Scanning tomography of SO2 distribution in a volcanic gas plume

Statistics – Computation

Scientific paper

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Volcanology: Remote Sensing Of Volcanoes, Volcanology: Volcanic Gases, Computational Geophysics: Data Presentation And Visualization, Volcanology: Volcano Monitoring (7280), Computational Geophysics: Data Analysis: Algorithms And Implementation

Scientific paper

Two-dimensional cross sections of the sulphur dioxide (SO2) distribution in the volcanic gas plume of Mt. Etna were reconstructed using tomographic techniques. The data for these projections were generated by a network of five automated scanning spectrometers, positioned on the flanks of the volcano. These measure slant-column amounts of SO2 at 105 different angles, every four minutes. Stable wind conditions allow the plume to be monitored on 82% of days. A time-series of plume cross sections was computed, revealing the potential of this method to track variations in plume position and structure on timescales of minutes to hours, a result of potential importance for air traffic and civil defence in case of eruption, when copious amounts of fine ash can be transported.

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