Multi-component gas analyzer system

A multi-component gas analyzer system (Multi-GAS) is an instrument package used to take real-time high-resolution measurements of volcanic gases.

[2][3] The system can be used for individual surveys or set up as permanent stations[1] connected to radio transmitters for transmission of data from remote locations.

[6] The development of this instrument has helped scientists to monitor real-time changes in volcanic gas composition, allowing for more rapid hazard mitigation and an enhanced understanding of volcano processes.

[9] The instruments are packaged in compact, portable, weather-resistant containers allowing for in situ measurements of various types of outgassing terrains.

Multi-GAS measurements of real-time CO2/SO2 ratios can allow detection of the pre-eruptive degassing of rising magmas, improving the prediction of volcanic activity.

[1] As magma rises beneath the surface CO2 solubility decreases and the gas readily exsolves, leading to an increase in the CO2/SO2 ratio.

In the Americas, Villarrica,[22] Masaya Volcano,[23] Mount St. Helens,[17] and Soufrière Hills[24] are also observed with instruments for changes in volcanic gas output.

Degassing activity increases after ground movement due to the opening of new paths (e.g. fractures) in the crust for the gas to flow.

A multi-component gas analyzer system is often one of many instruments used to measure gases and monitor volcanic activity.
Multi-GAS permanent field station. Set-up consists of a Multi-GAS, satellite terminal, 12V batteries, and solar panel control located inside the wooden box. Satellite antenna, solar panels, and multi-GAS intake/outtake located outside of the box.
Raw multi-GAS data showing the correlation between CO 2 and H 2 S. Fitting a linear regression line to raw data allows for the calculation of the CO 2 /H 2 S ratio for monitoring changes in the gas output of the system.