# Translations:Dictionary:Summation method/1/en

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{{#category_index:S|summation method}} A method of calculating weathering corrections to seismic arrival times. For adjacent interlocked split-dip profiles with sources just below the low-velocity layer, the correction for each group is half the sum of the first-arrival times at that group from the two interlocking records minus the average high-velocity time between the source points (obtained by subtracting the uphole time from the first-arrival time of the group at one of the source points when the source is fired at the other source point). See Figure S-22.