Cause of supervolcano eruption 73,000 years ago found
International researchers have decoded what triggered the eruption of Indonesian supervolcano Toba about 73,000 years ago, considered as one of the largest eruptions witnessed by mankind. Scientists found that quartz crystals that grow in the magma, register chemical and thermodynamical changes in the magmatic system prior to eruption, characterised by change of composition of oxygen's isotopes.