Abstract
Some problems in the interpretation of core phases and their precursor have been studied by the analysis of PKP phases, recorded at the NORSAR array. A limited number of SKP phases has been used as an aid in the analysis. Processing techniques, suitable for the resolution of core phases in slowness and time are discussed, in particular the usefulness and limitations of the Vespa process for this purpose. In the various techniques the effect of the structure under the array should be taken into account. The methods used reveal the refractions and reflections at the inner core boundary and also to some extent the more complicated character of the PKP precursor. Several representative examples of interpretation of the precursors are viewed in the light of the observational results. The analysis is limited to Δ > 136°. In this range the results indicate that diffraction effects may play a more important role in the generation of the precursors than is generally assumed.
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