The weighweight distribution of earth is not very symmetric at all, especially when taking the polar ice caps and the core mantle into account. There are 2 huge mantle blobs known as Large Low-Velocity Provinces (LLVP). They are located at:
- 1st blob is located beneath the Pacific Ocean.
- 2nd blob is located under the African continent.
- Both are twice the size of our moon.
Therefore it is highly likely that earth has flipped several times due to this instability. There are several Youtube videos on explaining this in detail. In addition there are many anthropological and archeological indications that that has happened many times in earths history. (I'm not going to list any of those references here,as they are readily available in large quantities a google search away.
It should also be clear that the inner core rotates (mostly) separately from the outer core and mantle ([2]). In addition it has been recently discovered that the inner core rotation have slowed down ([3]). Because of the fluidity and dynamics in rotation period of inner,vs surface, modelling a flip would be both very difficult and likely yield inaccurate results in terms of time-frame/duration of such an event.
However, both ancient texts and geological features seem to indicate that the surface effects of such a flip could happen in a very short period of 1-5 days, with catastrophic and/or near-distinctionextinction level type of global floods and tsunamis. The oceans would be relatively sloshing around to adjust to crustal movements.
Reference:
- https://en.wikipedia.org/wiki/Large_low-shear-velocity_provinces
[1]Cottaar; Lekic (2016). “Morphology of lower mantle structures”.
Geophysical Journal International. 207 (2): 1122–1136 (image)[2]https://en.wikipedia.org/wiki/Inner_core_super-rotation[3]https://phys.org/news/2024-06-rotation-earth-core.html