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The
NeMO Net Bottom Pressure Recorder (BPR) is located near the center of
Axial caldera at the summit of the volcano. BPRs precisely measure the
pressure from the overlying ocean, and by doing so they can detect vertical
movements of the seafloor due to volcanic activity (for example, if the
seafloor were uplifted the BPR would measure a pressure decrease). The
NeMO Net BPR sends back four pressure measurements per hour from the seafloor
(purple,in the plots below). After
the predictable variations from ocean tides (black
curve) are removed, the de-tided BPR data (red)
is then evaluated to look for any sudden vertical movements of the seafloor
that may signal the onset of a volcanic eruption.
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