The areas of present volcanic and earthquake activity, when compared to their configuration at the time of the proposed original impact, suggested by the hole in the Indian plate, show what I believe to be the pattern of the expansion of the planet surface.

The main characteristic of this movement is the expansion of the Pacific Ocean as it is pushed outwards opposite the point of original impact and entry. This first expansion ( to the continental shelves ) appears to be caused by displacement.

I would speculate that the hole is the result of an event which injects the core of iron into the embryonic shell which is the original shields. I don't believe this event is the impact of a Mars sized planet which threw out the moon, as is now widely believed ( see 'Beta Pictoris' ).

To see the role that this collision plays in the proposed life cycle of an Earth on this website, see this section through to ‘Object in the Interior’ and ‘Mercury’.