Scientists studying Mount Etna have found that changes in the “b-value” ratio of earthquakes can signal magma movement before eruptions. Using nearly 20 years of data, this discovery could enhance volcanic early warning systems globally, potentially saving lives in regions near active volcanoes.Scientists studying Mount Etna have found that changes in the “b-value” ratio of earthquakes can signal magma movement before eruptions. Using nearly 20 years of data, this discovery could enhance volcanic early warning systems globally, potentially saving lives in regions near active volcanoes.