Long-Period Signal Separation Experiments
TEXAS INSTRUMENTS INC DALLAS SERVICES GROUP
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The problem of separating Rayleigh waves from two distinct epicenters received simultaneously was studied. The relations between the target-to- interfering-event TTIE ratio and interfering event suppression as well as target event extraction in MCF design were examined. Using the vertical components of the array, the results show that interfering event suppression increases as TTIE ratio increases. For the data recorded at LASA using a 5- channel 21-point MCF designed with a TTIE ratio equal to -10 db and -40 db, the interfering event was suppressed by 15.5 db and 22.0 db, respectively. There was no significant signal distortion. The coherence between the vertical and horizontal traces of an individual site was examined, using two UBO samples. Utilizing a 2-channel, 43-point prediction filter, prediction errors of -9.1 db and -16.4 db, respectively, are shown in the results.
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