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Cited by 11High-pressure geophysics and materialsSeismic Waves and Analysisearthquake and tectonic studies

Inner Core Rotation Captured by Earthquake Doublets and Twin Stations

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Yang, Yi, Song, Xiaodong·2022·Geophysical Research Letters
DOI 10.1029/2022gl098393
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Abstract

The Earth's solid inner core (IC) is generally believed to rotate relative to the mantle, but the proposal remains controversial. Here we use seven waveform doublets in the South Sandwich Islands region with time lapses of 5.8–17.0 years that are recorded by two close stations in Kyrgyzstan with virtually the same epicentral distance. The fortuitous geometry allows precise measurements of the IC temporal changes and the underlying local structure at the same time. The remarkable observations in waveforms and spatial‐temporal measurements show unequivocally that the IC must have shifted (rotated) eastward in 1991–2010 and help determine accurately the average rotation rate as 0.127 ± 0.006°/yr at 95% confidence level during the time span.

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  • The average eastward rotation rate of about 0.10°/yr between the 1980s and 2000s is compatible with previous low estimates, including 0.07-0.15°/yr for 1971-1974 and 0.12°/yr between 1991 and 2010.

    “which is compatible with the previous low estimates, including 0.07-0.15°/yrfor the time-period of 1971-1974 from IC scattering waves (Vidale, 2019;Vidale et al., 2000;Wang & Vidale, 2022a) and 0.12°/yr between 1991 and 2010 from earthquake doublets and twin stations (Yang & Song, 2022).”

    From Pattern of Inner‐Core Differential Rotation From Long‐Term Earthquake Sequences and USArray Network (2026) · cites this paper as Yang & Song, 2022

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Cited by

Sorted by citations

Authors
Yang, Y., & Song, X.
Affiliations
Peking University (CN)
Corresponding author
Song, Xiaodong
ORCID
Venue
Geophysical Research Letters
Publisher
American Geophysical Union (AGU)
Published
2022-06-23
Volume
49
Issue
12
ISSN
  • 0094-8276 (ISSN-L)
  • 1944-8007
DOI
10.1029/2022gl098393
OpenAlex
W3200228301
Cited by
11
References
1
Citations by year
2026: 3 · 2024: 4 · 2023: 4
FWCI
1.16
Type
journal article
Language
en
Open access
Licence
Locations
  • Geophysical Research Letters (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • National Natural Science Foundation of China (42104096, U1939204)
  • China Postdoctoral Science Foundation (2021M690203)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Seismic Waves and Analysis
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › earthquake and tectonic studies
Keywords
inner core rotation, solid inner core, inner core structure, seismic waveform analysis

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