A warning system capable of detecting signs of an imminent volcanic eruption has been developed by British firm VolcanoTech, offering communities near active volcanoes a vital lifeline. Spun out from the University of Sheffield, their innovative technology is already being deployed in several countries.
The Pi-cam system detects sulphur dioxide, a gas released by rising magma before an eruption. Like carbon dioxide escaping from a fizzy drink when opened, magma emits dissolved sulphur dioxide as it ascends towards the surface. A significant increase in this gas can signal that a volcanic eruption is imminent, providing crucial time for evacuations and safety measures.
VolcanoTech's solution leverages readily available commercial technology to keep costs down. It uses a standard smartphone camera modified to perceive ultraviolet wavelengths, coupled with a simple Raspberry Pi processor to interpret the data. This setup allows the system to measure the fluorescence from sulphur dioxide; the more UV detected, the higher the concentration of the gas. The affordability of these individual units means that extensive networks of sensors can be established for a fraction of the price of comparable systems.
VolcanoTech's systems are currently operational in several highly volcanic regions, including Ecuador, Chile, Mexico, and Indonesia. Further installations are planned for Costa Rica and Argentina, expanding the reach of this vital early warning capability.
The development of large, low-cost sensor networks holds the potential to transform not only volcanic monitoring but also broader air quality surveillance. Instead of relying on scattered data points, future vulcanologists and meteorologists could benefit from a comprehensive, real-time picture of atmospheric changes, ultimately improving public safety and environmental management.