Extinct Volcanoes Hide Magma

A new reconstruction of the Methana volcano suggests volcanoes classified as 'extinct' (silence >10,000 years) can nonetheless accumulate water‑rich magma during long slumbers and later reawaken. That means current time‑based labels may understate hazard and leave many population centers without monitoring. — If many 'extinct' volcanoes can re‑charge unnoticed, hazard definitions, monitoring priorities, and land‑use planning need revision to protect people living near supposedly dead volcanic systems.