Figure 5

Radon‒CO₂ fluxes correlation for FLFF (in blue) and SBHS (in red). Only fluxes measured after the 2015 Gorkha earthquake are considered at SBHS. Diamond shows the data-set, dashed curve represents the average of the data, and solid curve is the calculation of the advective–diffusive radon transport model separately for each site using the depth of degassing constrained by an unbiased approach with 500 simulations (see “Methods” section). The bottom right inset represents the normalized χ² coefficient as a function of the depth of the radon source, constraining the depth of CO₂ degassing separately for each site (369 m for SBHS and 2632 m for FLFF). Model parameters are summarised in Table 3.