Bani Philipson, Harris A. J. L., Shinohara H., Donnadieu F. (2013). Magma dynamics feeding Yasur's explosive activity observed using thermal infrared remote sensing. Geophysical Research Letters, 40 (15), p. 3830-3835. ISSN 0094-8276.
Titre du document
Magma dynamics feeding Yasur's explosive activity observed using thermal infrared remote sensing
Bani Philipson, Harris A. J. L., Shinohara H., Donnadieu F.
Source
Geophysical Research Letters, 2013,
40 (15), p. 3830-3835 ISSN 0094-8276
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 2h 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 14kJ and high-energy events with typical thermal energies of 97kJ. Around 180 low-energy events were recorded, which together released 457kJ of radiant energy. In contrast, only 20 high-energy events were recorded, but they released 2042kJ. 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.