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amplitudes are computed by subtracting predicted pressures from the observations, in which the predictions closely match the tides and lower frequency fluctuations.Thepredictions are updated every seconds, which is the sampling interval of the DART gages.Background oceanic noise determines the minimum detection threshold.Based on past observations, a reasonable threshold for the North Pacific is cm or mm.If the amplitudes exceed the threshold, the gage goes into a rapid reporting mode to provide detailed information about the tsunami.It remains in this mode for at least four hours
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