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The dominant periods of travel times in the bulletins are poorly documented and vary among stations, but are commonly obtained from instruments that are sensitive to a narrow band of frequencies around 1 Hz.
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Morgan, W.J.1
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55
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0346953034
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note
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-3, and a rise velocity of 1 cm/year, we obtain an advective heat flux of 9.8 TW. The estimate scales linearly with the assumed rise velocity. Smoothing does not influence the flux itself, but may underestimate the area confined by the -0.5% isosurface, so this is a conservative estimate that could easily be larger. Imposing a different limit (e.g., 0.7% or 140 K) brings the flux down to 3.1 TW for 1 cm/year.
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note
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We thank J. Morgan for numerous discussions and helpful suggestions. Supported by NSF grants EAR-9814570 and EAR-0105387.
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