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  • Supervolcanoes likely triggered externally, study finds

    Supervolcanoes are likely triggered externally, when the rock around them cracks or collapses, according to a study led by Illinois geologist Patricia Gregg.

    Supervolcanoes are likely triggered externally when the rock around them cracks or collapses, according to a study led by Illinois geologist Patricia Gregg.

    Photo by L. Brian Stauffer

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  • Editor’s notes: To reach Trish Gregg, call 217-333-3540; email pgregg@illinois.edu. The paper “Catastrophic caldera-forming eruptions II: The subordinate role of magma buoyancy as an eruption trigger” is available online.