Does the internal mantle structure provide the resonance for the Chandler wobble of the Earth's axis or is it some other external…

Does the internal mantle structure provide the resonance for the Chandler wobble of the Earth's axis or is it some other external mechanism? No available motions seem to be coherent drivers for the wobble period of 433 days.

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Source: List of unsolved problems in geoscience (CC BY-SA 4.0)