Investigating power variation in first breaks, reflections, and ground roll from different charge sizes

Christopher C. Petten and Gary F. Margrave


We investigate variation in power from different charge sizes in first breaks, reflections, and ground roll components of a shot record. To observe power distributions, shot data from four different charge sizes obtained in the Hussar low frequency experiment, conducted by CREWES, were analyzed using MATLAB. The first breaks, reflections, and ground roll were isolated using time windows defined by straight lines in x-t space. Upon defining the windows, the power in each window of the shot record was calculated by summing the squares of the samples in each window. Power was observed to increase quasi-linearly with charge size with the majority of power being present in the ground roll. Future work will include calculating the power in the F-K domain and conducting more charge-size tests in the field.

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