The La Garita eruption was over 10,000 times as violent as Mt. St. Helens… La Garita blew out 1,500 cubic miles of rock and ash, nearly three times the amount from Yellowstone…
Mauna Loa, which means long mountain in Hawaiian, is the largest active volcano in the world. It covers 2,035 sq miles (5,271 sq km), and is one of a chain of five volcanoes which form Hawaii's Big Island. This one volcano alone comprises half of the whole island.
The last such eruption at Popocatepetl was around A.D. 800. The eruption destroyed nearby settlements and culminated in mudflows that blanketed the Puebla Valley. An eruption of this magnitude today would endanger hundreds of thousands of lives.
Yellowstone Supervolcano (Wyoming, United States) Effects of a major eruption: When the Yellowstone Caldera, or supervolcano, in Yellowstone National Park erupts again, its effects would be worldwide, the U.S. Geographical Survey said.
As pressure is released, gases dissolved in the magma come out of solution, turning the magma into a boiling froth. The total energy released would be equivalent to an 875,000 megaton explosion. The shockwave would kill 90,000 people. Most of the lava would fall back into the crater.
No, Mount Fuji is not a supervolcano, which is simply a volcano that has erupted with an explosivity index of at least 8. An eruption of this size has not occurred in recorded history, likely last occurring in New Zealand about 26,000 years ago.
The Yellowstone supervolcano last erupted about 640,000 years ago. A sleeping giant is nestled in the western part of the United States. Though it stirs occasionally, it has not risen from slumber in nearly 70,000 years.