party_pants said:
West Africa and the Pacific are on opposite sides of the planet.
just saying
> Yuan and his colleagues were intrigued by two large blobs within Earth’s mantle, which sit below West Africa and the Pacific Ocean. The planet’s core is wedged in between these blobs. The blobs, formally known as large low-shear velocity provinces, were detected using seismic waves — these are the waves of energy that travel through Earth’s layers during an earthquake. As the waves passed through these blobs, they slowed down, suggesting to observing scientists that the blobs are much hotter and denser than the surrounding material.
> Scientists are not sure why these provinces formed that way. But previous evidence suggests they have existed since the time the Moon formed, billions of years ago. And according to the new hypothesis, these blobs may, in fact, be leftover remains of Theia
There would be three ways to attempt to determine the remains of Theia.
One, as they suggest, is to look to high density regions in the deep mantle using earthquakes.
A second is to measure the gravity anomaly of Earth to find the region of highest gravity (extrapolated down to the core boundary).
A third is to look at the current figure of the Earth, the altitude.
If the three methods agree then the result would be rock solid.