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 5 March-11 March 2025
Name	Country	Volcanic Region	Eruption Start Date	Report Status
Bezymianny	Russia	Eastern Kamchatka Volcanic Arc	2024 Dec 24	New
Etna	Italy	Sicily Volcanic Province	2022 Nov 27	New
Fuego	Guatemala	Central America Volcanic Arc	2002 Jan 4	New
Langila	Papua New Guinea	Bismarck Volcanic Arc	2015 Oct 22 (?)	New
Poas	Costa Rica	Central America Volcanic Arc	2025 Jan 5	New
Turrialba	Costa Rica	Central America Volcanic Arc	—	New
Ahyi	United States	Mariana Volcanic Arc	2024 Aug 5	Continuing
Aira	Japan	Ryukyu Volcanic Arc	2017 Mar 25	Continuing
Dukono	Indonesia	Halmahera Volcanic Arc	1933 Aug 13	Continuing
Great Sitkin	United States	Aleutian Ridge Volcanic Arc	2021 May 25	Continuing
Home Reef	Tonga	Tofua Volcanic Arc	2024 Dec 4	Continuing
Ibu	Indonesia	Halmahera Volcanic Arc	2008 Apr 5	Continuing
Kanlaon	Philippines	Negros-Sulu Volcanic Arc	2024 Oct 19	Continuing
Kilauea	United States	Hawaiian-Emperor Hotspot Volcano Group	2024 Dec 23	Continuing
Lewotobi	Indonesia	Sunda Volcanic Arc	2023 Dec 23	Continuing
Lewotolok	Indonesia	Sunda Volcanic Arc	2025 Jan 16	Continuing
Marapi	Indonesia	Sunda Volcanic Arc	2023 Dec 3	Continuing
Merapi	Indonesia	Sunda Volcanic Arc	2020 Dec 31	Continuing
Nevado del Ruiz	Colombia	Northern Andean Volcanic Arc	2014 Nov 18	Continuing
Semeru	Indonesia	Sunda Volcanic Arc	2017 Jun 6	Continuing
Suwanosejima	Japan	Ryukyu Volcanic Arc	2004 Oct 23	Continuing

All times are local unless otherwise stated.

Bezymianny (Russia) | 5 March-11 March 2025 | New Activity / Unrest Cite this Report

Bezymianny
Eastern Kamchatka Volcanic Arc

The Kamchatkan Volcanic Eruption Response Team (KVERT) reported that a strong thermal anomaly over Bezymianny was identified in satellite images during 28 February-6 March. According to the Institute of Volcanology and Seismology (IVS) of the Far Eastern Branch of the Russian Academy of Sciences (FEB RAS), incandescent debris avalanches descended the SE flanks daily and summit incandescence was visible during dark hours. Ash plumes generated from debris avalanches rose as high as 2.2 km above the summit and drifted mainly E, NE, and NW. Weather conditions occasionally obscured webcam and satellite views. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Dates are reported in UTC; specific events are in local time where noted.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Institute of Volcanology and Seismology (IVS) of the Far Eastern Branch of the Russian Academy of Sciences (FEB RAS)

Etna (Italy) | 5 March-11 March 2025 | New Activity / Unrest Cite this Report

Etna
Sicily Volcanic Province

The Sezione di Catania - Osservatorio Etneo (INGV) reported that lava effusion at the fissure on the upper S flank of Etna’s Bocca Nuova Crater ceased on 2 March and began cooling. During 3-9 March gas emissions were observed rising from the summit craters, though weather clouds often obscured views. The Aviation Color Code was lowered to Yellow (the second lowest level on a four-color scale) at 1152 on 5 March and then to Green at 1839 that same day.

Source: Sezione di Catania - Osservatorio Etneo (INGV)

Fuego (Guatemala) | 5 March-11 March 2025 | New Activity / Unrest Cite this Report

Fuego
Central America Volcanic Arc

The Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología (INSIVUMEH) reported that elevated eruptive activity at Fuego was characterized by explosions and ash plumes, incandescent material ejected above the summit, incandescent avalanches, and pyroclastic flows. The stronger activity began at around 0255 on 9 March with explosions detected in seismic and acoustic data and increasing thermal radiance at the summit detected in satellite data. Explosions ejected incandescent material onto the upper flanks on all directions and caused avalanches of incandescent material. Explosions and gas ejections were heard in areas several kilometers away. According to the Washington VAAC significant ash plumes rose about 1.1 km above the summit at 0350, but by 0930 the plumes were more sporadic and diffuse; the plumes drifted W and NW. INSIVUMEH noted that activity intensified in the early evening and became continuous. The VAAC reported that at 1620 ash plumes rose around 500 m above the summit and drifted W. At around 1800 air quality monitoring stations in Guatemala City recorded decreased quality conditions due to ash in the air, according to CONRED. The VAAC reported that at 2200 dense ash emissions rose 500 m and drifted 150 km SW while a second plume rose 1.1 km above the summit and drifted NW.

Activity notably intensified again at 2100 on 9 March. Lava fountains rose 300 m above the summit, avalanches of incandescent blocks descended the flanks, and shockwaves from explosions rattled nearby houses and structures. Ash plumes rose 3.2 km above the summit and fanned out as far as 50 km SW, W, and NW. Continuous ashfall was reported in areas W and S. Just before 2330 pyroclastic flows descended the Seca (W) and Ceniza (SSW) drainages and about 25 minutes later pyroclastic flows descended the Las Lajas (SE) and El Jute (ESE) drainages. CONRED staff assisted 267 people from El Porvenir and 15 from Las Lajitas to an evacuation shelter in the Municipal Hall of San Juan Alotenango, Sacatepéquez. A section of the RN-14, the national route connecting Escuintla and Sacatepéquez, was temporarily closed as a preventative measure.

Overnight during 9-10 March lava fountains rose 500 m high. Dense ash-and-gas plumes rose 6 km above the summit and drifted 100-120 km NW and E. Low-altitude plumes with ash remobilized from earlier pyroclastic flows drifted SW. On 10 March the Ministry of Education suspended classes in the municipalities of Alotenango, Sacatepéquez; Escuintla and Siquinalá in the department of Escuintla; and in San Pedro Yepocapa, Chimaltenango. Activity began to decrease and by 1130 on 10 March explosions were no longer continuous. Ash-and-gas plumes rose 1.1 km above the summit and drifted 100 km NW and SW. Minor ashfall continued to impact areas to the W and SW; ash remained suspended in the air and ashfall on crops was up to 1 mm thick. By 1230 the air quality monitoring station in Guatemala City recorded improved quality conditions due to less ash in the air. Activity continued to decline. INSIVUMEH issued a report at 1800 noting that activity had returned to “baseline” levels; seismicity was at “normal” levels and satellite data indicated that large amounts of ash were no longer suspended in the air. Thermal anomalies were also no longer detected in satellite data. Overnight during 10-11 March a few incandescent blocks in the crater were visible along with minor avalanches of incandescent material. Diffuse gas emissions rose form the crater. During 11-12 March gas emissions rose about 100 m above the summit and no incandescent explosions were observed.

Sources: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH), Coordinadora Nacional para la Reducción de Desastres (CONRED)

Langila (Papua New Guinea) | 5 March-11 March 2025 | New Activity / Unrest Cite this Report

Langila
Bismarck Volcanic Arc

The Darwin VAAC reported that an ash plume from Langila was identified in a satellite image at 0700 on 6 March rising to 1.8 km (6,000 ft) a.s.l. and drifting SW. The ash had dissipated within two hours.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Poas (Costa Rica) | 5 March-11 March 2025 | New Activity / Unrest Cite this Report

Poas
Central America Volcanic Arc

The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported that eruptive activity at Poás intensified during 1-2 March and continued at a high level through 11 March. Frequent phreatic eruptions during 4-7 March ejected material as high as 50 m above the crater floor. The phreatic eruptions were almost continuous at Boca C and sporadic and Boca A. Radial deformation and inflation was detected in and around the crater, and the rate of deformation was increasing. The lake level had dropped, and the water was separated into two small ponds. An analysis of monitoring data suggested that there were disturbances of the magmatic system at depth which increased the probability of dangerous eruptions within the Parque Nacional Volcán Poás within the next few days or weeks. At 1330 on 7 March the Alert Level was raised to 3 (the second highest level on a four-level scale) and the Aviation Color Code was raised to Orange (the second highest color on a four-color scale).

Small frequent phreatic eruptions, mostly at Boca C, continued during 8-9 March. In a special report issued at 1000 on 9 March OVSICORI-UNA reported that two shock waves identified in infrasound data signified an eruptive event. Steam plumes rose several hundred meters and material was likely ejected as high as 200 m above the vent, though visual confirmation was obscured by the plumes. Phreatic eruptions at 1053, 1236, and 1821 on 9 March generated gas-and-steam plumes that rose as high as 1 km; the plumes obscured views of the crater. Sulfur dioxide emissions detected in satellite data averaged 538 tons per day. Notably, during the evening, eight volcano-tectonic events associated with rock fracturing were recorded in both seismic and infrasound data. Activity continued during 9-10 March mainly from Boca C and some from Boca A. The phreatic eruptions ejected material 200-400 m above the crater floor and generated steam-and-gas plumes that rose as high as 1 km. The ponds continued to shrink and the water had a high sediment content. Blocks up to 1 m in diameter were ejected from the vents onto the crater floor and sediments rich in native sulfur were deposited around the edges of the small ponds. Eruptive activity continued on 11 March at similar levels, moderate- to high-level tremor was recorded, and inflation continued.

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

Turrialba (Costa Rica) | 5 March-11 March 2025 | New Activity / Unrest Cite this Report

Turrialba
Central America Volcanic Arc

The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported that the seismic network at Turrialba recorded signals during 9-10 March that were likely related to small landslides of material within West Crater. Gas emissions remained at low levels.

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

Ahyi (United States) | 5 March-11 March 2025 | Continuing ActivityCite this Report

Ahyi
Mariana Volcanic Arc

Unrest at Ahyi Seamount continued during 28 February-7 March. A plume of discolored water in the vicinity of the seamount was identified in a satellite image on 3 March, indicating possible submarine activity. Weather clouds obscured views during the rest of the week. No signals coming from the direction of Ahyi were identified in data from underwater pressure sensors near Wake Island (about 2,270 km E of Ahyi). The Aviation Color Code remained at Yellow (the second lowest level on a four-color scale) and the Volcano Alert Level remained at Advisory (the second lowest level on a four-level scale).

Source: US Geological Survey

Aira (Japan) | 5 March-11 March 2025 | Continuing ActivityCite this Report

Aira
Ryukyu Volcanic Arc

The Japan Meteorological Agency (JMA) reported ongoing eruptive activity at Minamidake Crater (Aira Caldera’s Sakurajima volcano) during 3-10 March. Nightly crater incandescence was visible in webcam images. An explosion at 0523 on 4 March generated an ash plume that rose 1.5 km above the crater rim, drifted NE, and merged into weather clouds. The explosion ejected large blocks 600-900 m from the vent. Eruptive events at 0851 on 6 March, at 1640, 1704, 1808, and 2003 on 7 March, at 0031 on 8 March, and at 1525, 1645, and 1714 on 9 March generated ash plumes that rose 1-1.2 km above the crater rim and sometimes drifted NE or SE. Explosions at 1502 on 9 March and at 1124, 1604, and 2206 on 10 March produced ash plumes that rose as high as 1.3 km above the crate rim and drifted S and N. The explosion at 2206 on 10 March ejected blocks 600-900 m from the vent. The Alert Level remained at 3 (on a 5-level scale), and the public was warned to stay 1 km away from both craters.

Source: Japan Meteorological Agency (JMA)

Dukono (Indonesia) | 5 March-11 March 2025 | Continuing ActivityCite this Report

Dukono
Halmahera Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that the eruption at Dukono was ongoing during 26 February-4 March. Daily white-and-gray or gray-to-black ash plumes that were often dense rose as high as 1.2 km above the crater rim and drifted NE, NW, W, and S. Booming sounds were reported during 6-7 March. An explosion on 9 March was heard as far as the Dukono observation post (11 km N). The Alert Level remained at Level 2 (on a scale of 1-4) and the public was warned to stay 4 km away from the Malupang Warirang Crater.

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

Great Sitkin (United States) | 5 March-11 March 2025 | Continuing ActivityCite this Report

Great Sitkin
Aleutian Ridge Volcanic Arc

The Alaska Volcano Observatory (AVO) reported that slow lava effusion continued to feed a thick flow in Great Sitkin’s summit crater during 5-11 March, confirmed by a 6 March radar image. Small daily earthquakes were detected by the seismic network. Weather clouds often obscured satellite and webcam views of the volcano. 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)

Home Reef (Tonga) | 5 March-11 March 2025 | Continuing ActivityCite this Report

Home Reef
Tofua Volcanic Arc

The Tonga Geological Services reported that thermal activity at Home Reef had increased since 21 February with the last thermal anomaly detected on 4 March. Weather conditions sometimes prevented satellite observations during 21 February-7 March. Infrasound data was evidence of continuing minor eruptive activity. The Maritime Alert Level remained at Orange (the third level on a four-level scale), and mariners were advised to stay at least 2 nautical miles (3.7 km) away from the island. The Aviation Color Code remained at Yellow (the second level on a four-level scale), and the Alert Level for residents of Vava’u and Ha’apai remained at Green (the first level on a four-level scale).

Source: Tonga Geological Services, Government of Tonga

Ibu (Indonesia) | 5 March-11 March 2025 | Continuing ActivityCite this Report

Ibu
Halmahera Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that the eruption at Ibu continued during 5-11 March. Multiple daily gray or white-and-gray ash plumes that were often dense rose as high as 1.5 km above the summit and drifted mainly NW, W, and SW. Minor incandescence at the summit was visible in some webcam images posted with the reports. The Alert Level remained at 3 (the second highest level on a four-level scale) and the public was advised to stay 4 km away from the active crater and 5 km away from the N crater wall opening.

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

Kanlaon (Philippines) | 5 March-11 March 2025 | Continuing ActivityCite this Report

Kanlaon
Negros-Sulu Volcanic Arc

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported continuing eruptive activity at Kanlaon during 4-11 March. The seismic network recorded 3-19 daily volcanic earthquakes, including 1-2 periods of volcanic tremor lasting from five minutes to three hours and two minutes during 6-7 and 9 March. Average daily sulfur dioxide emissions ranged from 1,712 to 3,144 tonnes per day. Gas-and-steam emissions that were often continuous and occasionally contained ash rose as high as 300 m above the summit and drifted NW, W, and SW. There were 1-2 periods of ash emissions lasting 1-15 minutes during 4-5, 7, and 9 March, and seven periods of ash emissions on 6 March lasting eight minutes to nearly three hours. The Alert Level remained at 3 (on a scale of 0-5); the public was warned to stay 6 km away from the summit and pilots were warned not to fly close to the volcano.

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)

Kilauea (United States) | 5 March-11 March 2025 | Continuing ActivityCite this Report

Kilauea
Hawaiian-Emperor Hotspot Volcano Group

The Hawaiian Volcano Observatory (HVO) reported that the eruption within Kilauea’s Kaluapele summit caldera, from vents along the SW margin of Halema’uma’u Crater, continued at variable levels during 4-11 March. Lava fountaining and lava flow effusion from cones at both the N and S vents began around 0730 on 4 March and continued at variable levels through the day. Lava fountains at the N vent were rising over 100 m by 1430. At around the same time low dome fountains began rising from the S vent and lava flows advanced onto the crater floor. The fountains started to grow taller by 1500 and by 1520 they were 100-130 m tall, the same height as fountains at the N vent. Fountains at the S vent continued to rise and approached 180 m tall, while fountains at the N vent decreased in height. In addition to the activity at the N and S vents, small breakouts were visible on the rootless flows near the September 2023 vents on the down-dropped block in the E part of Halema’uma’u. Fountaining at the N vent ceased at 2026. Fountains at the S vent dropped to 90-120 m and continued to be active overnight. The N vent produced occasional bursts of spatter. Sustained lava fountains at the S vent decreased to 30-60 m during 0300-0430 on 5 March. Fountaining at the S vent increased at around 0800, and the N vent briefly resumed fountaining and erupting lava flows during 0842-0911. Lava flows covered more than two thirds of the crater floor. Activity at both vents ceased by 1030. Sulfur dioxide emission averaged approximately 35,000 tonnes per day (t/d) during the period of high fountaining on the afternoon of 4 March, then decreased to 20,000 t/d during lower fountaining on the morning of 5 March, and to 1,800 t/d by the afternoon. The flows from the N and S vents were active during 5-6 March with ooze outs and small crustal overturns, but the activity had ceased by the morning of 7 March. Sulfur dioxide emission averaged 1,000 t/d on 7 March.

Incandescence from both the N and S vents was visible during 8-10 March. At about 0130 on 10 March small, sporadic, spatter fountains at the N vent rose 5-10 m high and continued to intensify until 1835. Spattering was visible overnight. Lava flows emerged from the N vent at 0236 on 11 March and tall fountaining started 10 minutes later. By 0330 the fountains were 120-150 m tall and lava covered up to one-third of the crater floor. Lava flows unrelated to the activity at the N and S vents continued to spread out on the down-dropped block in the E part of the crater during 5-10 March and were possibly fed from by older stored lava from beneath the crater floor. 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 Hawaiian Volcano Observatory (HVO)

Lewotobi (Indonesia) | 5 March-11 March 2025 | Continuing ActivityCite this Report

Lewotobi
Sunda Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity continued at Lewotobi Laki-laki during 5-11 March. Eruptive events were detected on 5 and 7 March, though not confirmed visually; weather clouds sometimes prevented observations. Gray ash plumes that were sometimes dense rose as high as 2 km above the summit and drifted multiple directions during 8-11 March. Incandescence at the summit was occasionally visible in webcam images posted with the reports. The Alert Level remained at 3 (on a scale of 1-4) and the public was warned to stay 5 km away from the center of Laki-laki and 6 km in a semicircle clockwise from the SW to the NE.

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

Lewotolok (Indonesia) | 5 March-11 March 2025 | Continuing ActivityCite this Report

Lewotolok
Sunda Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that an eruption at Lewotolok was ongoing during 5-11 March. White-and-gray ash plumes that were sometimes dense rose as high as 600 m above the summit and drifted E and SE, W, and NW. Rumbling sounds were reported on 10 March. The Alert Level remained at 2 (on a scale of 1-4) and the public was warned to stay 2 km away from the vent and 2.5 km away on the S, SE, and W flanks.

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

Marapi (Indonesia) | 5 March-11 March 2025 | Continuing ActivityCite this Report

Marapi
Sunda Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity at Marapi continued during 5-11 March. At 0245 on 7 March a gray dense ash plume rose 1.2 km above the summit and drifted N. Almost two hours later, at 0431, a webcam image showed crater incandescence. An eruptive event at 1041 on 8 March was recorded by the seismic network but not visually observed. The Alert Level remained at 2 (on a scale of 1-4) and the public was warned to stay 3 km away from the active crater.

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

Merapi (Indonesia) | 5 March-11 March 2025 | Continuing ActivityCite this Report

Merapi
Sunda Volcanic Arc

The Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG) reported that the eruption at Merapi (on Java) continued during 28 February-6 March. Seismicity was at higher levels that the previous week. The SW lava dome produced 57 lava avalanches that traveled as far as 2 km SW down the Bebeng drainage, 43 that traveled as far as 2 km SW down the Krasak drainage, and 34 that traveled as far as 2 km SW down the Sat/Putih drainage. Slight morphological changes to the SW lava dome resulting from continuing effusion and 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)

Nevado del Ruiz (Colombia) | 5 March-11 March 2025 | Continuing ActivityCite this Report

Nevado del Ruiz
Northern Andean Volcanic Arc

The Servicio Geológico Colombiano’s (SGC) Observatorio Vulcanológico y Sismológico de Manizales reported that eruptive activity at Nevado del Ruiz continued during 4-11 March. Seismic data indicated that events associated with fluid movement increased in both number and intensity compared to the previous week. Some of the seismic events were associated with pulsating ash emissions; webcam images confirmed these ash emissions, including some with higher-temperature ejecta. Gas-and-ash plumes rose as high as 1.1 km above the summit; at 0850 on 5 March a plume rose as high as 2.2 km above the summit as it drifted downwind. Notably, at 0100 on 11 March, a gas-and-ash emission was associated with a more intense thermal anomaly. Seismicity associated with rock fracturing increased in number but lower in magnitude compared to the previous week. The earthquakes were mainly located below Arenas Crater and the NE flank within 5 km, with depths of 2-6 km, and a fewer number occurred below the E, SE, and SW flanks. Low-energy thermal anomalies on the crater floor were identified in satellite data, though on 11 March the anomaly was characterized as moderate. Sulfur dioxide emissions detected in satellite data continued to be significant. The Alert Level remained at Yellow (the second level on a four-level scale), and the public was warned to stay out of the restricted areas around Arenas Crater, not to spend long periods of time on the Murillo-Cerro Gualí Road, and to avoid drainages in the high-threat zones.

Source: Servicio Geológico Colombiano (SGC)

Semeru (Indonesia) | 5 March-11 March 2025 | Continuing ActivityCite this Report

Semeru
Sunda Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity continued at Semeru during 26 February-4 March, with multiple, daily eruptive events recorded by the seismic network. Daily white-and-gray or gray ash plumes rose 200-1,300 m above the summit and drifted in multiple directions. The Alert Level remained at 2 (the second lowest level 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)

Suwanosejima (Japan) | 5 March-11 March 2025 | Continuing ActivityCite this Report

Suwanosejima
Ryukyu Volcanic Arc

The Japan Meteorological Agency (JMA) reported that eruptive activity at Suwanosejima's Ontake Crater continued during 3-10 March. Incandescence was observed nightly in webcam images. Eruptive activity generated emissions that rose 800 m above the crater rim. No changes around the crater were observed during a 5 March aerial observation. The Alert Level remained at 2 (the second level on a five-level scale) and the public was warned to stay at least 1.5 km away from the crater.

Source: Japan Meteorological Agency (JMA)

Weekly Reports Archive

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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.

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