After North Korea’s latest nuclear test, scientists are worried that more underground explosions in the isolated country’s rocky north could set the stage for a deadly volcanic eruption not unlike the one that NASA fears could be brewing in the Yellowstone caldera. Following the North’s sixth nuclear test Chinese authorities have stepped up radiation monitoring and even closed part of their... 

On the verge of a catastrophe? Yellowstone National Park's caldera has erupted three times in the last 2.1 million years and scientists monitoring it say we could be in for another eruption. The super-volcano beneath Yellowstone National Park in Wyoming has been rising at a record rate since 2004. It would explode with a force a thousand times more powerful than the Mount St Helens eruption in...