Abstract
Seismic scattering by inhomogeneities in the lower and upper mantle has recently been shown to account for observed precursors to the seismic phases PKIKP and PP. In the present paper the theoretical implications of these inhomogeneities in respect of scattering of P′P′ phases are examined and compared with detailed observational data obtained at the NORSAR seismic array. It is shown that observed P′P′ precursors having lead times up to about 50 sec before the main P′P′ phases are consistent with having the same scattering origins as precursors to PP and PKIKP. The scattering interpretation removes the need for postulating certain reflecting discontinuities in the upper mantle required by the PdP and P′dP′ hypotheses.
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