An underwater volcano gave off clear signals well before its outburst last year that it would erupt.
The researchers used pressure sensors on the seafloor to monitor its vertical motions. "Uplift of the seafloor has been gradual and steady beginning in about 2000, two years after it last erupted," Chadwick said. "But the rate of inflation from magma went from gradual to rapid about four to five months before the eruption. It expanded at roughly triple the rate, giving a clue that the next eruption was coming."
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