Doomsday 2012 scenarios include the eruption of supervolcano, but NASA said its geological records holds no clues that such supereruptions have happened during the Earth's 4.5 billion-year lifetime.

According to NASA, scientists have no way of predicting with perfect accuracy whether a supervolcano will occur in a given century, decade, or year but they keep close tabs on volcanically active areas around the world and they have not found any sign of a supereruption looming anytime soon.

Geologists have used the term "supervolcanoes" or a "supereruptions" to refer to explosive volcanic eruptions that eject about 10,000 times the quantity of magma and ash that was expelled by Mount St. Helens, one of the most explosive eruptions in recent years.

Scientists said that the Earth's surface has preserved clues of massive supereruptions like expansive layer of ash covering large portions of many continents and huge hollowed-out calderas which can be seen in past supereruptions like what happened in Indonesia, New Zealand, the United States and Chile.

NASA said that while scientists agree that the supereruptions really occur, they are exceedingly rare. The most recent supereruptions include the one which occurred 26,000 years ago in New Zealand, and the cataclysmic eruption of Mount Toba 50,000 years earlier.

According to NASA, geologist have identified the remnant of about 50 supereruptions, but after calculating the approximate frequency of eruptions, it was found that only 1.4 supereruptions occur every one million years.