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Supervolcanoes triggered by external mechanism
Supervolcanoes with massive eruptions with potential global consequences become active when the roof above them cracks or collapses, not because of internal pressure building, suggests new research.
New York: Supervolcanoes with massive eruptions with potential global consequences become active when the roof above them cracks or collapses, not because of internal pressure building, suggests new research.
Knowledge of triggering mechanisms is crucial for monitoring supervolcano systems, including ones that lie beneath Yellowstone National Park and Long Valley, California, US, the researchers pointed out. Considered five hundred times larger than a typical volcanoe, a supervolcano is classed as more than 500 cubic kilometres of erupted magma volume.
According to the new model that the researchers developed, if a crack or fault in the roof penetrates the magma chamber, the magma uses the crack as a vent to shoot to the surface. This could trigger a chain reaction that "unzips" the whole supervolcano.
