"Paste layer" found in local areas of The Earth's core boundary, such as the walrus

Recently, Professor Wen Lianxing of the Seismic and Geoseal physics laboratory of China University of Science and Technology used seismic observation data to find for the first time that the Earth's core boundary has a "paste layer" in the local area.
published the results online in Nature Communications, an internationally authoritative academic journal, and the first author of the paper was Tian Dongdong, a doctoral student in the research group.
magnetic field comes from the Earth's core, understanding the solidification state of the Earth's core is the key to understanding the origin of the Earth's magnetic field.
Since the 1980s, scientists have predicted that there may be three regions near the boundary of the Earth's core: the extraterriteral core in pure liquid form, the core of the Earth in pure solid form, and the intermediate region in solid liquid coexistence, the paste layer.
the presence of a paste layer is of revealing significance for understanding the solidification process of the Earth's core, but there has been no observational evidence in the scientific community.
Recently, by analyzing the walking times and waveforms of seismic waves reflected from the boundary of the Earth's core recorded by Hi-net, Japan's high-sensitivity seismic network, the team found that there was a paste layer about 4 to 8 kilometers thick at the earth's core boundary below the southwestern part of the Sea of Okhotsk, while other Earth core boundaries adjacent to the region showed a sharp interface and no paste layer existed.
the results provide direct evidence of the existence of the neuter boundary paste layer, and also show that the paste layer exists only in the local area of the Earth's core.
the results show that the driving force of the geomagnetic field changes with the region, and the outer core of the earth is close to the composition of the cocrystalline composition of iron and light elements, thus forming a sharp core interface without paste layer in most areas, while in some areas, the outer core of the earth deviates from the composition of the cocrystalline composition of iron and light elements, forming a local paste layer.
source: Xinhua News Agency.