'Extinct' Volcanoes May Be Silently Building Magma For Future Eruptions

ETH Zurich researchers say Greece’s Methana volcano was likely still accumulating magma during a quiet period of more than 100,000 years.

A surge in zircon crystal formation suggests the system remained active underground even without surface eruptions.

The findings challenge the idea that long-dormant volcanoes are extinct.

That could change eruption forecasting and hazard assessments for communities near dormant volcanic systems, including in the South Aegean Volcanic Arc.