By stacking waveforms from global seismic stations, we observe up to fivefold reverberating waves from selected earthquakes along Earth's diameter. These waves provide new insights into the Earth's inner core, revealing a ~650-km thick innermost ball with P-wave speeds ~4% slower at ~50° from the Earth's rotation axis, contrasting with the outer shell's weaker anisotropy. This strengthens evidence for an anisotropically distinctive innermost inner core, potentially a record of a past global event.
Publisher
Nature Communications
Published On
Feb 21, 2023
Authors
Thanh-Son Phạm, Hrvoje Tkalčić
Tags
Earth's inner core
reverberating waves
seismic stations
P-wave speeds
anisotropy
global event
earthquakes
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