Estimation of P-Waves Using Vertical and Small Aperture Horizontal Arrays
TELEDYNE GEOTECH ALEXANDRIA VA SEISMIC DATA LAB
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In estimating signals as P-waves, without regard to distinguishing the P-waves in ambient noise from those which are added by a teleseismic signal, the comparative performance of a thirteen element small aperture horizontal array and a seven element vertical array favors the vertical array. Analysis of the variance of the residual noise under the estimate of signal on the vertical array results in a signal estimation error which is 31 db down on the vertical array estimate of signal, and 15 db down on the horizontal array. Some preliminary indications, using the estimate of signal on the horizontal array to compute residuals on the horizontal array and using estimates of signal on the vertical array to compute residuals on the vertical array, are 31 db on the vertical array and 23 db on the horizontal array. Most of this difference in the two arrays is in the low frequency noise less than 0.8 Hz as band pass filtering tends to remove the difference in estimation error between the two arrays.
- Seismic Detection and Detectors