Abstract
We have designed, built, and tested a new Multi-GAS instrument which includes a CH4 sensor, along with CO2, H2O, and H2S sensors. We conducted laboratory-based experiments to calibrate the sensors, analyze possible cross-interferences among sensors, and evaluate the quality of the measurements. The results of these experiments demonstrate high-quality measurements with each sensor, with no cross-interferences and accurate and precise CO2/CH4 concentration ratios. These promising results from the laboratory experiments were validated with field measurements. We tested the new Multi-GAS instrument at four different sites on the flanks of Rincón de la Vieja and Miravalles volcanoes in Costa Rica. At each site, direct samples were also collected to compare these results to the Multi-GAS measurements. The results from direct sampling and Multi-GAS showed excellent agreement. These field tests confirmed that this Multi-GAS instrument has the potential to shed new light upon the dynamic interactions of magmatic systems with hydrothermal systems and therefore could help forecast phreatic and other types of volcanic eruptions.
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