Fig. 5: Observations of second and fourth PKIKP multiples, i.e., PKIKP2 and PKIKP4, respectively, in the seismic wavefield from the 30 Nov 2018, Mw 7.1 Anchorage earthquake. | Nature Communications

Fig. 5: Observations of second and fourth PKIKP multiples, i.e., PKIKP2 and PKIKP4, respectively, in the seismic wavefield from the 30 Nov 2018, Mw 7.1 Anchorage earthquake.

From: Up-to-fivefold reverberating waves through the Earth’s center and distinctly anisotropic innermost inner core

Fig. 5

A Seismic records from the Alaskan network are aligned with the predictions of PKIKP2 arrivals, corrected by the Earth’s ellipticity69. The waveforms are bandpass filtered in the period band of 7–13 s. C Linear stack of individual waveforms. E The spectrograms of stacked waveforms before filtering show the frequency content variation as a function of time. (B, D, F) Similar to (A), (C), and (E) but for the PKIKP4 arrivals.

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