Time shift between record sections

This plot shows the delayed arrival of phases recorded at hour 12 relative to hour 9. Regions of smooth color variation indicate areas of good correlation between the two record sections. The first 20 ms and the upper right half of the plot are areas of noise preceding and following the shot. These regions have no meaningful correlation. The most important feature of this plot is the clear correlation of both body waves and surface waves through time. Not only are the records highly repeatable, but important shifts in the data are visible. The surface waves at hour 12 are consistently delayed by several milliseconds. Similarly, the body waves are consistently delayed by up to 1.5

sampling at 1,2,3,... ms
6 ms window with 3 ms of taper of either end
Operating on 200-1000 Hz bandpass-filtered data

Same technique as plot above but using filtered data and timw windows more appropriate to high frequency body waves.