Require only one pick per station of a specified phase.
OnePerSta(twpx, phase = "Y")
character, specific phase
This is used to reduce the number of picks for specific station and phase. The purpose is avoid multiple P-wave phases for each station in the earthquake location routines.
For S-waves there may be multiple S-wave arrivals, as in the case for shear wave splitting. In that case it is probably best to name the phases differently, as in S1, S2, for example.
Jonathan M. Lees<email@example.com>
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