Sydney, Australia Inaudible sonic rumblings from deep in a volcano’s bowels could provide a warning when it is about to blow, scientists said Thursday, offering threatened communities the prospect of a life-saving heads-up. A team studying “infrasounds” — sounds too deep for humans to hear — from volcanoes like Italy’s Mount Etna has discovered that magmatic gurgles change markedly as an eruption nears. As magma explodes, soundwaves reverberate through the crater “just […]