2:45 PM - 3:00 PM
[STT40-05] An observation on volcanic gas composition using Multi-GAS onboard unoccupied aircraft systems
★Invited Papers
Keywords:Multi-GAS, Volcanic gas compositions, Unoccupied Aircraft Systems
The composition of volcanic gases reflects magma degassing and subsequent reactions in magmatic and hydrothermal systems. A measurement of their composition is essential to understand the supply system of volcanic gases and their fluctuations during volcanic unrest. A sampling of fumarolic gases has been applied to monitor variations in volcanic gas composition, but the target has been limited to accessible fumaroles. A recent development in the in-situ measurement of plume composition using multiple gas sensors (Multi-GAS: Shinohara, 2005, JVGR; Aiuppa et al., 2005, GRL) has extended the target to inaccessible fumaroles. A smaller and lighter Multi-GAS has been recently made with minimal gas sensors, batteries, and data loggers. It has been installed on unoccupied aircraft systems (UASs) and has operated at volcanoes with limited access to the craters or volcanoes that are inaccessible due to eruptions (Mori et al., 2016, EPS; Rüdiger et al., 2018, AMT; Stix et al., 2018, JGR; Liu et al., 2018, G-cubed).
In a Multi-GAS measurement, multiple sensors detect changes in the concentration of each gas component relative to the surrounding atmosphere. The composition is calculated by the concentration ratio of each component based on the correlation of the concentration changes. It is currently necessary to balance the payload of the UAS and the type and accuracy (signal-to-noise ratio) of the onboard gas sensors depending on the situation. In this study, we have made a prototype of Multi-GAS that can measure concentrations of the main components of volcanic gases comprehensively and accurately with a small UAS for industrial use (Morita and Mori, 2021, JpGU Meeting). The system was tested at Aso volcano in 2021 and measured plume compositions, including CO2, SO2, H2S, H2O, and H2 with s small industrial UAS (DJI Matrice 200 V2). The presentation will show improvements made since the first prototype was tested and the results of a flight test at Iwoyama volcano, Kirishima volcanic complex.
In a Multi-GAS measurement, multiple sensors detect changes in the concentration of each gas component relative to the surrounding atmosphere. The composition is calculated by the concentration ratio of each component based on the correlation of the concentration changes. It is currently necessary to balance the payload of the UAS and the type and accuracy (signal-to-noise ratio) of the onboard gas sensors depending on the situation. In this study, we have made a prototype of Multi-GAS that can measure concentrations of the main components of volcanic gases comprehensively and accurately with a small UAS for industrial use (Morita and Mori, 2021, JpGU Meeting). The system was tested at Aso volcano in 2021 and measured plume compositions, including CO2, SO2, H2S, H2O, and H2 with s small industrial UAS (DJI Matrice 200 V2). The presentation will show improvements made since the first prototype was tested and the results of a flight test at Iwoyama volcano, Kirishima volcanic complex.