Extended Data Fig. 2: Example ICS observations in categories 1–3.
From: Enhanced inner core fine-scale heterogeneity towards Earth’s centre
All three earthquakes were recorded in Chiang Mai, Thailand (CMAR) and had similar magnitudes (Mw ~6.3). The blue-dashed lines mark the predicted PKiKP arrival time and the red dashed lines mark the theoretical PKiKP slowness. Rows a through c (back azimuth, slowness, and beam amplitude) show the results from the sliding window slowness analysis, presented as a function of time relative to earthquake origin time. Row d shows envelopes of delay-and-sum beams formed at the theoretical PKiKP slowness. The red line is the best fitting curve to the background energy using the quasi-analytical coda decay model (Eq. (1)). Row e shows the denoised PKiKP envelopes as a function of time relative to PKiKP.
