J 7
J 7 : The symbol J is used to indicate that part of a ray path which has traversed the Earth's inner core as an S wave. Unambiguous observations of such waves have not yet been achieved, but they may be possible in future. For this and other such symbols used in seismic phase names see IS 2.1 in this Manual and Storchak et al. (2003 and 2011). jerk Rate of change of acceleration
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