Seismic waves uncover core mystery
A new study has revealed that Earth's outer core is more complex and dynamic than previously thought. Analyses of seismic waves show that heterogeneous materials move within it. Researchers used data from underground nuclear tests in France between 1977 and 1995 to compare how waves travel through the Earth's interior. They found that wave speeds have changed significantly over the decades, indicating the presence of an anomalous region extending over 700 kilometers in the South Pacific. These findings support the hypothesis that the outer core is not a solid mass of molten metals, but rather involves active movements and mixing. This could have implications for our understanding of Earth's magnetic field formation and its variations.
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