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Mayon lava flows extend kilometers as Great Sitkin dome grows; Kilauea paused

Explosive activity and lava effusion stood out across multiple arcs today. In the Philippines, Mayon sustained multi-kilometer lava flows with frequent rockfalls and occasional PDC signals, while nearby Kanlaon produced ash up to 1.5 km and high SO2 output. In Alaska, Great Sitkin's dome kept growing with rockfalls as Kilauea stayed paused but glowing with small quakes.

United States
great sitkin (great-sitkin/news.html) (Watch / Aviation ORANGE) showed slightly elevated thermal signals as lava continued to slowly fill the summit crater, generating rockfalls.
kilauea (kilauea/news.html) (Advisory / Aviation YELLOW) remained in a pause with a gas plume, persistent glow at the north and south vents, and 29 small summit earthquakes.
shishaldin (shishaldin/news.html) (Advisory / Aviation YELLOW) exhibited SO2 degassing and ongoing unrest.

Indonesia
Ash-rich explosions were logged at dukono (dukono/news.html) (87; plumes to 1.4 km), Ibu (112; to 800 m), and semeru (semeru/news.html) (60; to 1.2 km).
merapi (merapi/news.html) produced hot avalanches reaching 2 km and over a hundred rockfalls; minor ash or gas rose a few hundred meters at Marapi and Lewotolok.
Unrest featured gas-and-steam plumes at Gamalama, Karangetang, and Kerinci.
Status updates were brief at krakatau (krakatau/news.html) and Lewotobi, both at Level 2.

Philippines
At mayon (mayon/news.html) (Alert Level 3), lava continued to effuse into the Basud, Bonga, and Mi-isi gullies with flows 3.8 km, 3.2 km, and 1.6 km long; frequent rockfalls and a few PDC-related signals were recorded, and plumes rose to 1 km.
kanlaon (canlaon/news.html) produced five ash emissions to 1.5 km, averaged about 3,000 t/d SO2, and showed inflation and tremor (Alert Level 2).
Elsewhere, Taal generated plumes with mild inflation and low-level seismicity, and Bulusan showed shallow unrest with small plumes and quakes (both at Alert Level 1).

Mexico
popocatepetl (popocatepetl/news.html) (Yellow Alert - Phase 2) emitted ash, gas, and steam; a M1.4 VT earthquake was recorded.

South America
In Ecuador, reventador (reventador/news.html) produced 104 explosions with ash to 800 m and incandescent rockfalls to 1 km, while Sangay registered 165 explosions.
Peru's sabancaya (sabancaya/news.html) sent ash-gas plumes up to 700 m and recorded 11 internal earthquakes.

Other
In Guatemala, fuego (fuego/news.html) generated explosions with ash to about 700 m, audible shockwaves, and incandescent avalanches; santa maria (santiaguito/news.html) produced up to four explosions per hour, short ash plumes, and glowing rockfalls.
In Costa Rica, activity remained at Level 2 at Poas, Rincon de la Vieja, and Turrialba.

Source: smithsonian/usgs gvp daily volcanic activity report (https://volcano.si.edu/reports_daily.cfm?activitydate=2026-05-04) (4 May 2026).

Activity Summary for 4 May 2026

VolcanoCountryActivity TypeKeynotesdukono (dukono/news.html)IndonesiaEruption87 explosions; ash plumes to 1.4 km...

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Mayon lava flows extend kilometers as Great Sitkin dome grows; Kilauea paused

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