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Volcanic eruptions are caused when magma from the magma chamber of the Earth rises up the pipe and out of the vent.Magma is continuously supplied from the mantle of the Earth. Shield volcanoes usually have a gentle eruption, as it contains basic lava.nother type of eruption in what is known as a boiler volcano results from water that gets trapped inside porous rock, and is then heated by the mantle, until is turns into steam and the steam pressure causes the volcano to explode. These explosions can be extremely large.
80% of the world's active volcanoes are found occur along destructive boundaries. Aci â¦ d-lava and composite volcanoes also cause the most violent eruptions as the lava is viscous and the opening of the volcano is sometimes blocked by hardened lava, causing a huge massive explosion during the eruption.cientist believe the most powerful volcanic eruption occurred approximately 2 million years ago when the Yellowstone Caldera erupted. It produced an eruption 2500 times more â¦ powerful than the May 1980 Mt. St. Helens eruption. The two most destructive volcanoes in the past 200 years are located in Indonesia.