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    Magma wagging and whirling : excitation by gas flux

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    ggy313.pdf (2.396Mb)
    Date
    2018-07-28
    Author
    Liao, Yang  Concept link
    Bercovici, David  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/10696
    As published
    https://doi.org/10.1093/gji/ggy313
    DOI
    10.1093/gji/ggy313
    Keyword
     Physics of magma and magma bodies; Volcano seismology; Volcanic gases 
    Abstract
    Gas flux in volcanic conduits is often associated with long-period oscillations known as seismic tremor (Lesage et al.; Nadeau et al.). In this study, we revisit and extend the ‘magma wagging’and ‘whirling’models for seismic tremor, in order to explore the effects of gas flux on the motion of a magma column surrounded by a permeable vesicular annulus (Jellinek & Bercovici; Bercovici et al.; Liao et al.). We find that gas flux flowing through the annulus leads to a Bernoulli effect, which causes waves on the magma column to become unstable and grow. Specifically, the Bernoulli effects are associated with torques and forces acting on the magma column, increasing its angular momentum and energy. As the displacement of the magma column becomes large due to the Bernoulli effect, frictional drag on the conduit wall decelerates the motions of the column, restoring them to small amplitude. Together, the Bernoulli effect and the damping effect contribute to a self-sustained wagging-and-whirling mechanism that help explain the longevity of long-period seismic tremor.
    Description
    Author Posting. © The Authors, 2018. This article is posted here by permission of The Royal Astronomical Society for personal use, not for redistribution. The definitive version was published in Geophysical Journal International 215 (2018): 713–735, doi:10.1093/gji/ggy313.
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    • Geology and Geophysics (G&G)
    Suggested Citation
    Geophysical Journal International 215 (2018): 713–735
     

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