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

Abstract : 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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https://hal.archives-ouvertes.fr/hal-01067169
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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, American Geophysical Union, 2013, 40, pp.3830-3835. ⟨10.1002/grl.50722⟩. ⟨hal-01067169⟩

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