High-frequency recording of volcanic gas emission rates using dual UV-camera systems.
It allows remote imaging of SO2 column amounts in a volcanic gas plume at high frequency (up to 25 Hz), as well as simultaneous determination of the plume (wind) speed. SO2 fluxes are then accurately (+/-10-15%) obtained by scaling the integrated column amounts of SO2 in plume cross-section to the plume speed. Simultaneously operating OP-FTIR spectroscopy and dual UV-cameras will allow us to quantify short-term source variations in the emission rate of each gas species and the total gas discharge. Such parameters then allow to determine the amount of erupting magma, and to characterize the initial conditions of volcanic plume emission.