A new model for volcanic tremor has a magma column, surrounded by gas bubbles, oscillating or 'wagging' back and forth. The model reconciles several observations of this characteristic signal. See Letter p.522
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McNutt, S. Volcanic tremor wags on. Nature 470, 471–472 (2011). https://doi.org/10.1038/470471a
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DOI: https://doi.org/10.1038/470471a
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