The core-mantle boundary (CMB) is crucial for the Earth's magnetic field and rotation. It is known that this boundary harbors complex structures, including ultralow velocity zones (ULVZs), characterized by significantly slowed seismic wave velocities.
Closer to Earth: A new technique for examining ultralow velocity zones at Earth's core-mantle boundaryThe core-mantle boundary is crucial for the Earth's magnetic field and rotation. It is known that this boundary harbors complex structures, including ultralow velocity zones , characterized by significantly slowed seismic wave velocities. The origin and structure of these zones are key to unraveling and understanding some secrets in related fields, especially the Earth's science.
The technique focused on analyzing the SKKKP seismic core phase—a specific pattern of wave propagation and reflection at the CMB. By conducting an in-depth analysis of SKKKP waves, researchers uncovered that the ULVZs are responsible for the unexpectedly large observable distances of these waves. Further explorations suggested that ULVZ formation might be linked to tectonic plate movement. As a subducting plate descends into the lower mantle, its, with a lower melting point, may separate from the underlying plate and sink to the CMB, potentially leading to partial melting and ULVZ creation.: Closer to Earth: A new technique for examining ultralow velocity zones at Earth's core-mantle boundary retrieved 1 April 2024 from https://phys.
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