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How that happens so fast is unclear.","posed_since":"","precise":"Explain the rapid remobilization of crystal mush (crystal fraction above about 0.5) into eruptible magma on timescales of $10^{0}\\ \\text{to}\\ 10^{2}\\,\\mathrm{yr}$ inferred from diffusion chronometry, distinguishing reheating by recharge, melt segregation by compaction or reactive flow, and gas sparging. An answer is a mechanism whose predicted timescale and volume match petrologic records of large eruptions.","problem_ref":null,"references":"","settled_by":"Multiphase reservoir simulations, with measured mush rheology, that reproduce remobilization times and volumes inferred from crystal chronometry.","status_note":"","title":"How do locked crystal mushes become eruptible within 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