Is age the key to how big volcanoes will blow?
Volcanic activity is difficult to predict, even when it is closely monitored. But researchers now believe a crater's age might offer clues, with older volcanoes producing less frequent but larger and more dangerous eruptions. They gave the example of Mount St. Helens in the US, which became active 40,000 years ago but its last eruption in 2008 was small and not deadly. On the contrary, the ancient Mount Toba in Indonesia began erupting about 1.2 million years ago and its last eruption 74,000 years ago was cataclysmic.
Source: dailymail.co.uk