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vulcanian
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Definitions of vulcanian in various dictionaries:
Of, relating to, or originating from an explosive volcanic eruption.
Of or relating to metalworking or craft.
VULCANIAN - The term vulcanian was first used by Giuseppe Mercalli, witnessing the 18881890 eruptions on the island of Vulcano. His description of the eruption s...
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| Vulcanian description |
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| The term vulcanian was first used by Giuseppe Mercalli, witnessing the 18881890 eruptions on the island of Vulcano. His description of the eruption style is now used all over the world for eruptions characterised by a dense cloud of ash-laden gas exploding from the crater and rising high above the peak. Mercalli described vulcanian eruptions as "...Explosions like cannon fire at irregular intervals..." Their explosive nature is due to increased silica content of the magma. Almost all types of magma can be involved, but magma with about 55% or more silica (e.g. basaltic andesite) is most common. Increasing silica levels increase the viscosity of the magma which means increased explosiveness. They usually commence with phreatomagmatic eruptions which can be extremely noisy due the rising magma heating water in the ground. This is usually followed by the explosive clearing of the vent and the eruption column is dirty grey to black as old weathered rocks are blasted out of the vent. As th |