Abstract
At an active volcano, long-period seismicity (with typical periods
in the range 0.2-2 s) reflects pressure fluctuations resulting from
unsteady mass transport in the sub-surface plumbing system, and hence
provides a glimpse of the internal dynamics of the volcanic edifice.
When this activity occurs at shallow depths, it may signal the pressure-induced
disruption of the steam-dominated region of the volcano, and can
accordingly be a useful indicator of impending eruption.
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