在内核边界的内核边界处的小规模分层结构
Baolong Zhang1,2, Sidao Ni3, Wenbo Wu4
1State Key Laboratory of Geodesy and Earth's Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430077, China.
Nature communications
|October 11, 2023
概括
地震数据揭示了地球上的变化.
科学领域:
- 固体地球地质物理学 地质物理学
- 地震学 地震学
- 地球的内部深处是地球的内部深处.
背景情况:
- 地球的内核边界 (ICB) 对于理解核心动态和演变至关重要.
- 在ICB的地震波相互作用为热,化学和地力学过程提供了洞察力.
- 之前的研究已经探讨了ICB属性,但微型结构仍然是一个活跃的研究领域.
研究的目的:
- 为了限制地球内核边界 (ICB) 的细结构.
- 研究源复杂性,地幔异常和ICB特性对地震波形的影响.
- 探索观察到的ICB结构变化的潜在解释.
主要方法:
- 利用PKiKP前临界地震波形的数据集.
- 应用先进的建模技术来分析波形数据.
- 将源复杂性和地幔结构等因素纳入分析.
主要成果:
- 在蒙古和东北亚下方发现了一个尖的ICB结构.
- 在中亚,西伯利亚和东北亚部分地区检测到局部层层的ICB结构.
- 复杂的ICB结构可能归因于柔软的区域或共存的铁相 (bcc和hcp).
结论:
- 在地球内核边界 (ICB) 存在显著的横向变化.
- 这些变化表明外部和内部核心之间存在复杂的热化学和地力学相互作用.
- 在ICB的树生长过程可能表现出相当大的横向异质性.
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