Resurgent Toba—field, chronologic, and model constraints on time scales and mechanisms of resurgence at large calderas
نویسندگان
چکیده
Highlights • New data reveal for the first time a history of the last ∼33.7 ky of uplift of Samosir. • Minimum uplift rates were high (4.9 cm/year) for the first 11.2 ky but diminished after that to <1 cm/year for the last 22.5 ky. • Numerical modeling suggests that rebound of remnant magma augmented by deep recharge appears to be the most likely driver for uplift. • Detumescence makes a negligible contribution to resurgent uplift. • The volume of the resurgent dome is isostatically compensated by magma • Average rates of uplift at Toba are much lower than currently restless calderas indicating a distinction between resurgence and “restlessness”.
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