Lava effusion, dome growth, and minor Strombolian bursts at Mayon stood out today. Guatemala’s Fuego produced frequent explosions—up to 10 per hour—while Ecuador’s Sangay tallied hundreds of blasts and Peru’s Sabancaya showed a clear uptick. In the United States, Kilauea and Great Sitkin both held at Watch with Aviation Orange.
United States
Kilauea and Great Sitkin kept steady eruption status (Watch / Aviation ORANGE). Shishaldin remained in unrest (Advisory / Aviation YELLOW).
Indonesia
Explosive activity was notable at Ibu (102 explosions; ash to 800 m) and Semeru (108 explosions). Lewotolok recorded 191 explosions with only very low ash near the vent, while Dukono and Marapi produced modest ash plumes. Slope instability and degassing persisted at Merapi, with 111 rockfalls. Unrest continued at Iliwerung, Kerinci, and Raung. Lewotobi remained at an elevated alert, and gas rose about 100 m at Karangetang.
Japan
Yakedake showed increased unrest; a Level 2 restriction remained in place near the crater.
Philippines
Mayon maintained dome growth with active lava effusion and minor Strombolian bursts. Seismic monitoring tallied numerous rockfalls and events linked to pyroclastic density currents, and a persistent crater glow was visible.
Mexico
Popocatepetl emitted gas and steam, and a M1.1 volcano-tectonic quake was recorded; the alert stayed at Yellow Phase 2.
South America
In Ecuador, Sangay produced 297 explosions with ash rising to 1.5 km, while Reventador generated 36 blasts and ash to 1 km. Peru’s Sabancaya increased, with three explosions sending plumes to 2.5 km and a thermal anomaly detected.
Other
Guatemala’s Fuego was highly explosive at times, with up to 10 explosions per hour, incandescent ejections to 300 m, and ash plumes near 1 km. In Costa Rica, Poas remained in eruption (Level 2 – Warning; Aviation Yellow), while Rincon de la Vieja and Turrialba stayed at Level 2 – Warning.
Source: Smithsonian/USGS GVP Daily Volcanic Activity Report (26 January 2026).
Activity Summary for 26 January 2026
| Volcano | Country | Activity Type | Keynotes |
|---|---|---|---|
| Dukono | Indonesia | Eruption | Ash-and-gas plumes to 500 m; low-level eruptive activity. |
| Fuego | Guatemala | Eruption | ~10 explosions/hour; incandescence to 300 m; ash plumes to ~1 km. |
| Great Sitkin | United States | Eruption | Eruption ongoing; Watch / Aviation ORANGE. |
| Ibu | Indonesia | Eruption | 102 explosions; ash plumes to 800 m; ongoing eruption. |
| Kilauea | United States | Eruption | Eruption ongoing; Watch / Aviation ORANGE. |
| Lewotolok | Indonesia | Eruption | 191 explosions; very low ash plume (~10 m); eruption ongoing. |
| Marapi | Indonesia | Eruption | Single explosion; ash plume to 600 m. |
| Mayon | Philippines | Eruption | Lava effusion and minor Strombolian bursts; numerous rockfalls and PDC-related quakes; crater glow. |
| Merapi | Indonesia | Eruption | 111 rockfalls; gas plume ~10 m; ongoing dome activity. |
| Popocatepetl | Mexico | Eruption | Gas-and-steam emissions; M1.1 volcano-tectonic quake. |
| Poas | Costa Rica | Eruption | Eruption ongoing; Level 2 – Warning; Aviation Yellow. |
| Reventador | Ecuador | Eruption | 36 explosions; ash plumes to 1,000 m; eruption ongoing. |
| Sabancaya | Peru | Eruption – increased | 3 explosions; ash plumes to 2.5 km; thermal anomalies and volcanic quakes. |
| Sangay | Ecuador | Eruption | 297 explosions; ash plumes to 1.5 km; thermal anomalies. |
| Semeru | Indonesia | Eruption | 108 explosions; 5 rockfalls; eruption ongoing. |
| Iliwerung | Indonesia | Unrest | Ongoing unrest; Alert Level 2 – Alert. |
| Karangetang | Indonesia | Unrest | Gas-and-steam plume to 100 m; unrest. |
| Kerinci | Indonesia | Unrest | Ongoing unrest; Alert Level 2 – Alert. |
| Lewotobi | Indonesia | Unrest | Ongoing unrest; Level 3 – Standby. |
| Raung | Indonesia | Unrest | Ongoing unrest; Alert Level 2 – Alert. |
| Rincon de la Vieja | Costa Rica | Unrest | Ongoing unrest; Level 2 – Warning; Aviation Yellow. |
| Shishaldin | United States | Unrest | Ongoing unrest; Advisory / Aviation YELLOW. |
| Turrialba | Costa Rica | Unrest | Ongoing unrest; Level 2 – Warning. |
| Yakedake | Japan | Unrest – increased | Unrest increased; Level 2 – restriction near crater. |