I would bet you lots of money that this is due to material failure. Most likely manufacturing issue, like the Sioux event.
Agree.
Located at or very close to that that separation point is a shaft coupling (fan to LPT shaft) and a bearing structure. I think the conical fractured piece in the Ave Herald photo is part of the bearing support or seal system.
Without specific knowledge or a GP7000 IPC to view we are guessing at best.
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Not much money to bet but do see a grounding coming.
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