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Observations of PKiKP at distances less than 110°

SEISMOLOGY DIVISION, EARTH PHYSICS BRANCH DEPARTMENT OF ENERGY, MINES AND RESOURCES, OTTAWA, ONTARIO, Canada
INSTITUT DE PHYSIQUE DU GLOBE, 11, QUAI SAINT BERNARD, PARIS V^E, France

Abstract

PKiKP phases have been identified at the Yellowknife Array from one nuclear explosion at a distance of 44°, and 18 earthquakes over the distance range 70° to 100°. In addition, PKiKP phases from two nuclear events were observed at 8 single seismometer stations at distances between 21° and 43°. The measured travel times and slownesses agree satisfactorily with those calculated using recent core models. The observed amplitudes are also close to the predicted values when compared with PKiKP amplitudes determined at LASA in Montana. Because of the large scatter of the observed PKiKP amplitudes and the complexities associated with the reflection of PcP, the amplitude ratio PKiKP/PcP does not readily yield detailed information on the inner core boundary.