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地球内核并非完全固态

2025-02-11 11:51 by 月海沉船

地球内核位于地表下约 4800 公里处,被重力固定在液态外核之中。长期以来,科学界普遍认为内核是一个固体球体。南加州大学科学家的原始研究目标是进一步描绘内核减速的过程。“但当我分析几十年的地震记录时,发现其中一组地震波数据格外不同。”首席研究员 John Vidale 说。“后来,我意识到这正是内核并非完全固态的证据。”该研究利用地震波形数据,包括 1991 年至 2024 年间在南极洲南桑威奇群岛附近的 42 个监测点记录的 121 次重复地震,以窥探地球内核的活动情况。研究人员分析了位于阿拉斯加费尔班克斯和加拿大黄刀镇的地震接收阵列站的数据,发现黄刀镇站点的一组地震波表现出前所未见的特性。内核的额外物理活动可解释为内核形态的时间变化。研究结果表明,内核近表面可能发生黏性变形,在内核的浅层边界处发生形态的变化和位移。最可能导致这一结构变化的原因是内核与外核之间的相互作用。

Eurekalert: 地球的内核并非完全固态
DOI 10.1038/s41561-025-01642-2

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地球内核并非完全固态

2025-02-11 11:51 by 月海沉船

地球内核位于地表下约 4800 公里处,被重力固定在液态外核之中。长期以来,科学界普遍认为内核是一个固体球体。南加州大学科学家的原始研究目标是进一步描绘内核减速的过程。“但当我分析几十年的地震记录时,发现其中一组地震波数据格外不同。”首席研究员 John Vidale 说。“后来,我意识到这正是内核并非完全固态的证据。”该研究利用地震波形数据,包括 1991 年至 2024 年间在南极洲南桑威奇群岛附近的 42 个监测点记录的 121 次重复地震,以窥探地球内核的活动情况。研究人员分析了位于阿拉斯加费尔班克斯和加拿大黄刀镇的地震接收阵列站的数据,发现黄刀镇站点的一组地震波表现出前所未见的特性。内核的额外物理活动可解释为内核形态的时间变化。研究结果表明,内核近表面可能发生黏性变形,在内核的浅层边界处发生形态的变化和位移。最可能导致这一结构变化的原因是内核与外核之间的相互作用。

Eurekalert: 地球的内核并非完全固态
DOI 10.1038/s41561-025-01642-2

#科学

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