Abstract
Abstract : This report discusses the use of multichannel filters designed from local signal and local noise in order to overcome the problem of gain inequalization. Included in this study is an analysis of the filtered outputs of several teleseisms and quarry blasts in order to determine whether the signal rejection noted in a previously developed filter was due to gain inequalities. Also included is an investigation of the use of various array geometries in the design of multichannel filters. From this study, it can be concluded that: use of local signal and noise in the design of signal-extraction multichannel filters is an effective technique for overcoming gain inequalities while preserving signal and rejecting a reasonable amount of noise; a comparison of the outputs of local noise filter MCF A1 and IP 9 indicates that IP 9 exhibits excessive gain attenuation for teleseismic signals, which could be caused by either gain inequalities in the noise model or by an insufficient amount of gain variation added to the signal model; variations in the design signal-to-noise (S/N) ratios produces no significant gain in S/N improvement; and filters designed using different array geometries show only slight variations in their final output.
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