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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.
Number of deaths due to the world's major volcanic eruptions from 1900 to 2015*. The statistic presents the death toll in individual countries due to the world's major volcanic eruptions from 1900 to 2015*. The volcanic eruption in Cameroon on August 24, 1986 claimed a total of 1,746 deaths.Volcanic eruptions.A volcanic eruption is defined as a discharge of lava and gas from a volcanic vent or fissure. Volcanoes spew hot, dangerous gases, ash, lava, and rock that are powerfully destructive.he volcanic eruption in Cameroon on August 24, 1986 claimed a total of 1,746 deaths. Volcanic eruptions. A volcanic eruption is defined as a discharge of lava and gas from a volcanic vent or fissure. Volcanoes spew hot, dangerous gases, ash, lava, and rock that are powerfully destructive.