 m long opened at 1210 on 14 January to the SW of the first and S of the berm, about 200 m from the Efrahópi neighborhood in Grindavík. Lava flows traveled S, entering the town and setting at least three houses on fire. This fissure was no longer active by 1640 on 15 January and the effusion rate at the larger, main fissure had decreased. Seismicity and the rate of deformation had also decreased, though deformation near the S part of the magmatic dike near Grindavík continued to be detected. Displacement within the town was as high as 1.4 m during 14-15 January; ground cracks had developed, and existing ones had expanded. Thermal images from a 15 January drone flight indicated that previously mapped fissures SW of Grindavík had significantly enlarged. Lava effusion at the longer fissure was concentrated at two of four main vents. Lava effusion at the main fissure ceased around 0100 on 16 January. Seismicity continued to decrease, though event locations indicated that magma movement continued. Most of the seismic activity was concentrated near Hagafell, close to the main fissure. IMO lowered the Aviation Color Code to Yellow at 2105, noting the ongoing decline of seismicity.

A man working on filling cracks in Grindavík fell into one of the cracks on 10 January and was unable to be located. Hundreds of rescue workers searched for the man but due to unsafe conditions and landslides occurring inside the crack the search was stopped on 12 January.

Sources: Icelandic Meteorological Office (IMO), Almannavarnadeild ríkislögreglustjóra (National Commissioner of the Icelandic Police and Department of Civil Protection and Emergency Management), Icelandic National Broadcasting Service (RUV), Independent

Aira (Japan) | 10 January-16 January 2024 | Continuing ActivityCite this Report

Aira
Ryukyu Volcanic Arc

JMA reported ongoing eruptive activity at Minamidake Crater (Aira Caldera’s Sakurajima volcano) during 8-15 January with incandescence at the crater observed nightly. An explosion at 1552 on 9 January produced an ash plume that rose as high as 1.2 km above the crater rim and drifted E and SE. Small eruptive events were occasionally recorded during 12-15 January. The Alert Level remained at 3 (on a 5-level scale), and the public was warned to stay 2 km away from both craters.

Source: Japan Meteorological Agency (JMA)

Bulusan (Philippines) | 10 January-16 January 2024 | Continuing ActivityCite this Report

Bulusan
Eastern Philippine Volcanic Arc

PHIVOLCS reported increased seismicity at Bulusan in a special advisory. From 0500 on 11 January to 1000 on 11 January the seismic network recorded a total of 71 volcanic-tectonic earthquakes associated with rock fracturing. The earthquakes were located at depths of 1-6 km beneath the S flank. The largest event was a M 2.2. Diffuse gas plumes rose from the summit crater and drifted W and SE. The Alert Level remained at 1 (the second level on a scale of 0-5) and PHIVOLCS reminded the public not to enter the 4-km-radius Permanent Danger Zone (PDZ) and to be vigilant within the 2-km Extended Danger Zone (EDZ) on the SE flank.

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)

Dukono (Indonesia) | 10 January-16 January 2024 | Continuing ActivityCite this Report

Dukono
Halmahera Volcanic Arc

PVMBG reported that the eruption at Dukono was ongoing during 10-16 January. Gray-and-white ash plumes generally rose 100-700 m above the summit and drifted S during 10-15 January; emissions were not observed on 11 January. White-and-gray ash plumes rose to 1.7 km above the summit and drifted SW on 16 January. The Alert Level remained at Level 2 (on a scale of 1-4), and the public was warned to remain outside of the 2-km exclusion zone.

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

Ebeko (Russia) | 10 January-16 January 2024 | Continuing ActivityCite this Report

Ebeko
Kuril Volcanic Arc

KVERT reported that moderate explosive activity was ongoing at Ebeko during 4-11 January. According to volcanologists in Severo-Kurilsk (Paramushir Island, about 7 km E), explosions on 6, 8, and 9 January generated ash plumes that rose as high as 2.5 km (8,200 ft) a.s.l and drifted SE and NW. The Aviation Color Code remained at Orange (the third level on a four-color scale). Dates are UTC; specific events are in local time where noted.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Great Sitkin (United States) | 10 January-16 January 2024 | Continuing ActivityCite this Report

Great Sitkin
Aleutian Ridge Volcanic Arc

On 11 January AVO reported that a radar image of Great Sitkin showed that the thick flow in the summit crater continued to expand to the E and reached the N margin of an earlier flow; effusion likely continued during 12-16 January. Local webcams and seismic data communications were offline due to a storm-related power failure. No unusual activity was visible in mostly cloudy satellite images. Weakly elevated surface temperatures were identified in satellite data during 15-16 January. The Volcano Alert Level remained at Watch (the third level on a four-level scale) and the Aviation Color Code remained at Orange (the third color on a four-color scale).

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Lewotolok (Indonesia) | 10 January-16 January 2024 | Continuing ActivityCite this Report

Lewotolok
Sunda Volcanic Arc

PVMBG reported that the eruption at Lewotolok continued during 10-16 January. White-and-gray ash plumes rose 150 m above the summit and drifted E on 12 January. White steam-and-gas plumes rose as high as 200 m above the summit and drifted NE, E, and SE on the other days, though no emissions were visible on 12 January. Incandescent lava was occasionally ejected about the vent. The Alert Level remained at 2 (on a scale of 1-4) and the public was warned to stay at least 2 km away from the summit crater.

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

Merapi (Indonesia) | 10 January-16 January 2024 | Continuing ActivityCite this Report

Merapi
Sunda Volcanic Arc

BPPTKG reported that the eruption at Merapi (on Java) continued during 5-11 January. The SW lava dome produced a total of 189 lava avalanches that descended the S, SW, and W flanks; eight traveled S as far as 1.5 km down the upper part of the Boyong drainage, 178 traveled SW as far as 1.8 km down the upper part of the Bebeng drainage, and three traveled as far as 1.5 km down the Sat/Putih drainage. Four pyroclastic flows descended the Boyong and Bebeng drainages as far as 1.5 km. Morphological changes to the SW lava dome identified in webcam images were due to continuing collapses of material. The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay 3-7 km away from the summit, based on location.

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

Poas (Costa Rica) | 10 January-16 January 2024 | Continuing ActivityCite this Report

Poas
Central America Volcanic Arc

OVSICORI-UNA reported that small phreatic eruptions at Poás continued to be observed during 8-16 January. Phreatic eruptions were recorded daily, ejecting sediment no more than 200 m above the lake’s surface and producing steam-and-gas plumes that rose no higher than 500 m. In a special report OVSICORI-UNA noted that both gas-and-steam emissions and seismicity began to increase during the second half of 2023. The lake level had been decreasing since October 2023 and eruptive events became more frequent and energetic in December; a phreatic eruption at 2051 on 11 January was the largest event recorded during December 2023-January 2024.

Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)

Popocatepetl (Mexico) | 10 January-16 January 2024 | Continuing ActivityCite this Report

Popocatepetl
Trans-Mexican Volcanic Belt

CENAPRED reported that eruptive activity continued at Popocatépetl during 9-16 January. Long-period events totaling 6-64 per day were accompanied by steam-and-gas plumes that occasionally contained minor amounts of ash. The plumes mainly drifted ENE and NE. The seismic network recorded 14.5-23 daily hours of tremor, including both low- and high-frequency events. Minor amounts of ash fell in Nealtican (21 km E) during 11-12 January. Ashfall was also reported in Nativitas (40 km NE), Tetlatlahuaca (42 km NE), Zacatelco (45 km NE), Xicohtinco (45 km NE), Ayometla (46 km ENE), Papalotla (62 km NNW), Tenancingo, San Pablo del Monte (49 km E), Mazatecochco (50 km ENE), Tlaxcala (50 km NW), and Tepeyanco (47 km NW) in the state of Tlaxcala on 15 January and in Nealtican, Juan C. Bonilla (32 km ENE), and Tlaltenango in the state of Puebla on 16 January. The Alert Level remained at Yellow, Phase Two (the middle level on a three-color scale) and the public was warned to stay 12 km away from the crater.

Source: Centro Nacional de Prevencion de Desastres (CENAPRED)

Rincon de la Vieja (Costa Rica) | 10 January-16 January 2024 | Continuing ActivityCite this Report

Rincon de la Vieja
Central America Volcanic Arc

OVSICORI-UNA reported continued unrest at Rincón de la Vieja during 8-16 January. Small phreatic eruptions were recorded almost daily, sometimes producing gas-and-steam plumes that rose as high as 3 km above the crater rim. Almost continuous gas-and-steam emissions were visible during 10-11 January. The Alert Level remained at Level 3, Orange, the third level on a four-level scale.

Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)

Sangay (Ecuador) | 10 January-16 January 2024 | Continuing ActivityCite this Report

Sangay
Northern Andean Volcanic Arc

IG-EPN reported a high level of eruptive activity at Sangay during 9-16 January, with seismic stations recording 232-626 daily explosions. Ash-and-gas plumes were visible in both webcam and satellite images during 9-14 January, rising as high as 1.5 km above the crater rim and drifting W, WSW, and SW. On 12 January an explosion deposited incandescent material on all flanks as far as 1 km from the summit crater. At 1810 that same day a pyroclastic density current descended the SE drainage and an ash plume rose 1 km above the summit and drifted SW. Crater incandescence was sometimes visible at night, and during 11-12 and 13-14 January incandescent material was observed descending the SE drainage as far as 1 km. Cloudy weather prevented views during 15-16 January, though crater incandescence was observed overnight. Secretaría de Gestión de Riesgos maintained the Alert Level at Yellow (the second highest level on a four-color scale).

Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN), Secretaría de Gestión de Riesgos (SGR)

Semeru (Indonesia) | 10 January-16 January 2024 | Continuing ActivityCite this Report

Semeru
Sunda Volcanic Arc

PVMBG reported that eruptive activity continued at Semeru during 10-16 January. Daily white-and-gray ash plumes that were sometimes dense rose 500-1,000 m above the summit and drifted in multiple directions. The Alert Level remained at 3 (third highest on a scale of 1-4). The public was warned to stay at least 5 km away from the summit in all directions, 13 km from the summit to the SE, 500 m from the banks of the Kobokan drainage as far as 17 km from the summit, and to avoid other drainages including the Bang, Kembar, and Sat, due to lahar, avalanche, and pyroclastic flow hazards.

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

Sheveluch (Russia) | 10 January-16 January 2024 | Continuing ActivityCite this Report

Sheveluch
Eastern Kamchatka Volcanic Arc

KVERT reported that the eruption at Sheveluch continued during 4-11 January with a daily thermal anomaly identified in satellite images. The Aviation Color Code remained at Orange (the third level on a four-color scale). Dates are based on UTC times; specific events are in local time where noted.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Suwanosejima (Japan) | 10 January-16 January 2024 | Continuing ActivityCite this Report

Suwanosejima
Ryukyu Volcanic Arc

JMA reported that the eruption at Suwanosejima's Ontake Crater continued during 8-15 January. Eruptive events on 11 January produced ash plumes that rose as high as 1.1 km above the crater rim and drifted SE. An explosion at 0548 on 13 January produced an ash plume that rose 800 m and drifted SE. At 0022 on 14 January an explosion ejected large blocks 1.1 km to the N and 1 km to the S of the vent and produced an ash plume that rose 500 m above the crater rim. The Alert Level was raised to 3 (on a 5-level scale) and the public was warned to stay 2 km away from the crater. Another eruptive event at 2313 on 15 January generated an ash plume that rose more than 1 km above the crater rim and drifted S.

Source: Japan Meteorological Agency (JMA)

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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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