Etna (Sicily, Italy): (4 Sep) From the latest Sentinel-2 false color composite, the effusive eruption from the Southeast crater seems to have stopped.
In the attached GIF, the lava flow eruption from the flank vents halted on 2 September.
Kusatsu-Shirane (Honshu): (4 Sep) The Japan Meteorological Agency (JMA) reported that unrest activity increased at Kusatsu-Shiranesan between 2 September 2025 (local) and 3 September 2025 (local). The alert level at Kusatsu-Shiranesan remained at „Level 2 – Restriction on proximity to the crater“ (on a 5-level scale).
Source: Japan Meteorological Agency (JMA)
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Suwanose-jima (Ryukyu Islands): (4 Sep) The Japan Meteorological Agency (JMA) reported that the eruption continued at Suwanosejima between 1 September 2025 (local) and 3 September 2025 (local). The alert level at Suwanosejima remained at „Level 2 – Restriction on proximity to the crater“ (on a 5-level scale).
Source: Japan Meteorological Agency (JMA)
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Telong (northern Sumatra, Indonesia): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Telong, Bur ni on 3 September 2025 (local). The alert level at Telong, Bur ni remained at „Level 2 – Alert“ (on a 4-level scale).
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Karangetang (Siau Island, Sangihe Islands, Indonesia): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Karangetang on 3 September 2025 (local). The alert level at Karangetang remained at „Level 2 – Alert“ (on a 4-level scale). Plumes rose to a maximum of 25 meters (82 feet) above the vent.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Raung (East Java): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Raung on 3 September 2025 (local). The alert level at Raung remained at „Level 2 – Alert“ (on a 4-level scale).
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Ibu (Halmahera, Indonesia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070 and is moving at 10 kts in W direction.
The full report is as follows: VA TO FL070 LAST REP AT 04/1325Z EST VA DTG:04/1410Z to 7000 ft (2100 m)
…4 Sep:
The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Ibu on 3 September 2025 (local). The alert level at Ibu remained at „Level 2 – Alert“ (on a 4-level scale). The aviation alert level remained at „Orange“ (level 3 on a 4-level scale). There were 114 explosions reported, with plumes rising to a maximum of 700 meters (2,297 feet) above the vent.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Tangkubanparahu (West Java): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Tangkuban Parahu on 3 September 2025 (local). The alert level at Tangkuban Parahu remained at „Level 1 – Normal“ (on a 4-level scale).
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Dieng (Central Java): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Dieng Volcanic Complex on 3 September 2025 (local). The alert level at Dieng Volcanic Complex remained at „Level 2 – Alert“ (on a 4-level scale). Plumes rose to a maximum of 20 meters (66 feet) above the vent.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Lewotobi (Flores): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Lewotobi (Laki-Laki) on 3 September 2025 (local). The alert level at Lewotobi (Laki-Laki) remained at „Level 3 – Standby“ (on a 4-level scale). The aviation alert level remained at „Orange“ (level 3 on a 4-level scale). Plumes rose to a maximum of 200 meters (656 feet) above the vent.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Soputan (North Sulawesi, Indonesia): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Soputan on 3 September 2025 (local). The alert level at Soputan remained at „Level 2 – Alert“ (on a 4-level scale).
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Lewotolo (Lesser Sunda Islands): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Lewotolok on 3 September 2025 (local). The alert level at Lewotolok remained at „Level 3 – Standby“ (on a 4-level scale). There were 178 explosions reported, with plumes rising to a maximum of 500 meters (1,640 feet) above the vent. There were 2 seismically detected rockfalls.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Merapi (Central Java, Indonesia): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Merapi on 3 September 2025 (local). The alert level at Merapi remained at „Level 3 – Standby“ (on a 4-level scale). Plumes rose to a maximum of 150 meters (492 feet) above the vent. There were 5 observed hot rockfalls and 65 seismically detected rockfalls, traveling up to 1,500 m.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Semeru (East Java, Indonesia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 14000 ft (4300 m) altitude or flight level 140 .
The full report is as follows: VA TO FL140 REP AT 04/1701Z MOV SW EST VA DTG:04/1730Z to 14000 ft (4300 m)
…4 Sep:
The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Semeru on 3 September 2025 (local). The alert level at Semeru remained at „Level 2 – Alert“ (on a 4-level scale). The aviation alert level remained at „Orange“ (level 3 on a 4-level scale). There were 45 explosions reported, with plumes rising to a maximum of 600 meters (1,969 feet) above the vent. There were 2 seismically detected rockfalls.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Papandayan (West Java): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Papandayan on 3 September 2025 (local). The alert level at Papandayan remained at „Level 1 – Normal“ (on a 4-level scale). Plumes rose to a maximum of 5 meters (16 feet) above the vent.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
… [read more]
Marapi (Western Sumatra, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VA REP AT 04/1444Z EST VA DTG:04/1500Z
…4 Sep:
The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Marapi on 3 September 2025 (local). The alert level at Marapi remained at „Level 2 – Alert“ (on a 4-level scale). Plumes rose to a maximum of 150 meters (492 feet) above the vent.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Dempo (Sumatra): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Dempo on 3 September 2025 (local). The alert level at Dempo remained at „Level 2 – Alert“ (on a 4-level scale).
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
… [read more]
Dukono (Halmahera): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Dukono on 3 September 2025 (local). The alert level at Dukono remained at „Level 2 – Alert“ (on a 4-level scale). The aviation alert level remained at „Orange“ (level 3 on a 4-level scale). There were 10 explosions reported, with plumes rising to a maximum of 400 meters (1,312 feet) above the vent.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Gede-Pangrango (West Java): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Gede-Pangrango on 3 September 2025 (local). The alert level at Gede-Pangrango remained at „Level 1 – Normal“ (on a 4-level scale). Plumes rose to a maximum of 50 meters (164 feet) above the vent.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Awu (Sulawesi & Sangihe Islands): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Awu on 3 September 2025 (local). The alert level at Awu remained at „Level 2 – Alert“ (on a 4-level scale). Plumes rose to a maximum of 100 meters (328 feet) above the vent.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Kerinci (Sumatra): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Kerinci on 3 September 2025 (local). The alert level at Kerinci remained at „Level 2 – Alert“ (on a 4-level scale). Plumes rose to a maximum of 150 meters (492 feet) above the vent.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Kelimutu (Flores): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Kelimutu on 3 September 2025 (local). The alert level at Kelimutu remained at „Level 1 – Normal“ (on a 4-level scale). Plumes rose to a maximum of 5 meters (16 feet) above the vent.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
… [read more]
Lokon-Empung (North Sulawesi, Indonesia): (4 Sep) The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest activity increased at Lokon-Empung on 3 September 2025 (local). The alert level at Lokon-Empung was raised to „Level 3 – Standby“ (on a 4-level scale). At 1200 on 3 September, the alert level was raised due to increased seismicity and inflationary ground deformation. The public was advised to maintain a distance of at least 2.5 km from Tompaluan crater. Plumes rose to a maximum of 50 meters (164 feet) above the vent.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
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Kilauea (Hawai’i): (4 Sep) The United States Geological Survey – Hawaiian Volcano Observatory (USGS-HVO) reported that the eruption continued at Kilauea on 3 September 2025 (local). The alert level at Kilauea remained at „Watch“ (level 3 on a 4-level scale). The aviation alert level remained at „Orange“ (level 3 on a 4-level scale).
Source: United States Geological Survey – Hawaiian Volcano Observatory (USGS-HVO)
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Shishaldin (Aleutian Islands, Alaska): (4 Sep) The United States Geological Survey – Alaska Volcano Observatory (USGS-AVO) reported that unrest continued at Shishaldin between 2 September 2025 (local) and 3 September 2025 (local). The alert level at Shishaldin remained at „Advisory“ (level 2 on a 4-level scale). The aviation alert level remained at „Yellow“ (level 2 on a 4-level scale).
Source: United States Geological Survey – Alaska Volcano Observatory (USGS-AVO)
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Great Sitkin (United States, Aleutian Islands): (4 Sep) The United States Geological Survey – Alaska Volcano Observatory (USGS-AVO) reported that the eruption continued at Great Sitkin between 2 September 2025 (local) and 3 September 2025 (local). The alert level at Great Sitkin remained at „Watch“ (level 3 on a 4-level scale). The aviation alert level remained at „Orange“ (level 3 on a 4-level scale). Lava continued to erupt in the summit crater.
Source: United States Geological Survey – Alaska Volcano Observatory (USGS-AVO)
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Santiaguito (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 14000 ft (4300 m) altitude or flight level 140 .
The full report is as follows: VA EMS OBS to 14000 ft (4300 m)
…4 Sep:
The Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología (INSIVUMEH) reported that the eruption continued at Santa María between 2 September 2025 (local) and 3 September 2025 (local). The alert level at Santa María was unavailable or not collected.
Source: Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología (INSIVUMEH)
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Pacaya (Guatemala): (4 Sep) The Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología (INSIVUMEH) reported that unrest continued at Pacaya between 2 September 2025 (local) and 3 September 2025 (local). The alert level at Pacaya was unavailable or not collected.
Source: Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología (INSIVUMEH)
… [read more]
Fuego (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 14000 ft (4300 m) altitude or flight level 140 .
The full report is as follows: FREQUENT VA EMS to 14000 ft (4300 m)
…4 Sep:
The Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología (INSIVUMEH) reported that the eruption continued at Fuego between 2 September 2025 (local) and 3 September 2025 (local). The alert level at Fuego was unavailable or not collected. There were explosions reported, occurring at a rate of up to 9 per hour, with plumes rising to a maximum of 437 meters (1,434 feet) above the vent. There were observed rockfalls. Moderate crater incandescence was observed during the night and early morning. Some explosions produced rumbles; some noises resembling train engines lasted from 3 to 5 minutes. Some explosions generated shockwaves.
Source: Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología (INSIVUMEH)
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Turrialba (Costa Rica): (4 Sep) The Observatorio Vulcanológico y Sismológico de Costa Rica – Universidad Nacional (OVSICORI-UNA) reported that unrest continued at Turrialba between 2 September 2025 (local) and 3 September 2025 (local). The alert level at Turrialba remained at „Level 2 – Warning“ (on a 0–4 level scale).
Source: Observatorio Vulcanológico y Sismológico de Costa Rica – Universidad Nacional (OVSICORI-UNA)
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Rincón de la Vieja (Costa Rica): (4 Sep) The Observatorio Vulcanológico y Sismológico de Costa Rica – Universidad Nacional (OVSICORI-UNA) reported that unrest continued at Rincón de la Vieja between 2 September 2025 (local) and 3 September 2025 (local). The alert level at Rincón de la Vieja remained at „Level 2 – Warning“ (on a 0–4 level scale). The aviation alert level remained at „Yellow“ (level 2 on a 4-level scale).
Source: Observatorio Vulcanológico y Sismológico de Costa Rica – Universidad Nacional (OVSICORI-UNA)
… [read more]
Poas (Costa Rica): (4 Sep) The Observatorio Vulcanológico y Sismológico de Costa Rica – Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 2 September 2025 (local) and 3 September 2025 (local). The alert level at Poás remained at „Level 2 – Warning“ (on a 0–4 level scale). The aviation alert level remained at „Yellow“ (level 2 on a 4-level scale). There were 2 seismically detected eruptions reported.
Source: Observatorio Vulcanológico y Sismológico de Costa Rica – Universidad Nacional (OVSICORI-UNA)
… [read more]
Nevado del Ruiz (Colombia): (4 Sep) Volcanic Ash Advisory Center Washington (VAAC) issued the following report: NEW VA EMS
Sangay (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 22000 ft (6700 m) altitude or flight level 220 .
The full report is as follows: VA EMS CONT to 22000 ft (6700 m)
…4 Sep:
The Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN) reported that the eruption continued at Sangay between 2 September 2025 (local) and 3 September 2025 (local). The alert level at Sangay remained at „2 – Yellow“ (on a 4-level scale). There were 33 seismically detected explosions reported. Incandescence from the crater was observed during the night on 2 September.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
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Reventador (Ecuador): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: PSBL VA EMS
…4 Sep:
The Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN) reported that the eruption continued at Reventador between 2 September 2025 (local) and 3 September 2025 (local). The alert level at Reventador remained at „3 – Orange“ (on a 4-level scale). There were 75 seismically detected explosions reported. Plumes rose to a maximum of 900 meters (2,953 feet) above the vent. There were observed incandescent rockfalls. Crater incandescence was observed during the night on 2 September.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
… [read more]