Coherence and Power Spectral Density

An algorithm "scn_psd" to calculate the signal Power Spectral Density (PSD), the noise PSD and the coherence between sensors has been developed as a tool for quantifying the performance differences between the seismic sensors under test. Two sample results of the algorithm are shown. Figure 3.27 shows the results for four seismometers in the case of a large seismic event and Figure 3.28 shows the results for four seismometers in the case of background noise.

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