Monitoring Gas Emissions from Volcanoes to Predict Volcanic Activity

Geological, Geophysics, Environmental & Geotechical Engineering

Date posted: 04/27/17

To understand and predict the behavior of volcanoes an increasing number of scientists are combining geological monitoring and geochemical models. By measuring and monitoring the prevalence of gases like CO2, scientists hope to be able to better predict the likelihood of volcanic eruptions. In 2010 Iceland Eyjafjallajokull volcano erupted, releasing 250 million cubic meters of ash into the atmosphere. The eruption disrupted 100,000 flights and 10 million journeys, bringing the global aviation industry to a standstill and costing hundreds of millions of dollars. In the past predicting when one of the world 1,500 volcanoes is about to erupt has been based on monitoring and measuring the seismic activity around the site. However, since the 1970s correlation spectrometers have been used to measure the levels of sulfur dioxide in the volcanic plume as scientists began to understand that higher levels of gas emission from a volcanic site indicates a higher chance of eruption. In more recent times, using geochemical models, a growing body of research and evidence shows measuring the levels of emitted CO2 can be used to predict the risk of an eruption. When magma begins to rise to the surface its pressure decreases, releasing gases into the environment. This process, known as degassing, releases volatiles into the air, including water (H2O), carbon dioxide (CO2) sulfur dioxide (SO2) and hydrogen sulfide (H2S). These gases escape through fumaroles, appearing as plumes of smoke. Scientists have discovered that by studying the composition of this gaseous mixture and monitoring fluctuations in their composition, they may be better able to predict the likelihood of volcanic eruption. Between 2007 and 2012 Italian scientists at the Stomboli Volcano used fixed cameras, a Multi-GAS analyzer (to monitor SO2 and CO2 fluxes) and continual fumerole temperature recording to monitor geological and geochemical variations at the site.