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Magma can speed to the surface, powering volcanoes

Fast ascent of molten rock could foretell future eruptions

1:14pm, July 31, 2013

MAGMA HIGHWAY  Samples gathered from the inner slopes of the main crater of the Irazú volcano (shown) reveal that its 1963–65  eruption was fueled in part by young magma fresh from Earth's mantle.

Molten magma can cruise at high speeds from deep in the Earth to the surface, triggering volcanic eruptions. The discovery suggests that advance warning of an eruption might come from monitoring seismic action deeper in the crust than scientists usually look.

The new analysis, published in the Aug. 1 Nature, looked at the distribution of minerals and elements in ash from the 1963–65 eruption of Costa Rica’s Irazú volcano. When scientists Philipp Ruprecht and Terry Plank of Columbia University’s Lamont-Doherty Earth Observatory examined tiny crystals of the mineral olivine, they saw much more nickel than the researchers expected. That suggests that some

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