Dictionary:Pick

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1. To select an event on a seismic record, as to ‘‘pick’’ reflection events. 2. An event or time on an event that has been selected. The arrival of an event signifying new energy should cause an increase in amplitude and should affect different channels in a systematic coherent way. Various statistical tests are used to make picking decisions, ranging from simple summing along possible coherent patterns to schemes like semblance criteria. Some criteria search only for phase coherence, others look at the amplitude buildup, integrate over several half cycles, equalize spectral variations, etc. Grading is intimately related to picking. See also tracking.