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An array of standard long period stations is applied to measure phase velocities of seismic surface waves by way of frequency‐wavenumber analysis. The number of interfering modes is reduced by windowing the signal for successive group velocity intervals. The method is powerful, even with relatively small arrays: up to 6 higher Rayleigh modes at periods between 20 and 100 sec. have been resolved.
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Guust Nolet (1975) studied this question.
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