. Collected reprints, Essa Institute for Oceanography. Oceanography 180° <D -180° <D O d £ frequency (cps) frequency (cps) Fig. 4. Plot showing power spectrum, coherence, and phase-change for two of the seismic stations. The moving cross-correlation technique yielded the most accurate and consistent time delays between station pairs. A data window was applied to each section of the time series. The cross correlation is given by Li TO i=\ Ui+j Vi â I, -1,0,1, â¢â¢ I where: Lj is the cross correlation Wj is a weighting function Ui and iu are the series being cross-
. Collected reprints, Essa Institute for Oceanography. Oceanography 180° <D -180° <D O d £ frequency (cps) frequency (cps) Fig. 4. Plot showing power spectrum, coherence, and phase-change for two of the seismic stations. The moving cross-correlation technique yielded the most accurate and consistent time delays between station pairs. A data window was applied to each section of the time series. The cross correlation is given by Li TO i=\ Ui+j Vi â I, -1,0,1, â¢â¢ I where: Lj is the cross correlation Wj is a weighting function Ui and iu are the series being cross-correlated m is the number of terms in «,- and yt- and I is the maximum number of lags. For each station pair, the maximum positive peaks in the cross-correlation were accepted as the representative maximum correlation. Series segments of various lengths were used which included at least the first five to six cycles after the onset of initial P-motion. Figure 5 shows the cross-correlation of one of the station pairs from which the time delay was Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Institute for Oceanography; Atlantic Oceanographic Laboratories (U. S. ); Pacific Oceanographic Laboratories; United States. Environmental Science Services Administration. Research Laboratories. Washington, D. C. : U. S. Dept. of Commerce, Environmental Science Services Administration, Research Laboratories : For sale by the Supt. of Docs. , U. S. G. P. O.
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