从模型空间搜索中对内核异质性进行强大的正常模式约束
Caroline Beghein1, Jeannot Trampert
1Faculty of Earth Sciences, Utrecht University, Post Office Box 80021, 3508 TA Utrecht, Netherlands. beghein@geo.uu.nl
概括
地球内核中的地震波异质性揭示了不同的P波和S波模式. 这些发现表明内部核心中心的结构变化和潜在的新铁相.
科学领域:
- 地质物理学 地质物理学
- 地震学 地震学
- 地球科学 地球科学 地球科学
背景情况:
- 地球的内核表现出复杂的地震特性.
- 了解内核异构性对于地力学模型至关重要.
研究的目的:
- 为了研究地球内核的地震异构性.
- 用深度来描述P波和S波异构的行为.
主要方法:
- 在地震正常模式测量中应用了一种用于搜索全模型空间的新技术.
- 分析了异常分裂的正常模式,以确定异构性模式.
主要成果:
- 在内核中观察到一个强大的P波和S波异构的图案.
- 在大约400公里半径的P波异性异性参数变化信号.
- 在上部内核中,S波异性是最小的,在更深处变为负的.
结论:
- 结果与在很远的中心距离 (150-180度) 的旅行时间异常一致.
- 模型表明,在上部内核中逐渐倾斜的六角密封铁.
- 在内核的中心可能存在不同的铁相.
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