Signal Detection
Signal Detection : The detection of weak signals imposed upon noise can be accomplished by noting significant changes in amplitude, frequency content, polarization direction, signal shape, or wave propagation characteristics (backazimuth and slowness). If the signal to be detected has a waveform or a horizontal wavepropagation velocity that is known beforehand, for example, from a prior event in the same location and recorded at the same station, then correlation methods, matched filtering or velocity filtering can be applied for detection. See Chapter 9 and Section 4.4 in Chapter 4 of this Manual; also Richards (2002)
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