In their paper, the authors discuss the results of an experiment which was set up to evaluate the respective merits of two types of air gun arrays in sub-basalt exploration where energic low frequency output is required to minimize scattering from rough sub-surface geometries and to 'shoot across' stacked, highly reflective layers. One of the arrays was a classical, tuned air-gun array, the output centred on the primary pulses. The second one, of the authors' design, centred the array's output on the first 'bubble pulse' (bubble tuning) by introducing delays in the guns' firing sequence, in order to enhance the source's low frequency character.
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