No Quake Deeper Than 700 km

Earthquakes occur at different depth, ranging from just a few kilometers to 700 kilometers down. Why this is the case, nobody knows, but the absence of quakes any deeper than 700 kilometers may indicate that our planet is indeed hollow.

However, there is a problem with the numbers as seen from the hollow Earth perspective. The crust of our planet should be no more than 470 km thick. This means that matter must either have been added to our planet as part of the expansion process, or the quake data is somehow wrongly interpreted.

One way the quake data can be wrongly interpreted is if assumptions of densities in the crust are incorrect. A solid model predicts higher densities in the crust than a hollow model. It may therefore be the case that quakes that are presumed to happen 700 km down are in fact happening closer to the surface.

Cross section of a hollow planet