The amplitude spectral ratio of PKPdf and PKPbc phases recorded at Polish stations from some strong deep Kermadec/Fiji earthquakes is used to derive the attenuation at the top of the inner core. The derived mean value of QP is 314±46 (95% confidence level) and the maximum depth of penetration of the PKPdf phase into the inner core is roughly 341 km. The sampled region of the inner core is centered beneath the Kuril Islands and North East of Japan.

Inner core attenuation observed at Polish broadband stations

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