Extraction of Long-Period Surface Waves
TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
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Gains from a cascaded Wiener filter, three component adaptive TCA filter, and prewhitened matched filter were measured for various orders of application to long-period surface waves buried in seismic noise. It was found that the gain of the cascaded Wiener filter and three component adaptive filter was greater than the sum of their individual gains, and that this was the best order of application, but that following them with the matched filter reduced the overall gain over the range of input signal to noise ratio of interest. These results are due to the non-linear nature of the TCA and to the distortion inherent in its output.
- Seismic Detection and Detectors