A record-breaking deep earthquake registered in May 2015 offshore of Japan likely was not a tectonic event but triggered by a ...

To find out, the team used whole-Earth oscillation data from 104 past earthquakes to create a detailed 3D model of the upper ...

A re-examination of the 2015 Bonin Islands earthquake disproved earlier claims of a record-breaking deep aftershock in the ...

Over millions of years, as rocky material descends through the boundary between the upper and lower mantle, mineral crystals are compressed and reformed into tinier grains that then regrow over time.

“We think that the anomalies in the lower mantle have a variety of origins,” says Schouten. “It could be either ancient, silica-rich material that has been there since the formation of the ...

A computer model visualization of material in the lower mantle. This material resembles a sunken plate but cannot come from subducted plates because of the lack of nearby subduction zones.

Based on previous geodynamic simulations and seismological results, the researchers inferred that the N-S FVDs at depths of 700–900 km reflect the remnant Pacific lower mantle flow field at ...

The magnitude 7.9 Bonin Islands earthquake sequence in May 2015, which ruptured deep within the earth near the base of the upper mantle, did not include an aftershock that extended to record depths ...

Geophysicists find areas that resemble the results of tectonic plate collisions — far from any area of such activity.

More information: Thomas L. A. Schouten et al, Full-waveform inversion reveals diverse origins of lower mantle positive wave speed anomalies, Scientific Reports (2024). DOI: 10.1038/s41598-024-77399-2 ...

Research on hidden structures deep within Earth’s mantle challenges theories about our planet’s middle layer and could ...