Fig. 1: Study region and an example of PKiKP and PcP observations.
From: Small-scale layered structures at the inner core boundary
a Seismic raypaths (blue for PcP and orange for PKiKP) along with great circle paths (green lines) connecting seismic stations (triangles) and events (stars, the information of events used in this study is shown in Supplementary Table 1). PcP and PKiKP reflection points are indicated with blue and orange circles on the core-mantle boundary (CMB) and inner core boundary (ICB), respectively. The blue triangles are small aperture dense arrays, the detailed array configurations of the Kurchatov-Cross Array (KURA), Karatau Array (KKA), and Borovoye Array (BVA) are shown in supplementary Fig. 2. b Comparison of PKiKP and PcP waveforms at 2.0 to 3.0 Hz at the KKA array for Event 1. Partial velocity seismograms of PcP (blue) and PKiKP (orange) observations are plotted with normalized amplitude, and the 11th trace is the stacked result. The time zero represents the travel time of the PKiKP and PcP phases.
