Characterization of moderate ash-and-gas explosions at Santiaguito volcano, Guatemala, from infrasound waveform inversion and thermal infrared measurements



De Angelis, S ORCID: 0000-0003-2636-3056, Lamb, OD ORCID: 0000-0002-2254-4258, Lamur, A ORCID: 0000-0002-9977-0085, Hornby, AJ ORCID: 0000-0002-4969-6163, von Aulock, FW, Chigna, G, Lavallee, Y ORCID: 0000-0003-4766-5758 and Rietbrock, A
(2016) Characterization of moderate ash-and-gas explosions at Santiaguito volcano, Guatemala, from infrasound waveform inversion and thermal infrared measurements. GEOPHYSICAL RESEARCH LETTERS, 43 (12). pp. 6220-6227.

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Abstract

The rapid discharge of gas and rock fragments during volcanic eruptions generates acoustic infrasound. Here we present results from the inversion of infrasound signals associated with small and moderate gas-and-ash explosions at Santiaguito volcano, Guatemala, to retrieve the time history of mass eruption rate at the vent. Acoustic waveform inversion is complemented by analyses of thermal infrared imagery to constrain the volume and rise dynamics of the eruption plume. Finally, we combine results from the two methods in order to assess the bulk density of the erupted mixture, constrain the timing of the transition from a momentum-driven jet to a buoyant plume, and to evaluate the relative volume fractions of ash and gas during the initial thrust phase. Our results demonstrate that eruptive plumes associated with small-to-moderate size explosions at Santiaguito only carry minor fractions of ash, suggesting that these events may not involve extensive magma fragmentation in the conduit.

Item Type: Article
Uncontrolled Keywords: Santiaguito, thermal infrared, volcano infrasound
Depositing User: Symplectic Admin
Date Deposited: 03 Nov 2016 11:57
Last Modified: 19 Jan 2023 07:26
DOI: 10.1002/2016GL069098
Open Access URL: http://onlinelibrary.wiley.com/doi/10.1002/2016GL0...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3004314