According to the CVO, three volcanoes in California are even more dangerous than the volcanoes in Hawaii because they are “blast volcanoes”, which are more destructive.
Dr. Margaret Mangan, who runs the CVO, added: “California is not only earthquake country, it's volcano country too.”
Dr Brian Hausback, a US geologist, told CBS: “If one of these volcanoes decides to erupt, it will catch the world’s attention.
“These areas have high populations, infrastructure like power plants, and high level of air traffic in the area.
“There is no stopping a volcanic eruption. It is very likely that one of them will erupt in the near future, it is due.”