An eruption at Taal Volcano in 2025. Credit: PHIVOLCS

Two weeks ago, the Philippine Institute of Volcanology and Seismology recorded three distinct, short-lived explosions in less than five minutes at Taal Volcano. The eruption sent a column of ash and steam up to 1.2 km (0.75 miles) into the air.

Despite this, it caused little disruption. The volcano remains at Alert Level 1, or "low-level unrest," with a smaller eruption logged over the weekend.

Yet even small eruptions like these can reveal important clues about how volcanoes behave and why scientists closely monitor even relatively minor volcanic rumbling.

A history of big eruptions