Strombolian activity at Mount Etna’s Southeast Crater evolved into lava fountaining on April 30, 2025, producing ash emissions and prompting a temporary elevation of the Aviation Color Code to Red. This was the 11th eruptive episode at Etna since March 15.
A phreatic eruption occurred at Bulusan volcano, Philippines, on April 28, 2025, generating a 4.5 km (1 650 feet) high ash plume and resulting in ashfall over nearby communities. The Philippine Institute of Volcanology and Seismology raised the Alert Level to 1.
A Red Alert was issued for Poás Volcano National Park in Costa Rica on Wednesday, April 23, 2025, after a series of eruptions produced ash plumes reaching up to 4 500 m (15 000 feet) above the crater. Ashfall was reported in several surrounding areas, prompting Orange Alerts in Grecia and Sarchí, and Yellow Alerts in Alajuela, Poás, Naranjo, Río Cuarto, and Zarcero due to increased volcanic hazards.
A strong explosive eruption took place at the Bezymianny volcano in Kamchatka, Russia, on April 23, 2025, sending an ash plume 11 km (36 000 feet) above sea level. As a result, the Aviation Color Code was raised to Red.
New activity/unrest was reported for 6 volcanoes from April 16–22, 2025. During the same period, ongoing activity was reported for 16 volcanoes.
Volcanic ash has been increasingly detected in the steam and gas plume at White Island volcano, New Zealand, over the past few months, prompting authorities to raise the Volcanic Alert Level to 3 on April 17, 2025. Intermittent explosive activity observed during aerial monitoring supports the assessment of elevated volcanic unrest.
New activity/unrest was reported for 3 volcanoes from April 9 to 15, 2025. During the same period, ongoing activity was reported for 20 volcanoes.
An extrusive-effusive eruption at Bezymianny volcano in Kamchatka, Russia, intensified on April 11, 2025, producing pyroclastic flows on the eastern slopes and ash plumes reaching 3–4 km (9 800–13 100 feet) above sea level. Current data suggests the volcano is preparing for a strong explosive eruption.
New activity/unrest was reported for 4 volcanoes from April 2 to 8, 2025. During the same period, ongoing activity was reported for 23 volcanoes.
An explosive eruption at Kanlaon Volcano in the Philippines on April 8, 2025, produced a 4 000 m (13 000 feet) high ash plume, pyroclastic flows, and ballistic fragments. Authorities have urged communities within 6 km (3.7 miles) of the summit crater to remain evacuated.
