Volcanic activity worldwide 17 Sep 2025: Santiaguito volcano, Fuego, Popocatépetl, Merapi, Semeru, …

Bezymianny (Kamchatka): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: VA IS NOT IDENTIFIABLE IN SATELLITE IMAGERY.

Kusatsu-Shirane (Honshu): The Japan Meteorological Agency (JMA) reported that unrest activity increased at Kusatsu-Shiranesan between 15 September 2025 (local) and 16 September 2025 (local). The alert level remained at „Level 2 – Restriction on proximity to the crater“ (on a 5-level scale).
Source: Japan Meteorological Agency (JMA)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „Level 2 – Restriction on proximity to the crater“ (on a 5-level scale)

Suwanose-jima (Ryukyu Islands): The Japan Meteorological Agency (JMA) reported that the eruption continued at Suwanosejima on 16 September 2025 (local). The alert level remained at „Level 2 – Restriction on proximity to the crater“ (on a 5-level scale).
Source: Japan Meteorological Agency (JMA)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „Level 2 – Restriction on proximity to the crater“ (on a 5-level scale)

Canlaon (Central Philippines): The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported that the eruption continued at Kanlaon on 16 September 2025 (local). Plume(s) rose to a maximum of 300 meters (984 feet) above the vent. The alert level remained at „2 – Moderate Level of Volcanic Unrest“ (level 2 on a 0–5 level scale).
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „2 – Moderate Level of Volcanic Unrest“ (level 2 on a 0–5 level scale)

Taal (Luzon, Philippines): The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported that unrest continued at Taal on 16 September 2025 (local). Plume(s) rose to a maximum of 600 meters (1,969 feet) above the vent. A total of 4 episodes of volcanic tremor were recorded. The continuous tremor episode that began at approximately 0150 on 16 September continued. The alert level remained at „1 – Low-Level Unrest“ (on a 0–5 level scale).
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „1 – Low-Level Unrest“ (on a 0–5 level scale)

Mayon (Luzon Island, Philippines): The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported that unrest continued at Mayon on 16 September 2025 (local). Plume(s) rose to a maximum of 500 meters (1,640 feet) above the vent. Very faint crater incandescence, observable only through a telescope, was reported. The alert level remained at „1 – Abnormal“ (on a 0–5 level scale).
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „1 – Abnormal“ (on a 0–5 level scale)

Bulusan (Luzon Island, Philippines): The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported that unrest continued at Bulusan on 16 September 2025 (local). Plume(s) were reported. The alert level remained at „1 – Low Level of Volcanic Unrest“ (level 1 on a 0–5 level scale).
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „1 – Low Level of Volcanic Unrest“ (level 1 on a 0–5 level scale)

Karangetang (Siau Island, Sangihe Islands, Indonesia): The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Karangetang on 16 September 2025 (local). Gas and vapor plume(s) rose to a maximum of 50 meters (164 feet) above the vent. The alert level 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] … [show less]
Current Alerts:
Observatory alert level: „Level 2 – Alert“ (on a 4-level scale)

Raung (East Java): The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Raung on 16 September 2025 (local). Gas and vapor plume(s) rose to a maximum of 100 meters (328 feet) above the vent. The alert level 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] … [show less]
Current Alerts:
Observatory alert level: „Level 2 – Alert“ (on a 4-level scale)

Ibu (Halmahera, Indonesia): The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Ibu on 16 September 2025 (local). There were 80 explosions reported, with plumes rising to a maximum of 400 meters (1,312 feet) above the vent. The alert level 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] … [show less]
Current Alerts:
Observatory alert level: „Level 2 – Alert“ (on a 4-level scale)

Lewotobi (Flores): The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that eruptive activity decreased at Lewotobi (Laki-Laki) on 16 September 2025 (local). The public was advised to maintain a minimum distance of at least 6 km from Lewotobi Laki-laki. The alert level was lowered to „Level 3 – Standby“ (on a 4-level scale) on 16 September 2025 at 15:00by CVGHM/PVMBG due to decreased eruptive activity. Gas and vapor plume(s) 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)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „Level 3 – Standby“ (on a 4-level scale)

Lewotolo (Lesser Sunda Islands): The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Lewotolok on 16 September 2025 (local). There were 214 explosions reported, with plumes rising to a maximum of 500 meters (1,640 feet) above the vent. There was 1 seismically detected rockfall. The alert level remained at „Level 3 – Standby“ (on a 4-level scale).
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „Level 3 – Standby“ (on a 4-level scale)

Merapi (Central Java, Indonesia): The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Merapi on 16 September 2025 (local). Gas and vapor plume(s) rose to a maximum of 50 meters (164 feet) above the vent. There were 12 hot rockfalls, traveling up to 2,000 m. There were 104 seismically detected rockfalls. The alert level remained at „Level 3 – Standby“ (on a 4-level scale).
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „Level 3 – Standby“ (on a 4-level scale)

Semeru (East Java, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ERUPTION LAST REPORTED AT 17/0931Z EST VA DTG:17/1620Z
…17 Sep:
The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Semeru on 16 September 2025 (local). There were 54 seismically detected explosions reported. There were 9 seismically detected rockfalls. The alert level 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] … [show less]
Current Alerts:
Observatory alert level: „Level 2 – Alert“ (on a 4-level scale)

Marapi (Western Sumatra, Indonesia): The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Marapi on 16 September 2025 (local). There was 1 seismically detected explosion reported. The alert level 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] … [show less]
Current Alerts:
Observatory alert level: „Level 2 – Alert“ (on a 4-level scale)

Dempo (Sumatra): The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Dempo on 16 September 2025 (local). The alert level 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] … [show less]
Current Alerts:
Observatory alert level: „Level 2 – Alert“ (on a 4-level scale)

Dukono (Halmahera): The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Dukono on 16 September 2025 (local). Ash and gas plume(s) rose to a maximum of 400 meters (1,312 feet) above the vent. The alert level 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] … [show less]
Current Alerts:
Observatory alert level: „Level 2 – Alert“ (on a 4-level scale)

Awu (Sulawesi & Sangihe Islands): The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Awu on 16 September 2025 (local). Gas and vapor plume(s) rose to a maximum of 200 meters (656 feet) above the vent. The alert level 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] … [show less]
Current Alerts:
Observatory alert level: „Level 2 – Alert“ (on a 4-level scale)

Kerinci (Sumatra): The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Kerinci on 16 September 2025 (local). Gas and vapor plume(s) rose to a maximum of 100 meters (328 feet) above the vent. The alert level 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] … [show less]
Current Alerts:
Observatory alert level: „Level 2 – Alert“ (on a 4-level scale)

Iliwerung (Lesser Sunda Islands): The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Iliwerung on 16 September 2025 (local). The alert level 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)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „Level 1 – Normal“ (on a 4-level scale)

Lokon-Empung (North Sulawesi, Indonesia): The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Lokon-Empung on 16 September 2025 (local). Gas and vapor plume(s) rose to a maximum of 200 meters (656 feet) above the vent. The alert level remained at „Level 3 – Standby“ (on a 4-level scale).
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „Level 3 – Standby“ (on a 4-level scale)

Kilauea (Hawai’i): The United States Geological Survey – Hawaiian Volcano Observatory (USGS-HVO) reported that the eruption continued at Kilauea on 16 September 2025 (local). Moderate glow was observed at the north and south vents in webcam images during the night. The alert level 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)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „Watch“ (level 3 on a 4-level scale)

Shishaldin (Aleutian Islands, Alaska): The United States Geological Survey – Alaska Volcano Observatory (USGS-AVO) reported that unrest continued at Shishaldin between 15 September 2025 (local) and 16 September 2025 (local). Clear webcam images showed minor steaming at the summit crater. The alert level remained at „Advisory“ (level 2 on a 4-level scale). The aviation alert level remained at „Yellow“ (level 2 on a 4-level scale). Activity also included: SO2 degassing.
Source: United States Geological Survey – Alaska Volcano Observatory (USGS-AVO)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „Advisory“ (level 2 on a 4-level scale)

Great Sitkin (United States, Aleutian Islands): The United States Geological Survey – Alaska Volcano Observatory (USGS-AVO) reported that the eruption continued at Great Sitkin between 15 September 2025 (local) and 16 September 2025 (local). Lava continued to erupt in the summit crater. Satellite images indicated that lava near the vent continued to slowly advance at a rate of approximately 5 meters per day. The alert level 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 – Alaska Volcano Observatory (USGS-AVO)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „Watch“ (level 3 on a 4-level scale)

Popocatépetl (Central Mexico): The Centro Nacional de Prevención de Desastres (CENAPRED) reported that the eruption continued at Popocatépetl between 15 September 2025 (local) and 16 September 2025 (local). Ash and gas plume(s) were reported. The alert level remained at „Yellow Alert – Phase 2“ (level 4 on a 7-level scale).
Source: Centro Nacional de Prevención de Desastres (CENAPRED)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „Yellow Alert – Phase 2“ (level 4 on a 7-level scale)

Santiaguito (Guatemala): The Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología (INSIVUMEH) reported that the eruption continued at Santa María between 15 September 2025 (local) and 16 September 2025 (local). Gas and vapor plume(s) rose to a maximum of 400 meters (1,312 feet) above the vent. Incandescence was observed at El Caliente dome during the night and early morning. There were explosions reported, with plumes rising to a maximum of 800 meters (2,625 feet) above the vent. At approximately 1305 on 16 September, heavy rain triggered a flow of water, hot pyroclastic material, tree trunks, branches, and rocky debris (up to 3 m in diameter) down the Cabello de Ãngel ravine (SE flank) of Caliente dome. There were incandescent rockfalls.
Source: Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología (INSIVUMEH)
… [read more] … [show less]
Current Alerts:
Observatory alert level: unavailable or not collected

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: VA EMS LKLY OBS to 14000 ft (4300 m)
…17 Sep:
The Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología (INSIVUMEH) reported that the eruption continued at Fuego between 15 September 2025 (local) and 16 September 2025 (local). Crater incandescence was observed during the night and early morning. Weak and moderate Strombolian explosions were recorded at a rate of 8–12 per hour, generating ash-and-gas plumes that reached as high as 4,800 m above sea level. Shockwaves were generated by explosions. Explosions were accompanied by rumbling noises. Continuous degassing activity produced sounds resembling a train engine. Fine ash fell on communities near the SW flank. Gas and vapor plume(s) rose to a maximum of 200 meters (656 feet) above the vent.
Source: Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología (INSIVUMEH)
… [read more] … [show less]
Current Alerts:
Observatory alert level: unavailable or not collected

Turrialba (Costa Rica): The Observatorio Vulcanológico y Sismológico de Costa Rica – Universidad Nacional (OVSICORI-UNA) reported that unrest continued at Turrialba between 13 September 2025 (local) and 16 September 2025 (local). The alert level remained at „Level 2 – Warning“ (on a 0–4 level scale).
Source: Observatorio Vulcanológico y Sismológico de Costa Rica – Universidad Nacional (OVSICORI-UNA)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „Level 2 – Warning“ (on a 0–4 level scale)

Rincón de la Vieja (Costa Rica): The Observatorio Vulcanológico y Sismológico de Costa Rica – Universidad Nacional (OVSICORI-UNA) reported that unrest continued at Rincón de la Vieja between 13 September 2025 (local) and 16 September 2025 (local). The alert level 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] … [show less]
Current Alerts:
Observatory alert level: „Level 2 – Warning“ (on a 0–4 level scale)

Poas (Costa Rica): The Observatorio Vulcanológico y Sismológico de Costa Rica – Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 13 September 2025 (local) and 16 September 2025 (local). Gas and vapor plume(s) were reported. The alert level 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] … [show less]
Current Alerts:
Observatory alert level: „Level 2 – Warning“ (on a 0–4 level scale)

Nevado del Ruiz (Colombia): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: NO VA OBS

Sangay (Ecuador): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: PSBL VA EMS
…17 Sep:
The Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN) reported that the eruption continued at Sangay between 15 September 2025 (local) and 16 September 2025 (local). Ash and gas plume(s) rose to a maximum of 1,200 meters (3,937 feet) above the vent. There were 94 seismically detected explosions reported. The alert level remained at „2 – Yellow“ (on a 4-level scale).
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „2 – Yellow“ (on a 4-level scale)

Reventador (Ecuador): The Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN) reported that the eruption continued at Reventador between 15 September 2025 (local) and 16 September 2025 (local). Ash and gas plume(s) rose to a maximum of 800 meters (2,625 feet) above the vent. There were 86 seismically detected explosions reported. There were incandescent rockfalls, descending 1,100 m below the crater. The alert level remained at „3 – Orange“ (on a 4-level scale).
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „3 – Orange“ (on a 4-level scale)

Sabancaya (Peru): The Centro Vulcanológico Nacional del Instituto Geofísico del Perú (CENVUL-IGP) reported that the eruption continued at Sabancaya on 16 September 2025 (local). Gas and vapor plume(s) rose to a maximum of 1,000 meters (3,281 feet) above the vent. The alert level remained at „Orange“ (level 3 on a 4-level scale).
Source: Centro Vulcanológico Nacional del Instituto Geofísico del Perú (CENVUL-IGP)
… [read more] … [show less]
Current Alerts:
Observatory alert level: „Orange“ (level 3 on a 4-level scale)

Volcano Activity Summary for 17 Sep 2025: