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Large silicic magma reservoirs grow incrementally over 10,000–100,000 years. However, the accumulation and destabilization of eruptible rhyolite can occur in only months to centuries. Explosive rhyolite eruptions are a significant hazard. However, their rarity limits the opportunity to link geophysical monitoring signals to precursory magmatic processes. Consequently, petrologic reconstructions provide essential context for interpreting unrest at active silicic systems. I apply coupled compositional and temporal information at two rhyolitic systems to interrogate the magmatic processes that build shallow magma systems, the dynamics that precede rhyolitic eruptions, and link petrologic and geophysical observations.