Central America and the Philippines stood out today with ashfall, lava effusion, and dome-related rockfalls, while several U.S. volcanoes held steady at elevated aviation alerts. Highlights include ashfall around Fuego, ongoing blocky lava effusion and occasional short-run pyroclastic flows at Santa Maria, and persistent lava effusion and high gas output at Mayon. Kilauea and Great Sitkin remained at Watch / Aviation ORANGE, and compared to yesterday Sabancaya’s classification shifted from “increased activity” to a continuing eruption.
United States
Great Sitkin (Watch / Aviation ORANGE) kept lava slowly erupting in the summit crater with rockfalls detected on seismic instruments.
Kilauea (Watch / Aviation ORANGE) stayed in eruption with no new details noted.
Farther west, Shishaldin (Advisory / Aviation YELLOW) produced vapor plumes alongside a weak thermal signal.
Indonesia
Halmahera’s Ibu and Dukono generated frequent explosions with low plumes (up to roughly 0.8–1.2 km above the vents).
On Java and nearby arcs, Semeru and Merapi showed numerous explosions and rockfalls, while Lewotolok logged over a hundred blasts with ash-gas plumes to a few hundred meters.
Unrest persisted at several others across Sulawesi, the Sunda arc, and Flores; most are at Level 2 – Alert, while Tangkuban Parahu remained at Level 1 – Normal.
Japan
Yakedake showed renewed summit-directed uplift on tiltmeters and ongoing fumarolic activity; the alert stayed at Level 2, restricting access near the crater.
An aerial survey noted no change in the main fumarole fields compared with last year’s observations.
Philippines
Mayon (Alert Level 3) continued lava effusion with minor Strombolian bursts and frequent rockfalls; instruments recorded numerous PDC-related signals and elevated SO2.
Kanlaon (Alert Level 2) produced plumes to 350 m, while Taal (Alert Level 1) emitted plumes to 500 m with a brief tremor episode.
Mexico
Popocatepetl released gas-and-vapor plumes and remained at Yellow Alert – Phase 2.
South America
Ecuador’s Reventador produced dozens of explosions with ash-gas plumes to about 1 km and thermal anomalies, and Sangay generated around 300 explosions with night glow.
In Peru, Sabancaya sent an ash–gas–steam plume to roughly 1.4 km above the crater amid volcanic earthquakes and a thermal anomaly.
Other
In Guatemala, Fuego produced up to 10 explosions per hour with ashfall in multiple communities, while Santa Maria continued blocky lava effusion at the Caliente dome with occasional short-run pyroclastic flows.
Nearby Pacaya exhibited fumarolic activity.
In Costa Rica, Poas stayed at Level 2 – Warning (Aviation Yellow), with Rincon de la Vieja and Turrialba also at Level 2 – Warning.
Source: Smithsonian/USGS GVP Daily Volcanic Activity Report — 27 January 2026.
Activity Summary for 27 January 2026
| Volcano | Country | Activity Type | Keynotes |
|---|---|---|---|
| Dukono | Indonesia | Eruption | 1 explosion; plumes to 1.2 km above vent. |
| Fuego | Guatemala | Eruption | Up to 10 explosions/hr; plumes to 737 m; ashfall in nearby communities. |
| Great Sitkin | United States | Eruption | Lava slowly erupting in summit crater; rockfalls detected. |
| Ibu | Indonesia | Eruption | 81 explosions; ash-gas plumes to 800 m. |
| Kilauea | United States | Eruption | Eruption ongoing; Watch / Aviation ORANGE. |
| Kanlaon | Philippines | Eruption | Plumes to 350 m; ongoing eruption. |
| Lewotolok | Indonesia | Eruption | 102 explosions; ash-gas plumes to 200 m. |
| Marapi | Indonesia | Eruption | Eruption ongoing; Alert Level 2 – Alert. |
| Mayon | Philippines | Eruption | Lava effusion with minor Strombolian bursts; frequent rockfalls and PDC signals; SO2 at 3,364 t/d. |
| Merapi | Indonesia | Eruption | Hot rockfalls to 1.7 km; 1 PDC; 113 rockfalls. |
| Popocatepetl | Mexico | Eruption | Gas-and-vapor plumes; ongoing eruption. |
| Poas | Costa Rica | Eruption | Eruption ongoing; Level 2 – Warning; Aviation Yellow. |
| Reventador | Ecuador | Eruption | 68 explosions; ash-gas plumes to 1 km; thermal anomalies. |
| Sabancaya | Peru | Eruption | Ash-gas-steam plume to 1.4 km; volcanic quakes; thermal anomalies. |
| Sangay | Ecuador | Eruption | 300 explosions; ash-gas plumes to 1 km; night glow and SO2 degassing. |
| Santa Maria | Guatemala | Eruption | Blocky lava effusion at Caliente dome; explosions with ash and short-run PDCs; ashfall reported. |
| Semeru | Indonesia | Eruption | 97 explosions; rockfalls; felt seismicity. |
| Taal | Philippines | Eruption | Plumes to 500 m; brief tremor episode (7 min). |
| Awu | Indonesia | Unrest | Gas-and-vapor plumes to 50 m; ongoing unrest. |
| Bur ni Telong | Indonesia | Unrest | Ongoing unrest; Alert Level 2 – Alert. |
| Iliwerung | Indonesia | Unrest | Ongoing unrest; Alert Level 2 – Alert. |
| Karangetang | Indonesia | Unrest | Gas-and-vapor plumes to 100 m; ongoing unrest. |
| Kerinci | Indonesia | Unrest | Ongoing unrest; Alert Level 2 – Alert. |
| Lewotobi | Indonesia | Unrest | Gas-and-vapor plumes to 100 m; ongoing unrest. |
| Lokon-Empung | Indonesia | Unrest | Gas-and-vapor plumes to 25 m; ongoing unrest. |
| Pacaya | Guatemala | Unrest | Fumarolic activity; ongoing unrest. |
| Raung | Indonesia | Unrest | Ongoing unrest; Alert Level 2 – Alert. |
| Rincon de la Vieja | Costa Rica | Unrest | Ongoing unrest; Level 2 – Warning; Aviation Yellow. |
| Sangeang Api | Indonesia | Unrest | Ongoing unrest; Alert Level 2 – Alert. |
| Shishaldin | United States | Unrest | Vapor plumes; thermal anomalies. |
| Soputan | Indonesia | Unrest | Gas-and-vapor plumes to 30 m; ongoing unrest. |
| Turrialba | Costa Rica | Unrest | Ongoing unrest; Level 2 – Warning. |
| Yakedake | Japan | Unrest | Fumarolic activity at multiple vents; summit-directed uplift detected. |
| Tangkuban Parahu | Indonesia | Background | Background activity; Alert Level 1 – Normal. |