Background

Soil CO₂ measurements provide insights into diffuse volcanic degassing that does not manifest as visible plumes. These measurements capture CO₂ released through soils and fractures, offering a complementary perspective to plume-based methods such as MultiGAS or DOAS.

At Okmok volcano, soil CO₂ is of particular importance because diffuse degassing occurs across the caldera floor rather than solely from discrete vents. Monitoring soil gas concentrations helps constrain the total carbon budget of the system and track temporal variations associated with magmatic processes.