ArticleNature communications2025
Decadal change of seismic structure in the Earth's lowermost mantle.
Article in Nature communications, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- Decadal change of seismic structure in the Earth's lowermost mantle.Nature communications · 2025Article
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2 authors.
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Abstract
Studying temporal changes of seismic property could provide a direct mean to monitor dynamic processes in the Earth's lowermost mantle, yet no related seismic observations were discovered. Here, we report temporal changes of seismic data between a pair of nearly co-located earthquakes occurring on 2000/07/07 and 2009/12/17 and infer two types of decadal-scale structural changes in the lowermost mantle: (1) a 10s km-scale shrinkage or movement of an ultra-low velocity zone near the core-mantle boundary, and (2) opposing shear wave anisotropy changes in the top and bottom portions of the lowermost ~300 km mantle. These findings suggest that ultra-low velocity zones are deformed as partially molten materials or moved by vigorous localized material flows and the region of the lowermost mantle possesses a separate layer circulation. This report demonstrates the capability of seismic monitoring of deep mantle dynamics and calls for new geodynamical models to account for these previously unrecognized features.
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