A Burp or a Blast? Seismic Signals Reveal the Volcanic Eruption to Come

Last December, a gloopy ooze of lava began extruding out of the summit of La Soufrière, a volcano on the Caribbean island of St. Vincent. The effusion was slow at first; no one was threatened. Then in late March and early April, the volcano began to emit seismic waves associated with swiftly rising magma. Noxious fumes vigorously vented from the peak. Fearing a magmatic bomb was imminent…

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