Shear softening of earth's inner core as indicated by its high poisson ratio and elastic anisotropy
Earth's inner core exhibits an unusually high Poisson ratio and noticeable elastic anisotropy. The mechanisms responsible for these features are crucial to understanding the nature of Earth's core. Although different mechanisms have been proposed, few can explain both observations simultan...
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KeAi Communications Co. Ltd.
2025-01-01
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| Series: | Fundamental Research |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S266732582200351X |
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| author | Zhongqing Wu Wenzhong Wang |
| author_facet | Zhongqing Wu Wenzhong Wang |
| author_sort | Zhongqing Wu |
| collection | DOAJ |
| description | Earth's inner core exhibits an unusually high Poisson ratio and noticeable elastic anisotropy. The mechanisms responsible for these features are crucial to understanding the nature of Earth's core. Although different mechanisms have been proposed, few can explain both observations simultaneously. The results of this study indicated that the crystal with noticeable shear softening would have strong anisotropy and an exceptionally high Poisson ratio simultaneously. Body-centered-cubic (bcc) iron exhibits shear instability at inner-core pressures and can be dynamically stabilized by high temperature and the presence of light elements. The bcc-lattice iron alloy could have strong anisotropy and a Poisson ratio of Earth's inner core before shear instability. Identifying which light elements can stabilize the bcc-lattice iron alloy will provide an independent constraint on the chemical composition of the inner core. |
| format | Article |
| id | doaj-art-06c03c3b60a34e9f81aece62dc8246c1 |
| institution | Kabale University |
| issn | 2667-3258 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | KeAi Communications Co. Ltd. |
| record_format | Article |
| series | Fundamental Research |
| spelling | doaj-art-06c03c3b60a34e9f81aece62dc8246c12025-01-29T05:02:27ZengKeAi Communications Co. Ltd.Fundamental Research2667-32582025-01-0151264268Shear softening of earth's inner core as indicated by its high poisson ratio and elastic anisotropyZhongqing Wu0Wenzhong Wang1Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China; Mengcheng National Geophysical Observatory, University of Science and Technology of China, Hefei 230026, China; CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei 230026, China; Corresponding author.Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Science, University of Science and Technology of China, Hefei 230026, ChinaEarth's inner core exhibits an unusually high Poisson ratio and noticeable elastic anisotropy. The mechanisms responsible for these features are crucial to understanding the nature of Earth's core. Although different mechanisms have been proposed, few can explain both observations simultaneously. The results of this study indicated that the crystal with noticeable shear softening would have strong anisotropy and an exceptionally high Poisson ratio simultaneously. Body-centered-cubic (bcc) iron exhibits shear instability at inner-core pressures and can be dynamically stabilized by high temperature and the presence of light elements. The bcc-lattice iron alloy could have strong anisotropy and a Poisson ratio of Earth's inner core before shear instability. Identifying which light elements can stabilize the bcc-lattice iron alloy will provide an independent constraint on the chemical composition of the inner core.http://www.sciencedirect.com/science/article/pii/S266732582200351XElasticityCrystal structureIron alloyEarth’s interiorComposition |
| spellingShingle | Zhongqing Wu Wenzhong Wang Shear softening of earth's inner core as indicated by its high poisson ratio and elastic anisotropy Fundamental Research Elasticity Crystal structure Iron alloy Earth’s interior Composition |
| title | Shear softening of earth's inner core as indicated by its high poisson ratio and elastic anisotropy |
| title_full | Shear softening of earth's inner core as indicated by its high poisson ratio and elastic anisotropy |
| title_fullStr | Shear softening of earth's inner core as indicated by its high poisson ratio and elastic anisotropy |
| title_full_unstemmed | Shear softening of earth's inner core as indicated by its high poisson ratio and elastic anisotropy |
| title_short | Shear softening of earth's inner core as indicated by its high poisson ratio and elastic anisotropy |
| title_sort | shear softening of earth s inner core as indicated by its high poisson ratio and elastic anisotropy |
| topic | Elasticity Crystal structure Iron alloy Earth’s interior Composition |
| url | http://www.sciencedirect.com/science/article/pii/S266732582200351X |
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