Inner Core Rotation Captured by Earthquake Doublets and Twin Stations
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 Kyrgy...
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| Format: | Article |
| Language: | English |
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Wiley
2022-06-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2022GL098393 |
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| author | Yi Yang Xiaodong Song |
| author_facet | Yi Yang Xiaodong Song |
| author_sort | Yi Yang |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-07f12ef35cc74f44ab37432ca2d4edfc |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2022-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-07f12ef35cc74f44ab37432ca2d4edfc2025-01-22T14:38:16ZengWileyGeophysical Research Letters0094-82761944-80072022-06-014912n/an/a10.1029/2022GL098393Inner Core Rotation Captured by Earthquake Doublets and Twin StationsYi Yang0Xiaodong Song1Institute of Theoretical and Applied Geophysics School of Earth and Space Sciences Peking University Beijing ChinaInstitute of Theoretical and Applied Geophysics School of Earth and Space Sciences Peking University Beijing ChinaAbstract 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.https://doi.org/10.1029/2022GL098393inner coredifferential rotaionwaveform doubletstwin stations |
| spellingShingle | Yi Yang Xiaodong Song Inner Core Rotation Captured by Earthquake Doublets and Twin Stations Geophysical Research Letters inner core differential rotaion waveform doublets twin stations |
| title | Inner Core Rotation Captured by Earthquake Doublets and Twin Stations |
| title_full | Inner Core Rotation Captured by Earthquake Doublets and Twin Stations |
| title_fullStr | Inner Core Rotation Captured by Earthquake Doublets and Twin Stations |
| title_full_unstemmed | Inner Core Rotation Captured by Earthquake Doublets and Twin Stations |
| title_short | Inner Core Rotation Captured by Earthquake Doublets and Twin Stations |
| title_sort | inner core rotation captured by earthquake doublets and twin stations |
| topic | inner core differential rotaion waveform doublets twin stations |
| url | https://doi.org/10.1029/2022GL098393 |
| work_keys_str_mv | AT yiyang innercorerotationcapturedbyearthquakedoubletsandtwinstations AT xiaodongsong innercorerotationcapturedbyearthquakedoubletsandtwinstations |