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Article Dans Une Revue Geophysical Research Letters Année : 2013

Magma dynamics feeding Yasur's explosive activity observed using thermal infrared remote sensing

Résumé

A thermal infrared thermometer was used to record the passage of hot gases and fragments across a measurement area located at the exit of one of Yasur's active vents. Recording was completed over 2 h during September 2011. A total of 200 explosive events were recorded. We define two types of event: low-energy events with typical thermal energies of 14 kJ and high-energy events with typical thermal energies of 97 kJ. Around 180 low-energy events were recorded, which together released 457 kJ of radiant energy. In contrast, only 20 high-energy events were recorded, but they released 2042 kJ. We suggest that low-energy events originate from a relatively shallow, degassed magma reservoir and are associated with bursting of bubbles formed by bubble coalescence during ascent. Instead, high-energy events originate from a relatively deep, fresh magma reservoir and are associated with slugs formed by foam collapse.
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hal-01067169 , version 1 (12-11-2021)

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Philipson Bani, Andrew J.L. J.L. Harris, Hiroshi Shinohara, Franck Donnadieu. Magma dynamics feeding Yasur's explosive activity observed using thermal infrared remote sensing. Geophysical Research Letters, 2013, 40, pp.3830-3835. ⟨10.1002/grl.50722⟩. ⟨hal-01067169⟩
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