Dempo | Continuing eruption

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Dempo on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Dukono | Continuing eruption

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Dukono on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Great Sitkin | Continuing eruption

The United States Geological Survey - Alaska Volcano Observatory (USGS-AVO) reported that the eruption continued at Great Sitkin between 29 September 2025 (local) and 30 September 2025 (local). 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).

Observatory Alert Level: "Watch" (level 3 on a 4-level scale)
Aviation Alert Level: "Orange" (level 3 on a 4-level scale)

Source: United States Geological Survey - Alaska Volcano Observatory (USGS-AVO)

Ibu | Continuing eruption

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Ibu on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Kīlauea | Continuing eruption

The United States Geological Survey - Hawaiian Volcano Observatory (USGS-HVO) reported that the eruption continued at Kilauea on 30 September 2025 (local). Intermittent strong glow was observed at the south vent throughout the night and early morning. A total of 10 overflows were recorded between midnight and just before 0600 on 30 September. 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).

Observatory Alert Level: "Watch" (level 3 on a 4-level scale)
Aviation Alert Level: "Orange" (level 3 on a 4-level scale)

Source: United States Geological Survey - Hawaiian Volcano Observatory (USGS-HVO)

Kanlaon | Continuing eruption

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported that the eruption continued at Kanlaon on 30 September 2025 (local). The alert level remained at "2 - Moderate Level of Volcanic Unrest" (level 2 on a 0–5 level scale).

Observatory Alert Level: "2 - Moderate Level of Volcanic Unrest" (level 2 on a 0–5 level scale)
Aviation Alert Level: unavailable or not collected

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)

Lewotobi | Continuing eruption

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 30 September 2025 (local). The alert level remained at "Level 3 - Standby" (on a 4-level scale).

Observatory Alert Level: "Level 3 - Standby" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Lewotolok | Continuing eruption

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Lewotolok on 30 September 2025 (local). The alert level remained at "Level 3 - Standby" (on a 4-level scale).

Observatory Alert Level: "Level 3 - Standby" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Marapi | Continuing eruption

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Marapi on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Merapi | Continuing eruption

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Merapi on 30 September 2025 (local). The alert level remained at "Level 3 - Standby" (on a 4-level scale).

Observatory Alert Level: "Level 3 - Standby" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Popocatépetl | Continuing eruption

The Centro Nacional de Prevención de Desastres (CENAPRED) reported that the eruption continued at Popocatépetl between 29 September 2025 (local) and 30 September 2025 (local). The alert level remained at "Yellow Alert - Phase 2" (level 4 on a 7-level scale).

Observatory Alert Level: "Yellow Alert - Phase 2" (level 4 on a 7-level scale)
Aviation Alert Level: unavailable or not collected

Source: Centro Nacional de Prevención de Desastres (CENAPRED)

Poás | Continuing eruption

The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 30 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).

Observatory Alert Level: "Level 2 - Warning" (on a 0–4 level scale)
Aviation Alert Level: "Yellow" (level 2 on a 4-level scale)

Source: Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA)

Raung | Continuing eruption

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Raung on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Reventador | Continuing eruption

The Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN) reported that the eruption continued at Reventador between 29 September 2025 (local) and 30 September 2025 (local). The alert level remained at "3 - Orange" (on a 4-level scale).

Observatory Alert Level: "3 - Orange" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

Sabancaya | Continuing eruption

The Centro Vulcanológico Nacional del Instituto Geofísico del Perú (CENVUL-IGP) reported that the eruption continued at Sabancaya between 29 September 2025 (local) and 30 September 2025 (local). The alert level remained at "Orange" (level 3 on a 4-level scale).

Observatory Alert Level: "Orange" (level 3 on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Centro Vulcanológico Nacional del Instituto Geofísico del Perú (CENVUL-IGP)

Sangay | Continuing eruption

The Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN) reported that the eruption continued at Sangay between 29 September 2025 (local) and 30 September 2025 (local). The alert level remained at "2 - Yellow" (on a 4-level scale).

Observatory Alert Level: "2 - Yellow" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

Semeru | Continuing eruption

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Semeru on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Suwanosejima | Continuing eruption

The Japan Meteorological Agency (JMA) reported that the eruption continued at Suwanosejima on 30 September 2025 (local). The alert level remained at "Level 2 - Restriction on proximity to the crater" (on a 5-level scale).

Observatory Alert Level: "Level 2 - Restriction on proximity to the crater" (on a 5-level scale)
Aviation Alert Level: unavailable or not collected

Source: Japan Meteorological Agency (JMA)

Awu | Unrest

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Awu on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Bulusan | Unrest

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported that unrest continued at Bulusan on 30 September 2025 (local). The alert level remained at "1 - Low Level of Volcanic Unrest" (level 1 on a 0–5 level scale).

Observatory Alert Level: "1 - Low Level of Volcanic Unrest" (level 1 on a 0–5 level scale)
Aviation Alert Level: unavailable or not collected

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)

Bur ni Telong | Unrest

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Telong, Bur ni on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Dieng Volcanic Complex | Unrest

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Dieng Volcanic Complex on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Gamalama | Unrest

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Gamalama on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Karangetang | Unrest

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Karangetang on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Kerinci | Unrest

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Kerinci on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Krakatau | Unrest

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Krakatau on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Kusatsu-Shiranesan | Unrest

The Japan Meteorological Agency (JMA) reported that unrest continued at Kusatsu-Shiranesan between 29 September 2025 (local) and 30 September 2025 (local). The alert level remained at "Level 2 - Restriction on proximity to the crater" (on a 5-level scale).

Observatory Alert Level: "Level 2 - Restriction on proximity to the crater" (on a 5-level scale)
Aviation Alert Level: unavailable or not collected

Source: Japan Meteorological Agency (JMA)

Lokon-Empung | Unrest

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Lokon-Empung on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Mayon | Unrest

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported that unrest continued at Mayon on 30 September 2025 (local). The alert level remained at "1 - Abnormal" (on a 0–5 level scale).

Observatory Alert Level: "1 - Abnormal" (on a 0–5 level scale)
Aviation Alert Level: unavailable or not collected

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)

Rincón de la Vieja | Unrest

The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that unrest continued at Rincón de la Vieja on 30 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).

Observatory Alert Level: "Level 2 - Warning" (on a 0–4 level scale)
Aviation Alert Level: "Yellow" (level 2 on a 4-level scale)

Source: Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA)

Ruang | Unrest

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Ruang on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Shishaldin | Unrest

The United States Geological Survey - Alaska Volcano Observatory (USGS-AVO) reported that unrest continued at Shishaldin between 29 September 2025 (local) and 30 September 2025 (local). 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).

Observatory Alert Level: "Advisory" (level 2 on a 4-level scale)
Aviation Alert Level: "Yellow" (level 2 on a 4-level scale)

Source: United States Geological Survey - Alaska Volcano Observatory (USGS-AVO)

Sinabung | Unrest

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Sinabung on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Slamet | Unrest

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Slamet on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Soputan | Unrest

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Soputan on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Taal | Unrest

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported that unrest continued at Taal on 30 September 2025 (local). The alert level remained at "1 - Low-Level Unrest" (on a 0–5 level scale).

Observatory Alert Level: "1 - Low-Level Unrest" (on a 0–5 level scale)
Aviation Alert Level: unavailable or not collected

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)

Tengger Caldera | Unrest

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Tengger Caldera on 30 September 2025 (local). The alert level remained at "Level 2 - Alert" (on a 4-level scale).

Observatory Alert Level: "Level 2 - Alert" (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Turrialba | Unrest

The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that unrest continued at Turrialba on 30 September 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0–4 level scale).

Observatory Alert Level: "Level 2 - Warning" (on a 0–4 level scale)
Aviation Alert Level: unavailable or not collected

Source: Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA)