Seismic travel‐time tomography, a common method for studying the Earth’s three‐dimensional seismic velocity variations, relies on robust measurement of seismic phase arrival times. Absolute arrival times are estimated by visually picking the emergence of the seismic phase of interest on seismograms. Subtracting theoretical arrival times (calculated using a known source location and origin time) from these picked absolute times yields absolute delay times. A widely used method whereby careful picking of absolute arrival times is not required is multi‐channel cross‐correlation (MCCC), developed by VanDecar and Crosson (1990). In MCCC, phase arrival times relative to an unknown average time are...
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